EV Digest 5225
Topics covered in this issue include:
1) Re: Portable Dyno Setup
by "Joe Smalley" <[EMAIL PROTECTED]>
2) Re: dc converter disconnect
by "Lawrence Rhodes" <[EMAIL PROTECTED]>
3) Re: Looking for suggestions for converting 6054 type headlights to HID
by Neon John <[EMAIL PROTECTED]>
4) The Names have been Changed to Protect the Innocent!
by John Wayland <[EMAIL PROTECTED]>
5) Re: GE EV2000 Controller
by "Lawrence Rhodes" <[EMAIL PROTECTED]>
6) Re: Charging outlet - what is common?
by "Joe Smalley" <[EMAIL PROTECTED]>
7) Transformer cores
by Justin Southam <[EMAIL PROTECTED]>
8) Re: Portable Dyno Setup
by Neon John <[EMAIL PROTECTED]>
9) Re: Transformer cores
by Danny Miller <[EMAIL PROTECTED]>
10) Re: Off-the-shelf multiple battery voltage display sought
by "Paul G." <[EMAIL PROTECTED]>
11) Re: Horsepower / Torque
by "Paul G." <[EMAIL PROTECTED]>
12) RE: Horsepower / Torque
by "Pestka, Dennis J" <[EMAIL PROTECTED]>
13) Re: The Names have been Changed to Protect the Innocent!
by Jim Husted <[EMAIL PROTECTED]>
--- Begin Message ---I was doing this technique in 1984 and 1985. The first machine I used for processing this type of data ran at a screaming 2 MHz. Joe Smalley Rural Kitsap County WA Fiesta 48 volts NEDRA 48 volt street conversion record holder [EMAIL PROTECTED] ----- Original Message ----- From: "Stefan T. Peters" <[EMAIL PROTECTED]> To: "Electric Vehicle Discussion List" <[email protected]> Sent: Wednesday, March 01, 2006 2:24 PM Subject: Portable Dyno Setup > This came up on the Datsun Roadster forums, and I thought it would be > kinda handy for those into performance EVs: > > http://www.charm.net/~mchaney/homedyno/homedyno.htm > > Now if someone could come up with a way to convert the signal from a > typical RPM sensor on an electric motor into an appropriate audio signal... > > DISCLAIMER: Just a crazy thought, maybe it's not worth the trouble? > > -- > > Stefan T. Peters >
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--- Begin Message --- This is just a safety step to keep the DC/DC from seeing the full pack voltage. Lawrence Rhodes........ ----- Original Message ----- From: "Bill & Nancy" <[EMAIL PROTECTED]>To: <[email protected]> Sent: Wednesday, March 01, 2006 12:52 PM Subject: Re: dc converter disconnectIs it best to disconnect the dc to dc when charging the pack? Does the repeated switching of power off and on harmful to the converter components?Thanks, Bill Lawrence Rhodes wrote:I have a Magnacraft relay that can easily cut out the DC/DC when charging. It could also do things like take out the precharge resistor. It just depends on how you want to design your system. There are many ways to do it. LR.........
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--- Begin Message ---yeah, significant experience. Enough to know that halogen lamps SUPPLIED WITH THE PROPER VOLTAGE are far superior except where power consumption is a very big concern. The problem is that few if any OEM wiring systems get the proper voltage to the lamps. AFIK, there are no DOT-approved aftermarket HID lights available. At least there weren't last time I did a survey at the end of summer. The market is hot for OEM projector HID lamps salvaged from wrecks but major fabrication is required to fit them to cars not originally designed for them. There are at least a couple of companies offering new projector luninaries that look suspiciously like OEM spare parts but they're expensive and not DOT approved as general purpose headlamps. Speaking of DOT, they're urging states to crack down on aftermarket HIDs because of the glare problem. I've read the letter the local cops received last year on this topic. The local cops are not being particularly chicken-sh*t about this but others may be. The letter urges any "bluish headlights" to be checked out via a traffic stop. Except for the listed OEMs, of course. The letter contains photos of common ballasts to help identify HIDs. If power consumption is a problem and DOT compliance isn't and preferably if you're operating off-road, you can buy aftermarket HIDs from places like this: http://www.trailtech.net/racelight.htm Those are NOT DOT approved and the pattern isn't suitable for oncoming traffic. Power consumption was a critical concern on my electric scooter. I only had 55 watts of 13.8 volt power for lighting. The DC/DC converter would not light a 55 watt halogen bulb (not enough inrush capability) and a 35 watt bulb provided insufficient illumination for safe riding. Plus, with only 30 ah of storage on-board, I really didn't want to feed even 35 watts to the lighting system. I installed one of these: http://www.trailtech.net/motorcycle_hid_parts.htm This light is rated at 13 watts nom, 10 watts to the HID bulb. It draws exactly 1 amp at 13.8 volts. The light output is essentially equivalent to a 55 watt MR-16 halogen lamp. This luminare uses the Welch-Allyn Solarc short arc metal halide system. They offer bulbs and ballasts in various sizes up to about 100 watts. The 13 watt lamp/ballast combo is more expensive from W-A than the whole fixture is from Trail Tech. Trail Tech sells the bulb and ballast as spare parts but the price is around $80. The HID lamp is mounted in a standard MR-16 reflector and in the projector version I got, projects a very sharp edged round beam. I suggest upgrading the wiring to your existing lights. Short direct runs of heavy gauge (8 or 10 gauge) wire directly from your DC/DC converter to the headlights. Use a relay to switch the lights, said relay operated by the existing headlight wiring. The dirt-cheap Bosch SPST 30 amp sugar cube relay available from any car parts store is a good choice. I've done a lot of these conversions for customers. I've never found more than 12 volts at the bulb terminals