chevykiller

He knows what he's doing Stan...LOL Remember, the NAME of the fuel doesn't always mean the actual octane count. 104 unleaded race gas is going to be your limit and is actually about at the 102 octane level...

STANMAN

I know I run it in my SRT with no problems, but then again, when I am running it, I have my electric cutout open, so it never sees my cat or 02 sensors, lol. I know it makes a big/noticable enough difference in the SRT to justify the price of the gas. (it picks up about 12HP and 20 foot pounds of torque with the cutout open, how much is the race gas vrs the straight exhaust is questionable, it's probably mostly the exhaust).

sidmanic

Going to a higher octane will allow you to advance your timing. "1 octane=.66psiBoost(11HP),1 degree of timing(4HP),.5AF Ratio,20degrees Ambient,30%Humidity,1000'Elevation". This is straight from Kenne Bell and pretty much their rule of thumb when it comes to tuning. Using this, you are only going to get about one or two degrees of timing before your AF will start to be too lean. I might go one degree but after that I would have it hooke up to an AF meter to make sure its within spec. You will probably be able to get by with Supreme Unleaded and get the same results.

andyman

what are you runnin in that thing?

AmericanMuscle4.6GT

[quote][Going to a higher octane will allow you to advance your timing. "1 octane=.66psiBoost(11HP)/quote]


so by my nOOb logic, tuning the engine from stock 87 tune to 93 tune would give you an additional 55hp, give or take?

sidmanic

Running higher octane gas lets add more timing and a leaner AF due to the fuels lesser tendency to detonate. But just like most things on the engine, there are limitations to how much timing, how much boost, how much fuel, etc. you can add before the engine pops. Don't change anything unless you know exactly what the result will be and what effect it will have on you motor.