is this safe to do at the track on a stock evo? maybe 50/50 ration or something?

 

works fine, leaded gas may eventually kill O2 sensors.

 

I run 5gal. of 100 octane unleaded and fill the rest with that 91 octane crap. It runs a lot smoother.

 

Do not use leaded gas in a car that has catylitic converters, it will ruin them with the quickness.

 

Unless you plan on uping the boost somehow then race gas is useless. Sire your car loose all chance of knocking but it shouldn't anyhow with how rich the factory made it then with the race gas you are just compounding the issue. I bet you run slower with race gas if you are trully stock with no boost control.

 

stock, its a waste of money.. unless your running in 150 degree heat or 10,000 feet above sea level..

 

Basically there's no reason to run higher octane fuel unless you're experiencing engine knock - if you cranked up the boost or advanced the ignition timing to the point of inducing knock then you can run up to 109 octane unleaded without hurting the Cat. Though you'll probably only need half 91 and half 100-109.

 

Evo's are made to run on 93 octane. So if you are stuck with 91, like California owners, your car will run better if you boost the octane.

 

you can run race gas at the track, no problem. just don't do it very often. i run it and have yet had a problem. even if it does screw up the cat in the long run, i'm just going to get a high flow cat in it's place. no big deal.

 

u better use a wideband and a afc to run this safely in your car and yes dont use leaded gas 100 oct should be fine.

 

go for it

 

race gas will richen up the mixture a lot on your car...be sure you have a point in doing that such as abilities to moniter and modify your a/f ratios and such.
Dave

 

pointless and will make the car slower. (richer = slower) and evo's already come very rich.