and then only with the engine running and the alternator at full voltage. More typical is something in the 11 volt range. Bringing the bulb terminal voltage up to 13.8 volts will almost double the light output (It doesn't double the power input. It merely moves more of the output from the infrared range to the visible range) and make it much more white. Very pleasing to the eye. You are properly concerned about the H4 light pattern being off. The reflector and lens is patterned to work with a line source of light. The HID bulb is almost a point source. I've tried to make the conversion work, both in headlights and in hand-held spotlights that use the H4 bulb. No joy. No amount of cutting or positioning can make up for the different emission geometry between the two. John On Wed, 01 Mar 2006 15:27:32 -0800, Paul Wallace <[EMAIL PROTECTED]> wrote: >Xenarc was making a dual beam (xenon high HID low) direct replacement >for the rectangular 6054 type sealed beam headlamps. They seem to have >discontinued these and are only making the little HID driving lamps now. > I should have purchased a set when I had the chance. > >The only way I can see to do this now is to get some of the Hella H4 >conversion units that replace the rectangular sealed beam with a lens >and reflector unit that will take a dual beam H4 lamp. Then get an HID >conversion kit for the H4 bulbs. These bulbs have both the xenon and >HID lamps on a common base. The kits include the wiring harness and the >ballast for the HID. I am concerned that the lens and reflector of the >Hella unit will not aim the HID beam correctly, creating glare for the >on coming traffic. > >Does anyone have experience with these HID conversions? > >Paul Wallace >'91 Chevy S-10 full of SAFT nicads > --- John De Armond See my website for my current email address http://www.johngsbbq.com Cleveland, Occupied TN A foolish consistency is the hobgoblin of little minds.-Ralph Waldo Emerson
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--- Begin Message ---Hello to All,For all you young guys out there, this post's title is a tag line from the original cops and bad guys TV series 'Dragnet' (readers should now hear the familiar Dragnet theme song in their heads). Yes, it's true, the adventures of Plasma Boy and his sidekick the Electric Monkey continue (you'll have to ask Tim about his name). Saturday was an absolute hoot when Tim and I took White Zombie down to PIR (Portland International Raceway) to go head to head with the cops!I had written:With a special invite from the police, White Zombie will be allowed to dice it out with the cops at their driver's training program...the driving school where cops learn to chase the bad guys and deal with outlaws attempting to elude...White Zombie will roast its tires and drag race police cars, as the officers turn on their lights and sirens in hot pursuit.... all the while at least one video camera will be rolling!Sometimes, things work out exactly as planned, and Saturday was just the case...well, except for the weather forecast. It was supposed to be a sunny day in the low 50's, but it was grey and overcast, windy, and in the mid 40's all day. Oh well, at least the overcast bit made for good digital picture quality. I drove White Zombie to the track with Tim following in the Northwest Handling Systems service truck, our rolling workshop-charging station our company is good enough to let us use. Arriving at PIR, it was strange to simply roll through the ticket gates without stopping to pay the entry fee. As we got closer to the track area, we could see perhaps 15 cop cars and a few other 'interesting' vehicles. It felt absolutely weird, purposefully driving right into the midst of where all the cops were, where the norm is to be on the lookout for these guys :-) We set up camp, powered up the generator, and started to recharge the car. Soon after, a small group of guys approached us, none in full uniform but several with cop's coats on, all packing heat! Our past coworker and friend, let's call him 'Officer Bill', was there to greet us and all of them were super friendly and excited to see the car. Tim handled the show and tell thing, while I got the video cam, digital cameras, and other stuff ready.It didn't take long for the first item of the day to take place...doing a tire shredding burnoff right next to a cop....well, make that several cops! Let me tell you, asking me to do this, was like asking your cat to ride atop the vacuum cleaner with it powered on. I mean, geesh, I've always avoided stunts like this, for the obvious reasons, but now here I was, being encouraged to 'light 'em up' sitting next to a cop! And light 'em up, I did! It's all captured on video, and it's way cool. White Zombie is poised next to a police cruiser, cherries on, as Plasma Boy starts the tire ignition sequence. As the tire smoke thickens, the cop car is soon enveloped in a cloud and all you can see is his lights flashing through the haze! What fun!After the smoke cleared, it was time to drag race a cop. Yes, you heard me right, I drag raced a cop! The sheriff at the wheel, let's call him 'Sheriff Fred', was none other than the master trainer in charge of everyone assembled on this day. Sherriff Fred is way cool, and when off duty has been prepping his new drag car, an ex-pursuit Camaro complete with a stroker 383 V8, and the light bar and everything! After witnessing the power of the Zombie, Sherrif Fred asks if I could give him a head start at the line. I agree. So here it is, Plasma Boy in White Zombie lined up with a Sherriff in a Ford Crown Vic cop car with performance chip and revised suspension...I'm ready to smoke Smokey! There's no staging lights or christmas tree, only another cop yelling ready, set, GO! The cop