Steven C.

OK A couple of things. First the clutch pedal in my car is very heavy according to me and every other "Porsche guy" that has driven it. I assume it is the pressure plate as it is my understanding that this is why Porsche added the assist to the turbo clutch? I drove a new boxter the other day and the clutch felt like a toy car compared to mine. Now mine does grow chest hair for you when you drive it but enough is enough of this stuff! So, with the following modifications can a standard pressure plate and clutch handle this car:

993 intakes and MAS
993 cup cams
Fabspeed dual exhaust
lighter(soon to be a little heavier)flywheel
cat bypass
adjustable fuel pressure regulator

My left leg thanks you in advance.

On the flywheel, how heavy is heavy enough? Fidanza is selling a 14 lbs. one that they say will solve the problem. How will the 10.5 lbs. Porsche one work? At 7.5 lbs for the current one in my car and just problems with the AC on how far do I need to go? Adrian, I think your book says 19 lbs. but do I really need to go this far?

Thanks again,
Steve

Adrian

Dear Steve,
Do not get mixed up. Porsche just used a slightly larger slave cylinder for the 964 Turbo.
It was the 993 Turbo that got the boost assist to the hydraulic clutch using the power steering system.
You make your own decisions on how heavy a flywheel you think you need. I have provided my recommendations (also Andial's), if you wish to go lighter that is your decision. I cannot provide any comment. I know 19lbs works, I have no idea about anything less.
Ciao,
Adrian.

Steven C.

OK, so I am thinking of going for an RS clutch and a 89 C4 flywheel(19 lbs.) to solve all of this so I can enjoy driving my car with two feet instead of the currently required three? What is the list of all the parts I should require?

Who has the best prices for this stuff? I do not see in some of my catalogs an RS clutch. Is this a ROW part I need to source outside the U.S.?

Thanks for the help all,

Steve

Adrian

Dear Steve,
I would send a PM to Jason Andreas. He struck some problems using a 89C4 flywheel. I know this requires mixing up a number of different parts if you are going to mix and match the components of multiple models. The basic problem is the throw distance. Jason also mentioned some starting ring location issues which I have never heard of before but he struck them so ask him to spell out exactly what happened before you spend your own money.
My direct advice is to contact Andial and get their 19lb kit.
The Carrera RS is a ROW model only and I am not sure if ALL parts are available in the USA or if you have to order them through Rennlist sponsor Gert in Belgium.
Ciao,
Adrian.

C4Russ

For the rest of us, what is the objective advantage of the lightweight flywheel? What type of accleration bump should one expect? I ask this as I suspect the clutch assembly in my car to be stock as the PO's have left this car unmolested.

I've got a 91 C4 w/ 99K and can still rip off 5.35 0-60 runs consistently, according to the Escort timer. The car got a new clutch assembly from the PO at 86K. New plate, disc, flywheel and related bolts & bearings. The clutch pedal is firm but not difficult to use though I race bicycles and admittedly have fair leg strength.

So what does one gain? My car runs fine and doesn't stall at stoplights with the air on but I do see the idle drop very low as I depress the clutch. I've got to think if I had the lightweight assembly, I'd see the car stall.

Indycam

Hiya C4Russ
I think the downside of a lightweight flywheel outweight any benefit you might hope to gain .
Your 0-60 times might be longer than what you are getting now .