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Join Date: Apr 2003
Location: Carnation, WA
Posts: 623
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Best Clutch Discs?
So which clutch is everybody using?
After only 9,000 miles mine is starting to slip, I put in a new cable this weekend thinking that the old one might have been binding, but it still slips under hard acceleration. I can't believe this clutch is failing already. This was the $400 Sachs Sport Spring centered clutch disk model #88186-615.
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David |
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02-25-2007, 11:19 AM
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Location: MA USA
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Hi David,
I am using a KEP stage 1 with a stock disk. I really like it. No slippie and it feels stock except it is a little harder to push down.
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Dean 911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno, |
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02-25-2007, 01:37 PM
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With a little research I can only find a few options for pressure plates
Centerforce/ kit Kennedy (KEP 930), plus Sachs disc Sachs aluminum (my current setup) They all run about $1000 Anybody have any more options or opinions on the pressure plate choices?
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David |
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02-26-2007, 08:05 AM
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I think that's about it. I've got a Centerforce now, but I don't have enough miles to give feedback. I'll be trying the Kennedy next.
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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02-26-2007, 11:49 AM
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Location: Australia
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Send your own pressure plate out to to be rebuilt. I had mine rebuilt with heavier tension and use the stock spring centered clutch plate. I can hold mine at 7k and drop the clutch with no slip at all, just two black lines down the road. It does feel a little harder tp push the pedal in but my wife can drive it fine, and she's 5ft and 55kg.
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In Heaven… the mechanics are German, the chefs are French, the police are British, the lovers are Italian and everything is organized by the Swiss. In Hell…the mechanics are French, the police are German, the chefs are British, the lovers are Swiss and everything is organized by the Italians. |
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02-26-2007, 12:06 PM
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David,
Spec and Clutchnet and two more options I think. Search on them.
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Dean 911 SC turbo, 3.0L 930 motor, G50, 930 brakes, DTA EFI, 352 RWHP DynoDynamic dyno, |
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02-26-2007, 02:40 PM
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Location: Carnation, WA
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Just got the car on jacks this evening and the oil is running out... with any luck the engine and trans will be out by the weekend. Got some advice to send the pressure plate to SPEC for modification.
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David |
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02-26-2007, 05:56 PM
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Clutch Masters chrarged me $580 to rebuild my stock pressure plate and friction disk for serious abuse. They tweak the fulcrum point of the belvil spring on the pressure plate and then I got a 4 puck, ceramic, and sprung friction disk. This setup works great, clutch is a little mean in a traffic jam, but not bad and I beat the ba!!$ off it.
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Kris @ Tech9 86' 930/GT-40R Sold  94' Rustang GT daily (long gone) 2008 C6/Z51 Corvette |
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02-26-2007, 07:11 PM
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Stay away from the SPEC Stg3+... it's not very street friendly at all
 It gets easier over time, but that's just because your foot becomes educated. For a first timer, it's pure HELL
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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02-26-2007, 11:37 PM
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Quote:
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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02-27-2007, 05:20 AM
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Got the engine and trans out yesterday. Clutch disc doesn't look really badly worn but it has what looks like tiny heat cracks in it. The pressure plate and flywheel both have yellow and bluish streaks where the metal has gotten really hot.
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David |
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03-04-2007, 01:50 PM
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My flywheel had major cracks, it really wasn't a question. I wouldn't worry too much about yellow and blue since we know they get super hot. Are there any grooves or cracks?
I got my car back yesterday, I've put a little over 100 relatively hard miles on it and so far the Centerforce hasn't slipped.
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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03-04-2007, 03:01 PM
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The flywheel doesn't have cracks but has slight grooving, pressure plate looks ok, definately heat cracks in the clutch disc. I am sending it all to SPEC tomorrow. How does the Centerforce feel at the pedal?
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David |
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03-04-2007, 06:45 PM
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Quote:
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Williamknightperformance.com Perfectpower.com |
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03-04-2007, 07:07 PM
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Was yours sprung? They did some good $#it to mine, Im sure it will hold what Ill give it (hopefully 600+).
Now I know you drag your car- in your opinion, do you think that the 4 puck ceramic will be good for this? let me know what you think.
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Kris @ Tech9 86' 930/GT-40R Sold 94' Rustang GT daily (long gone) 2008 C6/Z51 Corvette |
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03-04-2007, 07:24 PM
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1979 Porsche 930 3.4
2002 Porsche 996TT
