Raceboy

Hi!
I'm building a turbocharged 924 with 951 block, 944 S 16v head etc. I'm using S2 flywheel that has 60-2 trigger arrangement and I'd like to know which clutch is the best: strongest and greatest lifetime.

SPEC offers Stage 3+ (holds 475 lb/ft). KEP offers 915 HD pressure plate that holds 477lb/ft but I'm not sure this plate fits to S2 flywheel? I know it fits to 931flywheel though.
Sachs Race Engineering doesn't offer high performance clutch for S2 as far as I know.

What are the other possible options and which one is the best bet?

FRporscheman

If you have the rest of the S2 engine, I want to buy the front crank pulley for the AC/alternator.

My contribution: The 944S/S2 clutch is the same as the 944NA clutch.

JakeS2

You mean the one with the S2's damper?

This is not exactly true. At least for S2 there is difference either in the plate or assembly, I need to double check which one (don't have my PET right here now).

Lemming

I have the spec stage 3 on my track car and I've not had any problems with it. I also run the S2 clutch setup.

Raceboy

My problem is that I intend to boost the engine to 1.4-1.5bars with Holset HX40 and that means around 450whp/600 Nm that is kind of the upper limit of Spec Stage 3+.

I have Spec Stage 3 on my turbocharged euro 924 na 2.0 (this is where the new engine goes) and that has worked flawlessly but on 2.0 924 this clutch is rated at only 380 Nm.

EDIT: I don't have S2 engine, I have only S2 flywheel.

JakeS2

Ok, confirmed. The OEM part number for engine type M44.41 (s2) on pressure plate is different vs. normal N/A. For S2 the number is 944 116 023 07 and for N/A ('88) the number is 944 116 023 01.

FRporscheman

I know the pressure plates are different, but I thought the discs were the same. I could be wrong! And yes, I need the S2 damper front pulley. Have cash, will buy.

Raceboy, there are people on the 951 forum with high power who could give you good advice.

Raceboy

Problem is that I'm not aware of anyone in 951 forums that rund S2 clutch setup I know that for 951 KEP pressure plates seem to be the best ones out there.

But, I could use some real life experience with high-powered car.