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Jordo! · 07-19-2013, 04:09 PM

It's unclear that going from 91 to a higher octane will convince the ECU to yield more spark advance -- thus without planning to tune for higher octane levels, I wouldn't worry about it.

Lower octanes, however, run the risk of knock under load, and thus are not recommended.

Also, in what few empirical tests I've ever found, even good octane boosters raise octane by no more than a .5 to 1.5 points. There's a thread on here somewhere with a link...

Finally, depending on the additives, it may wreak havoc on the fuel sender. I say, pass.

Read up on octane and its relationship to engine tuning independently -- good stuff to know about.

07-19-2013, 04:09 PM	#6 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 417	It's unclear that going from 91 to a higher octane will convince the ECU to yield more spark advance -- thus without planning to tune for higher octane levels, I wouldn't worry about it. Lower octanes, however, run the risk of knock under load, and thus are not recommended. Also, in what few empirical tests I've ever found, even good octane boosters raise octane by no more than a .5 to 1.5 points. There's a thread on here somewhere with a link... Finally, depending on the additives, it may wreak havoc on the fuel sender. I say, pass. Read up on octane and its relationship to engine tuning independently -- good stuff to know about. __________________ Enjoy it. Destroy it. Last edited by Jordo!; 07-19-2013 at 04:12 PM.