Nah, didn't think you were having a go at all.. Anyway, tyres are 245/45 18"... No flat changing, but change at 4000rpm into 2nd and 4300 rpm into the 3rd. Quick question, do you hold 2nd gear to 100kph?. That's bad if you do. Too high in the revs.. People think one less gearchange is quicker, and when you read all the Motor/Wheels tests, they say how 2nd gear is tall enough to get to 100kph. Completely wrong from a fast time point of view. Change into 3rd at around 80kph and tell me how you do. Power, 300rwkw. With the old tyres, I could only manage 4.5 seconds because of wheelspin. Now, 4.5 is a slow time. ← F6 UTE I understand what your saying change 1st @ 4000 rpm & then 2nd @ 4300rpm if this is true its should give you better 1/4 mile times as well,,, ill try it tonight when its cooler & post back & take my hat off to ya,,or call you a pioneer in this subject at least on this forum. BB