Over-rev 8AT?

ssrriivv · 07-01-2021, 09:46 PM

Hey guys, not sure if anyone else has experienced this, but I was driving today, in sport+, and I normally am in pure manual mode when i do this, but I guess I had forgotten to bump over the shifter, so it was still in like half-ass manual mode. So i went off a light and short shifted at like 3-4k rpm into second gear, and decided to mash the power a bit, and the car automatically dumped me back into first gear and according to the tac at least, i hit not the rev limiter but like a full 7500 rpm, needle all the way maxed, did my car just nuke itself? I've never seen the car do that, nor did I think it was possible to over-rev an automatic.

overcoil · 07-01-2021, 10:34 PM

first I wonder of a torque converter acts as a power sponge and minimizes downshifts over revving.

if the car on it's own downshifted I highly doubt it did any damage. and a 500 rpm blip over maximum production suggested redline seems well within durability parameters

ssrriivv · 07-01-2021, 10:39 PM

I hope you're right? I'm going nuts over here trying to download ISTA-D and trying to see if there are any codes anywhere. Car still drove fine but I only drove it for a few minutes after. The car did it on its own, but I'm out of warranty now, so even if it's the car's fault and something goes wrong, I'm screwed.

marcthedark · 07-05-2021, 09:25 AM

You sure the actual rev went that high. As the rev counter probably tried to keep up with the jump the inertia could have had the rev indicator still going up while in reality the rev were lover

jzeiler4 · 07-06-2021, 12:00 PM

That is what rev limiters do they cut engine power before you over rev it. If you never felt the engine stutter you are OK. It is possible with a manual to by pass the rev limiter when down shifting to 1st from red line in 3rd though.

MassNerd · 07-06-2021, 12:45 PM

Sounds like when you floor it and hit the down shift paddle. I've noticed this car is poorly programmed for that skip downshift. It goes to the lowest possible gear, but if you are on the gas, why the hell would you want to downshift into a gear that is at or slightly below redline?

Maybe because you were still in auto mode and only temporarily put it in manual with your upshift to 2nd, it got confused and make that same mistake I've noticed.

TINY BMW · 09-21-2021, 06:02 PM

I've done this too. I was in manual sport+, and came to a stop at a red light. Light turned green and I went for it, forgetting the manual stuff.
It cut off at 7,500 RPM.

Look at it this way: the car knows exactly which RPM level you'll end up if you change gears (unlike with a manual).

It won't allow you to do anything stupid. It's even written in the manual.

Finn Germai-Yaz · 09-22-2021, 10:57 AM

Who drives in manual mode all the time?

dradernh · 09-22-2021, 03:06 PM

Quote:

Originally Posted by nawfoo

Who drives in manual mode all the time?

Don't know why exactly, but your question made me think of this guy: https://www.youtube.com/watch?v=b7iUKaPlBl8.

MLJR235 · 09-23-2021, 05:08 PM

Quote:

Originally Posted by dradernh

Don't know why exactly, but your question made me think of this guy: https://www.youtube.com/watch?v=b7iUKaPlBl8.

that video is hilarious

Thanks for the laugh!

dradernh · 09-23-2021, 05:38 PM

Quote:

Originally Posted by MLJR235

Thanks for the laugh!

We aim to please!

07-01-2021, 09:46 PM	#1
ssrriivv Enlisted Member 9 Rep 38 Posts Drives: M240i xDrive coupe Join Date: Nov 2016 Location: St. Louis iTrader: (0)	Over-rev 8AT? Hey guys, not sure if anyone else has experienced this, but I was driving today, in sport+, and I normally am in pure manual mode when i do this, but I guess I had forgotten to bump over the shifter, so it was still in like half-ass manual mode. So i went off a light and short shifted at like 3-4k rpm into second gear, and decided to mash the power a bit, and the car automatically dumped me back into first gear and according to the tac at least, i hit not the rev limiter but like a full 7500 rpm, needle all the way maxed, did my car just nuke itself? I've never seen the car do that, nor did I think it was possible to over-rev an automatic.
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07-01-2021, 10:34 PM	#2
overcoil Major General 3074 Rep 5,577 Posts Drives: M235i 6spd Join Date: Dec 2013 Location: Mid-Atlantic iTrader: (0)	first I wonder of a torque converter acts as a power sponge and minimizes downshifts over revving. if the car on it's own downshifted I highly doubt it did any damage. and a 500 rpm blip over maximum production suggested redline seems well within durability parameters
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07-01-2021, 10:39 PM	#3
ssrriivv Enlisted Member 9 Rep 38 Posts Drives: M240i xDrive coupe Join Date: Nov 2016 Location: St. Louis iTrader: (0)	I hope you're right? I'm going nuts over here trying to download ISTA-D and trying to see if there are any codes anywhere. Car still drove fine but I only drove it for a few minutes after. The car did it on its own, but I'm out of warranty now, so even if it's the car's fault and something goes wrong, I'm screwed.
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07-05-2021, 09:25 AM	#4
marcthedark Lieutenant 120 Rep 410 Posts Drives: M240i xdrive Convertible Join Date: Apr 2017 Location: Phoenix Metro Area iTrader: (0)	You sure the actual rev went that high. As the rev counter probably tried to keep up with the jump the inertia could have had the rev indicator still going up while in reality the rev were lover
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07-06-2021, 12:00 PM	#5
jzeiler4 Lieutenant 319 Rep 533 Posts Drives: 2021 M240i xDrive vert Join Date: Aug 2020 Location: Hazel Green, AL iTrader: (0)	That is what rev limiters do they cut engine power before you over rev it. If you never felt the engine stutter you are OK. It is possible with a manual to by pass the rev limiter when down shifting to 1st from red line in 3rd though.
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07-06-2021, 12:45 PM	#6
MassNerd Second Lieutenant 171 Rep 294 Posts Drives: 2019 M240i Coupe RWD Join Date: Feb 2019 Location: New England iTrader: (0) Garage List 2019 BMW M240i coup ... [0.00]	Sounds like when you floor it and hit the down shift paddle. I've noticed this car is poorly programmed for that skip downshift. It goes to the lowest possible gear, but if you are on the gas, why the hell would you want to downshift into a gear that is at or slightly below redline? Maybe because you were still in auto mode and only temporarily put it in manual with your upshift to 2nd, it got confused and make that same mistake I've noticed.
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09-21-2021, 06:02 PM	#7
TINY BMW Private 18 Rep 85 Posts Drives: 2019 M240i xDrive Convertible Join Date: Dec 2017 Location: Los Angeles, CA iTrader: (0)	I've done this too. I was in manual sport+, and came to a stop at a red light. Light turned green and I went for it, forgetting the manual stuff. It cut off at 7,500 RPM. Look at it this way: the car knows exactly which RPM level you'll end up if you change gears (unlike with a manual). It won't allow you to do anything stupid. It's even written in the manual.
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09-22-2021, 10:57 AM	#8
Finn Germai-Yaz Private First Class 218 Rep 148 Posts Drives: 2017 M240i Join Date: Jan 2019 Location: Las Vegas iTrader: (0)	Who drives in manual mode all the time?
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