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C4S transmission options???

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Old 10-23-2009 | 02:48 PM
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Default C4S transmission options???

Are us C4S guys limited to re-gearing the transmission because most of the good 3x boxes are 2wd?
Old 10-23-2009 | 03:02 PM
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Yes, but you could always go 2wd and end up with what amounts to a C2S with big brakes. My car started out as a 98 C4S Tip and now is a 2wd with a manual trans.
Old 10-23-2009 | 03:10 PM
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Originally Posted by Evan Fullerton
My car started out as a 98 C4S Tip and now is a 2wd with a manual trans.
Wow, really? Why didn't you just buy a manual C2S instead? Must've cost a fair amount of money to change the transmission and also go from AWD to RWD. I wonder if, with that extra money you spent on the tranny and AWD conversion, you couldn't have sold your C4S and bought a C2S manual instead.

I wonder if you'll take a hit from these conversions should you ever decide to sell...
Old 10-23-2009 | 03:12 PM
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Originally Posted by Evan Fullerton
Yes, but you could always go 2wd and end up with what amounts to a C2S with big brakes. My car started out as a 98 C4S Tip and now is a 2wd with a manual trans.
I like the AWD traction on the street. Headed to 600HP+ so I need all I can get.
Old 10-23-2009 | 03:21 PM
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Originally Posted by goofballdeluxe
Wow, really? Why didn't you just buy a manual C2S instead? Must've cost a fair amount of money to change the transmission and also go from AWD to RWD. I wonder if, with that extra money you spent on the tranny and AWD conversion, you couldn't have sold your C4S and bought a C2S manual instead.

I wonder if you'll take a hit from these conversions should you ever decide to sell...
I bought the car this way. It is a full blown RSR replica, factory motorsports everything in the suspension, centerlock wheels, StopTech brakes, Moton SC shocks, the works. It is currently not street legal so resale is not really big on the list but I think it will be ok as I paid $.10 on the dollar of what it cost to build with 18 hours on everything. Nothing on the car is original streetcar really besides the tub and even that has been modified for the cage, sunroof delete, wing etc.

Last edited by Evan Fullerton; 10-23-2009 at 07:04 PM.
Old 10-23-2009 | 03:43 PM
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I'm curious what does a RWD conversion entail for the 993 series? Anybody have an idea? Thanks!
Old 10-23-2009 | 04:11 PM
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Originally Posted by ilko
I'm curious what does a RWD conversion entail for the 993 series? Anybody have an idea? Thanks!
Do a search on the 993TT board. There are lots of 2WD conversions over there.
Old 10-23-2009 | 04:13 PM
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Originally Posted by ilko
I'm curious what does a RWD conversion entail for the 993 series? Anybody have an idea? Thanks!
Removing torque tube, front diff, front axles
Add 2WD shift box and a front trans mount to augment the AWD trans mount

Takes about $700 in parts from Porsche with a couple of different ways to handle the shift parts.

Not really hard to do and can be reversed in same amount of time it takes to convert. About a day's work.

If you want more info feel free to contact me... I have a parts list and plenty of info.

EDIT: or do what Patrick said above. Took me longer to type
Old 10-23-2009 | 04:24 PM
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Thank you guys! I haven't even taken delivery of the C4S, but I'm already looking into a list of things to do to it over the winter
Old 10-23-2009 | 06:06 PM
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Originally Posted by MarinS4
Are us C4S guys limited to re-gearing the transmission because most of the good 3x boxes are 2wd?
Internally the g64/51 & 52 have the architecture as the g50/20 & 21. The limiting factor for regears besides your wallet are the fixed 1 & 2 which requires a new main shaft to change 1 & 2, other than that, all the 3 =>6 changes that /2x guys can do do you can do too.
Old 10-23-2009 | 06:35 PM
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Originally Posted by Bill Verburg
Internally the g64/51 & 52 have the architecture as the g50/20 & 21. The limiting factor for regears besides your wallet are the fixed 1 & 2 which requires a new main shaft to change 1 & 2, other than that, all the 3 =>6 changes that /2x guys can do do you can do too.

I quess my real beef is the 1st and 2nd which I can't really change because the long AWD main shaft does not have the taller 1st gear option
Old 10-23-2009 | 07:04 PM
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I would look into a 996TT box. I do not know about the conversion for 4WD but with my 993 since I need a trans I have been looking at GT3 and GT2 boxes. With the 2WD it is a fairly straight forward conversion with the shift linkage being the only hangup from it being a direct bolt in (996/7 are cable shift, 993 is not). I have a 997RSR clutch setup in my car so maybe with the stock clutch parts it is more work but I would look into it.

Last edited by Evan Fullerton; 10-23-2009 at 08:07 PM.
Old 10-23-2009 | 07:10 PM
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Originally Posted by Evan Fullerton
I bought the car this way. It is a full blown RSR replica, factory motorsports everything in the suspension, centerlock wheels, StopTech brakes, Moton SC shocks, the works. It is currently not street legal so resale is not really big on the list but I think it will be ok as I paid $.10 on the dollar of what it cost to build with 18 hours on everything. Nothing on the car is original streetcar really besides the tub and even that has been modified for the cage, sunroof delete, wing etc.
Was this car Arena Red when you bought it by any chance?
Old 10-23-2009 | 07:30 PM
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Originally Posted by Evan Fullerton
I would look into a 996TT box. I do not know about the conversion for 4WD but with my 993 since I need a trans I have been looking at GT3 and GT2 boxes. With the 2WD it is a fairly straight forward conversion with the shift linkage being the only hangup form it being a direct bolt in (996/7 are cable shift, 993 is not). I have a 997RSR clutch setup in my car so maybe with the stock clutch parts it is more work but I would look into it.
early 996 up through maybe '01 or '02(but I need to check the exact years) were rod shifted as are the 993s. There was a post that outlined the differences I haven't been able to find it again but as I recall there are a few other differences in the way besides the shifting
Old 10-23-2009 | 07:32 PM
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Originally Posted by MarinS4
I quess my real beef is the 1st and 2nd which I can't really change because the long AWD main shaft does not have the taller 1st gear option
a g50 and g64 mainshaft ar the same except for the actual gearing


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