car ignites both rear tires, its V8 roars, and he takes off fairly impressively. I wait a second or so, then nail the Zombie, also lighting up both rear tires, more than I want to, with a not-so-impressive launch. The pack seems tired to me, but nonetheless, I easily catch the cop car at about 70 mph or so, right as the Zilla decides it's time to shift from series to parallel. With the Siamese 8 now humping at full boil, White Zombie jerks ahead of the cop as I extend my arm out the window and wave 'Bye Bye' to the cop. At 100+ mph, I'm at least 10 car lengths ahead of the cop. We slowed to make a U-turn and return back, something one could never do during an actual 1/4 mile drag race. To add to the fun of the video, Sherriff Fred turns on his lights and siren behind me, and for probably the only time I'll ever be able to, I totally disobey him and continue to elude! This is more fun, than any human should be allowed to have!!!! Back in the pit area, in front of his peers, Sherriff Fred says to me, "Thanks for blowing my doors off!"As we're charging the car back up, another officer asks if we want to race the MazdaSpeed sedan that's got 280+ four banger horses. One of the instructor officers uses this car as a bad guy vehicle, but it's also used to teach other rookies how to drive safely at high speeds. The fast and furious Mazda was really tearing up the track! Another cop had driven his bright yellow Z06 Corvette to the track, and he too, wanted to take on White Zombie. Unfortunately though, I was more focused on the battery pack that didn't seem to perform up to full potential and so passed on this challenge. Remember those Rudman regs we have for the Hawkers? Since the pack had given power so well last Fall, we never got around to getting them installed on the pack :-( Now, here I was wondering what was up with the batteries, when I found 5 of the 29 batteries had wandered away from the rest and were only about half charged! For several hours, I used a 35 amp 12V supply to individually bring up these 5 stragglers, one that took an additional 16 ahrs of juice! Once the five were pretty close to the rest of the batteries, I let the series charger bring the whole pack up at a very low level charge current. After this much needed recharge, the pack was rock'n like it used to and was now sitting at 378 volts static.Tim and I were ready for a late lunch and decided to take a 5 mile cruise in White Zombie over to the area's Jack in the Box. I asked Tim to behave himself, especially since we had been given so much freedom to do bad car things by the cops. And so we motored off driving as if our ride was once again, a little 'ol Datsun econo car. We made it all the way to the burger joint without a chirp of the tires, without any undue neck pain, and current draws were at 50 amps and under. The pack voltage stayed nice and stiff. After we ate and were headed back to the track, passing through an intersection we spotted a glossy black Subaru WRX, it's intercooler-feeding hood scoop standing out as if it were ready to suck up something. To the uninitiated, these bad boy street machines are fitted with potent 227 hp turbo fours that give the all wheel drive compacts performance on par with the stock muscle cars of the 60s. There's even a variant called the STi that packs 300 horses! So, as we pass through the light, the Sube driver's head follows the wacko be-stickered Datsun with fat tires with interest. Sure enough, he takes a right to come up from behind on our right side on the four lane road we're on. Perhaps 20 car lengths in front of him, is a car traveling along. Tim bets that at any moment, the WRX will be hammered hard and that the driver will want to show us his stuff blasting past our pesky old Datsun, then cutting in front of us to take our lane. To bait him on, Tim stays at the speed limit in the fast lane. Suddenly, my right ear picks up the whistle a turbo spooling up to full boost as the Sube's 4 banger growls deeper...he's going for it! The black machine comes up on my right swiftly, and though Tim's well aware of what's going on, he says to me, "Let's let him think he's got us." The Sube swooshes past us at a good clip, but just as his rear bumper is about 4 feet in front of White Zombie's fender, Tim slams the pedal down....instantly, and I mean 'instantly', the Zombie's rear tires bark and break loose as I am absolutely rammed hard into my seat....geesh, this car hauls ass when you're a passenger! If I had to pick the strongest point of acceleration power this car has, other than its incredible launch, it's from 40 mph to 90 mph, with the series-to-parallel shift somewhere in the middle. We rocket ahead and fly past the still-accelerating Sube as if he's put his car in reverse. I strain against the G-force to turn me head in time to see a look of absolute astonishment from the the Sube driver's face....then the second wave of power slams me back when it up shifts to parallel, the tires squeal a little, and the Zombie again rushes forward with a vengeance. Tim let the car rip up to something very illegal, as I protest for him to 'get out of it'. He does, finally, then coasts down from high speed lower and lower to something closer to the speed limit as we signal and lane change to the outer slow lane. A moment later, the Sube rolls slowly past us to our right, looking a bit depressed, but trying to save face by not actually making eye contact with us.We returned to the track, coming into the area slowly and respectfully. I actually felt a bit guilty for our sins, but oh well, what was done, was done. With the pack performing well now, we put the car back on charge. Within 15 minutes or so it was again, ready to play. By now, the Corvette cop and his car had gone home