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Scorpio
Joined: 05 Jul 2007
Posts: 1957
Location: Brisbane, Australia
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 Posted: Tue Nov 30, 2010 11:50 am Post subject: Clutch Upgrade NA - OEM Vs Audi 200 Vs Spec stage 2+ |
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some pics of the three clutch systems- Spec stage 2+ then audi 200 then Stock clutch
The middle clutch is of the Audi 200 turbo clutch( we think) that came from Andrew NZ... seems to fit as per stock clutch--notice finger sizes-- Ill be using the spec stage 2+ but apparently the audi200 is a direct upgrade to NA (same fit but for a higher torque engine)
The throwout bearing supplied with the spec clutch setup is a good fit but the pilot bearing is too big  or am i missing something??????
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1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT
Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!! |
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flosho
Joined: 01 Jul 2004
Posts: 3160
Location: Eau Claire, Wisconsin
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| Posted: Tue Nov 30, 2010 12:39 pm Post subject: |
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Nice, looks very sexy!
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[This Space For Rent] |
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endwrench
Joined: 07 Dec 2002
Posts: 1631
Location: Victor, Montana
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| Posted: Tue Nov 30, 2010 3:49 pm Post subject: |
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I'd be interested in the torque rating on the Audi 200 clutch and the Spec. Stock is 173 lbs. My "custom" set up is only 235 lbs and was a bit of a pain (but cheap).
http://www.924board.org/viewtopic.php?t=22052&highlight=poor+boys
Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!.... |
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Scorpio
Joined: 05 Jul 2007
Posts: 1957
Location: Brisbane, Australia
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| Posted: Tue Nov 30, 2010 6:58 pm Post subject: |
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dont ko\now about the audi unit but this is the email i got from David Norton at SPEC
Clutches are rated in torque, so for 250 ft lbs + with good clutch life I like st2+ or 3. The small 8.5 diameter is limiting, even with our high clamp load version. The st1 is OK just over 200 ft lbs, but I’d rather help you get into your budget than sell you something that may not live as long as you want. Has the car been on the dyno yet ?
AND
Yes, st2+ would be fine..stage 3 as well. The st3 is plenty streetable, but on the upper end of street aggressiveness, so the engagement will be quicker than a normal fiber based clutch. The st2+ is a hybrid and drives very nicely. So I would choose based on desired engagement feel from a stop..the 2+ will feel more like stock than the 3, but the st3 is still considered a street/track unit.
David Norton
P 800-828-4379 Ext: 110
F 205.491.8593
http://www.specclutch.com
so stage 1= 200ftlb plus and stage 2+ is 15% greater then stage 2
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT
Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!! |
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924-76
Joined: 05 Jun 2006
Posts: 1489
Location: Ontario, Canada
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| Posted: Wed Dec 01, 2010 2:20 am Post subject: |
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Just curious, is there a weight difference between the pressure plat?
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1976 924 N/A ROW SOLD
1980 931S
1981 931 Part car RIP |
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Andrew NZ
Joined: 22 Jun 2004
Posts: 744
Location: New Zealand
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| Posted: Wed Dec 01, 2010 10:21 am Post subject: |
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Can't remember the exact specs, but I had the two tested, and from memory the Audi 200 one was about 30% stiffer than the 924 one.
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Andrew
1977 RX924 race car
12a bridgeport supercharged
www.race4-dcup.co.nz |
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leadfoot
Joined: 11 Dec 2002
Posts: 2222
Location: gOLD cOAST Australia
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| Posted: Thu Dec 02, 2010 6:52 pm Post subject: |
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wouldn't they sell you a red one?
Stu
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress... |
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Scorpio
Joined: 05 Jul 2007
Posts: 1957
Location: Brisbane, Australia
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| Posted: Fri Dec 03, 2010 7:16 pm Post subject: |
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| leadfoot wrote: | wouldn't they sell you a red one?
Stu |
I wish jellyfish.....ah well the clutch is hidden
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT
Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!! |
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CorsePerVita
Joined: 25 Jul 2008
Posts: 1992
Location: Redmond, Oregon
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| Posted: Sun Dec 05, 2010 5:35 am Post subject: |
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how much for the clutches?
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- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS |
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Euro924S2
Joined: 06 Mar 2008
Posts: 215
Location: UK
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| Posted: Sat Dec 18, 2010 8:44 am Post subject: |
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Interesting stuff. I posted on here a while back trying to see what kind of bhp/ torque the standard NA and turbo clutches could handle. Reason being I'm in the middle of a supercharger project on a turbo engine (aim 240bhp) but to go into a NA shell so whilst it's easier to keep the NA sized torque tube and cable clutch etc, there's no point if I'm going to shred it at WOT.
Have you been running your car with a standard clutch and if so what power did it handle?
I have a nearly new standard NA clutch which I'm going to trial just out of curiosity but I'm sure I'll be needing a spec 2.
Can you post up the costs for the spec items?? I'm in UK but good to know.
Cheers. John.
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UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp |
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Sat Dec 18, 2010 9:11 am Post subject: |
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| Euro924S2 wrote: | Interesting stuff. I posted on here a while back trying to see what kind of bhp/ torque the standard NA and turbo clutches could handle. Reason being I'm in the middle of a supercharger project on a turbo engine (aim 240bhp) but to go into a NA shell so whilst it's easier to keep the NA sized torque tube and cable clutch etc, there's no point if I'm going to shred it at WOT.
Have you been running your car with a standard clutch and if so what power did it handle?
I have a nearly new standard NA clutch which I'm going to trial just out of curiosity but I'm sure I'll be needing a spec 2.
Can you post up the costs for the spec items?? I'm in UK but good to know.
Cheers. John. |
For your application, you just need the NA bellhousing with an early 931 TT The clutch splines on the 931 are more common so swapping in a stronger clutch from another vehicle is a little easier.
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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