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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Best way to launch auto 335i?



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      11-02-2012, 08:38 AM   #23
LivnLife31
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What you are really killing is your turbos and brakes! The tranny is not holding the car the brakes are.
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      11-02-2012, 03:33 PM   #24
boostbuddy
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Originally Posted by LivnLife31 View Post
What you are really killing is your turbos and brakes! The tranny is not holding the car the brakes are.
Not brakes. They are static...
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      11-02-2012, 03:41 PM   #25
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Quote:
Originally Posted by pits200 View Post
Locking torque converter so the tranny doesn't see 332ft/lbs of torque.

Now am I saying its good for the transmission, no. But many people take these cars to the strip with hundreds of runs on the auto transmission and I haven't heard of many failures.

Knock on wood.
TC doesn't lock until car is moving, if it were locked you'd stall the engine with the car at a standstill. Most official factory recommendations (across the board, any mfgr.) will tell you not to brake torque the car but you know that anyone who drag races a slushbox does it. What makes it bad is that you are dissipating all of the power that the engine is generating right into the trans fluid because the TC is trying to transmit that power to the rear wheels but you are preventing it from doing so by holding the brake, so literally all of the power that is going into the input of the TC is going right into the fluid that's inside the TC (and consequently, circulating through the tranny.)

So, short answer: don't brake torque any longer than you have to. e.g. don't start until you see the tree starting to count down, unless you're having issues consistently hitting your RPM target and need a little extra time to get it right. In any case, don't do it for any longer than you have to, because the longer you hold the car like that, the more total heat is going into the ATF.

hope that made sense...
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      11-02-2012, 09:54 PM   #26
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Originally Posted by boostbuddy View Post
Not brakes. They are static...
You are hitting the gas and holding the brake at the same time.
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      11-02-2012, 09:58 PM   #27
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Yea I did this shit a few times in the past. Ended up with a red brake sensor warning two months later.
I don't think it is a coincidence.
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      11-14-2013, 09:38 AM   #28
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Yea I did this shit a few times in the past. Ended up with a red brake sensor warning two months later.
I don't think it is a coincidence.
I'll steer clear
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      11-14-2013, 01:20 PM   #29
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Originally Posted by ihc95 View Post
Fair enough. Its your car and not mine. Brake boost all you'd like. I just don't understand the point of putting unnecessary strain on the transmission for a couple tenths at a drag strip or a 0-60 time. To each their own though.
You don't race your car very much. Time is what it is all about.
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      11-14-2013, 02:19 PM   #30
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