for the day, but as Tim pointed out, we've already toasted a few Vettes, no biggie. The MazdaSpeed sedan was also off the track, but it's not anything all that different from the hot Mitsu's or WRX STi's we race against all the time. What we really wanted, was to race another cop car!First though, Tim needed to be assured the pack was up to snuff, so we staged another burnout. This one was pretty awesome, I must say! With the wind whipping the smoke and all, and the good sound quality we got on tape, it's a video to watch! It was so severe, we had chunks of tire on the roof and hood of the car...the cops loved it! It's a pretty over-the top burnout, very Goldie-esque.After the tire burn, Tim invited Officer Bill to strap himself into the Zombie's passenger seat (yes, it's now got a new seat belt). We wanted to make it more fair for the cops, so we added a passenger to weight the car down some :-) The track was cold and we never let the air pressure out of the drag radials, so the Zombie had pretty bad traction problems. In fact, the cop car got the jump on Tim when wheel spin kept the electric car from launching hard. Tim lit 'em up for 50 feet or so with smoke peeling off both rear tires, let off the throttle, then nailed it again...the tires spun a second time when the Zilla went into parallel mode. After another 100 feet or so more, they finally hooked up and White Zombie lunged ahead blowing past the cop car still at full stride (after the ride Officer Bill told me it felt like they were hit from behind by a freight train).Towards the end of the day, Sherriff Fred had just given officer Bill's wife a polite spin around the entire PIR road course (2 miles) in his Crown Vic V8 cop car. I approached as they returned, and profusely thanked him for allowing us the opportunity to join them and have fun with the cops & bad guys routine. He looked at me (as I was wishing I had been taken for a spin) and said, "Want to go for a ride?" In seconds, I was in the passenger seat! Sherrif Fred is a very nice man with a great sense of humor, so as we start to head onto the track, he says to me, "We'd better stop and get some helmets...we're going to need them." Oh-oh, what's he got in mind? We swing close to the guard rail, and as he's being handed his helmet, I get out and run over to get mine. Tim's there to lend a hand cinching mine up for me, grinning from ear to ear as he knows I'm about to get the ride of my life. Evidently, Tim had been informed that when Sherriff Fred goes for the helmet, things are going to get exciting. We pull onto the track right at the start point for the 1/4 mile drag section, my familiar zone. Sheriff Fred nails it, both rear tires spin and squeal, and the throaty V8 pulls hard as we accelerate up to speed, faster and faster. I say to him, "Ya know, it's much better riding in the front seat, than back there (pointing to the caged-in bad guy rear seat). He gets a chuckle out of that one as he continues to push the car faster. We cross the 1/4 mile marker at a tick over 90 mph, respectable speed to be sure, but I'm compelled to say, "My car's doing 106 mph right here, I think you need an electric motor!" again, Sherriff Fred grins, and again, his right foot hasn't moved....now we're past 100 mph and rapidly approaching 'turn 1' at PIR.....Oh Oh...he's not slowing down!! GEESH!!!! (now squirming in my seat and bracing myself). I never dreamed a large car like this Ford Crown Vic police cruiser could corner the way this thing did! We flew through the curve in a 90-100 mph four wheel drift, then straightened and braked hard, then approaching the next twist in the track, he slammed it hard again as the V8 down-shifted with tires squealing and my cheeks stretching.....WHOOIE!!! The excitement never let up...ever....as we covered two miles of twisting track interspersed with straightaways very rapidly! The man can drive! Now I knew why 'he' was the master trainer. We took turn 9 (the last corner) very aggressively, leaving the pavement, catching grass, fishtailing, power sliding, then regaining a sense of direction to land back on the track....nearly filled my shorts on that one!The final blast of the day was the most outrageous burnout of all. Tim at the wheel again. The video is pretty cool!Somebody arrest me, I'm having way too much fun! See Ya.....John Wayland
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--- Begin Message --- You could run one of those cheap AC Induction motors with it. Lawrence Rhodes........ ----- Original Message ----- From: "Ryan Bohm" <[EMAIL PROTECTED]>To: "EV List" <[email protected]> Sent: Wednesday, March 01, 2006 6:11 PM Subject: GE EV2000 ControllerHi Everyone,A guy contacted me to find out if I was interested in a GE EV2000 Controller that he picked up at a gov't surplus auction. I don't have a use for it right now. He sent me some pictures which I posted here:http://www.evsource.com/temp/ev2000/ev2000.htmlIf anyone can shed more light on this controller, that would be great. It would be great if it could work out in a light conversion for someone.-Ryan -- - EV Source <http://www.evsource.com> - Selling names like Zilla, PFC Chargers, and WarP Motors E-mail: mailto:[EMAIL PROTECTED] Toll-free: 1-877-215-6781
