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#1. Re: Stability problems under braking - Rear control arm bushings? - from Neil Maller
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Date: Sat, 10 Aug 2002 09:11:04 -0500 From: Neil Maller <neil.maller@gte.net> Subject: Re: Stability problems under braking - Rear control arm bushings? on 8/10/02 1:25 AM, AVUSM3@aol.com wrote: > I have a '95 which has seen 20+ track days. Recently > under hard braking I have experienced a strange > situation. The steering wheel is turning to the left > about 20 degrees, and I can feel the rear of the > car rotating to the left (a clockwise yaw when viewed > from the top). The problem is not related to the > brakes as far as I can tell, since I have new pads and > rotors, and the calipers are relatively fresh. The > problem is also not alignment related since that > was done recently as well. A mechanic has looked > at the car and said it could be one of three things - > > 1) tie-rod ends are worn and need replacing > > 2) the rubber bushing at the rear of the control > arms on the front suspension are shot and need > replacing > > 3) the bushings on my rear trailing arms are shot > and need replacing If your 95 has never had its trailing arm bushings replaced they certainly need to be. However in this case you should also see some pulling to one side under hard acceleration too. If the tie rod ends are worn I would expect noticeable slop in your steering. Control arm bushings seem like a possibility. They're relatively easy to inspect. Neil 96 M3
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#2. RE: [E36M3] O2 sensors mixture and performance - from Eric Fesler
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Date: Sat, 10 Aug 2002 08:39:53 -0700 From: "Eric Fesler" <eric@fesler.org> Subject: RE: [E36M3] O2 sensors mixture and performance >#6. RE: [E36M3] O2 sensors mixture and performance - from Andrew-Taylor Autosport >Top >Date: Fri, 9 Aug 2002 17:54:13 -0400 >From: "Andrew-Taylor Autosport" <astaylor@taylorautosport.com> >Subject: RE: [E36M3] O2 sensors mixture and performance ><snip> >> I do not expect that huge horsepower gains are to be >> had from here but >> perhaps a few HP. >> >> Comments? >The O2 sensor is ignored at WOT. Although the Signal from the O2 sensor is ignored at WOT the data that has been gathered from the O2 sensor while driving around prior to going WOT is not ignored. It is collected in the "long term fuel trim" Accordingly, a richer O2 sensor should result in a richer mixture at WOT.
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#3. [E36M3] Re: O2 Sensor Output - from RogRacer@aol.com
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Date: Sat, 10 Aug 2002 12:53:43 EDT From: RogRacer@aol.com Subject: [E36M3] Re: O2 Sensor Output << Date: Fri, 9 Aug 2002 17:54:13 -0400 From: "Andrew-Taylor Autosport" <astaylor@taylorautosport.com> Subject: RE: [E36M3] O2 sensors mixture and performance <snip> > I do not expect that huge horsepower gains are to be > had from here but > perhaps a few HP. > > Comments? The O2 sensor is ignored at WOT. >> This is true but a little misleading. The DME adjustes short-term fuel trims based upon output from the O2 sensor. These STFTs over time migrate to long term fuel trims. And The LTFTs are used at WOT. So, output from the O2 sensor has the potential to affect ultimate power as I understand it. This is true in both OBD 1 and 2 cars. Because it is a long term adaption, it would be hard to modify the O2 sensor output for power gains in any meaningful way. Roger '95 M3...recently changed 02 sensor RogRacer@aol.com
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#4. RE: [E36M3] O2 sensors mixture and performance - from andy radin
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Date: Sat, 10 Aug 2002 10:10:01 -0700 From: "andy radin" <fourfa@fourfa.com> Subject: RE: [E36M3] O2 sensors mixture and performance >> I do not expect that huge horsepower gains are to be >> had from here but >> perhaps a few HP. >> >> Comments? >The O2 sensor is ignored at WOT. Even if it weren't - the O2 sensor is more or less a digital device, not analog. The DME is looking for the frequency of edge transitions compared to what it's expecting. Adding an analog offset would have either no effect, or throw a check engine light for broken O2 sensor. Kind of like playing the digital output of your CD player through an analog EQ to try to boost the treble - just doesn't work that way. andy r. 98 m3/2
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#5. Oil (Again) - from Chuck Hanson
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Date: Sat, 10 Aug 2002 13:00:41 -0600 From: Chuck Hanson <chanson60@comcast.net> Subject: Oil (Again) What weight of Mobil 1 do you guys use in your M3's? I have a '97 and live in a fairly warm climate where it regularly reaches the low 90's during summer months. I occasionally autocross my car in the heat as well. 10W40 seems like it would be about right but of course they don't make one. How about 10W30 vs. 15W50? Chuck Hanson '97 M3/4
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#6. OBC Problem - from Carey Probst
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Date: Sat, 10 Aug 2002 14:58:13 -0400 From: "Carey Probst" <hcprobst@alum.mit.edu> Subject: OBC Problem The top row or 2 rows on the OBC are blank but the rest of the display is fine. I pulled to check for missing lights but all lights appear to be on, just the top part of the display is not working. Any suggestions on if repairable or the OBC is dead? Thanks Carey Probst, '99 M3/2, BMW CCA Patroon and Genesee Valley Chapters Sharked, Stressed, Schrothed, Gauged, Hitched, X-Braced A well regulated militia being necessary to the security of a free State, the right of the people to keep and bear arms shall not be infringed.
