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Spec clutches and shims

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Old 10-14-2005, 02:53 AM
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Question Spec clutches and shims

I’ll soon receive a stage 2 Spec clutch, their steel flywheel and a used T56 from a '99 F-body for a tranny swap included the original hydraulics.
PLS don’t tell me to upgrade stuff: I’ll take it as it is and see what happens. The car is a daily drive and I won’t race it either on the road or on the track.
I just want to understand what the function of the shims Spec supplies is.

Is it to set a specific engaging point on the clutch pedal?

Is it necessary to completely disengage the clutch once you apply on the pedal?

Is it necessary to have the proper distance between the throw out bearing and the fingers of the pressure plate?

Thank you - Stefano
Old 10-14-2005, 04:13 AM
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from what ive gathered, the shim's are used if the flywheel are resurfaced. since your using their flywheel, used the thinnest shim they offer to raise your engagement point since it will settle after its been broken in.
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Old 10-14-2005, 04:34 AM
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So it's only about engagement point?
Is it the same as having an adjustable master cylinder?

The stock clutch is self adjusting, how about the Spec? It should also adjust itself during brake in... or not?

Last edited by tici; 10-14-2005 at 04:49 AM.
Old 10-14-2005, 05:33 AM
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Originally Posted by tici
The car is a daily drive and I won’t race it either on the road or on the track.
then why put a spec 2 in it?
boring....these cars are ment to be raced
Old 10-14-2005, 05:48 AM
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hehe! just a little
The meaning was that I won't dump the clutch pedal at 4000 rpm on every start.
Actually this is something I'd never do!

I saw somewhere that I MUST install the upgraded (2000 and up) slave cylinder if I go with stage 3 or 4. Is it true??
Can I install stage 2 on a 99 slave? (pls say yes... )
Old 10-14-2005, 07:27 AM
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I wouldnt, Just go ahead and replace it
Old 10-14-2005, 07:47 AM
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mhhh... the swap kit is already flying over the ocean and a slave costs here much more than in the US...

You wouldn't because it won't work at all or because it's not the best?

What is the difference between the old and new style?
Old 10-14-2005, 09:27 AM
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Sorry, the answer is no. You should be upgrading to the new master and slave.
Old 10-14-2005, 09:37 AM
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No you mean it doesn't work at all? Why?

The dimensions should be the same because you can install the new style on the older tranny... What is the difference?
Old 10-14-2005, 09:40 AM
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We used the SPEC Billet Steel Flywheel when we installed my SPEC stage 3F and used the shims.
Old 10-14-2005, 09:52 AM
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Originally Posted by davered00ss
We used the SPEC Billet Steel Flywheel when we installed my SPEC stage 3F and used the shims.
my new tranny included clutch is still in a crate in North Carolina and will be flown today so I haven't seen the Spec instructions yet

Do they specify what shim to use for which situation (old / new flywheel and so on)?


BAck to my first question: what is the purpose of the shim? Is it to have a specific pedal position when the clutch engages?



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