My car oversteers like crazy with the F&R factory recommended pressures. Even reducing the pressures to 37F & 40R still doesn't resolve the issue.

 

I don't have that problem and put enough air to stop the TPMS from lighting up.

 

If you are over steering, assuming your suspension is good, I think you are over inflating your tires. Try 35 in the front and 37 rear

 

Are you sure that it oversteers? Other than the snap oversteer characteristic of these cars when cornering aggressively with stability control disabled, it is designed to significantly understeer from the factory....which is a good idea given that it's a 500+ HP car that is typically bought by people who don't know anything about driving. So the understeer characteristic probably saves an untold number of lives.

But lets assume that you drive the car hard with PSM disabled and you want to dampen the snap oversteer associated with a very powerful rear-engine car. You need to rear end to be "planted" as firmly as possible. And frankly you aren't going to accomplish that with tire pressure alone. A good start is rear end dog bone/end links, good tires and an alignment to match your driving style. Also, this work should be done by someone that actually races 911's.

Of course this is just a start. If you want to tighten up the rear end more and hit the track, then you need to get a good set of coils, dial in a lot of neg front camber, and you can have a car that handles like a GT2. Unfortunately it will take around $10K.

 

34f and 40r is what I find comfortable with a good feel.

 

Those aren't the factory pressures.

Those are the factory numbers. I had the dealer set to the door settings as well. If you check the manual, the factory pressure settings are 34/40. Comfortable ride and seems like perfect traction and balance. I'm a bit curious why they changed from the .1, which had recommended 33/39. Don't set the your tires according to the max settings on the door jamb.

 

I running 38 front and 43 rear

 

33 / 36 for me in general, but I have a highly modified suspension. On the track I start with 28 all around cold and keep it to more than 37 hot. I run Michelin PSS all around.

 

I would say because at those lower pressures, the insides of the rear tires will wear faster than if the pressures were set higher.

 

Curious why you track with PSS. I tried once and it was downright dangerous. They melted and turned to grease. They are a 300 treadwear street tire so they aren't designed for heavy track use.

 

33 front 37 rear here

 

34 f and 40 r for me.