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--- Begin Message ---The most common source for a charging pedestal with safety features is an RV hookup. These are available in anything from 15 amp 120 VAC to 50 amp 240 VAC. Most are available with GFCI built in so you can reset it without needing to enter the building to access the indoor power panel. The best reference I have found is at http://www.eatonelectrical.com/NASApp/cs/ContentServer?pagename=C-H/Common/AssetTemplateLink&c=Apubarticles&cid=983558189481&Sec=products Joe Smalley Rural Kitsap County WA Fiesta 48 volts NEDRA 48 volt street conversion record holder [EMAIL PROTECTED] ----- Original Message ----- From: "Cor van de Water" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, February 27, 2006 10:40 PM Subject: Charging outlet - what is common? > What type of charging outlet do you have or is most used > and where to get it best? > I consider an indoor and one outdoor outlet, most likely a 30A > 240V type. > Is a dryer type outlet common? > Which type or where to get a waterproof version for outdoor? > > How are experiences between this outlet and an AVCON? > > Regards, > > Cor van de Water > Systems Architect > Email: [EMAIL PROTECTED] Private: http://www.cvandewater.com > Skype: cor_van_de_water IM: [EMAIL PROTECTED] > Tel: +1 408 542 5225 VoIP: +31 20 3987567 FWD# 25925 > Fax: +1 408 731 3675 eFAX: +31-87-784-1130 > Proxim Wireless Networks eFAX: +1-610-423-5743 > Take your network further http://www.proxim.com
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--- Begin Message ---Hi All, i've been thinking of building my own dc-dc convertor using a variation of the old square-wave inverter design used in cheap ups's etc, a centre tapped primary with the centre tap at battery voltage and grounding each end of the primary alternately. Because the output is rectified the switching frequency no longer needs to be 50 or 60 hertz. Finally the point of this email, does anyone have a feel for the maximum frequency i can reasonably run an ordinary soft iron laminated core transformer. I suspect its dependent on the quality of the laminations but would be happy with a ballpark figure. Thanks, Justin -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.375 / Virus Database: 268.1.1/272 - Release Date: 01-03-06
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--- Begin Message ---On Wed, 1 Mar 2006 22:26:53 -0800, "Joe Smalley" <[EMAIL PROTECTED]> wrote: >> This came up on the Datsun Roadster forums, and I thought it would be >> kinda handy for those into performance EVs: >> >> http://www.charm.net/~mchaney/homedyno/homedyno.htm >> >> Now if someone could come up with a way to convert the signal from a >> typical RPM sensor on an electric motor into an appropriate audio >signal... I have an older version of that software as well as some competing versions. It works well if you can feed it a clean signal. Getting the signal is fairly easy. A 4 pulse per rev pickup will simulate a V8. A cross-shaped hunk of steel and a variable reluctor pickup (standard car part) will do the trick. As would a hub with 4 set screws spaced at 90 deg intervals. Another good place to grab a signal is the speedo drive. If your vehicle doesn't have a VSS, one can easily be added. Most are 4 pulses per rev. If you have a non-automotive type signal to deal with such as with a 60 pulse per rev standard industrial encoder wheel, conversion is easy. Just bring the wav file into a sound editing program like Cool Edit Pro (now Adobe Audition or something like that) and use the multiplication DSP function to scale the signal. To make a 60 ppr signal look like a 4 ppr V8 signal, simply multiply the wav file by 4/60. Save the new wav file and send it to the road dyno software. You could also do it in real time in the analog domain with an oscillator and double balanced mixer and/or PLL but that'd require some soldering iron work. John --- John De Armond See my website for my current email address http://www.johngsbbq.com Cleveland, Occupied TN A foolish consistency is the hobgoblin of little minds.-Ralph Waldo Emerson
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--- Begin Message --- You probably want to go to the EVTech list on this one. Lee Hart is very knowledgeable.Danny Justin Southam wrote:Hi All, i've been thinking of building my own dc-dc convertor using a variation of the old square-wave inverter design used in cheap ups's etc, a centre tapped primary with the centre tap at battery voltage and grounding each end of the primary alternately. Because the output is rectified the switching frequency no longer needs to be 50 or 60 hertz. Finally the point of this email, does anyone have a feel for the maximum frequency i can reasonably run an ordinary soft iron laminated core transformer. I suspect its dependent on the quality of the laminations but would be happy with aballpark figure.Thanks, Justin
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--- Begin Message ---On Mar 1, 2006, at 7:40 AM, Lee Hart wrote:Mark Freidberg wrote:Has anyone tried using a graphic equalizer display?Not that I know of. But it fits in well with an idea I had. Build a simple RC oscillator whose amplitude is proportional to its supply voltage (easy; they tend to do this anyway). Use this oscillator to drive a tiny speaker. Build a bunch of them, one per battery. Tune each one to a different frequency. Now the frequency tells you which battery, and the amplitude tells you its voltage. Put each one in a little sealed container (like a pill bottle). Drill a hole in each, just big enough to squeeze in a small plastic hose (like aquarium tubing). "T" all these hoses together, and run them to thedash. Put a microphone in the dashboard end, and feed it to your graphicequalizer. My graphic equalizer has 10 bands for each of the 2 stereo channels; thus it can monitor 20 batteries. The fluorescent display has 10 levels for each of the 20 bands. There is a "level" control for each channel, so it can be calibrated right from the dash. Simple, isolated, and easy to build!How about running the outputs to small audio transformers instead of speakers? The outputs can be wired together and provide an audio signal. A car EQ generally expects an audio signal input.Paul "neon" G.
