if you really want a good launch for manual car with turbo, find
out when your turbo kicks in, or tune it to desired level. once u
clutch in just before the biting point, press the accelerator to
the desired rpm level before the turbo kicks in, change gear
simultaneously. Remember not to throw e clutch on release. Find out
yr gear ratios. Most important.. practice, practice, practice. LSDs
do help a lot for cars with too much power.