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Need some help: I've been running a 305/30/19 square setup on my '11 GT on track for a while now and it's been great except that I keep getting excessive tire wear on the outside shoulder. I'm trying to figure out if this is a setup issue, a driving issue, or just normal on an S197 with such wide tires.
Basic setup is Cortex coilovers, 400/200 spring rates, Eibach 35 mm front bar on middle position, 18 mm Ford rear sway (or no rear sway), Vorshlag front cc plates with 3 degrees neg camber. I've been running tires 35 psi hot all around, careful to check right away coming off track. Unsure of the exact ride height but car is sitting pretty high, not slammed at all. Using spacers and extended studs up front and rotating tires corner to corner/front to back between events.
Car feels good and balanced and overall easy to drive quickly but by now I have now gone through multiple sets of 305/30/19 tires and keep getting significantly more wear on the outside shoulders as compared to the rest of the tire. I've been mostly using RE71, GY SC3, and SC 3R. Tires keep turning blue on the outside shoulder, and some of the Goodyears have blistered. None of the tires have seemed to be rolling over excessively, based on indicators on the tire sidewall. It appears most of the excessive shoulder wear is coming from when tires are mounted on the front. Car does not seem to have excessive roll.
I am torn between maybe stiffening the front roll rate, on the theory that the front might be rolling over too much and losing suspension geometry, versus softening the front roll rate on the theory that the fronts are carrying too much of the cornering loads? Any other thoughts or ideas on things to try? Any experience, advice, or tips on this would be much appreciated, thanks all.
Basic setup is Cortex coilovers, 400/200 spring rates, Eibach 35 mm front bar on middle position, 18 mm Ford rear sway (or no rear sway), Vorshlag front cc plates with 3 degrees neg camber. I've been running tires 35 psi hot all around, careful to check right away coming off track. Unsure of the exact ride height but car is sitting pretty high, not slammed at all. Using spacers and extended studs up front and rotating tires corner to corner/front to back between events.
Car feels good and balanced and overall easy to drive quickly but by now I have now gone through multiple sets of 305/30/19 tires and keep getting significantly more wear on the outside shoulders as compared to the rest of the tire. I've been mostly using RE71, GY SC3, and SC 3R. Tires keep turning blue on the outside shoulder, and some of the Goodyears have blistered. None of the tires have seemed to be rolling over excessively, based on indicators on the tire sidewall. It appears most of the excessive shoulder wear is coming from when tires are mounted on the front. Car does not seem to have excessive roll.
I am torn between maybe stiffening the front roll rate, on the theory that the front might be rolling over too much and losing suspension geometry, versus softening the front roll rate on the theory that the fronts are carrying too much of the cornering loads? Any other thoughts or ideas on things to try? Any experience, advice, or tips on this would be much appreciated, thanks all.
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