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--- Begin Message ---On Mar 1, 2006, at 12:05 PM, Pestka, Dennis J wrote:Need some help determining if the transmission in my 1965 Datsun truck canhandle the torque that I may subject it to. Maybe someone can help with a simple way to determine this.A few hard drives will determine it :-)I have set up a spreadsheet to look at Horsepower and Torque based on different voltages/amperages/efficiencies. It gives me 173.73 HP based on a 144 volt setup @ 1000 Amps @ 90% efficiency. First, is this correct?I'd expect a lower efficiency when you pushing 1000 amps through most EV sized motors (70%?) Also, you failed to take battery voltage sag into account. I figure it will be closer to 124 HP (132 actual volts, 1000 battery amps, 70% motor efficiency at that high power level.) Oh, those number assume good stiff AGM batteries. Flooded golf cart batteries would lower the actual voltage to about 72 volts! (plus they will complain)It is also showing 9124 ft/lbs of Torque @ 100 RPM. Is this correct or am I "Way Out" in left field on this?Something is wrong here! Take a look at the motor torque curves if they are available for your motor. Generally, torque and amps are directly related. For example, a Prestolite MTC-4001 motor makes 64 ft/lb. of torque at 400 amps. It doesn't matter what the motor voltage is - it just has to be what is needed to push 400 amps through the motor at whatever rpm I want 64 ft/lb. of torque (with my 120 volt system I can't have it over 3500 rpm.)Paul "neon" G.
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--- Begin Message ---In relation to the battery sag, were you assuming Flooded or Sealed? Does anyone know the current limit drop off point on a 1000A Zilla? Thanks; Dennis -----Original Message----- From: David Dymaxion [mailto:[EMAIL PROTECTED] Sent: Wednesday, March 01, 2006 3:08 PM To: [email protected] Subject: Re: Horsepower / Torque Comments interspersed. --- "Pestka, Dennis J" <[EMAIL PROTECTED]> wrote: > ... > I have set up a spreadsheet to look at Horsepower and Torque based on > different voltages/amperages/efficiencies. > It gives me 173.73 HP based on a 144 volt setup @ 1000 Amps @ 90% > efficiency. > First, is this correct? Don't forget the batteries will sag at those currents. For instance, for a 5 milliohm internal resistance battery, each battery will sag 5 mohm * 1000 Amps = 5 V. So your 144 V becomes more like 84 V, so it would be closer to 100 hp. > It is also showing 9124 ft/lbs of Torque @ 100 RPM. > Is this correct or am I "Way Out" in left field on this? 9000 ft*lbs is like 20 times what a Corvette makes. You would get these kinds of torques if you could throw the full power at the motor at that low of an rpm. You can't do that, though, without melting the motor, so the controller will put you into current limit (stepping down the voltage in the process). So your calculation would only be good at the rpm at which the controller drops out of current limit. At that point the motor is seeing full power. So if we guess that occurs around 3000 rpm, your torque is more like about 260 ft*lbs of torque (which is about 1/2 of Corvette torque). This number is fairly constant at low rpm in current limit, and drops off as 1/rpm as rpm climbs above current limit. So these numbers would be torque into your tranny. Your tranny trades speed for torque, so it will multiply your torque by the gear ratio, and the rear end will multiply it, too, so you'll have ~2600 ft. lbs of torque at the rear wheels in 1st gear. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
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--- Begin Message ---Hey John all Man I wish I could have been there!!! I had even practiced my "Dat's NOT Mine! , and We don't need NO stinking badges Lines, LMAO!!! I can't wait to see the pics and video. As soon as I get them I'll throw them up at the site for everyone, being John seems to have no time here lately having all the fun 8^ ) Cya Jim Husted Hi-Torque Electric John Wayland <[EMAIL PROTECTED]> wrote: Hello to All, For all you young guys out there, this post's title is a tag line from the original cops and bad guys TV series 'Dragnet' (readers should now hear the familiar Dragnet theme song in their heads). Yes, it's true, the adventures of Plasma Boy and his sidekick the Electric Monkey continue (you'll have to ask Tim about his name). Saturday was an absolute hoot when Tim and I took White Zombie down to PIR (Portland International Raceway) to go head to head with the cops! I had written: > With a special invite from the police, White Zombie will be allowed to > dice it out with the cops at their driver's training program...the > driving school where cops learn to chase the bad guys and deal with > outlaws attempting to elude...White Zombie will roast its tires and > drag race police cars, as the officers turn on their lights and sirens > in hot pursuit.... all the while at least one video camera will be > rolling! Sometimes, things work out exactly as planned, and Saturday was just the case...well, except for the weather forecast. It was supposed to be a sunny day in the low 50's, but it was grey and overcast, windy, and in the mid 40's all day. Oh well, at least the overcast bit made for good digital picture quality. I drove White Zombie to the track with Tim following in the Northwest Handling Systems service truck, our rolling workshop-charging station our company is good enough to let us use. Arriving at PIR, it was strange to simply roll through the ticket gates without stopping to pay the entry fee. As we got closer to the track area, we could see perhaps 15 cop cars and a few other 'interesting' vehicles. It felt absolutely weird, purposefully driving right into the midst of where all the cops were, where the norm is to be on the lookout for these guys :-) We set up camp, powered up the generator, and started to recharge the car. Soon after, a small group of guys approached us, none in full uniform but several with cop's coats