So I modded an r34 gtr in Assetto Corsa for drag racing.
It has a couple of suspension mods, a hectic grip mod, boost, wg and boost gauge mods, weighs 300 kg less (around 1335kg) and obviously a power mod. Maybe some other crap I can't recall right now.
I found slipping the clutch in first to launch and short changing into 2nd will keep the front end down. It won't do a skid due to grip.
The turbo really comes in at 6k rpm.
Here is the file on dropbox. You go to Steam\steamapps\common\assettocorsa\content\cars\ks_nissan_skyline_r34\data
Backup your data folder and replace it with the modded one.
I managed a 6.999 quarter mile on the back wheels.
Have fun and share your modded cars if you have some.