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Originally Posted by politicophile
....High test gas does nothing to increase power: its only function is to prevent highly stressed engines from knocking.  |
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Originally Posted by Redjake
High octane gasoline will most definitely increase power. It's usually only at the "power band" or "peak power RPM" in engines. For example, a Dodge SRT-4 with the Stage 3 Turbo kit produces around 310 horsepower with 93 Octane gasoline, but if higher octane gasoline (over 100) is used, it boosts the horsepower to 350. Found the source:
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In case you ever want to turbocharge or supercharge your Mustang, some of this might apply
Politicophile gives the reason why, whereas Redjake makes a point but without any explanation of why ...otherwise it would be clear that the reason the turbo car made more power was only because of reduced knocking on higher octane.
An engine ECU will pull timing when it detects knock and that causes a pretty drastic reduction in power. So if you use higher octane, there is less timing pulled (because of reduced knock). You can also run higher boost but most factory ECU's don't increase boost automatically with more octane though pulling less timing can also have that effect. In my turbo Supra the ECU will not automatically increase boost with higher octane, but I can turn up my boost controller to whatever I want (if I turn it too high for the octane the ECU will pull timing) and when I run racegas I can boost much higher and make more power; in my case roughly 500rwhp (@ ~18psi) with 93oct and over 600rwhp (@ ~28psi) with C16.