on, all packing heat! Our past coworker and friend, let's call him 'Officer Bill', was there to greet us and all of them were super friendly and excited to see the car. Tim handled the show and tell thing, while I got the video cam, digital cameras, and other stuff ready. It didn't take long for the first item of the day to take place...doing a tire shredding burnoff right next to a cop....well, make that several cops! Let me tell you, asking me to do this, was like asking your cat to ride atop the vacuum cleaner with it powered on. I mean, geesh, I've always avoided stunts like this, for the obvious reasons, but now here I was, being encouraged to 'light 'em up' sitting next to a cop! And light 'em up, I did! It's all captured on video, and it's way cool. White Zombie is poised next to a police cruiser, cherries on, as Plasma Boy starts the tire ignition sequence. As the tire smoke thickens, the cop car is soon enveloped in a cloud and all you can see is his lights flashing through the haze! What fun! After the smoke cleared, it was time to drag race a cop. Yes, you heard me right, I drag raced a cop! The sheriff at the wheel, let's call him 'Sheriff Fred', was none other than the master trainer in charge of everyone assembled on this day. Sherriff Fred is way cool, and when off duty has been prepping his new drag car, an ex-pursuit Camaro complete with a stroker 383 V8, and the light bar and everything! After witnessing the power of the Zombie, Sherrif Fred asks if I could give him a head start at the line. I agree. So here it is, Plasma Boy in White Zombie lined up with a Sherriff in a Ford Crown Vic cop car with performance chip and revised suspension...I'm ready to smoke Smokey! There's no staging lights or christmas tree, only another cop yelling ready, set, GO! The cop car ignites both rear tires, its V8 roars, and he takes off fairly impressively. I wait a second or so, then nail the Zombie, also lighting up both rear tires, more than I want to, with a not-so-impressive launch. The pack seems tired to me, but nonetheless, I easily catch the cop car at about 70 mph or so, right as the Zilla decides it's time to shift from series to parallel. With the Siamese 8 now humping at full boil, White Zombie jerks ahead of the cop as I extend my arm out the window and wave 'Bye Bye' to the cop. At 100+ mph, I'm at least 10 car lengths ahead of the cop. We slowed to make a U-turn and return back, something one could never do during an actual 1/4 mile drag race. To add to the fun of the video, Sherriff Fred turns on his lights and siren behind me, and for probably the only time I'll ever be able to, I totally disobey him and continue to elude! This is more fun, than any human should be allowed to have!!!! Back in the pit area, in front of his peers, Sherriff Fred says to me, "Thanks for blowing my doors off!" As we're charging the car back up, another officer asks if we want to race the MazdaSpeed sedan that's got 280+ four banger horses. One of the instructor officers uses this car as a bad guy vehicle, but it's also used to teach other rookies how to drive safely at high speeds. The fast and furious Mazda was really tearing up the track! Another cop had driven his bright yellow Z06 Corvette to the track, and he too, wanted to take on White Zombie. Unfortunately though, I was more focused on the battery pack that didn't seem to perform up to full potential and so passed on this challenge. Remember those Rudman regs we have for the Hawkers? Since the pack had given power so well last Fall, we never got around to getting them installed on the pack :-( Now, here I was wondering what was up with the batteries, when I found 5 of the 29 batteries had wandered away from the rest and were only about half charged! For several hours, I used a 35 amp 12V supply to individually bring up these 5 stragglers, one that took an additional 16 ahrs of juice! Once the five were pretty close to the rest of the batteries, I let the series charger bring the whole pack up at a very low level charge current. After this much needed recharge, the pack was rock'n like it used to and was now sitting at 378 volts static. Tim and I were ready for a late lunch and decided to take a 5 mile cruise in White Zombie over to the area's Jack in the Box. I asked Tim to behave himself, especially since we had been given so much freedom to do bad car things by the cops. And so we motored off driving as if our ride was once again, a little 'ol Datsun econo car. We made it all the way to the burger joint without a chirp of the tires, without any undue neck pain, and current draws were at 50 amps and under. The pack voltage stayed nice and stiff. After we ate and were headed back to the track, passing through an intersection we spotted a glossy black Subaru WRX, it's intercooler-feeding hood scoop standing out as if it were ready to suck up something. To the uninitiated, these bad boy street machines are fitted with potent 227 hp turbo fours that give the all wheel drive compacts performance on par with the stock muscle cars of the 60s. There's even a variant called the STi that packs 300 horses! So, as we pass through the light, the Sube driver's head follows the wacko be-stickered Datsun with fat tires with interest. Sure enough, he takes a right to come up from behind on our right side on the four lane road we're on. Perhaps 20 car lengths in front of him, is a car traveling along. Tim bets that at any moment, the WRX will be hammered hard and that the driver will want to show us his stuff blasting past our pesky old Datsun, then cutting in front of us to take our lane. To bait him on, Tim stays at the speed limit in the fast lane. Suddenly, my right ear picks up the whistle a turbo spooling up to full boost as the Sube's 4 banger growls deeper...he's going for it! The black machine comes up on my right swiftly, and though Tim's well aware of what's going on, he says to me, "Let's let him think he's got us." The Sube swooshes past us at a good clip, but just as his rear bumper is about 4 feet