Quote:
Originally Posted by Roxy86
I assume, this is a benefit for cars without a tune also?
There is a 103 octane pump near me... and I could fill up a 5 gallon gas tank next time I go to the track.
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We never tuned our car. It was just a curiosity due to how "rough" the engine sounded. Based on this speculation, it's possible the engine was tuned for 93 octane from the factory but has provisions to run 91 octane on the low end.
Quote:
Originally Posted by wheelhaus
What about 93 octane? Of course it's better than 91, but I'm wondering how well it fares compared to 100, for instance, is it 99.9% as good as 100, or only marginally better than 91...
That's not a bad idea at all. Even if there's no additional power to be had, it's a nice safety net for a track day.
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93 octane is a good octane rating for the car. We have a 10% ethanol blend with 91 octane which is worse than straight 91 octane. The few gallons of 100 octane will also help with any sort of minor blowby that could cause a drop in octane during cornering as well. Again, it's about buffering the system. You use race tires, race brake pads, race brake fluid. Why not run a little race gas too?
