Not taking it personal, or getting emotional - thought I'd drop back in for a second. But, programmers allow you to take advantage of higher octane fuel.

I think you just stated where our difference is coming from. I never said the fuel makes more power - I said the programmer allows for more ignition timing (among other things) that let's you take advantage of higher octane fuel.

http://www.centuryperformance.com/timing.asp

I think Mike Troyer (many others) would disagree that you won't make more power with higher octane fuel and a programmer. Hell, that man makes a living doing it!

 

Bryandon trust me when I say not to feel bad, I use to belive just like you. Infact I spent 25 years of wrenching holding those same beliefs.

I sitll made power, but it wasn't working as I thought it was with my understanding. and dumped a bunch of money needlessly into fuel tanks.

 

damn Mag i'd say you hit a nerve

 

See that it though, it's not taking advantage of anything when it actually an inferior product.... the neptane is what you want. But you cant have the higher neptane (lower octane) if you have to much compression for the fuel....
However, you want more compression more than you want the neptane.. so if you get a chance ot increase the compression, then do it and then it's worth the HP gains to accept the negatives of less neptane in the 91.

 

just as a refresher

89 octane = 89% octane and 13% Neptane
91 Octane = 91% Octane and 9% Neptane

Or equivelent becasue not all refinereies use actuall neptane.

 

Ohh and those ratings are rough estimates, they arent even with in the 2% difference, for thier tolerances either.


It's illegal, but I know it happens some what frequently, where a station dispences both ratings from the same tank. Or fills both tanks with the same ratings if they cant get a truck in soon enough. Funny how no one notices.

 

It's only illegal if they put lower octane fuel in the tank than what is on the pump sticker. It's perfectly legal to put 91 octane in the 87 tank.