Tuning A-Code VAMF for Better Fuel Economy

[boosted94]

Since I've replaced a B code with an A code my fuel consumption has dropped from 25mpg to 11-14mpg. My wideband shows full rich 10.0 at idle, full rich driving around at less than 25% throttle, a little lean under WOT and full boost (15.8-16.3), and full lean when I liftoff the throttle after WOT (19.9).

I had some time and tried opening the VAF and turning the wheel clockwise (leaner) 3 'clicks' but it made no difference. I haven't used a multimeter to check voltage, since I have a wideband I figure I can just drive around after changing something and see if it made a difference.

Does anyone else get mileage this bad? Has anyone had any success getting better fuel consumption? If I keep turning the wheel on the VAF towards lean I should be able to get stoich at idle, correct? The VAF how-to guides I found focus on getting it to idle and run properly. Mine idles and runs fine but sucks fuel like a motor three times its size.

Stock BP05 motor with VJ20, GTX ECU, 360cc injectors, 255lph fuel pump.

[Boosted Escort]

Sounds like the vaf is electronic board is bad.

[boosted94]

Maybe. It's a remanned carquest part, listed on ebay "fits 86-88 rx7 turbo", there is no Denso sticker with an "A" on it. I turned it 10 more clicks clockwise and it runs exactly the same. Runs at stoich immediately upon startup and gradually drops to 10.0 AFR within 30 seconds of idling.

[mazpr]

The Turbo II afm will run pig rich, if thats what you are using.

The infamous safc will help up to a point.