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So if running a higher octane gas doesn't increase hp, how does using a 93 octane tune help performance? Is it just more aggressive due to the higher resistance to detonation?
 

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timing maybe and other parameters thats in the tune to bump the power? someone may chime in
 

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The only thing higher octane fuel does is burn in a more controllable manner. This helps reduce the risk of detonation (or knocking). Many factors contribute to detonation including IAT, air/fuel ratio, timing, etc.

With a performance tune the air/fuel ratio, timing and other parameters are set more aggressively than your stock tune. A side effect of this is increased risk of detonation. The way to counteract this detonation risk is to run higher octane fuel.

In other words, the extra hp from a performance tune comes from the tune. The higher octane fuel is simply to keep your motor in one piece.

Check out this article for a more in-depth explanation of detonation and octane: Detonation Explained
 
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