I might be wrong but after changing down tyre sizes, which equates to changing final drive ratios, so that i am using all the rev range in every gear i have just got my quickest time round mp even after hitting rev limit in top twice per lap. Maybe i need to go to a 4.4 just to see the affect on my times?? I believe that if i only have basic engine, okay but nothing special in the power department compared to some cars out there, i need all the acceleration i can find. Keep the ideas coming, i'm always open to interesting discussion that might lead to quicker times.....By the way does anyone have a 4.6 diff??? And apart from nismo, 4.4 only comes in r200. I run r180 cos its lighter. cheers