>We all know that the knock detection of the B13 style OBD-I ECU is pretty >crappy. Off at WOT and above 4500 RPM is pretty useless. Octane requirement goes down as rpm goes up, so an N/A motor would probably never experience detonation above 4500 rpm. Joe, are you sure the knock sensor is ignored WOT? At low rpm, that's when it's needed most. All bets are off for DETs. BiH