Rovergauge & AFM Question

[v8s4me]

The RG output is showing my MAF CO Trim at 1.92v...



The Steve Heath manual shows the idle voltage to be in the range 0.5v to 1.5v. Is the " MAF CO Trim" voltage the same as SH's "Idle voltage"? If they are does this indicate I may be over-fueling? The emissions figure is OK and fuel consumption is normal so I don't think I've got an issue.

Am I fretting over nothing here?

[spikep]

How come you have fuel map 2? I thought It should be fuel map 5. That’s what my Griff is.

[v8s4me]

It's a V8S but this is usually the best forum for Rovergauge questions.

[blitzracing]

Hes running a non catalyst map- you will see no lambda trim accordingly. The CO trim is just like an idle mixture screw- it simply tweaks the mixture from idle to around 2500 rpm. 1.92 volts is high and would tend to make the car a bit rich, but if you are happy with the gas test and idle then its not a problem. The way the CO trim screw works is basically the same as the Catalyst fuel maps long term trim value, but in this case the ECU is self adjusting so it effectively alters the AFM trim screw value internally, and the manual adjustment via the AFM is ignored on Map 5. Id suspect the Steve heath idle value would be the AFM airflow output and not the CO trim that is on a separate wire output from the AFM.

Edited by blitzracing on Monday 27th May 21:17