Andy Off the line you will gain time as an open diff will spin up one wheel and you will also benefit when exiting a corner. For example you will have better traction when exiting Fradley which will increase the exit speed that you will carry down the straight. However, you better check the regs if you intend to go racing as an LSD might not be permitted. Hopefully Mark Gibson will be along soon as he has competed at Curbs in a similar spec car.