I have been configuring my modified 350cid engine to run in straight open loop using the 6E mask with just the MAF sensor but I have noticed that the wideband AFR changes with ambient air temperature which is not unexpected. I have read other posts discussing an intake air compensation table but this seems to be on an 8D mask. So the question is if there is some table in the 6E that I do not know about that will provide a correction in the AFR over changes in the inlet air temperature or what are you guys doing that are using the 6E mask in open loop only to prevent the AFR from changing with inlet air temperature changes.
Thank you

 

I took a quick look, it doesn't appear that there is an IAT compensation for fueling.

RBob.

 

So then with the 6E mask you are stuck with the AFR varying with inlet air temperature which could be reasonably significant depending on the delta temp. Otherwise you would need to put it back into closed loop to give control back to the ECM through the BLM feedback.

Thanks

 

Yeah they came with that super slow reacting MAT sensor so it would be useless anyway

i havent seen air fuel change that significantly with air temp tho. Maybe slightly from hot to cold environment. But I usually check the tune from hot summer to cold winter when at the track, as with the increased air density in winter you can make bit more power and get more aggressive with the tune

 

Not that is matters since it cannot be used for compensation but I did move the MAT sensor off the plenum to the intake system before the TB. I do not use the EGR and I did it simply so I would not have to take the plenum apart to get to it if I needed to.

The MAF sensor itself could reduce the effect on AFR changes with ambient air temperature depending on its specific design or if it is just an old and tired MAF. I will take a look at that and try a different/newer MAF sensor.

This car has turned into science project anyway.

Thanks

 

IAT only serves to be one of the checks to activate EGR anyways on 6e anyways, right? No reason to even mess with it. The heat-soak of the plenum is expected afairemember