Hit rev limiter

Siajoon · 02-07-2019, 07:24 PM

today I hit the rev limiter unintentionally in my car. And the power cut off immediately.

Did I screw anything up? It was a stupid mistake that I've never done since owning this car.. any input would be great!!

Thanks

EJT86 · 02-07-2019, 07:30 PM

The rev limiter A. Is there to prevent damage and B. Is raised to 8600 via many available tunes, so you hitting yours at 8400 is lower than many of us hit

Bimmer Barney · 02-07-2019, 07:39 PM

Quote:

Originally Posted by Siajoon

today I hit the rev limiter unintentionally in my car. And the power cut off immediately.

Did I screw anything up? It was a stupid mistake that I've never done since owning this car.. any input would be great!!

Thanks

Totally fine.

SAMM3Y · 02-07-2019, 07:41 PM

Nah, I've mis-shifted into 2nd instead of 4th before after taccin' out 3rd on the track and it about locked up the back wheels.. just a good ol' fashion drivetrain stress test.. now who wants to buy my car!?!?...

carenthuziast · 02-07-2019, 08:15 PM

Quote:

Originally Posted by EJT86

The rev limiter A. Is there to prevent damage and B. Is raised to 8600 via many available tunes, so you hitting yours at 8400 is lower than many of us hit

How is a tune that allows you to hit 8600 rpm a good thing for the engine since the tune doesn't upgrade any of the mechanical components? The stock redline is there to warn you before you hit the mechanical limits of the materials/components.

carenthuziast · 02-07-2019, 08:18 PM

Quote:

Originally Posted by SAMM3Y

Nah, I've mis-shifted into 2nd instead of 4th before after taccin' out 3rd on the track and it about locked up the back wheels.. just a good ol' fashion drivetrain stress test.. now who wants to buy my car!?!?...

That's one of the positives of having a high rev'ing engine. I too have mis-shifted but from 4th to 3rd (vice 5th) and the tach jumped to 6500 rpm.

Scrippy · 02-07-2019, 08:19 PM

Quote:

Originally Posted by carenthuziast

Quote:

Originally Posted by EJT86

The rev limiter A. Is there to prevent damage and B. Is raised to 8600 via many available tunes, so you hitting yours at 8400 is lower than many of us hit

How is a tune that allows you to hit 8600 rpm a good thing for the engine since the tune doesn't upgrade any of the mechanical components? The stock redline is there to warn you before you hit the mechanical limits of the materials/components.

So when manufacturers make engines they tune them down for reliability. Almost all mass produced motors have more power in them but it comes at a cost if you get greedy. Is that extra 200RPM a breaking point? I say only if you reach 8600 daily like a tardstick.

pbonsalb · 02-07-2019, 08:36 PM

Right — redlines are conservatively set below the engine’s limits. I think Dinan offers an 8600 rpm tune and matches the factory warranty — it’s ok to hit 8600 daily.

Mechanical over revs are another matter. But I have mis-shifted like one of the posters above and dropped to 2nd instead of 4th (but from 6th on the highway) and probably hit about 9000 rpm. Might have locked up the back wheels. Certainly some banging and smoke. That was about 5 years ago and I did change the rod bearings the next year. Car still going strong and I later added that 8600 rpm Dinan tune.

There are those of us who drive these cars and those who preserve them for the next owner. I did not buy to hold for the next guy to enjoy.

Siajoon · 02-07-2019, 08:45 PM

Thanks for the input guys! I feel a bit better now..

I forgot to mention it was not due to mis shifting I revd 1st gear all the way to redline and didn't notice how quickly it got to redline so I didn't shift which led to a fuel cut... just wanted to make sure I didn't cause any damage...

Scharbag · 02-07-2019, 08:58 PM

Quote:

Originally Posted by Siajoon

Thanks for the input guys! I feel a bit better now..

I forgot to mention it was not due to mis shifting I revd 1st gear all the way to redline and didn't notice how quickly it got to redline so I didn't shift which led to a fuel cut... just wanted to make sure I didn't cause any damage...

All good.

Now, try driving a Subaru 2.0l after an M3. I found the rev limiter quite quickly in the Subaru...

amrazM · 02-07-2019, 09:24 PM

The engine is designed to reach the rev limiter ignition cutoff but not live there.

nrubenstein · 02-08-2019, 10:22 AM

If you don’t hit the rev limiter regularly, why the hell would you own an M3????

