Need some datalog help .... Seems rich to me or am I wrong

[engineermike]

Cot usually activates within a few seconds of going wot. Doesn’t really matter what you were doing just prior. They heat up quick at wot. Log the calculated cat temp and you’ll see.

Sponsored

 

[dragonfueled]

Just a little update. Tossed the stock tune back in and it's a perfect .84 dropping to .82 at the very top end. Did two wot pulls in a row and the lamda remained the same. If it is some kinda protection kicking in they must of lowered the thresholds way lower then stock.

 

[engineermike]

Is this supercharged?

 

[dragonfueled]

Is this supercharged?

No it's literally a stock mach1 with high flow cats lol nothing fancy.

 

[engineermike]

Ok @horsepower addiction said it, that the tuner might have just commanded .76. That’s between you and him. .76 isn’t unheard of, roush, ecoboost, and predator command as rich as 0.7. It’s a little rich for na but won’t lose much power and might even gain a little if it delays cot or allows more spark.

btw the 60+ lb/min airflow seems very high for a stock na engine.

 

[dragonfueled]

Ok @horsepower addiction said it, that the tuner might have just commanded .76. That’s between you and him. .76 isn’t unheard of, roush, ecoboost, and predator command as rich as 0.7. It’s a little rich for na but won’t lose much power and might even gain a little if it delays cot or allows more spark.

btw the 60+ lb/min airflow seems very high for a stock na engine.

I literally was thinking that also. My gt only gets to like 42 with an 18 manifold.
Stock tune also showed 60 on the log.
I don't think .76 is commanded though and the stft are .88 and long is .95.. why would it be pulling 17% if it's commanded

 

[engineermike]

I literally was thinking that also. My gt only gets to like 42 with an 18 manifold.
Stock tune also showed 60 on the log.

.88 x .95 x 60 =50.16
I could buy 50 na but 60 is high.

Sounds like your tuner owes you a better maf transfer function. Or your fuel blend isn’t correct.

I don't think .76 is commanded though and the stft are .88 and long is .95.. why would it be pulling 17% if it's commanded

That’s not how that works. If they commanded .76 then fuel trims will do what they must to make it hit .76. That’s just saying that it’s having to pull 17% because if it didn’t it would be .65.

 

[dragonfueled]

.88 x .95 x 60 =50.16
I could buy 50 na but 60 is high.

Sounds like your tuner owes you a better maf transfer function. Or your fuel blend isn’t correct.



That’s not how that works. If they commanded .76 then fuel trims will do what they must to make it hit .76. That’s just saying that it’s having to pull 17% because if it didn’t it would be .65.

Ahhh ok

Sponsored