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Re: Dilemna: seriously increased power, but not MPH?!
Do you have EGT gauges ? Boost retard ? You may be getting into detonation when in high gear where the motor is under the highest load and the combustion pressures really start to climb. It used to be common to have a 'high gear retard' to avoid this problem. This allows you to have lots of advance in the lower gears where the motor is not as highly loaded and then cut back the timing in high gear to avoid detonation.
Might be time for that next big $ pop. Data logger.
500
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