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Octane requirement is set by the engine design. Turbo engines can easily enter detonation conditions, so they are usually spec'ed for high octane. Turbo versions of an N/A engine generally use lowered compression and less aggressive cams to stay out of detonation. More sophisticated set-ups will use timing and fuel flow adjustments as well as intercoolers and some sort of anti-detonation fluid.
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Bruce in Houston
'94 Nissan Sentra SE-R w/ $tuff, converting to ITA
'98 Suzuki Bandit 1200S w/ $tuff
'02 Dodge Dakota SLT 4-dr tow beast, stock!
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