Main Menu

C4 conversion to C2

Transmission and Clutch

Vehicle Information: Model: 964 C4; Year: 1990; Body Type: Coupe; Engine (type, size, modifications): 3.8; Total Mileage: 108,000;

I recently purchased a '90 C4 that has had some engine work done back at the 75,000 mile mark(3.8 liter conversion, Mahle racing pistons, etc.) as well as some minor suspension upgrades. I'm interested in continuing the conversion of this car to a weekend track racer. I've spoken with a gentleman who has a local performance/racing shop that deals strictly with Porsches, and as part of my plan to continue the conversion, he recommends converting the C4 drivetrain to a C2. He has led me to believe that the C4 is a superior platform than the C2 for track applications due to the different geometry of the rear suspension (he didn't go into detail); and also that the only thing we'll need to do is remove the front drivetrain components. I've read in a previous 2005 post that you recommend a full C2 transmission replacement rather than merely ripping out the C4 components. Is this still the advice you would offer, or has the conversion been so popular over the years that there's something new that would allow me to keep the C4 tranny? Also, any idea what the differences are in the rear suspension of the C4 vs the C2 that would make it more desirable as a track car? Thanks for the help, -Ryan

You must log in to view answers associated with technical questions. Join PCA to participate in our community.
No votes yet