I just rented my car out to a student over this past weekend to get his SCCA license. He ran with the Traction Control on the whole time and had no issues. I run Kodiak 17" all around with the 315s on back.
When I run with 285/30/18s...24.6 inch diameter in the rear, I have to turn the computer off because it thinks the rear tires are spinning! But the car thinks it has a 3.70 rear and boy can it accellerate! FWIW