campoj2

Excellent summation Lil Bastard!

Laker

The Gearbox took just under a gallon of Delvac, and two beers for me.
The Front Diff. (C4 only) takes an extra 30 minutes to drain and fill with a quart of Delvac, + another beer for me.

boxsey911

That's a nice comparison (same driver/different 964). In track driving terms I would say those differences are quite significant. More so in racing terms. After 10 laps the RSA would be 20 to 30 seconds ahead of the C4 depending on the track.

campoj2

Not everyone builds a track car out of their 964.

I think the only numbers missing is the 0 to 60 and the 1/4 mile times.

It's nice to have accurate data to compare the 2 versions.

Laker

Isn't a RSA a lot lighter than a C2? So these laps times although very interesting, are not truly C2 vs C4 times.

Unkle

I would love to see damp and wet times for a comparison as well

Bearclaw

Seriously - this system was developed on the 959. They spared no expense figuring out how to make it right.

All I've had on it in 5 years have been routine fluid changes. I have all the service records for my car almost back to the beginning, and no evidence that it ever gave the PO's a lick of trouble.

Buy the best car you find, irrespective of C2 vs. C4.

Dwane

I have a C4.
My buddy an RSA.
We run the blue run group. I am by no means a race car driver!
At Tremblant I am 1 second quicker when it's dry...We have no idea in the wet because he doesn't get on track.
I'd say

campoj2

Laker, Where are you in Philly? I'm over in Delco....

Laker

Hey Campoj2, I saw that.... "Media, everybody's hometown"
I'm in Bryn Mawr

frankvan

of course testing fate, as soon as i post in this thread i find a problem.
the transmission seals for both differential locks are leaking. transverse not so bad but the longitudinal is about a drip every 3 seconds. 2 foot wide puddle in middle of garage
Now to start a new thread and find out the correct part numbers for those seals (search revealed nothing about tranny seals, just the lock cylinders which ARE expensive).

frankvan

I should have added - this is after driving in -25 for three days.

supark

I was chatting with the porsche shop in my neighborhood about my C4 and he had nothing bad to say about the awd systems - he says he doesn't see the 964 C4s being any more troublesome/maintenance heavy than the C2s he sees in the shop, which was definitely good to hear. The awd is great in the wet - which is often in seattle and I've yet to have a problem with it in a bit under a year of ownership.

I guess the only thing that be a ding against the C4 (aside from any subjective thoughts on which one drives "better") is that a clutch replacement in the C4 is ideally an engine out procedure, whereas the C2 can be done with the engine in. I have read a few threads though of people doing their clutch with the engine in by just loosening the engine from the mounts and lowering it a bit for clearance. Would be a silly reason not to get a C4 though, being that by the time you need to replace the clutch, there are plenty of things that would be easier serviced with the engine out anyways.