Here are the opinions of about 200 people (good poll):
https://www.evolutionm.net/forums/sh...d.php?t=126768

 

Keep in mind, all the clutches are rated for an estimated torque capacity, not horsepower... and its torque to the flywheel, not to the wheels... so you add in a 20% drivetrain loss formula into the mix and you get a decently higher number.

ACTMan, I have a few questions for you... (semi-thread hijacking):

1. The Xtreme series, what's the rating on the pressure plate?
2. The XTSS, what's the torque capacity on it?
3. The XTR6, what's the torque capacity on it?

Trying to figure out if its the XTSS or XTR6 that I'd want for a 500wtq+ setup (on a GT35R)... and comments?

 

If its street driven, just get an ACT organic...Forget about all of that expensive nonsense.

 

To answer your questions:
1. Pressure plate tests about 3600lbs (about 20% stronger than our HD)
2. About 600ftlbs peak
3. About 770ftlbs peak

Usually our numbers are conservative if anything. We calculate torque using dynamic friction (slipping torque), not static friction (clutch already locked). Keep in mind also that dynos vary a lot and how you drive has a huge affect on torque capacity. Clutches hold a lot more torque once locked up than they do trying to lock up. Heat is going to affect the organic clutch more than the puck, but adjustment issues are going to be more of an issue with the street clutch. There are always tradeoffs.

 

i have the spec stage 3 with my gt35 kit, love it

 

I truely never understood the "stage" terminology that's universally associated with every clutch made...

 

Yup, ACT has great prices for their quality!

 

10 reasons for our selection:

I say tilton hybrid for it's reasonable price for the highest quality twindisc 1, less than 2/3 of the weight of the ACT and many others 2, 7.25" OD will rev faster, shift quicker 3, the hydraulic release bearing will give you lighter than stock pedal effort unlike a 2950lb+ pressure plate with a high clamping PP 4, typical throwout bearings in an Evo application have a short life, (tilton does not use this config) 5, no shift lockouts I have ever heard of with this low enertia, high quality unit 6, dual stainless steel braided lines all the way to the master cylinder for precise engagement 7, hydraulic release bearing self adjusts for discwear 8, comes with new lightweight clutch hardware 9. Removal of the clutch slave cylinder is part of the install on a tilton which will further reduce the weight of the car 10.

I tuned a car Sunday night with an ACT 2950 and I heard it grind syncros at least twice. We did not install the clutch and yes we do sell the clutches.

I would say we know how to drive by the 140 passes on the stock clutch at 1.72 60' avg.

I have a tilton hybrid in stock as well as a full carbon carbon. Unlike some others, we won't recommend a twin carbon for a daily driver that rarely visits the dragstrip. Overkill.