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#7. Re: [E36M3] Oil (Again) - from Mdriver13@aol.com
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Date: Sat, 10 Aug 2002 15:25:10 EDT From: Mdriver13@aol.com Subject: Re: [E36M3] Oil (Again) Chuck, I use Mobil 1 15w50 from April to November, and switch to 10w30 in the winter. I autox in the summer too. Otherwise, she's a daily driver. Good luck, Bob Gill 97 ///M3 coupe Philly Region SCCA AS Champion 1997 & 2000 BSP Champion 2001
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#8. Changed pads and ABS/ASC lights on!!! - from Rodriguez, Jorge PDO
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Date: Sat, 10 Aug 2002 15:06:12 -0700 From: "Rodriguez, Jorge PDO" <jorge.pdo.rodriguez@intel.com> Subject: Changed pads and ABS/ASC lights on!!! Hi all: As subject line states, I just changed my pads in preparation for a track day and both the ABS and the ASC lights came on. This is not the first time I change brakes on this car. The only different thing is finally I got a 3/8" torque wrench and torque the drive pins (hex) to 20ft-lb. seemed not enough but I wonder if the calipers are loose. I put PF97's on front and my old (about 1/2 thick) PF90s on back. Replaced Metal Masters I use for everyday driving. Bedding them involved doing 5 to 6 runs at 60mph to 30mph. By the end of the runs the car was mildly pulling left. At low speed, stop and go traffic, letting go of the steering wheel and pressing the brakes made the steering wheel go left. I will re-torque every pin again, but as always any help is always appreciated. regards, Jorge
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#9. RE: [E36M3] O2 sensors mixture and performance - from Matt Henson
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Date: Sat, 10 Aug 2002 15:11:34 -0700 (PDT) From: Matt Henson <hensonator@yahoo.com> Subject: RE: [E36M3] O2 sensors mixture and performance --- andy radin <fourfa@fourfa.com> wrote: > > >> I do not expect that huge horsepower gains are to > be > >> had from here but > >> perhaps a few HP. > >> > >> Comments? > > >The O2 sensor is ignored at WOT. > > Even if it weren't - the O2 sensor is more or less a > digital device, not > analog. The DME is looking for the frequency of > edge transitions compared > to what it's expecting. Adding an analog offset > would have either no > effect, or throw a check engine light for broken O2 > sensor. Kind of like > playing the digital output of your CD player through > an analog EQ to try to > boost the treble - just doesn't work that way. > > andy r. > 98 m3/2 > That's mostly true, except that the frequency of the switching isn't the important thing, it's the swithching itself. One could actually do exactly what the OP was looking for, but it would be pretty complicated. If you used a wide-band O2 (whose output is somewhat proportional to the AFR) then you could also make a system that switches at pretty much any AFR that you want. That's just part of the equation, though, sice changing the switching point will also affect the DME's fuel trims and such. Plus, as it's been noted, the WOT AFR only depends on the DME's map and the fuel trims. To get it to run richer at WOT you'd pretty much have to make it run richer the rest of the time too, which isn't good. You could also try messing with the HFM's output, which only gets you a bit. You really need to know what you're doing before dorking with your car's tuning. In general, the best option is to just get a JimC or a custom chip. -Matt __________________________________________________ Do You Yahoo!? HotJobs - Search Thousands of New Jobs http://www.hotjobs.com
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#10. Re: [E36M3] JimC chips - from Ron Buchalski
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Date: Sat, 10 Aug 2002 19:52:40 -0400 From: "Ron Buchalski" <rbuchals@hotmail.com> Subject: Re: [E36M3] JimC chips Better yet, go to the EPA website and see which areas either must comply with the reformulated gas (RFG) regs, or have agreed to comply: http://www.epa.gov/otaq/rfgarea.htm Read more about RFG at: http://www.epa.gov/otaq/rfg.htm#Fact -rb (having fun in Munich!) >Date: Fri, 9 Aug 2002 13:41:57 -0500 >From: alex.fadeev@verizon.com >Subject: Re: [E36M3] JimC chips > > >Rich Beebe <rich@beebecomm.com> wrote: > > > > what is considered an 'early' chip. i've had a conforti chip > > in my 95 M3 for years and i'm recently experiencing more > > pinging. just curious. > >Rich, >In my experience 'early chip' is a moniker used by less reputable shops to >pimp their own chips. >If your sharked M3 had started pinging recently I would suspect either bad >or oxygenated gas that is becoming prevalent in metropolitan areas all over >the US. If your milage had also recently gone down 5-10%, it is definitely >the oxygenated gas. >Try filling out 50+ miles outside of your city's limits and see if the car >runs better. > >alex f _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com