in front of White Zombie's fender, Tim slams the pedal down....instantly, and I mean 'instantly', the Zombie's rear tires bark and break loose as I am absolutely rammed hard into my seat....geesh, this car hauls ass when you're a passenger! If I had to pick the strongest point of acceleration power this car has, other than its incredible launch, it's from 40 mph to 90 mph, with the series-to-parallel shift somewhere in the middle. We rocket ahead and fly past the still-accelerating Sube as if he's put his car in reverse. I strain against the G-force to turn me head in time to see a look of absolute astonishment from the the Sube driver's face....then the second wave of power slams me back when it up shifts to parallel, the tires squeal a little, and the Zombie again rushes forward with a vengeance. Tim let the car rip up to something very illegal, as I protest for him to 'get out of it'. He does, finally, then coasts down from high speed lower and lower to something closer to the speed limit as we signal and lane change to the outer slow lane. A moment later, the Sube rolls slowly past us to our right, looking a bit depressed, but trying to save face by not actually making eye contact with us. We returned to the track, coming into the area slowly and respectfully. I actually felt a bit guilty for our sins, but oh well, what was done, was done. With the pack performing well now, we put the car back on charge. Within 15 minutes or so it was again, ready to play. By now, the Corvette cop and his car had gone home for the day, but as Tim pointed out, we've already toasted a few Vettes, no biggie. The MazdaSpeed sedan was also off the track, but it's not anything all that different from the hot Mitsu's or WRX STi's we race against all the time. What we really wanted, was to race another cop car! First though, Tim needed to be assured the pack was up to snuff, so we staged another burnout. This one was pretty awesome, I must say! With the wind whipping the smoke and all, and the good sound quality we got on tape, it's a video to watch! It was so severe, we had chunks of tire on the roof and hood of the car...the cops loved it! It's a pretty over-the top burnout, very Goldie-esque. After the tire burn, Tim invited Officer Bill to strap himself into the Zombie's passenger seat (yes, it's now got a new seat belt). We wanted to make it more fair for the cops, so we added a passenger to weight the car down some :-) The track was cold and we never let the air pressure out of the drag radials, so the Zombie had pretty bad traction problems. In fact, the cop car got the jump on Tim when wheel spin kept the electric car from launching hard. Tim lit 'em up for 50 feet or so with smoke peeling off both rear tires, let off the throttle, then nailed it again...the tires spun a second time when the Zilla went into parallel mode. After another 100 feet or so more, they finally hooked up and White Zombie lunged ahead blowing past the cop car still at full stride (after the ride Officer Bill told me it felt like they were hit from behind by a freight train). Towards the end of the day, Sherriff Fred had just given officer Bill's wife a polite spin around the entire PIR road course (2 miles) in his Crown Vic V8 cop car. I approached as they returned, and profusely thanked him for allowing us the opportunity to join them and have fun with the cops & bad guys routine. He looked at me (as I was wishing I had been taken for a spin) and said, "Want to go for a ride?" In seconds, I was in the passenger seat! Sherrif Fred is a very nice man with a great sense of humor, so as we start to head onto the track, he says to me, "We'd better stop and get some helmets...we're going to need them." Oh-oh, what's he got in mind? We swing close to the guard rail, and as he's being handed his helmet, I get out and run over to get mine. Tim's there to lend a hand cinching mine up for me, grinning from ear to ear as he knows I'm about to get the ride of my life. Evidently, Tim had been informed that when Sherriff Fred goes for the helmet, things are going to get exciting. We pull onto the track right at the start point for the 1/4 mile drag section, my familiar zone. Sheriff Fred nails it, both rear tires spin and squeal, and the throaty V8 pulls hard as we accelerate up to speed, faster and faster. I say to him, "Ya know, it's much better riding in the front seat, than back there (pointing to the caged-in bad guy rear seat). He gets a chuckle out of that one as he continues to push the car faster. We cross the 1/4 mile marker at a tick over 90 mph, respectable speed to be sure, but I'm compelled to say, "My car's doing 106 mph right here, I think you need an electric motor!" again, Sherriff Fred grins, and again, his right foot hasn't moved....now we're past 100 mph and rapidly approaching 'turn 1' at PIR.....Oh Oh...he's not slowing down!! GEESH!!!! (now squirming in my seat and bracing myself). I never dreamed a large car like this Ford Crown Vic police cruiser could corner the way this thing did! We flew through the curve in a 90-100 mph four wheel drift, then straightened and braked hard, then approaching the next twist in the track, he slammed it hard again as the V8 down-shifted with tires squealing and my cheeks stretching.....WHOOIE!!! The excitement never let up...ever....as we covered two miles of twisting track interspersed with straightaways very rapidly! The man can drive! Now I knew why 'he' was the master trainer. We took turn 9 (the last corner) very aggressively, leaving the pavement, catching grass, fishtailing, power sliding, then regaining a sense of direction to land back on the track....nearly filled my shorts on that one! The final blast of the day was the most outrageous burnout of all. Tim at the wheel again. The video is pretty cool! Somebody arrest me, I'm having way too much fun! See Ya.....John Wayland --------------------------------- Yahoo! Mail Bring photos to life! New PhotoMail makes sharing a breeze.
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