Qiuz: which spins first...
07-29-2004, 01:34 PM
#1
Banned
Thread Starter
Qiuz: which spins first...
On a sufficiently powered 951, which spins first - brand new Michelin pilot sport 275's/LSD or a new OEM clutch. I'll give you 2 guesses. 
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07-29-2004, 02:09 PM
#5
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Rennlist Member
Rennlist Member
I have always wondered, what is the torque rating of the standard clutch (or any clutch that we install for that matter)?
It should be relatively simple to measure off-line, namely clamp the disc and use a big torque wrench to measure what it takes to turn it.
I have on occasion asked aftermarket manufacturers about this number (Centerforce included) and they are unacceptably vague about it.
The clutch should be able to hold at least 20% more than the engine can deliver, so for a 350 WTQ car, the clutch should be able to hold at least 1.2 * 350 / .85 = 494 ft-lb.
Pressure plates are typically non-linear so the pressure force (torque holding capability) is constant throughout the life of clutch until the minimum thickness is reached, at which point the pressure drops rapidly and the clutch slips.
It should be relatively simple to measure off-line, namely clamp the disc and use a big torque wrench to measure what it takes to turn it.
I have on occasion asked aftermarket manufacturers about this number (Centerforce included) and they are unacceptably vague about it.
The clutch should be able to hold at least 20% more than the engine can deliver, so for a 350 WTQ car, the clutch should be able to hold at least 1.2 * 350 / .85 = 494 ft-lb.
Pressure plates are typically non-linear so the pressure force (torque holding capability) is constant throughout the life of clutch until the minimum thickness is reached, at which point the pressure drops rapidly and the clutch slips.
