dholling13

Colin,

What pads did you prefer on the 38D? Manny advised me on the GTS rotors...

38D

I ran Pagid yellow or blacks. I liked the blacks a bit better overall.

pantswagen

are they both 322mm with a 32mm disc girth
-and with an overall height of 80mm


ie the offset = 80mm back of disc to wheel face

oh ps, has anyone in london got an odd one laying about, so i can use it to make a radial adaptor

cobalt

Yes the GTS and 94 turbo rotors are identical other than the cross drilled or cast holes. I have switched them between my cars and they work fine for either application. I am currently running 94 turbo rotors on my GTS just because they look better.

cobalt

Maybe a picture will help

Here is my GTS with solid and cross drilled 94 rotor as you acn see they both are the same minus the holes.

pantswagen

ahh thanks

-so they are both 322mm by 32mm think

-their offset, -total hat heighyt is 77mm

-the 993 twin turbo is 72
-what the bugger is , the cayenne -60 buck discs are 330 by 32, but 68mm high

-damn shame!!!

spjuvern

are there no one that have mount alcon rotors for exampel with special fabrecated alu hub?
i never heard or seen any one done this way is that, after all craked oem rotors

cobalt

The only 964T I have seen with aluminum hubs is a 1992 US model S2. The car was upgraded to big reds but I believe they used an adapter and fitted 993TT fronts instead of just bolting on 94 big reds.

I have been looking for a set of these myself. You might try to contact these people and see if they can do anything for you although I am quite sure the price would be prohibitive.

http://www.zeckhausen.com/StopTech/consumables.htm#Hats

spjuvern

i could do the hubs in my workshop thats is not the problem,
but i wonder why no one else have done that on the 964 turbo that have this big problem with cracks.

cobalt

I seem to be lucky so far. I have Big reds on my C2 and even after 3 30 min run sessions back to back with me driving twice and my wife in the middle. I have yet to see any cracks in my rotors. I push the car very hard to the point were you can smell the brakes and they glow after the run yet no cracking. This is even with the equivalent of 14 track days still no cracking. Go figure.

Staffan

Had huge problems with cracks on my discs.
Had long discussions with a brake specialist ("Stacke", "spjuvern" knows who he is).
His suggestion was to get bigger calipers and/or floating discs.

My problems got worse with some break pad brands.
This fall the situation got so bad I couldn't run the car on the track with a passenger, warped two sets of discs and had severe cracks.

Installed big reds and changed back to yellow pagids, have no problems with warping discs and much less of a problem with cracks than before.

Geoffrey

Several thoughts here. The OEM rotors seem to have more machining for balancing and slightly different holes than the Porsche Dealer rotor. The 91/92 rotors are the same size (322x32) as the 94 and GTS rotors, but the latter have more surface area near the hubs to accomodate the larger calipers. I've not had good luck with Coleman rotors, they seem to be on the cheap side to me. There is a kit available that uses an aluminum hat and an AP Racing slotted Rotor and is 332x22 which only requires spacers under the brake caliper. I'm running these rotors on my car with good success.

hanfrac

i'm replacing my front rotors and pads for the 3rd time in 14,000 of street driving. each time, the rotors go out of round and I get progressively worse pulsation thru the steering wheel - car is not enjoyable to drive this way.

found a local german brake specialist who is insisting that we put on "genuine porsche" pads and rotors. looking at pelican parts, they have "OEM rotors" and "OEM pads" from Textar, Pagid and Mintex as well as "Genuine Porsche" pads at more than double the cost. The brake shop wants to do the job right (meaning the way it left the factory).

note - they believe the rotors went out of round this time because the lug nuts were significantly overtorqued.

any advice would be appreciated. Thanks.

Frank
1991 965

cobalt

Sorry but what would overtorquing the lug nuts do to warp the rotors? How does one overtorque stock Aluminum lug nuts without stripping them. Does sound right to me.

I have big red/blacks on 3 of my cars and have never had any issues. i have used mintex, textar and pagid yellows and i have not had any issues. In fact my track car has had some serious use this year without a sign of fade or warpage or cracking.

hanfrac

the claim is that when the rotors were put on, the bolts were overtorqued (something like 125 ft pounds vs. a recommended 90-something) and this caused the rotors to go out of round.

the shop (www.schulba.com) is a german brake specialist. two reputable porsche wrenches (German Tech in Largo, FL and Heyer Performance in Mountain View, CA) could not identify the root cause of the warping.

on the one hand, I'm glad that there's a shop with brake experience who is insisting on tackling the problem and doing it right. on the other hand, it feels like a money black hole if they're wrong and that the first response on Rennlist is that they're probably wrong.