I took a turn really fast and my car revved...it's an automatic

N54Society · 10-31-2018, 02:13 AM

I took a hard right turn getting off the freeway and heard my engine rev. I was in normal "D" mode but either I've never driven this car hard like that before or I've never noticed it before. Is my car broken or is this a safety feature? DSC is on.

Thanks

N54Society · 10-31-2018, 01:02 PM

Bump

CTinline-six · 10-31-2018, 01:15 PM

How high did the engine rev? Was it a redline type of rev or more like a downshift?

max_330i · 10-31-2018, 01:19 PM

Sounds like no more hard right turns for you

BimmerNugget · 10-31-2018, 01:19 PM

I've felt something similar like this too in my RWD 328i auto. Happens especially on uphills and downhills. Happened more often after I installed the BMS PBX. I guess it's the computer downshifting to keep you in a lower gear for max acceleration. Keep in mind these transmissions learn and adapt to your driving style.

Needbmwpartzz · 10-31-2018, 01:25 PM

Were u in DS mode?

nsjames · 10-31-2018, 04:26 PM

did the engine rev and you went faster, or did the engine rev and you didn't accelerate?
one is normal, one is your transmission slipping.

if slipping, check fluid level first. Especially if it happens during an aggressive turn, the pickup may have become exposed, pump sucked air, you lost line pressure, clutches slipped.
that will damage a transmission if you allow it to happen.

N54Society · 10-31-2018, 09:52 PM

Quote:

Originally Posted by CTinline-six

How high did the engine rev? Was it a redline type of rev or more like a downshift?

I didn't really feel much engagement but it revved up to like 4k RPM. Maybe a downshift?

Quote:

Originally Posted by BimmerNugget

I've felt something similar like this too in my RWD 328i auto. Happens especially on uphills and downhills. Happened more often after I installed the BMS PBX. I guess it's the computer downshifting to keep you in a lower gear for max acceleration. Keep in mind these transmissions learn and adapt to your driving style.

I think you may be right about this. I was breaking and accelerating if that makes sense.

Quote:

Originally Posted by Needbmwpartzz

Were u in DS mode?

No. Just D.

Quote:

Originally Posted by nsjames

did the engine rev and you went faster, or did the engine rev and you didn't accelerate?
one is normal, one is your transmission slipping.

if slipping, check fluid level first. Especially if it happens during an aggressive turn, the pickup may have become exposed, pump sucked air, you lost line pressure, clutches slipped.
that will damage a transmission if you allow it to happen.

Good question. I didn't feel like anything was engaging but I was also likely braking at that point. It all happened really fast. What can I do to refresh the auto transmission?

Thanks

unrulyteach · 10-31-2018, 09:59 PM

Isn't the e9x tranny sealed?

robthewrench · 11-01-2018, 06:51 AM

Even though stability control was on, you can still get wheelspin and high RPMs. Once the DSC senses the loss of traction it will use the ABS to control the wheelspin (and you get the flashing yellow traction light).

I think you lost traction on the hard right (not uncommon) and the RPMs went up until either you regained traction or stability control used the ABS to stop the wheelspin.

nsjames · 11-01-2018, 02:06 PM

Quote:

Originally Posted by unrulyteach

Isn't the e9x tranny sealed?

no, it just doesn't have a dipstick.

there are fill/drain plugs.

335's have a ZF transmission that requires a new pan to change the filter.

change the pan/filter and fill it with new fluid.
then after a day drain and fill it again.
that will get 80% of the old fluid out.
https://www.rmeuropean.com/bmw-e90-3...id-change.aspx

you may want to service the mechatronic seal while you're there as well.

Fritzer · 11-01-2018, 03:34 PM

Reset your throttle.

-Car off
-Key in slot
-No foot on brake, turn car on until dash lights up/aircon starts
-put throttle all the way to the floor, until you feel it pressing the button
-hold for 30 seconds
-let throttle off, ignition off, key out
-wait two minutes then start the car

Should fix issues like this happening, sounds like your transmission just had a wonky downshift from the signals your throttle was sending to it.

N54Society · 11-10-2018, 02:15 AM

Quote:

Originally Posted by Fritzer

Reset your throttle.

