I'll have to try adjusting the gearing. Do you have any suggestions on the gearing? I don't have much experience on adjusting the gearing settings. Thanks for the advice.I think you've got a little room to add some power to the Nissan GTR R35 TC too. If I remember right, it starts at around 615pp. IF you gear it to around 205mph top end that should give you enough speed and power.
My wife won the 15 minute at the Nurburgring by down tuning a Toyota 7 to 650pp. I think she was getting lap times of around 6:54. I like to build up street cars for races like this, but she prefers to down tune race cars for it. It's all a matter of preference.