slip the clutch.

I have an issue with the term ``slip'' as I think you're using it here. Most race-type driving professionals I've heard refer to slipping the clutch as the way we use the clutch during normal driving. What I think you're referring to is what they call ``dumping'' the clutch; that is, to just completely lety the clutch pedal go without allowing the cluch plates to slip enough to get the drive axle up to engine speed.