Rough Shift

theDude · 04-10-2008, 07:43 PM

Just curious if anyone else had had this problem. Specifically, If cruising at ~80mph in 5th gear, in DS mode...flooring it (kick-down) gives me a fairly jarring shift to 3rd.

Much rougher than any other shifts I've experienced at other speeds.

Other than this, the step drives really nice

I'm tempted to go on a test drive with a new 335 to see if I can duplicate this, but figured I'd ask here first. I'm kinda hoping it has more to do with the powerband and shiftpoint, than my transmission (or diff).

Thanks!

asdflkijd · 04-10-2008, 07:50 PM

its because your using kickdown..

doku · 04-10-2008, 08:03 PM

Try this. I did it the other day. I don't know if this will help with what you're feeling, but it wouldn't hurt either.

http://www.e90post.com/forums/showth...t+transmission

e90AW335i · 04-10-2008, 10:41 PM

I will do some testing tomorrow but I believe it has to do with using the kickdown and having more power than stock .....

bimdaddy · 04-10-2008, 10:52 PM

This happenned to me several times on a long 14 hour highway trip. Before this always smooth downshifts. For this particular long trip whether DS or D, when it downshifted to 5th or 4th from about 75-80 mph, the shift was very hard with a thump. I did not activate the kickdown. Up shifts were fine. SSTT giving too much juice to the trans? Maybe not cus ever since the trip I haven't been able to duplicate the hard downshifts. Hmm....

5soko · 04-10-2008, 11:04 PM

haha im sure there are people with more power then your SSTT giving it to the trans. try disconnecting the battery for a hour and re-connect. resets tranny adapting, or just take it in to the dealer.

theDude · 04-11-2008, 08:33 AM

Quote:

Originally Posted by bimdaddy

This happenned to me several times on a long 14 hour highway trip. Before this always smooth downshifts. For this particular long trip whether DS or D, when it downshifted to 5th or 4th from about 75-80 mph, the shift was very hard with a thump. I did not activate the kickdown. Up shifts were fine. SSTT giving too much juice to the trans? Maybe not cus ever since the trip I haven't been able to duplicate the hard downshifts. Hmm....

Well, I never noticed this problem until taking the car for a 4 hour road trip.

My car is totally stock...I have no SSTT or anything else, but it pulls better than I expected 80+ (thump and all).

04-10-2008, 07:43 PM	#1
theDude First Lieutenant 9 Rep 331 Posts Drives: '08 E92 335i Join Date: Jun 2007 Location: Virginia Beach iTrader: (0)	Rough Shift - Steptronic Just curious if anyone else had had this problem. Specifically, If cruising at ~80mph in 5th gear, in DS mode...flooring it (kick-down) gives me a fairly jarring shift to 3rd. Much rougher than any other shifts I've experienced at other speeds. Other than this, the step drives really nice I'm tempted to go on a test drive with a new 335 to see if I can duplicate this, but figured I'd ask here first. I'm kinda hoping it has more to do with the powerband and shiftpoint, than my transmission (or diff). Thanks!
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04-10-2008, 07:50 PM	#2
asdflkijd Aberry is a scammer 584 Rep 5,507 Posts Drives: SGM E92 335i, AM E90 335i Join Date: Jun 2007 Location: Seattle, WA iTrader: (14) Garage List 2008 E92 335i [10.00] 2007 E90 335i (Reti ... [9.00]	its because your using kickdown..
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04-10-2008, 08:03 PM	#3
doku Second Lieutenant 7 Rep 231 Posts Drives: e93 335i Join Date: Apr 2007 Location: Japan iTrader: (0)	Try this. I did it the other day. I don't know if this will help with what you're feeling, but it wouldn't hurt either. http://www.e90post.com/forums/showth...t+transmission __________________ blk sapphire/blk dakota/i-drive/ m-sport pkg/step/Logic HVI/ black grilles/ GP Thunder angel eyes/
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04-10-2008, 10:41 PM	#4
e90AW335i Major General 144 Rep 6,608 Posts Drives: e90 335i Join Date: Sep 2007 Location: ...... iTrader: (4)	I will do some testing tomorrow but I believe it has to do with using the kickdown and having more power than stock ..... __________________ I install all tunes, intakes, o2 simms, and most cosmetic mods. PM me for a quote.
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04-10-2008, 10:52 PM	#5
bimdaddy Major 39 Rep 1,165 Posts Drives: 911 Carrera & G01 X3 Join Date: Feb 2007 Location: MD iTrader: (10)	This happenned to me several times on a long 14 hour highway trip. Before this always smooth downshifts. For this particular long trip whether DS or D, when it downshifted to 5th or 4th from about 75-80 mph, the shift was very hard with a thump. I did not activate the kickdown. Up shifts were fine. SSTT giving too much juice to the trans? Maybe not cus ever since the trip I haven't been able to duplicate the hard downshifts. Hmm.... __________________ 2020 X3 X-Drive 30i; Alpine White/Mocha
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04-10-2008, 11:04 PM	#6
5soko Brigadier General 350 Rep 4,633 Posts Drives: M5 Join Date: Aug 2007 Location: Brooklyn, NY iTrader: (4)	haha im sure there are people with more power then your SSTT giving it to the trans. try disconnecting the battery for a hour and re-connect. resets tranny adapting, or just take it in to the dealer.
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