Hey Tony try setting it to 17 degrees BTDC and you will even notice more power slightly. It is only until you get into the high PSI levels that you might experience detonation. If you do then you will have to set it back to 15. But for now if you are only running 10psi tops then set it to 17 and watch your car come alive even more than it is not. But if you hear pinging like in a can then set it back, because you will detonate.