ok i just put 100oct in my car. the tank was empty. i normaly run 93oct and my afr's are from 11.4 11.5 to 11.1 10.9 at red line.

now with the 100oct in the tank my afr's are 11.8 12.2. im running the same boost 23psi..

i am also tuned.

i was told i can put 100oct in the car and turn the boost up a bit. i did not do so because it is already to lean i think. so whats going on here???? help would be great

 

anyone?

 

What are you reading AFR's with.

 

my wideband. innovate lc-1 with xd16 tapped into down pipe.

 

Thats beyond strange. I have no idea what could be the problem as it should not to that. Higher octane (or lower) should not affect AFRs. Running 100+octane should allow you to run leaner because it burns slower (and you can turn up the boost).

 

well i am lean right now. with 100oct in the car. im like 12.2 12.0 at wot. i did not turn the boost up. still on 23 psi

 

i thought adding higher oct would make the car run richer there for turning up the boost to make it lean out a lil bit and make more power.

 

do you have some way of changing the tune or map you are running? I mean how did your afrs change?

you don't mean your afr changed just from the different gas do you?

 

yes.

car is tunned. i run 93 oct and my afr's are normaly around 11.4 and 10.9 to redline running 23psi

i then filled the tank with 100oct and my afr's when leaner. 12.2 to 12.0 at the same boost leavels

 

Are you 100% positive that you filled up with 100 octane and not something that has less octane than stated? Did you get it from a can or through the pumps of some sort?

 

So you changed NOTHING other than throwing the 100octane in

 

i got it at sunoco. 100oct.

 

right. only change to the car is 100oct nothing NOTHING ELSE. because i saw my afr's was lean as hell so i did not do anything more

 

So weird.

 

do you think maby it was just a freak thing?? should i go try it again??