87 vers 93 octane fuel

[GM Master Tech]

Has anyone ever done a dyno test for 87 octane fuel vers higher octane fuel? I think the results could be interesting

[Gh0st]

No, but I know for a fact that these things have way too much timing in stock form. After logging with HPtuners I'm running nothing but 91 octane minimum.

[GM Master Tech]

Thanks just what i was wondering.If thats the case it would have to be able to make more power with higher octane fuel ! Just how much i would like to know

[obermd]

Thanks just what i was wondering.If thats the case it would have to be able to make more power with higher octane fuel ! Just how much i would like to know

I think the real question is how much power is being lost to knock retard when running on 87.

[Hoon]

I don't think any HP test has been done.

[OnlyTaurus]

Never used anything but 93 octane. Drives like a dream with it.

[GM Master Tech]

well i know for sure GM could never have successfully marketed that power train with out saying it would run on 87 octane

[obermd]

It does run on 87 octane, just not as well as it does on 91 or 93 octane, especially in the summer heat.

[GM Master Tech]

My concern is the cracked pistons that are turning up now !

[montess1]

Has anyone used ethanol free 90 octane fuel ? It should do better than pump gas with 10% ethanol as you lose some power and mileage with the ethanol fuel.