Engine over rev

Ahmedm1 · 01-26-2021, 03:46 AM

Bmw denied to fix my f80 dct because the motor "over revved". They said the DCT has failed safes that keep the car from doing such thing. But they claim the car did it anyway. What should I do?

CanAutM3 · 01-26-2021, 05:44 AM

This is indeed quite puzzling. I don't see why BMW could deny warranty unless your car was tuned. If you are clean regarding tuning, then I would definitely pursue the matter with them and eventually get a lawyer if needed.

amrazM · 01-26-2021, 06:17 AM

it is possible to over-rev a dct, similar situation to a porsche pdk in some cases.

White340 · 01-26-2021, 06:21 AM

If they claimed the dct had fail safes can they say how you managed to overrev? Wouldn't that make it bmws problem? What's the full story on this anyway? What year,mileage etc. when did the overrev happen according to them and what's wrong with your dct?

CanAutM3 · 01-26-2021, 06:24 AM

Quote:

Originally Posted by amrazM

it is possible to over-rev a dct, similar situation to a porsche pdk in some cases.

Indeed. When Mike Benvo tuned my E92, he got the logs out and had me guess how many times my car was overreved. It was in the hundreds. But they were all relatively small over revs, nothing that would damage the engine. The point is that on a DCT equipped car, it is BMW's own programming that allows these small overrevs, not driver error, and should therefore not be a cause to deny warranty.

Tecnniqe · 01-26-2021, 07:31 AM

Unless you somehow remove or change the rev limiter I don’t see how they could deny fixing it because the car allowed it with failsafes and all.

Weird.

amrazM · 01-26-2021, 07:37 AM

Quote:

Originally Posted by CanAutM3

Indeed. When Mike Benvo tuned my E92, he got the logs out and had me guess how many times my car was overreved. It was in the hundreds. But they were all relatively small over revs, nothing that would damage the engine. The point is that on a DCT equipped car, it is BMW's own programming that allows these small overrevs, not driver error, and should therefore not be a cause to deny warranty.

Cant really assume anything here without further details, OP did not mention what the warranty claim was for.

FrznM · 01-26-2021, 07:50 AM

If you're stock I would definitely expect them to fix any issues under warranty. Time to escalate if needed.

m3elmo · 01-26-2021, 08:04 AM

depends how they define an over rev. in the Porsche world hitting the limiter is over rev 1 vs a bad money shift etc.

MaynardZed · 01-26-2021, 08:45 AM

Quote:

Originally Posted by m3elmo

depends how they define an over rev. in the Porsche world hitting the limiter is over rev 1 vs a bad money shift etc.

Can’t money shift a DCT.

pokerface · 01-26-2021, 08:54 AM

Quote:

Originally Posted by CanAutM3

Indeed. When Mike Benvo tuned my E92, he got the logs out and had me guess how many times my car was overreved. It was in the hundreds. But they were all relatively small over revs, nothing that would damage the engine. The point is that on a DCT equipped car, it is BMW's own programming that allows these small overrevs, not driver error, and should therefore not be a cause to deny warranty.

Out of curiosity, how small is small? Was that a few rpms over readline?

bsmf8x · 01-26-2021, 09:07 AM

What do they have to fix? Motor blew? Regardless, they're crazy, what dealership? I see you're in NJ put them on blast. This is absurd

CanAutM3 · 01-26-2021, 09:46 AM

Quote:

Originally Posted by pokerface

Out of curiosity, how small is small? Was that a few rpms over readline?

0~400rpm over the 8,400rpm max.

deeldoo · 01-26-2021, 10:13 AM

Overreving dct should theoretically be impossible unless something in your coding or maybe something mechanical like your fuel pump or something decided not to fuel starve you in time at redline.

This is on bmw, if you are tuned they can deny you warranty because you are tuned but they are still liable in my opinion as the dct regardless of tune or not has pre built programming to stop redline.