-Car off
-Key in slot
-No foot on brake, turn car on until dash lights up/aircon starts
-put throttle all the way to the floor, until you feel it pressing the button
-hold for 30 seconds
-let throttle off, ignition off, key out
-wait two minutes then start the car

Should fix issues like this happening, sounds like your transmission just had a wonky downshift from the signals your throttle was sending to it.

Finally got around to doing this. Let's see if it changes things.

illbtm · 11-10-2018, 03:14 AM

Did you find a solution?

N54Society · 11-10-2018, 03:37 AM

Quote:

Originally Posted by illbtm

Did you find a solution?

I just reset it a couple of hours ago. I'll be driving the car tomorrow since it's past midnight right now.

N54Society · 11-11-2018, 04:08 PM

Quote:

Originally Posted by illbtm

Did you find a solution?

It did the trick for me! My shifting is much smoother even when it's cold. Thanks Fritzer

Fritzer · 11-11-2018, 05:02 PM

So I take it the throttle reset fixed your issues? Great little trick to freshen up the throttle, especially after it learns "driving habits" in a couple days of bad traffic.

N54Society · 11-11-2018, 09:37 PM

Quote:

Originally Posted by Fritzer

So I take it the throttle reset fixed your issues? Great little trick to freshen up the throttle, especially after it learns "driving habits" in a couple days of bad traffic.

Yes, your steps to reset throttle worked well. Shifting is much smoother.

Fritzer · 11-11-2018, 11:13 PM

Quote:

Originally Posted by vbp6us

Yes, your steps to reset throttle worked well. Shifting is much smoother.

Glad to hear it!

N54Society · 11-12-2018, 10:27 PM

So I just tried to do the same thing and this time I actually committed to throttling around the turn and guess what? It revved up until I lifted without acceleration! I can't believe this. My car has 75k miles on it, never been modded, etc. I'm beginning to think it's slipping.

Checking the fluid tomorrow.

CTinline-six · 11-13-2018, 02:01 PM

Quote:

Originally Posted by vbp6us

So I just tried to do the same thing and this time I actually committed to throttling around the turn and guess what? It revved up until I lifted without acceleration! I can't believe this. My car has 75k miles on it, never been modded, etc. I'm beginning to think it's slipping.

Checking the fluid tomorrow.

I don't think it is slipping to be honest. I think it is just downshifting for you. Mine does the same thing on a certain hill I take driving to work. It depends on how I brake whether it will do it or not.

N54Society · 01-02-2019, 04:40 PM

UPDATE: I've replaced the transmission pan/filter, gasket, new fluid - 8qt Mercon SP, mechatronic plastics like sleeve adapter, and few more plastics sandwiched behind the mechatronic unit.

All of my shifting issues have gone away. Nothing but smooth shifting.

