Engine cutoff below redline

Brokenbones · 11-29-2021, 08:21 PM

Stock m2c 16k miles. Wanted to rev out engine a bit after endless stop and go traffic
Initially reached redline once in 2nd, but then engine would bog down near 6-6.5k several times afterwards with what felt like fuel cutoff. Could not reach redline again rest of drive. No cel or other warnings.
Never experienced same in S2000 which happily hit redline repeatedly all day long.

Dark-Yoda · 11-29-2021, 11:09 PM

it's the de-tuning of the s55. falls flat after 5300ish rpm.. get a tune

Enabled · 11-30-2021, 07:25 PM

Quote:

Originally Posted by Brokenbones

Stock m2c 16k miles. Wanted to rev out engine a bit after endless stop and go traffic
Initially reached redline once in 2nd, but then engine would bog down near 6-6.5k several times afterwards with what felt like fuel cutoff. Could not reach redline again rest of drive. No cel or other warnings.
Never experienced same in S2000 which happily hit redline repeatedly all day long.

Even stock, the M2C can reach 7500 rpm..

Something is not right. It should still be checked with a diag computer for stored codes. Lack of CEL doesn't mean there are no codes.

FaRKle! · 11-30-2021, 08:17 PM

There's some protection mechanism that limits your redline pulls in lower gears. I'm not sure if it's a DCT thing, or diff thing, but my DCT car will only let me rev out first and second gears a few times in a row before encountering the cutoff you mentioned. In third and above gears I can do constant redline, then coast down, then redline again, then coast down, ect over and over again.

I found this out while breaking in my engine where I'd do gradual pulls to redline, then coast down, and repeat.

pz619 · 11-30-2021, 08:46 PM

I can’t speak to the DCT, but if you can’t rev it out in a manual then something is definitely wrong. If you have the DCT, can you reach redline in “manual” mode?

Enabled · 11-30-2021, 08:51 PM

Quote:

Originally Posted by FaRKle!

There's some protection mechanism that limits your redline pulls in lower gears. I'm not sure if it's a DCT thing, or diff thing, but my DCT car will only let me rev out first and second gears a few times in a row before encountering the cutoff you mentioned. In third and above gears I can do constant redline, then coast down, then redline again, then coast down, ect over and over again.

I found this out while breaking in my engine where I'd do gradual pulls to redline, then coast down, and repeat.

This is interesting. I will investigate on my manual.

FaRKle! · 12-01-2021, 12:10 AM

Quote:

Originally Posted by pz619

I can’t speak to the DCT, but if you can’t rev it out in a manual then something is definitely wrong. If you have the DCT, can you reach redline in “manual” mode?

This was in manual mode. It hasn't happened to me on track though.

bearminimum · 12-01-2021, 12:32 AM

I've had this exact thing happen to me twice very early on in ownership at around 1500 miles. car refused to go past ~6k rpm in 2nd and felt.like it hit a rev limiter from the sound. oil and the car were fully warmed up. I tried it again after letting off the gas and it did it again, after which I decided not to push my luck and shifted into 3rd.

I've never had it happen since then though

Brokenbones · 12-01-2021, 05:32 PM

Quote:

Originally Posted by FaRKle!

There's some protection mechanism that limits your redline pulls in lower gears. I'm not sure if it's a DCT thing, or diff thing, but my DCT car will only let me rev out first and second gears a few times in a row before encountering the cutoff you mentioned. In third and above gears I can do constant redline, then coast down, then redline again, then coast down, ect over and over again.

I found this out while breaking in my engine where I'd do gradual pulls to redline, then coast down, and repeat.

I have manual. Yeah sounds exactly like what happened to me. I was in second gear and could not reach redline again after brief engine braking for traffic after I had run at redline a few times. Hmmm I guess it would help protect the engine or diff? Slightly disappointing

Thanks for reply guys

11-29-2021, 08:21 PM	#1
Brokenbones Private First Class 84 Rep 161 Posts Drives: M2c and S2000 Join Date: Aug 2020 Location: norcal iTrader: (0)	Engine cutoff below redline Stock m2c 16k miles. Wanted to rev out engine a bit after endless stop and go traffic Initially reached redline once in 2nd, but then engine would bog down near 6-6.5k several times afterwards with what felt like fuel cutoff. Could not reach redline again rest of drive. No cel or other warnings. Never experienced same in S2000 which happily hit redline repeatedly all day long. Last edited by Brokenbones; 11-29-2021 at 10:35 PM..
	Appreciate 0 Tweet Quote

11-29-2021, 11:09 PM	#2
Dark-Yoda Private 26 Rep 78 Posts Drives: 2020 BSM M2C Join Date: Mar 2017 Location: LV, NV iTrader: (0) Garage List 2020 M2 COMPETITION [0.00]	it's the de-tuning of the s55. falls flat after 5300ish rpm.. get a tune
	Appreciate 0 Quote

11-30-2021, 08:17 PM	#4
FaRKle! Brigadier General 4041 Rep 3,548 Posts Drives: 328d Wagon, M2 Comp, i4 eD35 Join Date: Sep 2016 Location: Bay Area, CA iTrader: (4) Garage List 2023 BMW i4 eDrive 35 [5.00] 2017 BMW 328dx Wagon [10.00] 2021 BMW M2 Competi ... [5.00]	There's some protection mechanism that limits your redline pulls in lower gears. I'm not sure if it's a DCT thing, or diff thing, but my DCT car will only let me rev out first and second gears a few times in a row before encountering the cutoff you mentioned. In third and above gears I can do constant redline, then coast down, then redline again, then coast down, ect over and over again. I found this out while breaking in my engine where I'd do gradual pulls to redline, then coast down, and repeat. __________________ -328d Wagon Build Log (with helpful reference links) -My YouTube Channel for some of the best DIYs and in depth information Please don't PM me for suspension recommendations unless interested in paid private consultations.
	Appreciate 1 Enabled1424.00 Quote

11-30-2021, 08:46 PM	#5
pz619 Brigadier General 3280 Rep 3,257 Posts Drives: F87 M2C 6MT, Tesla 3 Join Date: Oct 2013 Location: San Diego iTrader: (1)	I can’t speak to the DCT, but if you can’t rev it out in a manual then something is definitely wrong. If you have the DCT, can you reach redline in “manual” mode?
	Appreciate 0 Quote

12-01-2021, 12:32 AM	#8
bearminimum New Member 20 Rep 23 Posts Drives: 21 LBB M2C 6MT Join Date: Jan 2021 Location: Bay Area, CA iTrader: (0) Garage List 2021 BMW M2C [0.00] 2017 VW Golf GTI [0.00]	I've had this exact thing happen to me twice very early on in ownership at around 1500 miles. car refused to go past ~6k rpm in 2nd and felt.like it hit a rev limiter from the sound. oil and the car were fully warmed up. I tried it again after letting off the gas and it did it again, after which I decided not to push my luck and shifted into 3rd. I've never had it happen since then though
	Appreciate 0 Quote