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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sun, Oct-22-2017, 03:33:15 PM   #21
StevePhillips
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Default Re: E36 m3 5.5k rpm loss of power when hot

If you haven't already, just for fun, pull out your diff speed sensor and inspect it. We had an E36 M3 race car here that the trigger wheel came loose and cleaned out the sensor. Car was fine until higher rpm and then like clockwork would fall on it's face and run lean. ONly takes a second to pull it and see if it is melted or broken.
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Old Mon, May-14-2018, 06:05:07 PM   #22
kuzimmer
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Default Re: E36 m3 5.5k rpm loss of power when hot

Was there any resolution to this???

I'm tagging onto this thread because I have a similar problem. Please advise if I should start a new thread.

I don't have an M3 but I have a 2.8 M52 with M3 cams. At our last endurance race weekend, the car ran beautifully on Friday and Saturday, then on Sunday it just went flat at 5500 rpms.

We had a mis-shift on Saturday and video shows an over-rev of 8k rpms. Compression and leak-down tests seem pretty normal for a 150k mile engine. A scope of each cylinder showed no signs that there was any valve to piston contact.

So we took the car to the dyno. Oddly on some runs the car had full power, but on most runs the car acted as if you were lifting off the throttle slightly above 5500 rpm. The car runs smoothly at all rpms.


I have some images of dyno runs here: https://photos.app.goo.gl/MELn33vp1JpeZ3wH7. Of particular interest are runs 28-29-30 which were run with the Vanos solenoid unplugged. Runs 28 and 29 look pretty darn good up top. Our dyno guy suggested one more run (30) without any changes and that is the green run on the image with runs 28, 29 & 30. WTH?

We are now trying to figure out how to attack this without just throwing parts at it, but also not making a bunch of trips to the dyno as its a three hour round trip.

We do have known good coils and a known good computer with a different tune for the same engine mods (Conforti/Turner vs the Epic tune that is in the car now). We could go back to the dyno and borrow an obd-II logger and and check for IAT and Coolant Temp irregularities while testing the coils and computers.

The vanos is clearly working. Could it have anything to do with the high rpm randomness? I did rebuild it last year, but assuming I didn't, could it be the cause? It seems unlikely to me.

I know cam and crank sensors could change the timing, but again this seems odd.

Suggestions on how to proceed are appreciated.

Thanks,

Kurt
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Old Tue, May-15-2018, 12:49:52 PM   #23
Double E
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Default Re: E36 m3 5.5k rpm loss of power when hot

Kurt, You're running in AER?
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Old Tue, May-15-2018, 02:28:15 PM   #24
kuzimmer
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Default Re: E36 m3 5.5k rpm loss of power when hot

LuckyDog in the Northwest.
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Discussing E36 m3 5.5k rpm loss of power when hot in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)