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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > lauch control jb4??



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      02-08-2013, 11:16 AM   #1
e_a_u_c
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lauch control jb4??

i have a n54 w the jb4 b5 auto and i will like to add lauch control is there any way to do it??? thanks
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      02-08-2013, 11:43 AM   #2
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      02-08-2013, 11:44 AM   #3
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Quote:
Originally Posted by e_a_u_c View Post
i have a n54 w the jb4 b5 auto and i will like to add lauch control is there any way to do it??? thanks
There is no launch control feature for JB4 only a 2-step which is only for manual transmission.

you should just do a 2nd gear launch.
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      02-08-2013, 12:52 PM   #4
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thanks for th info
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      02-08-2013, 01:08 PM   #5
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other than user defined boost setting by rpm or gear, your right foot will be the launch control module
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      02-08-2013, 03:24 PM   #6
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put your foot on the brake and slightly get on the gas till about 2600rpm or until your car is about to start moving forward and hold it down until you want to launch or the light turns green and let your foot off the brake and put your right foot all the way down the the floor. Make sure you turn traction control off. And thats your launch control
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      02-10-2013, 11:06 AM   #7
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put your foot on the brake and slightly get on the gas till about 2600rpm or until your car is about to start moving forward and hold it down until you want to launch or the light turns green and let your foot off the brake and put your right foot all the way down the the floor. Make sure you turn traction control off. And thats your launch control
Is it save Doing this? Will it damage the gearbox?
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      02-10-2013, 12:08 PM   #8
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Frequent power braking will cause an early failure. Once & awhile you might get away with it. Drag racing specific autos have high stall speed torque converters that do not load the gear box preventing excess heat buildup. That being said all the really quick 135i/335i autos are starting in 2nd gear since a hard launch in 1st will only fry the tires.
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      02-10-2013, 09:41 PM   #9
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thanks for the info, so start in 2nd and try to build some boost by breaking
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