[uucdigest] Sunday, September 21 2003 Volume 03 : Number 6770
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Send 'em to [EMAIL PROTECTED] |__________________________________________________________________ In this BMW UUC Digest: Re: [uuc] [E36 M3] Cam install [uuc] <misc> bmw at the hardware store Re: [uuc] <misc> bmw at the hardware store Re: [uuc] Minimum Brake Pad Thicknesses for Track Usage [uuc] E30 starter prob ---------------------------------------------------------------------- Date: Sat, 20 Sep 2003 18:00:37 -0400 From: "Brian Daley" <[EMAIL PROTECTED]> Subject: Re: [uuc] [E36 M3] Cam install I don't know about the Bosch motronic stuff, but the Ford EECs can compensate +/-25% on fuel. Although adaptive only updates at part throttle (closed loop) the learned correction factor is still applied at WOT (open loop) the assumption being that if fueling is off by x% at part throttle then the same correction is likely to be in the ballpark at WOT. That's obviously an oversimplification of the process, but should convey the basic idea. Whether or not motronic has similar logic is probably dependent on version, presumably more recent versions are more sophisticated. Brian Daley '94 325ic - ----- Original Message ----- From: "Gary Derian" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, September 18, 2003 4:25 PM Subject: Re: [uuc] [E36 M3] Cam install > And it only is used at part throttle. > Gary Derian > > > > > O2 sensor control has limits. It can't correct for anything more than > minor > > deviations. > > > > Brett Anderson > > KMS > > ------------------------------ Date: Sat, 20 Sep 2003 15:32:53 -0700 (PDT) From: John Bolhuis <[EMAIL PROTECTED]> Subject: [uuc] <misc> bmw at the hardware store I was at my local Ace hardware this morning and asked the cashier "Why the plywood over the windows there?" (I'm in CA, so I knew it wasn't for hurricane Isabel) She tells me that a newly licensed 16 year old girl came through the storefront after closing one night. Now I'm thinking, oopsie, she jumped up the curb and broke the window before stopping. Then the cashier points me at the skidmarks on the floor near me and hands me a set of photographs of the aftermath. This E34's back bumper was 15 feet from the front window and was clawing for traction on the tile floor. But those display racks quickly stack up against each other and get too hard to push. I feel bad for that little girl who was scared stiff with her foot planted firmly on the gas instead of the brake. But not to worry, they reported that she was alright, and daddy got her a Mercedes to replace the Bimmer. - -- "It is an honor to be Cookie Monster." -Sesame Street spokeswoman Audrey Shapiro ------------------------------ Date: Sat, 20 Sep 2003 16:05:37 -0700 (PDT) From: Tammer Farid <[EMAIL PROTECTED]> Subject: Re: [uuc] <misc> bmw at the hardware store Are those pics online anywhere? tammer - --- John Bolhuis <[EMAIL PROTECTED]> wrote: > I was at my local Ace hardware this morning and asked > the cashier > "Why the plywood over the windows there?" (I'm in CA, so > I knew it > wasn't for hurricane Isabel) She tells me that a newly > licensed 16 > year old girl came through the storefront after closing > one night. > Now I'm thinking, oopsie, she jumped up the curb and > broke the window > before stopping. > Then the cashier points me at the skidmarks on the floor > near me and > hands me a set of photographs of the aftermath. This > E34's back > bumper was 15 feet from the front window and was clawing > for traction > on the tile floor. But those display racks quickly stack > up against > each other and get too hard to push. > I feel bad for that little girl who was scared stiff > with her foot > planted firmly on the gas instead of the brake. But not > to worry, > they reported that she was alright, and daddy got her a > Mercedes to > replace the Bimmer. > > -- > "It is an honor to be Cookie Monster." > -Sesame Street spokeswoman Audrey Shapiro > __________________________________ Do you Yahoo!? Yahoo! SiteBuilder - Free, easy-to-use web site design software http://sitebuilder.yahoo.com ------------------------------ Date: Sun, 21 Sep 2003 11:27:16 -0700 From: "Joe Elwell" <[EMAIL PROTECTED]> Subject: Re: [uuc] Minimum Brake Pad Thicknesses for Track Usage Thought I'd share some info on a few brake failures I've seen. Thankfully, no one was injured in either, but witnessing them has made me pretty conservative about how far down I'll take my pads. Check out this picture: http://64.163.218.124/brake_pic/pad&piston.jpg Ok, it's not a BMW backing plate/piston - its from a Miata.. Running pads down to backing plate can be taken too far - in this case, the car may have been raced without pad material for several laps, but in any case, it was the heat eventually did the damage. Complete loss of hydraulic pressure. Car ran off end of fastest straight - luckily no one was injured. BMW backing plates are thicker than Miatas, though. Analysis of the other front