If they lay down the stuff they have been this summer at the Pod, you wont find wheelspin a problem. If you were running a paddle clutch youd basically just experiment to find the revs at which you could dump the clutch and get the tyres to bite. On a normal clutch youll have to be a bit less harsh. Best bet is to get down your local industrial estate in the dead of night and practice...it can get quite complicated but essentially if you get off the mark with a little chirp from the tyres thats perfect. Any less revs and youll bog down - in other words your hook-up with the road is too much for the power your car is putting down, revs will drop and you will be well out of the power band. On the other hand if you launch with too many revs, you will wheelspin, which is wasted power. Its getting the balance that is the tricky bit. That advice from no1girlracer is spot on though, dont try and race anyone, unless you want to. Just sit at the line until your ready to go, theres no time penalty at all, you are timed from when you start moving.