Montaver · 02-08-2019, 10:57 AM

There is such a sudden drop when you hit the limiter I can see why it might seem like an issue. The ECU throttles it pretty aggressively, keep an eye on those shift lights!

Webb70 · 02-08-2019, 11:59 AM

Quote:

Originally Posted by Montaver

There is such a sudden drop when you hit the limiter I can see why it might seem like an issue. The ECU throttles it pretty aggressively, keep an eye on those shift lights!

lol...Aint no shift lights on a manual !

02-07-2019, 07:24 PM	#1
Siajoon ///Majestic 1860 Rep 2,092 Posts Drives: 2011 E90 ///M3 Join Date: Jun 2010 Location: SoCal iTrader: (1)	Hit rev limiter today I hit the rev limiter unintentionally in my car. And the power cut off immediately. Did I screw anything up? It was a stupid mistake that I've never done since owning this car.. any input would be great!! Thanks
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02-07-2019, 07:30 PM	#2
EJT86 Brigadier General 2383 Rep 3,730 Posts Drives: 2018 M2 Join Date: Mar 2014 Location: Boston, MA iTrader: (0) Garage List [0.00] 2018 BMW M2 [0.00]	The rev limiter A. Is there to prevent damage and B. Is raised to 8600 via many available tunes, so you hitting yours at 8400 is lower than many of us hit
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02-07-2019, 07:41 PM	#4
SAMM3Y Colonel 3085 Rep 2,747 Posts Drives: 2008 m3 Join Date: Feb 2018 Location: NorCal iTrader: (2)	Nah, I've mis-shifted into 2nd instead of 4th before after taccin' out 3rd on the track and it about locked up the back wheels.. just a good ol' fashion drivetrain stress test.. now who wants to buy my car!?!?... __________________ 9ers
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02-07-2019, 08:36 PM	#8
pbonsalb Lieutenant General 5237 Rep 10,616 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	Right — redlines are conservatively set below the engine’s limits. I think Dinan offers an 8600 rpm tune and matches the factory warranty — it’s ok to hit 8600 daily. Mechanical over revs are another matter. But I have mis-shifted like one of the posters above and dropped to 2nd instead of 4th (but from 6th on the highway) and probably hit about 9000 rpm. Might have locked up the back wheels. Certainly some banging and smoke. That was about 5 years ago and I did change the rod bearings the next year. Car still going strong and I later added that 8600 rpm Dinan tune. There are those of us who drive these cars and those who preserve them for the next owner. I did not buy to hold for the next guy to enjoy. Last edited by pbonsalb; 02-07-2019 at 09:17 PM..
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02-07-2019, 08:45 PM	#9
Siajoon ///Majestic 1860 Rep 2,092 Posts Drives: 2011 E90 ///M3 Join Date: Jun 2010 Location: SoCal iTrader: (1)	Thanks for the input guys! I feel a bit better now.. I forgot to mention it was not due to mis shifting I revd 1st gear all the way to redline and didn't notice how quickly it got to redline so I didn't shift which led to a fuel cut... just wanted to make sure I didn't cause any damage...
	Appreciate 0

02-07-2019, 09:24 PM	#11
amrazM mTekMods 2148 Rep 2,906 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	The engine is designed to reach the rev limiter ignition cutoff but not live there. __________________ 2011 Frozen Black/Fox Red E90 M3 650+WHP G-Power Supercharged First DCT to Manual Conversion Worldwide KW CS, BBS RI-A, BW Headers, Snow 2.5
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02-08-2019, 10:22 AM	#12
nrubenstein Captain 567 Rep 801 Posts Drives: E30 M3/E36 M3/E46 M3/E90 M3 Join Date: Dec 2016 Location: Washington, DC iTrader: (2)	If you don’t hit the rev limiter regularly, why the hell would you own an M3???? __________________ 2011.75 E90 M3 \| 2006 GMC Sierra LBZ \| 2004 X5 3.0i 6MT \| 1995 M3 S50B32 \| 1990 325is \| 1989 M3 S54B32 Hers: 1996 911 Turbo \| 1989 325iX
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02-08-2019, 10:57 AM	#13
Montaver Lieutenant Colonel 2187 Rep 1,667 Posts Drives: G87 M2 & M340i LCI Join Date: Jul 2017 Location: NY iTrader: (0)	There is such a sudden drop when you hit the limiter I can see why it might seem like an issue. The ECU throttles it pretty aggressively, keep an eye on those shift lights!
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