I had my stock zx3 to 15.6 @ 86(with drag radials 2.2 60ft)
When i launch i hold my ebrake and slip the clutch so everything is preloaded then when the light is on the last amber drop the ebrake slip out of the clutch fully and roll into the gas at the same time. as far as what rpm to slip u have to figure that part out ur self. u dont want to roast the tires but u dont want to bog either. and dont to crazy burnouts either. just a quick spin to clean the tires (if u run street tires).
Also depends alot on where the track is and weather.
Fully Built, Topspeed manifold, CompTurbo: 364hp, 317tq...
^old and Busted^
2011 Mustang GT 5.0 Kona Blue: Bolt On's 440hp, 385tq
'96 F-250 SCEB PowerStroke