820-830 o2's

[kshef]

my o2's are in the upper 820's to 830's with 17-18 lbs boost, 38psi fuel pressure, 0 knock, stock cat
i assume the stock cat is keeping the o2's high
anybody know anything about the ATR highflow cat?
anybody pass emission without a cat?

 

[turbot2112]

if thats on pump gas i wouldnt be complaining about that. you could try leaning it out a tad. if i could get that on pump gas i would be pretty happy. think thats were you want to be unless your running higher octane.

 

[2QUIK6]

The O2 sensor is just before the turbo, the cat has little to do with O2 readings. Its good to be a littel rich with pump gas, maybe 810s-820s. With race gas, 770-780's, every car is a little different but thats a good ballpark. If you have 0 KR, then try leaning it out some until it start to get just a degree or 2, then richen it back up just a notch so you're right at the edge.

 

[77tech9]

I get 820s all the time on race gas, and around 780s on pump gas (91 oct).

Not sure if I should lower FPS because thrasher says it needs 45... should I try to lower a little?

 

[turbot2112]

id say your right were you want to be as far as your 02s go.

 

[kshef]

this is on half & half 93 and 104 octane
fuel pressure is at 38