Avgas 100LL?
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Joined: Oct 2025
Posts: 427
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From: South Florida
Generally on a car tuned to run the 100LL you assume the cats have been removed.
As a default, increasing the octane will not gain anything unless you are octane limited. You'd be better served by mixing some E85 in there, it's effectively about 105 octane, a slight blend to bring your tank to E25-30 is a similar boost in octane but often won't push the car lean enough to cause issues.
Are you just doing it for fun or is there a goal here?
As a default, increasing the octane will not gain anything unless you are octane limited. You'd be better served by mixing some E85 in there, it's effectively about 105 octane, a slight blend to bring your tank to E25-30 is a similar boost in octane but often won't push the car lean enough to cause issues.
Are you just doing it for fun or is there a goal here?
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