RPM shifting

moparwedden said

OK I'm finally going racing, need to know what I should be shifting at. 72 Duster with full uniform, 4 speed, Center force dual friction clutch, 8 3/4 rear end with 410, large u-joint. 440 around 525HP. 255/60/15 drag radials. I was told too leave at 2500 but where should I be shifting after that, Crane fire ball with built in limiters, where should these be set at, do not want to break it right off the bat. this is just for fun.

Thanks.

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There are two ways to do this, dyno the car or pick a shift RPM (say 5000) and increase is 250rpms per pass and see what the timeslip says.

You launch RPM is solely dependant on 2 things. Traction and RPM limit of what the engine can take. I like to launch stick cars on a limiter so i'd highly recomend getting a 2 step for your launches. There are about 8 million things all happeneing at once when you approach the line combined with about 8 grams of adrenaline. The less you have to think about as the light start dropping the better....