lean/rich wide band

[1gdsmracer]

i have an lm-1 that came in my car conected to my maft pro and i was wondering what is a good reading at idle for air/fuel. i have 780cc injectors and i havent set my main scale im seeing like 48 air fuel and 20.8% on o2 i didnt run for long just idle it. i need to a wide band any help would be great.

 

[jongreene]

at idle and out of boost optimum A/F ratio is 14:7

 

[Black99gst]

14.7:1 @ idle (open loop ECU) i think WTF

11.1:1 @ WOT (closed loop ECU) Maybe the otherway around on the open/closed loop thing, but def. got the #'s right!

 

[snowborder714]

^ You are correct about the loops

Here's how you know the ECU is in open loop (any one of these are true):
-Throttle position too high (varies by RPM)
-Airflow too low (units are tricky, but it's very low)
-Coolant temp < 51F
-Coolant temp > 228F
-The O2 sensor did not switch around 0.5v for over 128 seconds while running in closed loop mode. In that case, the ECU locks itself in open loop mode.


Also you should see 14.7:1 at cruise.

 

[1gdsmracer]

well i wonder if my 02 is in the wrong place or its going bad ### the plugs are black and wet with gas. i havent got a chance to drive it yet because ive changed injectors,turbo,fmic,exhaust,wastgate all this at once. so i could have a vacuum leak i mean it could be alot. i know how to build engines and bolt stuff on but i need lots of help with this dsm. its my first and im trying to do it all right. Thanks for any help

 

[jongreene]

whats your mod list, fuel setup etc.?

 

[1gdsmracer]

i changed the wide band o2 and bam it works im seeing 13.2 to 1 at idle and 11.4 to 1 at wot.

 

[jongreene]

Still a smidge rich at idle, but much better than before