924Board.org

[Carrera RSR]

Need to fit a new clutch in my 931 soon and considering a Fidanza aluminium flywheel. I understand the following

Pros - lighter torque weight = quicker reving, more power available

Cons - easier to stall when pulling away

I am sure there are more. I've heard of some but no substantiation. Please enlighten me ideally with experience rather than hearsay.

Thanks
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
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[ideola]

BE CAREFUL. I don't think there are ANY Fidanza's that will work on the 931 DESPITE what you may see advertised on FleaBay or other online resellers. I've looked into this pretty thoroughly, even to the point of sending detailed photos, measurements, and specifications to the manufacturer. They confirmed with me that they don't have a suitable piece for the 931. Now, having said all of that, it might be possible that the ones listed will work on the late S2 cars that have the dished flywheel designed to work with the 924S/944 style rubber damped clutch disc (in the US, that would be really late 1982 only). But that is only my theory, and as far as I know has not been confirmed by anyone, including Fidanza. All of the gory details are here: http://www.924board.org/viewtopic.php?t=29167
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erstwhile owner of just about every 924 variant ever made

[Carrera RSR]

Thanks Dan

Whats your understanding on clutch compatibility on the S1 v's S2. Finding it hard to find a spring damped S1 clutch but plenty of the rubber damped 931 S2/944S/944S2 versions around. I searched and found several threads on Bronco clutches (no thanks!).
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252

[ideola]

AFAIK, if you don't have the dished S2 style flywheel, you need the spring-damped clutch disc.

I am really on the fence about trying one of the HD Bronco discs. I think I have two brand new 931 clutch discs at home. I might consider selling one of them for the price of an HD Bronco disc if you're unable to find a 931 disc on your side of the pond.
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erstwhile owner of just about every 924 variant ever made

[Carrera RSR]

So with an S2 flywheel an S2 clutch plate, pressure plate and release bearing will fit an S1?

Whats the benefit of a S1 spring damper over an S2 rubber damper?
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252

[Cedric]

[Carrera RSR]

I understand that some of the clutch parts are shared with early 911's. However I haven't nailed which. Even the largest parts suppliers in the UK don't have knowledge of the differences between 924 Turbo v's 924 na let alone which 911's share parts.

Found this with 'fast road' parts. Listed for the Carrera GT so I guess the same as S2??

http://www.performanceclutch.co.uk/p0/924-carrera-gt-1980-1985/233014.htm
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252

[ideola]

Yes, but there is yet another S2 flywheel that is deeply dished that will not work with the pressure plate and clutch that you have. I can't speak authoritatively for ROW cars, but in the US, the 1981 S2 has the same style pressure plate and clutch disc as S1. Sometime in 1982, they were changed over to the deep dish style. I don't know for a fact that it coincided with the beginning of 1982 production, so I'm being careful...all I can say for sure is that there was a changeover that appeared to have happened sometime in 1982 on US cars. I believe peterld in Australia had some comments or notes about this as well relative to late S2 ROW cars.

Also, I believe that the all aluminum 915 pressure plate is not direct bolt-on, but there was a hybrid version that is. I happen to have one that is going onto the UWB project, and can confirm it is identical to the 931 cover in terms of dimensions. FWIW, the 915 pressure plate purportedly offers 2x clamping power over the 931 unit, so whether you get the hybrid alu-iron version or an all iron version, it's a good choice for higher output setups.
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erstwhile owner of just about every 924 variant ever made

[Cedric]

Thats weird, i thougth the s2s all had the same clutch setup. My engine is from a 81 car, and it has a really deep dish design.
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1980 924 Turbo
www.instagram.com/garagecedric/

[ideola]

Have a look:
http://www.924board.org/viewtopic.php?t=21820
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erstwhile owner of just about every 924 variant ever made

[Carrera RSR]

My ideal plan would to replace the pressure plate (lightweight & high clamping load), clutch plate(fast road/track), release bearing and possibly a lightweight flywheel. As long as all parts are compatible I don't care too much where they came from.

I am looking at S2 Sachs 'OEM' clutch kits from £450 to fast road options at £700. But no S1 options. For the S2 options to work I guess I will need a S2 flywheel.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252

[ideola]

Hold on a sec...

...I don't think you can use the 915 pressure plate with the late S2 flywheel. If you want to use the lighter weight, higher clamping force pressure plate from the 915, you have to stick with S1 or early S2 flywheel and clutch disc. If you want to change over to late S2, why don't you just get a complete setup for a 924S or early 944? You'd need the pressure plate, disc, pilot & throwout bearings, and the flywheel. But you'd have more aftermarket options with the latter, despite not being able to use the 915 pressure plate...
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erstwhile owner of just about every 924 variant ever made

[thirdgenbird]

ive got a fidanza in my 924s. here is what i have noticed:

1. starting takes a little more gas and care (you will adapt quickly)
2. it feels like it revs quicker
3. it drops revs very fast (i recommend heal toe downshifts)
4. more drivetrain noise (no more steel to dampen noise)

all said, i am happy with the purchase. i dont mind the noise at all and have gotten used to the different feel.
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17in caymans, koni yellow coilovers, hypercoil springs, kla solid upper mounts, 968 sway bars, kla drop links, kla strut brace, fidanza flywheel, dansk catback, wilwood front calipers, ss brake lines, e-codes, 944 duckbill, manual rack,momo steering wheel

[emoore924]

I'm about to drop a fidanza into one of my builds. I will report out once I have an impression to share...

[ideola]