Imagine sitting on a level surface with the engine idling and you put the shifter into first gear with the clutch in. Now imagine you start to let the clutch out very slowly ... to the point where it
almost starts to grab.
You should be able to visualize the car starting to tug forward. You should also be able to visualize that if you let the clutch out the rest of the way (without any throttle!) the car would stall.
THAT is the point of slipping the clutch.
Now imagine that same scenario with the engine racing at 5500-6500 rpms and you are slipping (controlling) the clutch to get the power down to the ground. If you do it too fast you are either going to spin the tires (too high of an RPM) or bog yourself with not enough power to get into boost (too low of an RPM).
If you let the clutch out too slow you will most likely bog and/or stall ... or just lose a LOT of time.
The trick is to ride the sweet spot where
you are controlling the power to the ground. A 2wd, manual, turbo 4-cylinder is one of the hardest cars to launch well. No one ever said it was easy. Only in my last 20-30 drag races have I finally really started to get it ... and I have over 130 passes on my car.
When you nail it perfectly, it looks like this:
http://www.jekylhyderacing.com/image...easystreet.mpg