SPR

Hey guys not to hijack the thread but I am running -2 in the rear. Upon a break in a canyon run drive this last friday, I noticed CORD showing!! The innner most part of the tire was burned through and I mean inner most. Might this be due to a greater than normal toe in with -2??? I thought it was perfectly fine to run that much camber and get quasi decent wear? I need to get two new rears now . BTW I am running -1f and-2r, offhand I don't know what we set the toe at but I usually set it almost at 0 front and don't know what it was rear. Thanks for any suggestions.

mds

The 1999 GT3 settings are identical to the regular 2004 GT3 settings (not the GT3 RS settings) except for the following:

Front axle height: 112 - 10mm (112 to 102mm)
Rear axle height: 125 + 10mm (125 to 135mm)

Front sway bar: position 3 (center position)
Rear sway bar: position 2 (second softest position)

The GT3 RS uses these sway bar settings also, they are 1 hole softer than the regular 2004 GT3.

SPR

Interested I actually run my front bar at full soft and rear at that setting.

mds

Sean, -2 camber is fine, check for too much toe in.

SPR

Cool will do thanks!

gtdrei

Z06,

The PS Cup is a poor autoX tire. It's an excellent DE/Lapping day tire, but it does not heat up fast enough for Solo competition. If your primary motorsport activity is Solo, consider Kumhos, Dunlops, or even the stock street tire, if you have to drive to the events. If you can change wheels at the event then, Hoosiers will make a serious dent in your times.
Robin

Racerron

SPR and MDS .....too much toe-in will cause premature OUTSIDE tire wear and inside tire wear is caused by either too much negative camber for the type of driving and/or too much toe out.

mds

I agree Ron, my bad.

Larry Herman

Brian, all you need to do is to remove the upper strut mounts, press out the 3 pins and place them in the other set of holes, and then re-install the mount, rotating it 60 degrees from it's original installed position (I don't remember which way to rotate it, but it's obvious). There are no "pre-punched" holes in the sheetmetal.

Question for Viken...What is TOE UNPRESSED?

Z06

gtdrei,

I have used the MPSC in mid July with great success on a very technical track, lots of turns......in the past i have found the Kuhmo to be an excellent Solo 1 tire, may try it again this summer.

Viken

I think it means no load on the suspension. IOW, the car at its static ride height.

Carrera GT

Viken, thanks for posting the factory specs (I always know where to come to get a print-out!) ...
And "un-pressed comes from the days when Porsche published "pressed" numbers -- this means (front axle only) taking readings with a press-rod (a spring-loaded stick) pushing out the front tires to simulate the effective position of the front wheels under acceleration (yes, the suspension would also be more extended, but these are specs compensated to DIN weight and balance on the alignment rack) or heavy deceleration. For whatever reason (mainly by influence from the alignment equipment companies and the slow processes and potentially variable operator behaviour using a press rod) Porsche went to the conventional un-pressed number. In older 911's, the difference can be significant -- getting it wrong will obviously destroy a tire in very few miles and potentially create wild handling ... hence the ongoing liability-averse behaviour of publishing a redundant word like "unpressed."

And inside shoulder wear on the rear of a 996, especially the GT3 is very likely insufficient toe -- or at least zero toe. When you put on new tires, use correct specs and monitor pressure and temperature across three points to avoid wasting tires.

Cheers,

gtdrei

I've run 3 Autocrosses with the Dunlop SSR's, and they're so-so, better than MPS2's, but don't heat up on a 45 degree morning. Hoosier and Kumho each have their fanatic followings, the Corvette people seem to love Kumho's. I'll start with Hoosiers, and go from there.

RevUrGT3

Hey Viken,

The 05 settings are the same for the 04, correct? I am taking my car tomorrow for a pre-track day aligment.

Thanks!

cosmos

I am not the Viken, but, Yes, the same.