Re: [EVDL] Rear Diff IRS | Direct Drive

FYI Motive Gear offers gear sets in ratios up to 7.33 for the 9" Ford rear end. https://www.speedwaymotors.com/shop/differential-ring-and-pinions~14-5-494-10438?facet=l_ratio:48507 Dan Dan 520-834-4176 I10 and Twin Peaks On 12/4/2019 2:49 PM, forrest.whitmore via EV wrote: Electric

Re: [EVDL] Rear Diff IRS | Direct Drive

On 5 Dec 2019 at 1:43, Cor van de Water via EV wrote: > An HTML attachment was scrubbed... This is why you shouldn't send html-only email to the list. The listserver HATES that, and it will make your message sit in the corner wearing a dunce cap. :-\ Here's the message: Another datapoint:

Re: [EVDL] Rear Diff IRS | Direct Drive

An HTML attachment was scrubbed... URL: ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO:

Re: [EVDL] Rear Diff IRS | Direct Drive

Mark Grasser via EV wrote: You might consider changing the gear ratio. I am using a BMW diff that has a 4.44 to 1 ratio which is a little low also but I am using 2 9" motors in series that will make things better. If I don't like it I am going to use a Ford thunderbird diff which can be loaded

Re: [EVDL] Rear Diff IRS | Direct Drive

Mark Grasser -Original Message- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of forrest.whitmore via EV Sent: Wednesday, December 04, 2019 3:50 PM To: ev@lists.evdl.org Cc: forrest.whitmore Subject: Re: [EVDL] Rear Diff IRS | Direct Drive Electric Vehicle Discussion List mailing

Re: [EVDL] Rear Diff IRS | Direct Drive

Electric Vehicle Discussion List mailing list wrote > > Finally, there is the efficiency advantage of operating at the motor's > peak > of the rpm-vs-efficiency curve, which also means less of the energy wasted > as heat. > > I think you probably want to gear your drive so that your motor is

Re: [EVDL] Rear Diff IRS | Direct Drive

> Perhaps it was the cannabis division that suggested it could be different. If that were the case, the value of Pi would be 4.20 ___ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO:

Re: [EVDL] Rear Diff IRS | Direct Drive

Perhaps it was the cannabis division that suggested it could be different. - Mark Sent from my Fuel Cell powered iPhone > On Nov 27, 2019, at 12:21 PM, Gail Lucas via EV wrote: > > David, am I misinterpreting this or did Xerox actually suggest that pi might > change? I still have FORTRAN

Re: [EVDL] Rear Diff IRS | Direct Drive

That’s a joke. FORTRAN is unique AFAIK in that it had no constants. You could assign new values to strings like “42” = 327. This leads to horrifying bugs, as you might imagine. The person writing the documentation probably didn’t approve of this misfeature. -- Doug Weathers

Re: [EVDL] Rear Diff IRS | Direct Drive

David, am I misinterpreting this or did Xerox actually suggest that pi might change? I still have FORTRAN manuals but none for Xerox specifically. Gail On 11/26/2019 6:44 PM, EVDL Administrator via EV wrote: "The primary purpose of the DATA statement is to give names to constants. Instead of

Re: [EVDL] Rear Diff IRS | Direct Drive

“The diameter divides into the circumference, you know. It ought to be three times. You'd think so, wouldn't you? But does it? No. Three point one four one and lots of other figures. There's no end to the buggers. Do you know how pissed off that makes me?" "I expect it makes you extremely

Re: [EVDL] Rear Diff IRS | Direct Drive

On 26 Nov 2019 at 13:33, Alan Brinkman via EV wrote: > A 28.7" tall tire has a circumference of PI * 28.7 or 3.17*28.7 The value of Pi has changed? Yikes! Good thing I put #define PI 3.14159 in stdio.h. :-) "The primary purpose of the DATA statement is to give names to constants. Instead

Re: [EVDL] Rear Diff IRS | Direct Drive

Hi David, Thank you for the reply and the welcome! I can't believe I've been missing out on EVDL for this long - it's a great resource! This helps understand the relationship a bit better. Hi Alan, Thank you for the response - I appreciate the detail. My next step, as you

Re: [EVDL] Rear Diff IRS | Direct Drive

Forrest, A 28.7" tall tire has a circumference of PI * 28.7 or 3.17*28.7 or 90.98" or 7.58 feet. 3,000 motor rpm *1 drive shaft revolution / 3.27 rear axle revolutions = 917.43 rpm 917.43 rpm * 7.58 feet circumference of tire = 6,954 feet / minute * 1 mile / 5,280 feet = 1.317 miles / minute * 60

Re: [EVDL] Rear Diff IRS | Direct Drive

Hi Forrest, and welcome to the EVDL! At 80mph, a wheel of 28.7" diameter will be turning at about 940rpm, not 3000rpm. ((5280*12)/(28.7*3.14))*(8/6) With a 3.27 differential ratio, your motor will be turning at 3070rpm. If you think about typical tachometer readings in an ICEV, this is about