Problem launching steptronic in 2nd....input needed!!

jetblack07 · 02-23-2012, 05:15 PM

Ok here's the situation. Just got some drag radials on and decided to go out and practice some 2nd gear launches. When I rev up to 2k and let off the brake and push the throttle all the way to the kickdown point car launches perfect. No wheel spin or anything. The problem is when I get to about 4-4.5k I feel a clunk and it shifts to 3rd gear on it's own. It's not letting me take it all the way to 6k and my foot is to the floor. It doesn't do it in 1st gear and it doesn't do it if I just roll into the throttle. I'm puzzled...this happen to anyone else?

Beemw335 · 02-23-2012, 05:35 PM

That doesnt sound good, but Ive never heard of it shifting on its own in m2 before redline???
Good luck.

zeel · 02-23-2012, 05:50 PM

Pretty weird. Could be tranny related?

jetblack07 · 02-23-2012, 06:21 PM

That's what I'm thinking....it has to have happened to someone else.

themyst · 02-23-2012, 06:49 PM

Weird, 1st gear is known to shift short but never heard of 2nd gear doing it. No tranny error on the dash? Would it be possible to take a video of this happening?

You could reset transmission adaptations by holding the accelerator down all the way for 30 seconds with ignition on, engine off. Worth a shot.

jetblack07 · 02-23-2012, 07:07 PM

Yeah I'll post one up...not really sure how...

jetblack07 · 02-23-2012, 07:10 PM

I've got the code clearing on in jb4...should I disable that to se if it throws a code?

Beemw335 · 02-23-2012, 07:54 PM

Yes, but check codes, you probably have transmision code a or b which wont throw any warnings, c or d will have lights in in the dash.

BavanaghCndra · 02-23-2012, 08:05 PM

it has to have happened to someone else

jetblack07 · 02-23-2012, 08:33 PM

I was tinkering around under the hood and found that my blow off valve hose that goes to the intake tube had blown off. I guess I didn't put it on tight enough when I installed the meth elbow I purchased from themyst...took it out for a test drive...problem solved. I don't know if the fsb on the meth kit/jb4 intervened and kicked the meth off and dropped boost to factory levels which caused the tranny to upshift or what but...fixed!

Bash · 02-24-2012, 04:02 AM

Learn something everyday...nice

Velocity26 · 02-24-2012, 08:19 AM

If you are testing, I would love for you to try a few 1st gear launches with the Drag Radials and see how that compares to 2nd gear launches. Most people bypass 1st gear since there is not enough traction to utilize it, but the Drags might make the difference, they have for others: http://www.e90post.com/forums/showthread.php?t=652589

