Clutches

[Longitudinal]

What recommendations would you all make for upgraded clutches? Has SPEC fixed its quality problems from a few years ago? Phoenix? Centerforce?

Let's say 400lb-ft limit on a street car.

[John V]

Spec didn't change the spring--the diaphragm..sop rellay no increased clamping force..400 ft/lbs Hmmmm I'd use Kennedy Engineering Stage 4 228mm pressure plate and a 4 or 6 puck sinter puck thing..

It'd call for a different bolt circle and some sort of stand-offs to get the height right..6 bolys on a equidistant bolt circle...
Fortunately...there IS some guy around that does those, and I hear he even made some steel flywheels since cast iron can ----and sometimes does--explode.

Now, as usual you didn't say how you're doing 400 ft/lbs, and how the car will be used or you budget..
Because 400 ft/lbs is a LOT and it will be expensive period and harder if you want to Oh say..drive it on the road..

Why not come back and invest some time typing some details so the answers can be tailored better???

[Longitudinal]

Spec didn't change the spring--the diaphragm..sop rellay no increased clamping force..400 ft/lbs Hmmmm I'd use Kennedy Engineering Stage 4 228mm pressure plate and a 4 or 6 puck sinter puck thing..

It'd call for a different bolt circle and some sort of stand-offs to get the height right..6 bolys on a equidistant bolt circle...
Fortunately...there IS some guy around that does those, and I hear he even made some steel flywheels since cast iron can ----and sometimes does--explode.

Now, as usual you didn't say how you're doing 400 ft/lbs, and how the car will be used or you budget..
Because 400 ft/lbs is a LOT and it will be expensive period and harder if you want to Oh say..drive it on the road..

Why not come back and invest some time typing some details so the answers can be tailored better???

A highly typical John V response... I didn't know you had read and responded enough of my posts to have the data to say "as usual."

Notice please that I said "limit," not "goal."

John, save yourself some typing and don't bother responding to my posts.

[m2motorsport]

AP do a clutch kit for the Sierra and RS 500,CP2015-9, 6 paddle ceremetallic good to 351ft lbs, they say not recommended for street use but with the possibility of 400ftlbs nothing is going to be the unicorn clutch...

[jkxr4ti]

Take a look at stinger performance. They have some good kits that go up to 400 ish torque.

http://www.stinger-performance.com/suspensionparts.html

http://forum.turboford.org/cgi-bin/ulti ... u=00003314


I bought mine from pyropete125 over on turboford. It's comparable to the stage 4 on stingers site. It's a solid 4puck sintered bronze disk and higher clamp load pressure plate. It's been very reliable. Definitely takes a bit of getting used to and not for someone looking for a mild clutch. That being said my car is mainly a street car and I have no issues with the clutch. On the dyno it listed about 315 wheel torque.

[Longitudinal]

Take a look at stinger performance. They have some good kits that go up to 400 ish torque.

Stinger's pics are of SPEC clutches.