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I hate to be the guy that can’t search forums and threads but it looks like I’m that guy. I have a RS America that’s been my race car and I’m on a slow project to convert it to a street car. I recently solved the acceleration hesitation (as in it wouldn’t accept any throttle and then would quit..) issue which was attributed to the airflow meter. Just prior to this I had replaced a custom chip with a 911 Chips/Wong(?) chip because the of an issue with the light weight flywheel. It appears to have worked but i haven’t driven it much since the new chip. It does idle without me on the gas which is a first..
Here is my issue. It has a clutch from a 996 Cup Car. Triple disc SACHS? Not sure. It’s brilliant on the track and the shifts are super quick and precise. For street duty it’s next to impossible as the initial engagement to get moving sounds like I’m doing a standing start race. Lots of noise and shuddering as I can’t release clutch like I do when I’m on the track. That and I can’t have any car in front of me because chances are good I’ll rear end them.
I’m going to replace it but it looks like there are a lot of options besides a stock unit. I’m hoping somebody can chime in on their recommendations of clutches that they’ve installed that are not stock and are happy with them. It’ll be a street car so looking for drivability but certainly can handle something that will be driven hard, I just want it to be drivable on the street and not dread driving in traffic. The engine had a rebuild that was beyond stock and is up on horsepower. I keep seeing “sport” clutch packages with different levels.
The single mass 993/964 RS clutch is probably the way to go, a very common upgrade for these cars. No noise, easy to drive and quick revs (probably not in comparison to your 996 Cup, though). Let me know if you are selling any of your used race parts, I'm the only idiot out there turning his RSA into a race car....
I hate to be the guy that can’t search forums and threads but it looks like I’m that guy. I have a RS America that’s been my race car and I’m on a slow project to convert it to a street car. I recently solved the acceleration hesitation (as in it wouldn’t accept any throttle and then would quit..) issue which was attributed to the airflow meter. Just prior to this I had replaced a custom chip with a 911 Chips/Wong(?) chip because the of an issue with the light weight flywheel. It appears to have worked but i haven’t driven it much since the new chip. It does idle without me on the gas which is a first..
Here is my issue. It has a clutch from a 996 Cup Car. Triple disc SACHS? Not sure. It’s brilliant on the track and the shifts are super quick and precise. For street duty it’s next to impossible as the initial engagement to get moving sounds like I’m doing a standing start race. Lots of noise and shuddering as I can’t release clutch like I do when I’m on the track. That and I can’t have any car in front of me because chances are good I’ll rear end them.
I’m going to replace it but it looks like there are a lot of options besides a stock unit. I’m hoping somebody can chime in on their recommendations of clutches that they’ve installed that are not stock and are happy with them. It’ll be a street car so looking for drivability but certainly can handle something that will be driven hard, I just want it to be drivable on the street and not dread driving in traffic. The engine had a rebuild that was beyond stock and is up on horsepower. I keep seeing “sport” clutch packages with different levels.
Any advice would be appreciated. Thanks.
Rob
Rob,
I don't believe Sachs offers a triple disc clutch AFAIK the smaller dia triple disc setup on the 996 Cup car was made by Tilton. Essentially the same setup as used one the Carrera GT. Although that would be the later 996 Cups AFAIK the earlier ones used essentially a similar setup to the RS which is a LWF heavier spring plate and spring clutch disc. . These triple disc racing clutches are not meant to be slipped which will quickly burn out the plates. It is essentially an on/off switch. I would consider the RS package it is a nice compromise and would not be as much of an issue. You can go with heavier spring plate but IMO for the stock power or even a bit more unnecessary.
I have a Tilton 3 disc setup around someplace. Very nice stuff but I won't even bother using it on my track car the AP spring plate I have works almost as well at a fraction of the cost.
Guys- I appreciate the responses. I looked up the notes from back in the day when I was going from stock to race car. It was a 4 puck disc and pressure plate and bearing off of a 996 Cup. Other notes reference a triple disc race clutch and steel synchros for 2-4th which are Cup parts. I’m sure from those notes somebody has a better idea of what the exact set up is. For me it’s an on/off switch on take off but once I’m at speed on a track it’s awesome.
I’m interested in looking at the RS package but don’t know if that’s hobbled together with Porsche stock parts or available as a kit via Porsche or another outfit. I did some googling and there seems like a lot of options that I’m not sure what is what. Any advice on exactly what I need (heavy spring plate vs ?) and where I can get it would be great. I just need to get it drivable as the clutch is crazy heavy now and the transition is an on off switch which for street duty is impossible.
Slow RSA... We could just trade cars! FYI... I had to go to the hidden receipt file to look this up and the file was huge. I’m trying to keep some of the race items intact but other things will definitely have to go. Would love to hear about what your doing.
I can get some photos of the Tilton clutch package. It is from of one of the 996 cup cars. I have a 00 cup car in pieces. The engine was factory sealed from new but I don't know if the clutch was changed in its 400 hours of life. It used a similar setup to what I have but this is for a 993 engine which will put out close to 500 WHP.
I have some pics but will try to get you more info. Also Patrick Motorsports has some options. AFAIK the mezger engines all accept the same clutch packages.
The 964 RS part numbers are
96410223931 Flywheel
96411414331 Ring gear
96411601110 Clutch disc with springs need to absorb the pulsations normally absorbed by the dual mass
96410215101 pan head screws needed for LWF
96411602890 C2/RS pressure plate or 96411602853 heavier duty used on turbo 3.6
Great info. Thanks. Once I pull it out I guess I’ll know what I have. If the 964 RS is over kill or stupid expensive... are there other options? I think in my search there seemed to be stock, sport 1, sport 2, etc. They all were for 964s. I think it was Pelican Parts that had the options and kits. Thanks.
If you have access to Worldpac or some wholesaler they do offer kits. Full factory Clutch flywheel packages are not cheap. Pelican has SPEC I am have never used them although it was recommended to me by some not to bother.
Cobalt- Thanks. I’m assuming the part numbers you listed earlier in the thread are the parts I would need to make the switch to a RS set up. I did a quick search online and it looks like I can get them from various vendors. Whether they had them in stock may be a different story. Quick math it looked like around 2K give or take on the parts alone. Any recommendations on places to get this stuff would be appreciated. Thanks
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Clutch replacement options., RS America