jetblack07 · 02-24-2012, 01:14 PM

See link below

http://www.e90post.com/forums/showthread.php?t=652815

02-23-2012, 05:15 PM	#1
jetblack07 Second Lieutenant 4 Rep 222 Posts Drives: 2007 335i Join Date: Mar 2011 Location: Dover, De. iTrader: (1)	Problem launching steptronic in 2nd....input needed!! Ok here's the situation. Just got some drag radials on and decided to go out and practice some 2nd gear launches. When I rev up to 2k and let off the brake and push the throttle all the way to the kickdown point car launches perfect. No wheel spin or anything. The problem is when I get to about 4-4.5k I feel a clunk and it shifts to 3rd gear on it's own. It's not letting me take it all the way to 6k and my foot is to the floor. It doesn't do it in 1st gear and it doesn't do it if I just roll into the throttle. I'm puzzled...this happen to anyone else? __________________ 07 335i sedan AT 414rwhp/446rwtq jb4, raceland, dci and meth... 12.06@117 with a 1.91 60'
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02-23-2012, 05:35 PM	#2
Beemw335 Colonel 62 Rep 2,013 Posts Drives: 335i Join Date: Mar 2011 Location: My car is my home iTrader: (2)	That doesnt sound good, but Ive never heard of it shifting on its own in m2 before redline??? Good luck.
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02-23-2012, 05:50 PM	#3
zeel Lieutenant 14 Rep 579 Posts Drives: 08 AW e92 335i Join Date: Nov 2010 Location: MD/NOVA/DC iTrader: (2) Garage List 2008 bmw e92 335i [7.34]	Pretty weird. Could be tranny related? Last edited by zeel; 02-23-2012 at 05:53 PM.. Reason: nvm not kickdown... saw it was goin to 3rd...no clue on this one
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02-23-2012, 06:21 PM	#4
jetblack07 Second Lieutenant 4 Rep 222 Posts Drives: 2007 335i Join Date: Mar 2011 Location: Dover, De. iTrader: (1)	That's what I'm thinking....it has to have happened to someone else. __________________ 07 335i sedan AT 414rwhp/446rwtq jb4, raceland, dci and meth... 12.06@117 with a 1.91 60'
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02-23-2012, 06:49 PM	#5
themyst Major General 177 Rep 6,631 Posts Drives: '16 MK7 GTI Join Date: Feb 2009 Location: NYC iTrader: (8)	Weird, 1st gear is known to shift short but never heard of 2nd gear doing it. No tranny error on the dash? Would it be possible to take a video of this happening? You could reset transmission adaptations by holding the accelerator down all the way for 30 seconds with ignition on, engine off. Worth a shot. __________________ E90 LCI N54 6AT
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02-23-2012, 07:07 PM	#6
jetblack07 Second Lieutenant 4 Rep 222 Posts Drives: 2007 335i Join Date: Mar 2011 Location: Dover, De. iTrader: (1)	Yeah I'll post one up...not really sure how... __________________ 07 335i sedan AT 414rwhp/446rwtq jb4, raceland, dci and meth... 12.06@117 with a 1.91 60'
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02-23-2012, 07:10 PM	#7
jetblack07 Second Lieutenant 4 Rep 222 Posts Drives: 2007 335i Join Date: Mar 2011 Location: Dover, De. iTrader: (1)	I've got the code clearing on in jb4...should I disable that to se if it throws a code? __________________ 07 335i sedan AT 414rwhp/446rwtq jb4, raceland, dci and meth... 12.06@117 with a 1.91 60'
	Appreciate 0 Quote

02-23-2012, 07:54 PM	#8
Beemw335 Colonel 62 Rep 2,013 Posts Drives: 335i Join Date: Mar 2011 Location: My car is my home iTrader: (2)	Yes, but check codes, you probably have transmision code a or b which wont throw any warnings, c or d will have lights in in the dash.
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02-23-2012, 08:05 PM	#9
BavanaghCndra New Member 0 Rep 12 Posts Drives: bmw Join Date: Feb 2012 Location: gty iTrader: (0)	it has to have happened to someone else __________________
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02-23-2012, 08:33 PM	#10
jetblack07 Second Lieutenant 4 Rep 222 Posts Drives: 2007 335i Join Date: Mar 2011 Location: Dover, De. iTrader: (1)	I was tinkering around under the hood and found that my blow off valve hose that goes to the intake tube had blown off. I guess I didn't put it on tight enough when I installed the meth elbow I purchased from themyst...took it out for a test drive...problem solved. I don't know if the fsb on the meth kit/jb4 intervened and kicked the meth off and dropped boost to factory levels which caused the tranny to upshift or what but...fixed! __________________ 07 335i sedan AT 414rwhp/446rwtq jb4, raceland, dci and meth... 12.06@117 with a 1.91 60'
	Appreciate 0 Quote

02-24-2012, 04:02 AM	#11
Bash First Lieutenant 8 Rep 395 Posts Drives: E92-335i Join Date: Jan 2011 Location: Beirut iTrader: (0)	Learn something everyday...nice __________________ COBB S2+ - Mr.5 CAI, Catless DP, Catless MP, AMS FMIC.
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02-24-2012, 08:19 AM	#12
Velocity26 Resident old fart 146 Rep 575 Posts Drives: 2010 335i M-Sport Join Date: Oct 2011 Location: Florida iTrader: (4)	If you are testing, I would love for you to try a few 1st gear launches with the Drag Radials and see how that compares to 2nd gear launches. Most people bypass 1st gear since there is not enough traction to utilize it, but the Drags might make the difference, they have for others: http://www.e90post.com/forums/showthread.php?t=652589
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02-24-2012, 01:14 PM	#13
jetblack07 Second Lieutenant 4 Rep 222 Posts Drives: 2007 335i Join Date: Mar 2011 Location: Dover, De. iTrader: (1)	See link below http://www.e90post.com/forums/showthread.php?t=652815 __________________ 07 335i sedan AT 414rwhp/446rwtq jb4, raceland, dci and meth... 12.06@117 with a 1.91 60'
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