unless you can get hold of a boost controller which works off an on and off switch then there is no fookin way you'll have time to be playing with a bleed valve, just practice your launching if you have coilovers suspension then jack up the rears and harden them up or just harden if your suspension adjustable, what front tyres are youi using i went from running eagle f1 ds3 to toyo poxyes tr1 there was a huge difference in grip with my new engine and suspension setup and smaller front wheels i am hopein for the high 12s and higher ternimal speed