I was under the impression that my 10:1 compression could use no lower than 92. So I have been using store bought octane booster, and knowing that that is not going to cut it I am, for price and usefulness, I need other ideas. Atm ,I am planning on adding a gallon of tolulene or xylene. What do you guys think ?

 

Try the 91 and see how it does.

 

You can use regular.

 

I think that 91 is fine for now , but once I finish start running 4lb of boost I don't think it is going to cut it.

 

Best you can get here is 91 our 91 = 93 at s.l. your fine.

 

Cant you get octane booster?

 

yeah , the best here gets it up to 91.7 Unless the **** at walmart called 104+ actaually takes it to 104.

 

All I can get in my area is 91 since the only mom and pop with 93 closed. 91 has been doing fine with a basically stock engine.

 

Depending on the altitude where you live octane ratings change. Because the air density does not promote burn comparable to lower elevations fuel stations can not meet testing levels.

Easy way to tell is if your gas station only carries 86 octane instead of 87.

Long story short 91 is 93

 

That is good information. Looks like I have some research and learning to do on octane testing and rating.

 

Found a place right down the road that sells race gas.

 

Whats that run a gallon?

 

I haven't caught them open yet but when I do I will let you know. I drive by there almost every day. This place looks nice, with a machine shop , welding shop and pumps advertising race and watercraft fuel.

 

nice. what octane is race gas?

 

it is 65 for a 5 gallon pail of 109 unleaded. The cool part is that they are just a few miles from my house.

 

Ya. 91 is fine. I'm running 10.6:1 with only 91. 40* and no knock whatsoever. But in my area, the coop stations have the best rated fuel. A lot cleaner, less ethanol, more gasoline.

 

what part of kansas did you move to?

 

Manhattan, like 10 miles from KSU.

 

E85 bro

 

I can get E85 here. But, it seems like you can't run it with out bigger injectors and pump and a re tune.