[MKS427]

Tire pressures are huge as these cars are light. My buddy has BFGs on his Cobra and he had traction issues. Somehow his pressures dropped to 14 psi front and 11 psi rear and he couldn't believe how much "better" his tires had been lately. Obviously, it is not recommended to run that low and when we upped the pressure the tires were slick again.
That said, these cars are light and the tires do not work well with 30-35 psi. I run Nitto NT01s on 17" wheels @ 22 psi per Factory Five's recommendation and they work considerably better at 22 vs 30. I do not know the recommend pressures for 15" wheels/26.5" tires, but I'm guessing somewhere below 30 psi.
I have been told, with the Nitto's, you want to be scuffing to the top of the triangles on the sidewall.
All that said, the best traction additive, I've found so far, is 200 lb plus passenger. ��