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How are you guys launching? Would the best technique be, pumping the throttle to stay out of vacum and build boost. I'm running the stock rear with MT ET Streets.
Trans brake...
Im at 4psi by 3000rpm with my 88mm turbo......
It will keep rising with RPM and even more with a 2 step.
A 2 step would be the way with a car without a transbrake.