Problem with the traction control was only designed to stop wheelspin from a 240kw motor.. Your producing over 340kw at the engine now.. With nankangs, face it, they have no traction what so ever, so the car wheelspins easy.. Part of the traction control system is to only attempt to control wheelspin by heavilty retarding spark and pulsing the back breaks for X seconds.. If it finds its not doing that, and or the acceleration of the wheels is increasing not decresing, It gives up and logs a failure code.. Hense the requirement to turn car off and back on again to unfreeze the light. The main reason for this is excessive spark retard, especially in a turbo vehicle causes the EGT to go through the roof, and that aint exactly a good thing for prolonged periods of time. Now that you have better grippy tyres, your finding the degree of wheelspin you have now is less due to the increased grip, and Traction control is able to control it (everytime it flickers its pulling spark timing out, and clamping the rear brakes depending on how excessive th wheelspin is) Ahh, the pleasures of Open Duty cycle controlled boost........ Get your car retuned by a tuner who knows how to tune with closed boost control.. Your boost "Should" remind the same regardless of the time of day, or more importantly the air density/tempreture. danny.