Hi:

I have a 2006 997S and just installed a VF 510 Supercharger. (See pic). I need a new clutch. I had some folks recommend a stage 2+, pn SP903H-3 or a stage 2 Sach clutch or a Sach Racing Setup. Some recommended I keep a stock clutch. The car is my DD but I track 2 maybe 3 times a year at most.

My stock dual mass flywheel does not need replacing but I was thinking about popping in a LWFW as the labor won't be any extra just another $1000 for the part. I have some folks say that this is worth it the car will be much more responsive. Other say its a waste and it will change the feel of the car. Thoughts?

Any insights will be greatly appreciated!!!!

 

anyone?

 

stock na motor maybe but with a blower I wouldn't do it. I've had friends put on turbo cars and was always broken

 

Stay with the stock flywheel.

Word is that our motors are not balanced well enough from the factory to deal with a LWFW. Installing one would be opening the door for possible trouble, including a broken crank. Not worth the risk for a bit more push.

By the way, I'd love to take a ride in your SC'ed 997. Must be an impressive boost over stock?

 

thanks for the information! if you're near pdx I'll give you a lift. the SC is great when it really starts to bite at 5-7rpms

 

Info from David Norton with Spec Clutches when I asked him about his recommendation for my RUF R-Kompressor car should the current unit fail at some point.

"I like our stage 2+, which is a full faced version. It will hold more than you are putting down, drive very nice and wear extremely well. This is what I used on my forced induction (n/a) ’04 996. The clutch kit part number is SP903H-3 ."

When RUF supercharges an engine they do a neat trick of installing thicker head gaskets, which effectively lowers the compression a little. As mk3boy alludes to, adding forced induction to a normally aspirated motor at the originally high compression ratio will put some additional stresses on it, for which it was not designed.

The attached PDF shows all the parts of the RUF Supercharger kit. Anything that appears in color is a non-OEM engine part so you can see it's very extensive.

 

You might want to test out aftermarket clutches before you pull the trigger, most of them from my experience are heavy and doesn't feel good compared to stock clutches. I have a TPC turbo on mine and have been running on stock clutch for 5 years now w/o a problem.

 

Just out of curiosity (and if you don't mind telling) how much did it cost parts/labor to have the supercharger installed?

 

thanks for the input. the supercharger is $10k retail. I bought mine from a guy off 6speedonline who bought it new then didn't install it because he wanted to buy a 911. I got it for $6500 I believe. Then it costs about $2200 to install it (some places quoted as much as $3700). So I have about $8900 into it. My kit came with the third radiator as well.

 

Turbo kit is 10K and installation is 3K FYI

 

Need a clutch for a 2006 997S RUF Kompressor Conversion. Any suggestions?

 

See my posts below. I haven't had to change mine yet, but that's probably what I'll go with when I do. Assuming your car has the same type of supercharger engagement mine does, avoid going with a lightened flywheel - you'll need that rotating mass to keep things smooth.

 

Sorry to hear that. You just picked up that car no? Maybe ask the dealer to pitch in a bit; unlikely but maybe ask. RUF supports Ruf owners so may suggest contacting them in Germany via email and take their advise.

 

One of my previous 993's had a supercharger and I installed a beefed up clutch and a LWFW. The heavier clutch is needed for obvious reasons. The lighter clutch allowed the car to accelerate ever faster but the down side was when coming off of the throttle there was not enough mass to keep the engine from stalling. So I had to blip the throttle (very gently) when the rpm's approached zero. No big deal as it became second nature. I'd go for it and take advantage of the SC.

 

The RUF superchargers, which are special ASA units don't work like normal superchargers. They have clutches in them that engage once the unit reaches a certain centrifugal force value. This is what accounts for the slightly less than smooth takeoff if you try to pull away from a stop slowly, but not quite slowly enough. This can be reduced significantly by disabling the clutch position switch and by going to semi solid motor mounts (RSS, Rennline, Wevo, etc).

But a lightened flywheel is going to exagerate the amount of engagement you feel from this particular supercharger.

Also, I just completed Jake's and Tony's online education M96/M97 engine course. When you have the transmission off, pull the deal from the larger IMS bearing in your car so the bearing will get some splash lubrication.