sallyman1

when trying to build boost before racing does everyone press hard on brake and push accelerator about half way down? wont you snap u joints doing that? or how do most videos you see what r the guys doing b4 leaving?

jrussell

A boosted launch is the fastest by far because you eliminate any and all turbo lag. It's not recommended to do boosted launches on a stock tranny though. You can probably get away with 10psi or less on the stock trans, but don't try 15-20psi launches unless you have a built trans.

sallyman1

do you need a tranny brake and what is a tranny brake? is it just locking and unlocking the torque converter through a switch of some sort?

tritont

no you don't need a brake.... that is unless you're pushing a crap load of hp. The higher the boost you build the harder it is on the brakes but, they hold to at least 20psi in my experience anyway. Once I get up around 20 I can feel them giving and it's harder to hold the line. I think anymore boost and a trans brake would be needed.

You have a lot of other things to concern yourself with if you plan to race.

sallyman1

no i dont wanna race. i just saw some burnout videos on youtube.com

tritont

you should be able to do burn outs without a problem with a completely stock truck. Just build your boost while braking to just under 10psi and let off. You tires should break loose.

Not a recommended thing to do though.... you trans won't like it one bit.

trik396

A trans brake locks first gear and reverse gear. I have never heard of a diesel truck using one because they are VIOLENT when released. They are generally used on lightweight drag cars. My guess is the most stout trans all billet will frag something if you used a trans brake and left with 20lbs of boost.

CReed

I was able to do 20psi boosted launches with my stock trans once my converter got loose enough to let me stall it up to 2500rpms and 20+psi and was cutting 1.70 60fts all day long. I would not recomend this though as I was not the norm just trying to find the limits.