Carl Fausett

Back to the original topic, our clutch kit offerings are about to be expanded, and it falls right on to this thread.

Up until now, we have only had a GT1 and a GT2 clutch package for the twin-disk cars. I had wished we has a full-disk GT3 option I could offer, and I just got the last missing piece of that worked out quite literally yesterday.

I have them coming here so I can photo them for our catalogs.

The full disk option is useful for a driver who wants clutch behaivior very close to stock, a smooth slip, good stop-and-go driving stuff. Our pressure plate will still be stronger than stock, but a full disk friction plate is easier to modulate by the driver.

The 6-puck disks are used to hook-up faster and more surely. All the clamping force of the pressure plate is isolated on a smaller area, so the pounds-per-square inch is higher than when they are distributed over a full disk. With just a little driving (less than an hour) you adapt to a 6-puck clutch as the new "normal" and can street drive it very well.

Still, there is a place for those who want to have the smoother launch of a full-disk.

To help explain, photos below are of a full friction disk and a 6-puck friction disk just for reference.

Carl Fausett

....and for those that do not already know, here is another variable: the sprung center hub vs. the solid center hub.

You can see how a sprung-hub design would take some shock out of the drivetrain, but also adds a delay into the drivetrain. Racers tend to like solid center hubs for more precise tire control, street drivers tend to like the sprung hub for smoother launches and to avoid "chugging" in reverse. Racers don't give a sh*t about reverse, lol)

928er

the full disk above looks exactly like my full face spec stage 3+ discs....... got it thru roger about 1.5 years ago....

Carl Fausett

Yes, Spec had been making 928 clutches for some time before I came along. I did not develop the 928 aftermarket clutch at SPEC. The 928 aluminum flywheels, yes. The clutches, no.

That full disk photo is for a single disk clutch, we have always had that. Perhaps that is what is in your car?

What's new (for us) is the full disk option for the twin-disk cars.

Courtshark

Thanks, Carl. I had a 6 puck clutch like that in my SPG, but didn't love the feel. Could have been something else causing the issue, however (ended up replacing the pressure plate, and using a full disk clutch, but at the same time, so not sure which was causing the issue). Is pricing info available?

Carl Fausett

Our GT2 clutch package for twin-disk cars retails for $1345 and includes the pressure plate and both friction disks.
Here: http://www.928motorsports.com/parts/...kitgt2dual.php

The new GT3 offering will have the same pressure plate, but a pair of full disks. It will be $100 more at $1445. I am taking order for them now, although I do not have them on the website yet.

Deleivery time will be 2 weeks or less, like they are now.

GregBBRD

Carl:

Sounds like you are saying that the full face clutch discs are smooth enough to be used in a street car, without chatter.

Is this a tested product that people can buy and expect to work perfectly for the street?

You are also saying that the 6 puck disc will break-in and be smooth after one hour of driving? Seems like the feedback, on this Forum alone, would make that statement a bit "optimistic"?

Is there some sort of a money back guarantee that these statements are true? It would be a shame to have someone buy/install a clutch that was really made for a race car and plan on it working smooth enough to use on a street car, and not have any recourse, if the pieces are not appropriate for the street. (I've always found these discs to be useful only in race cars, which is why I ask.)

And I don't see any information about torque/horsepower capacity. Can you provide that information, so we can know what is appropriate for our vehicles and have reasonable expectations that what we buy will work with our power output?

Carl Fausett

Greg,

the rated torque limits for each of our clutch packages is posted on the page about that clutch package.

select any one of them here: http://www.928clutch.com/
and the torque limits will display on the one you select.