wheel brakes showed a fair amount of pad material left, which reminds me - check BOTH pads on all four wheels. I saw heat do something similar on a BMW, running PF pads of some kind on stock (floating) calipers. A caliper apparently got stuck and generated lots of heat. There was a complete loss of hydraulic pressure, and the car went off track and was badly damaged. The initial amount of pad seemed sufficient (as judged by the other wheel), but after the failure there was no pad left on the piston-side of the caliper. The heat had melted the rubber bleeder cap, and perhaps had also melted the o-ring. When the car was towed back to the pits, it was dripping brake fluid... Remaining thickness on the other pad (same wheel) was about fine - about 20%. Same on both pads on other front wheel. Joe - ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Cc: "Marco Romani" <[EMAIL PROTECTED]> Sent: Friday, September 19, 2003 10:21 AM Subject: RE: [uuc] Minimum Brake Pad Thicknesses for Track Usage > "Marco Romani" <[EMAIL PROTECTED]> wrote: > > > > I was told that it was possible by a former BMW mechanic that races > > an E36. I've rebuilt many a caliper, thanks. However, I've never > > bothered to do the math on if the rotor is at minimum run out and > > the pads are gone if the cyclinder can get to the point where it > > will leak. I didn't say the cylinder will fall out and go shooting > > across the track. ;-) > > Yeah, I was exaggerating a bit. > Like the other poster had clarified, old outer dust seals are very likely > to dislodge at full caliper extension (low pads + low rotor). That will > allow dust and moisture to get onto the piston surface. In time, the > piston will scar/corrode that may in turn damage the internal fluid seal. > In a round-about way you may end up with a brake fluid leak if you abuse > and neglect your caliper seals, but it's not an immediate experience. > > > Next time I have everything apart I'll measure it. > > I'm pretty sure you'll end up with plenty of spare piston length. Either > that or a group of BMW brake engineers are developing second careers as > janitors. > > > never-the-less pads are cheap. Track time is expensive. Why get > > to the point where you may have to loose track time to save a few > > bucks on pads? > > Because most of us are cheap bastards with more time than money! > Plus, changing pads is fun (or so I keep telling myself ;-) > > > I have seen some guys run the backing plates down so far that they > > were about 1/2 normal thickness. Amazing. > > OK, I'm not THAT cheap. > But I do like to get my money's worth from the pads. > With the exception for all PBR/Repco products. Somehow every one of those > I've ever tried had begged their way into my trash can long before they > wore out. > > alex f > > ------------------------------ Date: Sun, 21 Sep 2003 21:37:52 -0400 From: "Pharr, Jeff" <[EMAIL PROTECTED]> Subject: [uuc] E30 starter prob I just completed a motor swap in an '89 325 and now I'm having a little starter problem. I know the starter was good because I used it once to start the 'new' motor I just installed. The single symptom is that when the ignition is turned to Start there is a whirring sound from the starter but no cranking of the motor. There is no loud click to suggest that the solenoid is moving the starter gear to mesh with the ring gear and it sounds like the starter gear is just spinning freely. I would have to assume that I have something wired incorrectly but for the life of me I can't see what it might be. The only wire that has to be disconnected for the swap is the big fat ++ cable and there is really only one spot that it will go. I didn't think the design of the E30 starter would switch power to the starter motor until it was fully engaged with the ring gear so it seems like this may be a solenoid switch failure but I'm not a big believer in coincidences like this. Any thoughts on what I might have screwed up/knocked loose that would cause this sort of symptom? Oh, and I don't think it's a battery issue. The battery was pretty strong when I started the swap, but I hooked up my charger and set it to 'Jump Start' just to make sure and it did not change the symptom at all. Thanks, - --Jeff ------------------------------ End of [uucdigest] V3 #6770 *************************** | | In memory of Michel Potheau - friend, enthusiast, founder of the BMW CCA. |________________________________________ | Please visit these UUC-approved BMW parts vendors/service providers: | (listed alphabetically) | | Autoscope-Motorsports - http://www.autoscope-motorsports.com | |==================================================== | | Koala MotorSport . BMW technical information, special tool sales/rental | http://www.koalamotorsport.com | |==================================================== | | Taylor BMW - http://www.taylorbmw.com - Doc Bimmer! | |==================================================== | Turner Motorsport Inc . 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