wogamax

In a 997.1 GT3, I took camber in front as negative as possible (~-2.5 deg) and kept the common .5 degree differential, with the rear (-2.0). You'll still wear street tires on the inside, but if you are lapping quickly, you will also wear the outsides of your track tires. It's a compromise, for a car that, IMO, really needs its front towers spun 180 degrees to get what is probably a better -3.0. I don't know if spring rate/ride height was raised for 997.2's. I don't really street anymore, and that's what I'd do next.

I agree on the larger front spoiler, and got sage advice to set the rear wing to its highest slope. I think there's a reason GT3 wings got bigger over time, and cringe to think what could happen with a selectively lowered 997.1 rear, and not making these other changes. I'm thinking of air getting under the car, as you go over a hill (like WGI's S's), or around a long sweeper with a crest. Porsche has been making a big deal about correct mating of front / rear spoilers, at least since at least the 80's. It can really matter at the speeds (and throttle) of a GT3.

ShakeNBake

Rake is super important as well. Make sure it's at least stock, or lower in rear by a few mm. It will move static weight to rear and make the car more stable before you start moving weight to the rear (i.e. 1/3 of the way to the apex) as you start accelerating out of the corner. That loose feeling is the major way the car undermines my confidence.

drl

hmmm my ride height is stock...maybe i should consider adjusting

deputydog95

That isn't enough camber for hoosiers. You might want to consider running nitto instead if you want to run a less aggressive alignment. Not that you can't run hoosiers like that, but you're not getting the performance out of them you're paying for...

However, you can run a less agressive alignment... and still have great track performance on a very fast r comp tire. That same alignment will go easy on your street tires too.

It's hard to have a dual purpose car. Something has to be compromised.

johnwb

Well, I had my first DE experience in my new to me (2007) GT3.
Wow! What a car. It does everything better than my 997.1 C2S.

The car is crazy fast and the higher redline is intoxicating.

Following our discussion on this thread I had the car aligned, corner balanced and had the OEM sways adjusted.

Alignment (camber/toe)
-2.3/.01
-2.0/.14

Front anti-sway = one from full soft
Rear anti-sway = full firm

I didn't push things too hard as my goal was not to be the guy that crashes his new GT3 on its first trip to the track. Mission accomplished.

I easily matched my best lap time in my C2S but didn't even try to push it beyond that. The braking points are all so different with the PCCBs and I didn't begin to explore them.

The alignment/sway settings felt very good. Neutral handling and it felt pretty predictable. Tire wear on Hoosier R6 was good. All in all I'd say it's set up well and I can't wait to be back on the track in late September to begin to explore this new car.

One bad thing happened. One coolant fitting failed and I dumped my coolant. Fortunately I didn't spin and neither did my friends behind me. I have filed a complaint with the NHTSA and my shop has pulled the engine and is welding all of the fittings.

Spyerx

Glad nothing bad happened.

Curious:
Miles on your car? How much track time prior to your ownership?

johnwb

23,000 miles. To my understanding I'm the first to put track miles on it. About 1.5 hours.