Engine shuts down over ~7500rpm

Brainofjjj · 02-09-2026, 09:28 AM

Hi all - haven't posted this build thread here since i've been busy but like many of you i'm building an e92 m3 for track use, not W2W racing but simple track fun. sold my Gt4RS and a GT3 this year and bought an E92 and a GT4.

Anyway, this build is almost done, suspension, exhaust, interior and some aero are on. Engine has the full Do88 kit, Epic tune, intake, and an oil separator , fuel filter, plus new engine covers, has 107k miles. I have not done the TAs, plugs or coil packs yet.

Here's what is happening. Drove it on track for a shake down a few weeks back and when i hit around 7500 rpm, give or take, it went into limp mode, no power and had to coast to a stop, cycle the power and then it ran fine again. I can almost always reproduce this issue on the track or street.

Before i go and replace every part of the ignition and fuel system, starting with plugs, TAs and coils i wanted to run it by you guys. So far i've stumped everyone with this issue as there are no stored codes helping to guide me.

I have not yet tuned it back to stock as Epic Randy suggested but that's my next step just to be sure it's not the tune or to see if throws a code he removed in the tune.

Anyone ever seen something like this?

rcracin · 02-09-2026, 10:09 AM

What are the codes?

Brainofjjj · 02-09-2026, 10:12 AM

Quote:

Originally Posted by rcracin

What are the codes?

No stored codes, all the permanent codes are related the airbags and other items removed or coded for track use. Car runs great, perhaps a bit rich but its catless.

nycplumber · 02-09-2026, 12:24 PM

Could be maybe MAF/O2 sensor or possibly TA.

rcracin · 02-09-2026, 03:01 PM

Quote:

Originally Posted by Brainofjjj

No stored codes, all the permanent codes are related the airbags and other items removed or coded for track use. Car runs great, perhaps a bit rich but its catless.

Did you run it with ista?

You should change plugs regardless. The stock tune idea is probably the best place to start with the least amount of effort.

spammysammich · 02-09-2026, 04:06 PM

This car doesn’t use MAF based fuel tuning. But it does use the spark plugs for ionic knock detection. The wrong plugs or bad/worn plugs can cause misfires bad enough to cut power.

Brainofjjj · 02-09-2026, 06:51 PM

Thanks all. Yeah plugs and packs soon and try the stock tune.

Brainofjjj · 02-13-2026, 01:15 PM

ok, so went back to a stock tune provided by Epic, no issues, no CEL and no cutting of power or limping. Ran the car to redline in 1st through 4th. So odd.
I sent this info back to Randy and will wait. Right now i'll just drive it without the tune.

I was all set to replace plugs, TAs, coil packs and more but right now that's on hold.

02-09-2026, 09:28 AM	#1
Brainofjjj Astronaut 106 Rep 693 Posts Drives: car Join Date: Mar 2008 Location: Dallas iTrader: (5)	Engine shuts down over ~7500rpm - help me diagnose Hi all - haven't posted this build thread here since i've been busy but like many of you i'm building an e92 m3 for track use, not W2W racing but simple track fun. sold my Gt4RS and a GT3 this year and bought an E92 and a GT4. Anyway, this build is almost done, suspension, exhaust, interior and some aero are on. Engine has the full Do88 kit, Epic tune, intake, and an oil separator , fuel filter, plus new engine covers, has 107k miles. I have not done the TAs, plugs or coil packs yet. Here's what is happening. Drove it on track for a shake down a few weeks back and when i hit around 7500 rpm, give or take, it went into limp mode, no power and had to coast to a stop, cycle the power and then it ran fine again. I can almost always reproduce this issue on the track or street. Before i go and replace every part of the ignition and fuel system, starting with plugs, TAs and coils i wanted to run it by you guys. So far i've stumped everyone with this issue as there are no stored codes helping to guide me. I have not yet tuned it back to stock as Epic Randy suggested but that's my next step just to be sure it's not the tune or to see if throws a code he removed in the tune. Anyone ever seen something like this?
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02-09-2026, 10:09 AM	#2
rcracin Major 1277 Rep 1,319 Posts Drives: M3 Join Date: Jul 2012 Location: NYC iTrader: (4)	What are the codes?
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02-09-2026, 12:24 PM	#4
nycplumber Major 790 Rep 1,318 Posts Drives: slow Join Date: Apr 2016 Location: Spring Lake NJ iTrader: (0)	Could be maybe MAF/O2 sensor or possibly TA.
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02-09-2026, 04:06 PM	#6
spammysammich Lieutenant Colonel 3073 Rep 1,799 Posts Drives: 2009 E92 M3 Dakar Yellow II Join Date: Oct 2021 Location: Edmonds, WA iTrader: (0) Garage List 2009 BMW M3 [10.00]	This car doesn’t use MAF based fuel tuning. But it does use the spark plugs for ionic knock detection. The wrong plugs or bad/worn plugs can cause misfires bad enough to cut power.
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02-09-2026, 06:51 PM	#7
Brainofjjj Astronaut 106 Rep 693 Posts Drives: car Join Date: Mar 2008 Location: Dallas iTrader: (5)	Thanks all. Yeah plugs and packs soon and try the stock tune.
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02-13-2026, 01:15 PM	#8
Brainofjjj Astronaut 106 Rep 693 Posts Drives: car Join Date: Mar 2008 Location: Dallas iTrader: (5)	ok, so went back to a stock tune provided by Epic, no issues, no CEL and no cutting of power or limping. Ran the car to redline in 1st through 4th. So odd. I sent this info back to Randy and will wait. Right now i'll just drive it without the tune. I was all set to replace plugs, TAs, coil packs and more but right now that's on hold.
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