10-31-2018, 02:13 AM	#1
N54Society Major Private First Class 450 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	I took a turn really fast and my car revved...it's an automatic I took a hard right turn getting off the freeway and heard my engine rev. I was in normal "D" mode but either I've never driven this car hard like that before or I've never noticed it before. Is my car broken or is this a safety feature? DSC is on. Thanks __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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10-31-2018, 01:02 PM	#2
N54Society Major Private First Class 450 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	Bump __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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10-31-2018, 01:15 PM	#3
CTinline-six Hoonigan 6894 Rep 3,001 Posts Drives: '09 328i, '98 Wrangler Join Date: Dec 2016 Location: Connecticut iTrader: (0) Garage List 2009 BMW 328i N51 [0.00]	How high did the engine rev? Was it a redline type of rev or more like a downshift? __________________ "Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should." -Dr. Ian Malcolm, Jurassic Park
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10-31-2018, 01:19 PM	#4
max_330i Captain 340 Rep 922 Posts Drives: 2006 BMW 330i Join Date: Apr 2016 Location: Illinois iTrader: (0)	Sounds like no more hard right turns for you __________________ 2006 330i 6MT Jet Black / Black
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10-31-2018, 01:19 PM	#5
BimmerNugget Crazy Frog 543 Rep 1,212 Posts Drives: L.L.Bean Bootmobile Join Date: Jun 2017 Location: 560 State Street iTrader: (0)	I've felt something similar like this too in my RWD 328i auto. Happens especially on uphills and downhills. Happened more often after I installed the BMS PBX. I guess it's the computer downshifting to keep you in a lower gear for max acceleration. Keep in mind these transmissions learn and adapt to your driving style. __________________ www.youtube.com/watch?v=k85mRPqvMbE
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10-31-2018, 01:25 PM	#6
Needbmwpartzz Colonel 854 Rep 2,793 Posts Drives: 2009 bmw 328i x-drive Join Date: Feb 2014 Location: Kitchener/Waterloo iTrader: (0)	Were u in DS mode?
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10-31-2018, 04:26 PM	#7
nsjames Brigadier General 2443 Rep 4,330 Posts Drives: 08 328xi Touring Join Date: May 2017 Location: ohio iTrader: (0)	did the engine rev and you went faster, or did the engine rev and you didn't accelerate? one is normal, one is your transmission slipping. if slipping, check fluid level first. Especially if it happens during an aggressive turn, the pickup may have become exposed, pump sucked air, you lost line pressure, clutches slipped. that will damage a transmission if you allow it to happen.
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10-31-2018, 09:59 PM	#9
unrulyteach Colonel 392 Rep 2,367 Posts Drives: 2011 335i Join Date: May 2016 Location: myrtle beach sc iTrader: (0) Garage List 2011 BMW 335i [0.00]	Isn't the e9x tranny sealed?
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11-01-2018, 06:51 AM	#10
robthewrench Captain 266 Rep 952 Posts Drives: 11 E90 335i Join Date: Aug 2014 Location: Columbus OH iTrader: (0)	Even though stability control was on, you can still get wheelspin and high RPMs. Once the DSC senses the loss of traction it will use the ABS to control the wheelspin (and you get the flashing yellow traction light). I think you lost traction on the hard right (not uncommon) and the RPMs went up until either you regained traction or stability control used the ABS to stop the wheelspin. __________________ bone stock
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11-01-2018, 03:34 PM	#12
Fritzer No one sleep in Tokyo 945 Rep 1,507 Posts Drives: 2011 E90 328i//1995 E34 530i Join Date: Oct 2018 Location: San Diego, California -> Austin, Texas iTrader: (3)	Reset your throttle. -Car off -Key in slot -No foot on brake, turn car on until dash lights up/aircon starts -put throttle all the way to the floor, until you feel it pressing the button -hold for 30 seconds -let throttle off, ignition off, key out -wait two minutes then start the car Should fix issues like this happening, sounds like your transmission just had a wonky downshift from the signals your throttle was sending to it. __________________ 2011 E90 328i, 1995 E34 530i, 1992 E32 740i, 1991 E34 525i
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11-10-2018, 03:14 AM	#14
illbtm Registered 0 Rep 4 Posts Drives: E90 320d Join Date: Nov 2018 Location: Asia iTrader: (0)	Did you find a solution?
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11-11-2018, 05:02 PM	#17
Fritzer No one sleep in Tokyo 945 Rep 1,507 Posts Drives: 2011 E90 328i//1995 E34 530i Join Date: Oct 2018 Location: San Diego, California -> Austin, Texas iTrader: (3)	So I take it the throttle reset fixed your issues? Great little trick to freshen up the throttle, especially after it learns "driving habits" in a couple days of bad traffic. __________________ 2011 E90 328i, 1995 E34 530i, 1992 E32 740i, 1991 E34 525i
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11-12-2018, 10:27 PM	#20
N54Society Major Private First Class 450 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	So I just tried to do the same thing and this time I actually committed to throttling around the turn and guess what? It revved up until I lifted without acceleration! I can't believe this. My car has 75k miles on it, never been modded, etc. I'm beginning to think it's slipping. Checking the fluid tomorrow. __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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01-02-2019, 04:40 PM	#22
N54Society Major Private First Class 450 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	UPDATE: I've replaced the transmission pan/filter, gasket, new fluid - 8qt Mercon SP, mechatronic plastics like sleeve adapter, and few more plastics sandwiched behind the mechatronic unit. All of my shifting issues have gone away. Nothing but smooth shifting. __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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