Quote:
Originally Posted by JSH
At the risk of seeming redundant, higher octane is worthless unless you tune the ECM for it, e.g., add spark timing advance. The difference between 91 and 93 is negligible and does not justify a tune IMO
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This is dopey talk here folks. It has merit if you are tuned and never see any knock. But in the real world where DA and climate changes and cars that might not see knock on the dyno, might see it on the street from time to time, the octane booster will help you keep the timing you have and make the car run more consistent. So if on the street you are pulling a few degrees from whatever scenario, then yes you will be much better off with the octane booster and making more power than you would if the car was pulling a bunch of timing.
Octane booster should never be used to make more power, just to keep the power you have.