If they said something along the lines of "you tuned your car, too much power, went kaboom" then sure wether you agree or not they have determined the cause and you can go fuck yourself.

Get them to give you a paper stating the car was overreved. Once you have that i am not sure how they can win in court via logic.

1. Diagnosis is overrev
2. Overrev on dct is impossible.
3. Overrev happened
4. Bmw failsafe failed
5. Bmw car failed
6. Fix bmw car

six75LT · 01-26-2021, 10:40 AM

something tells me we're missing some vital info here...

RugbyBro · 01-26-2021, 11:17 AM

OP posted here before with the exact same thread, said he was tuned then the thread was deleted. The tune is likely why BMW won’t cover a fix.

Wmf80 · 01-26-2021, 11:20 AM

Quote:

Originally Posted by RugbyBro

OP posted here before with the exact same thread, said he was tuned then the thread was deleted. The tune is likely why BMW won’t cover a fix.

I felt the same but didn’t want to speak incorrectly.

JPOWER · 01-26-2021, 12:21 PM

My Buddy was denied for an over rev as well but, reality was he was tuned and spun the crankhub. Needless he came out of pocket around $8k with a built head and MAXPSI crankhub fix. Hopefully for OP he doesn't have extensive damage and can be fixed with upgraded Hub Fix

NYG · 01-26-2021, 12:54 PM

Impossible to overrev a dct unless you tuned.

deeldoo · 01-26-2021, 01:00 PM

Quote:

Originally Posted by NYG

Impossible to overrev a dct unless you tuned.

Even with a tune you can't unless you increase the rev limiter

NickyC · 01-26-2021, 01:01 PM

All facts have been clearly stated and not a scintilla of further information is missing from this story.

NYG · 01-26-2021, 01:10 PM

Quote:

Originally Posted by deeldoo

Even with a tune you can't unless you increase the rev limiter

It's ECU controlled. Who knows what/who tuned his car though.

