Can I run 100 octane from the 76 gas station safely? I currently have LT headers, cold air intake, and a couple of other bolt ons, but no upgraded internals.

 

u could but it won't help you any. Its also possible you will loose performance. The higher the octane the slower it burns (something to taht effect). It would be better for a high compression engine or if your running some sort of boost where you can detonate if you run too low octane.

 

run 4-5 gallons with 91 octane and that should bring you up to 95 octane . It will help clean the injectors. besides $4.25 a gallon is high.

 

sweet... Is this from your personal experience?

 

I run about 3 gallons of the Unocal 100 in a tank of 91 all the time. Never
had any problems and the car responds really well to it. Never pings,
even on hot summer days.

 

Won't help, won't hurt anything, and it doesn't "burn slower" (a popular misconception - but octane does not correlate to burn speed).

You would just be wasting your money. I'm running close to 11:1 on a 7,000+rpm solid roller motor, and normally aspirated HP peaked (as measure with numerous tuning pulls on an engine dyno) with 94-octane fuel. Moving up to 100-octane did not allow any additional timing, nor provide any benefit for any significant changes in A/F ratio, along with timing changes..... Which is what you would need to do to see any more power.

Run your car with a scanner, and look for knock retard. Use only the octane level that allows you to run with no knock retard. Anything above that level is a waste of money.

 

So I wouldn't see any improvement from it?

 

I've always wondered the same thing. Thanks for the great insight Fred.

 

If you want to do some good, just go buy a gallon of xylene, and put that in, and then 3-4 gallons of gas. should get you to 94-95 or so octane, and it will clean out your fuel system nicely Anything less than 30% xylene wont do any kind of harm to your fuel system

 

Well I can atest to the fact that it won't hurt or help, here in japan on the military base all they offer is 99.5(at a 1.63/gal )
and it is all my car has seen for 50k miles. Can't wait for my procharger to get here though, the 99.5 will help then!