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Vman

Single mass flywheel and clutch suggestions

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I have a 99 C2 that had an AASCO 80% grand am spec single mass flywheel with a stock sprung sachs clutch. After less than 5,000 miles including some autocross and track days it is gone. We have not done any big clutch drops, so the local shop thinks having a sprung flywheel and clutch is just not getting enough pressure so it is slipping too much.

The question is what to do next, we have the whole car apart to put in a new motor 997 x51 motor and are going to replace the flywheel and clutch. The car needs to still be drivable on the street, ie. we can't create an on off switch type situation for the clutch engagement, yet we need a better solution than the above.

Any one out there with experience with the Rs spec flywheels and organic linec sachs sport unsprung clutches? How about about using Sach motorsports clutches with metaillic pucks..has any one found any of those streetable?

Thanks,

VM

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I'm running a Sachs stage 2 Race clutch w/LWFW...got it from Kevin @Ultimatemotorwerks...Awesome!

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I have a 99 C2 that had an AASCO 80% grand am spec single mass flywheel with a stock sprung sachs clutch. After less than 5,000 miles including some autocross and track days it is gone. We have not done any big clutch drops, so the local shop thinks having a sprung flywheel and clutch is just not getting enough pressure so it is slipping too much.

The question is what to do next, we have the whole car apart to put in a new motor 997 x51 motor and are going to replace the flywheel and clutch. The car needs to still be drivable on the street, ie. we can't create an on off switch type situation for the clutch engagement, yet we need a better solution than the above.

Any one out there with experience with the Rs spec flywheels and organic linec sachs sport unsprung clutches? How about about using Sach motorsports clutches with metaillic pucks..has any one found any of those streetable?

Thanks,

VM

Check with Austin from TRG. He may be able to help you. He is very knowledgable and supportive.

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Guys thanks for the feedback, I plan on calling TRG and the folks in CO tommorow. How much driveline noise are the folks with stage 2 sachs kits (ie. unspring but full face disc's) experiencing?

I have a 99 C2 that had an AASCO 80% grand am spec single mass flywheel with a stock sprung sachs clutch. After less than 5,000 miles including some autocross and track days it is gone. We have not done any big clutch drops, so the local shop thinks having a sprung flywheel and clutch is just not getting enough pressure so it is slipping too much.

The question is what to do next, we have the whole car apart to put in a new motor 997 x51 motor and are going to replace the flywheel and clutch. The car needs to still be drivable on the street, ie. we can't create an on off switch type situation for the clutch engagement, yet we need a better solution than the above.

Any one out there with experience with the Rs spec flywheels and organic linec sachs sport unsprung clutches? How about about using Sach motorsports clutches with metaillic pucks..has any one found any of those streetable?

Thanks,

VM

Check with Austin from TRG. He may be able to help you. He is very knowledgable and supportive.

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Guys thanks for the feedback, I plan on calling TRG and the folks in CO tommorow. How much driveline noise are the folks with stage 2 sachs kits (ie. unspring but full face disc's) experiencing?

Chatters with the clutch disengaged...loader with AC on. I'm in a cab and it doesn't bother me, but it might bother some. Just engage the clutch and no more sound...or crank up the tunes!

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Okay,after about 3 hours on the phone with the folks from Sachs, FVD, Aasco, TRG, and others here is what I think I know.

It seems the AASCO Aluminum single mass flywheel is the way to go period. Even folks that don't say they use it tend to use it in their kits. Cost about $850-$1000

As far as pressure plates the Sachs Race Engineering High Pressure Plate is the way to go part number 883 082 999 736 Cost about $800-$1000.

As far as clutch plates go the Unsprung Sachs Race Engineering Full Face Organic clutch with metaillic backing part number

881 864 999 957 seems to be the best for the performance oriented driver ie. 20% street 80% track or autox. Its full face makes it streetable, even in unsprung form, but you will have to live with increased driveline noise at idle.

The above parts are good for up to turbo type horsepower, so should work fine for any hot rodded 996 or 997 (yes they are the same parts for 996 and 997).

Issues: some folks prefer to use a sprung clutch with an aluminum single mass flywheel to keep it quiet under idle around town, there is a a school of thought that the spring part helps lessen the load on the tranmission and other parts of the car, the part about being easier on the transmission is not well documented or proven. The folks, like myself that live with sounds in our street legal race cars, are going to go with an unsprung clutch as it has less parts to break, with a full organic face is still streetable, and the clutch weighs in at about 1/2 that of the sprung clutch, less weight = less stress on car. Some folks suggested that even certain 6 puck sintered clutches are streetable and better for track only cars, I am not going to go that route as if a puck clutch breaks it tends to take out things like bell housing which are not replaceable on the 996 transmission.

Watch out for cheap price kits that use light weight flywheels and cheaper sachs sport vs. sachs motorsports (race engineering) parts, they will not have proper pressure plates or use weaker clutch discs.

Good luck,

VM

Guys thanks for the feedback, I plan on calling TRG and the folks in CO tommorow. How much driveline noise are the folks with stage 2 sachs kits (ie. unspring but full face disc's) experiencing?

Chatters with the clutch disengaged...loader with AC on. I'm in a cab and it doesn't bother me, but it might bother some. Just engage the clutch and no more sound...or crank up the tunes!

Edited by Vman

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