01-26-2021, 03:46 AM	#1
Ahmedm1 Enlisted Member 5 Rep 33 Posts Drives: M3 Join Date: Oct 2018 Location: New Jersey iTrader: (0) Garage List 2018 BMW M3 [10.00]	Engine over rev Bmw denied to fix my f80 dct because the motor "over revved". They said the DCT has failed safes that keep the car from doing such thing. But they claim the car did it anyway. What should I do?
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01-26-2021, 05:44 AM	#2
CanAutM3 General 21115 Rep 20,741 Posts Drives: 2021 911 turbo Join Date: Jan 2012 Location: Montreal iTrader: (1) Garage List 2022 Audi RS6 [10.00] 2021 Porsche 911 turbo [10.00]	This is indeed quite puzzling. I don't see why BMW could deny warranty unless your car was tuned. If you are clean regarding tuning, then I would definitely pursue the matter with them and eventually get a lawyer if needed. __________________ Porsche 911 turbo 2021 992 GT Silver Previous cars: M4cs 2019 F82 Limerock Grey / M4 2015 F82 Silverstone / M3 2008 E92 Silverstone / M3 2002 E46 Carbon Black
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01-26-2021, 06:17 AM	#3
amrazM mTekMods 2139 Rep 2,899 Posts Drives: like a granny. Join Date: Jan 2010 Location: Manhatan iTrader: (1)	it is possible to over-rev a dct, similar situation to a porsche pdk in some cases. __________________ 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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01-26-2021, 06:21 AM	#4
White340 Lieutenant Colonel 1392 Rep 1,986 Posts Drives: 2018 M3 Comp / 2022 X5 45e Join Date: Dec 2015 Location: NYC iTrader: (3)	If they claimed the dct had fail safes can they say how you managed to overrev? Wouldn't that make it bmws problem? What's the full story on this anyway? What year,mileage etc. when did the overrev happen according to them and what's wrong with your dct? __________________ 2022 X5 45e : AW/Tartufo 2018 M3 Competition : AW/SO 2016 340i xDrive : AW/CR (sold)
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01-26-2021, 07:31 AM	#6
Tecnniqe Sad ///M noises 4197 Rep 1,798 Posts Drives: ///M4 COMPETITION Join Date: May 2020 Location: In a Piece of History iTrader: (0)	Unless you somehow remove or change the rev limiter I don’t see how they could deny fixing it because the car allowed it with failsafes and all. Weird.
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01-26-2021, 07:50 AM	#8
FrznM Private First Class 73 Rep 152 Posts Drives: BMW M4 Join Date: Jun 2020 Location: Kansas iTrader: (1)	If you're stock I would definitely expect them to fix any issues under warranty. Time to escalate if needed.
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01-26-2021, 08:04 AM	#9
m3elmo Private First Class 50 Rep 117 Posts Drives: F80 M3 Join Date: Oct 2020 Location: Bay Area, CA iTrader: (0)	depends how they define an over rev. in the Porsche world hitting the limiter is over rev 1 vs a bad money shift etc. __________________ Danny Bay Area, CA
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01-26-2021, 09:07 AM	#12
bsmf8x Lieutenant Colonel 777 Rep 1,636 Posts Drives: F82 Join Date: Jan 2020 Location: NY iTrader: (1)	What do they have to fix? Motor blew? Regardless, they're crazy, what dealership? I see you're in NJ put them on blast. This is absurd
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01-26-2021, 10:13 AM	#14
deeldoo Captain 1122 Rep 845 Posts Drives: BMW M4 - DCT 2016 Join Date: Nov 2019 Location: Toronto iTrader: (0)	Overreving dct should theoretically be impossible unless something in your coding or maybe something mechanical like your fuel pump or something decided not to fuel starve you in time at redline. This is on bmw, if you are tuned they can deny you warranty because you are tuned but they are still liable in my opinion as the dct regardless of tune or not has pre built programming to stop redline. If they said something along the lines of "you tuned your car, too much power, went kaboom" then sure wether you agree or not they have determined the cause and you can go fuck yourself. Get them to give you a paper stating the car was overreved. Once you have that i am not sure how they can win in court via logic. 1. Diagnosis is overrev 2. Overrev on dct is impossible. 3. Overrev happened 4. Bmw failsafe failed 5. Bmw car failed 6. Fix bmw car
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01-26-2021, 10:40 AM	#15
six75LT First Lieutenant 917 Rep 365 Posts Drives: 2020 M4 ZCP Join Date: Feb 2020 Location: USA iTrader: (0)	something tells me we're missing some vital info here...
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01-26-2021, 11:17 AM	#16
RugbyBro Brigadier General 7602 Rep 3,604 Posts Drives: M3 Join Date: Jun 2019 Location: Seattle iTrader: (0)	OP posted here before with the exact same thread, said he was tuned then the thread was deleted. The tune is likely why BMW won’t cover a fix. __________________ Current: F80 Prior: F82, F32
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01-26-2021, 12:21 PM	#18
JPOWER Second Lieutenant 159 Rep 282 Posts Drives: 2015 BMW M4 BLK VERT(F83) Join Date: Oct 2017 Location: NEW JERSEY iTrader: (0)	My Buddy was denied for an over rev as well but, reality was he was tuned and spun the crankhub. Needless he came out of pocket around $8k with a built head and MAXPSI crankhub fix. Hopefully for OP he doesn't have extensive damage and can be fixed with upgraded Hub Fix
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01-26-2021, 12:54 PM	#19
NYG Brigadier General 10680 Rep 3,670 Posts Drives: Audi R8 Join Date: Feb 2017 Location: Brooklyn, NY iTrader: (0)	Impossible to overrev a dct unless you tuned.
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01-26-2021, 01:01 PM	#21
NickyC Lieutenant General 17465 Rep 10,660 Posts Drives: M4 CS. Former G82, x2 F82, F80 Join Date: Nov 2010 Location: Jacked out of my mind iTrader: (23)	All facts have been clearly stated and not a scintilla of further information is missing from this story.
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