I put some GVR4 510cc 's in my car along with an AFC and the 2G MAF

I have Hi Throttle +50 % across the board and the car still leans out on 12lbs from a 14b anyone have any suggetions on what the underlying issue could be ?

If I floor it th A/F's drop down to like 12.2:1 or so and then climb into the higher 12's and sometimes 13's or 14's ..

Does this sound like a Bad MAF ?

 

it could be any of those three lol, but my guess is the afc, since a 50 percent increase in fuel doesnt change it. there is a wire that you have to cut in half for the afc install, one of the maf wires, maybe thats a bad connection, make sure thats fine, and all your connnections are soldered. youre reading this from a wideband right...(just making sure)

 

If afc is wired correctly then the correction limits may need to be set. The factory correction limit is plus or minus 3%. so when you correct for 50% you are only getting a 3% change. try changing the correction limits to plus or minus 30%. that setting allows full scale changes.

not to be rude but you shouldn't be tuning this car yourself. your obviously lack the tuning knowledge necessary to tune correctly.

 

i just dont think he is familiar with afc tuning.

 

it could also be where the wideband sensor is its only like 8 inches away from where the down pipe ends I think its reading outside air and going lean I think the sensor needs to be move a little further from where the down pipe ends to get an accurate reading you might be running rich and the wideband not getting the correct reading.

 

oh its open dp?

 

Car is open DP but I have tuned many a car with the sensor a short distance from the end and it gives a good reading while WOT ..

I do not lack the knowledge to be tuning the car myself . I have enough to be able to tune whatever I would like ... Also I did read the instruction manual and understand the correction limits and what not . They are set @ 30% that was done before I even fired the car up with the AFC .. as well as all the other factors that need to be changed ..

I have recalibrated the TPS and pulled some timing out of the car as well as Adjusted the MAF screw in and all seems to be working a bit better . The AFC does not give me the ability to tune individual load cells it gives me a WOT adjustment that works for both higher and lower Karman rates ...

I turned the Boost up to 15psi and now the car is running richer because of the airflow ..

Car now sees a 11.5-12:1 A/F across the board but still has a few issues that need to be ironed out . Runs much better but I solved most of the issues now . Gonna try to tackle the FMIC install in a few minutes ..

Thanks for the help

 

Is the mas hacked at all.
If you richen the 500-1000 low throttle rpm point all the way will it bog the car down?
Are you sure the injectors are 510s.
All american vr4s came with 450s.

 

I got the injectors from Brothers they assured me they are 510's ...

Yellow top etc ...

I have low throttle @ about +25% tappering down to like +12-15% at redline

Throttle settings are 30% low 65 % high

 

That sounds about right for a 2g mas with those injectors on stock 1g mas compensation.