Ok so I got a Brenspeed custom tune with a 87, 91, 93 octane tune options. I filled the tank with BP 93 octane fuel. I downloaded the 93 tune and the motor detonates pretty hard. I can hear it each time I catch a gear. I then downloaded the 91 tune and it still detonates but not as bad as the 93 setting. Finally I downloaded the 87 tune and it doesn't detonate at all. I love the off idle torque the 87 tune has. I really love the mid to upper pull the 91 tune has. The 93 seems like an all out tune when you really want to beat it hard on a back road or on the track. My question is, shouldn't I be able to run the 93 tune all the time without any detonation? I would be happy with the 91 tune as my everyday setting but that little bit of detonation bothers me. I accurately described all my mods to Brenspeed, so my tune should be spot on. Has anybody out there had the same detonation issues with a tune?