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      01-13-2013, 08:20 AM   #22
CanAutM3
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Quote:
Originally Posted by sensi09 View Post
It appears to me that a high rpm shift in say in S5 or S6 would have minimal clutch slip (less wear on the clutch disc), but would be harsher on the drivetrain in general

Being stuck in traffic and slow shifts in lower modes would have more clutch slip and wear on the discs. Other than launch control, high rpm shifts in S1-S2 (maybe auto mode too) should have the most slip and wear on the clutch discs.
Wear is function of both the slip time and the force applied.

As an example, think of sanding a surface. If you don't apply much force, you are not removing much material with each pass and you need to sand longer. However if you increase the force, more material gets removed much faster, i.e. more wear.

The worst case would be a long clutch engagement time with high forces being trasmitted. As you stated, launch control is an example where the clutch slips while the engine is at max power.