What can throw off the fuel map !

[v8killer]

hey guys i have a problem with my car following the fuel map ! down low it will follow changes but wideopen it will be lean even when running stock boost. now i can jack the fp up to get it to follow it but at stock boost shouldn't it still be on it ?

255 fuel pump "not rewired yet"
adj fpr set to 52 base
stock 450 inj

 

[toofast82]

What type of adjustable regulator is it? It's possible your pressure is not rising 1:1? Your profile said an ebay one, so you may want to look into a better one. You can try swapping your stock regulator to see if it solves the issue?
I would think a bad MAF sensor could put you on the wrong fuel map as well.

 

[v8killer]

Hey toofast88,

you were just replying to my other post i didn't think to many people would look at my other thread so i open another one. this car is driving me nuts. well i had to put the ebay fpr on to fight the overrun issue with my pump, but it does rise i tried it running with air put to it ! the maf is unhacked and has been working great with no codes.......

 

[toofast82]

Hey toofast88,

you were just replying to my other post i didn't think to many people would look at my other thread so i open another one. this car is driving me nuts. well i had to put the ebay fpr on to fight the overrun issue with my pump, but it does rise i tried it running with air put to it ! the maf is unhacked and has been working great with no codes.......

If your positive about the fpr, okay then! Like i said in the other, modify the complete fuel map to stock 2g. Do every one because i know tunerpro there are like 4 maps i believe or is that just timing? Your probably catching a load point with more aggressive settings.

 

[v8killer]

well i put in a stock bin file so eveything is stock ! so i should be runing rich as h-ll with 52psi base fp ! but i'm not ! could it be a boost leak. i plan on checking it when i can get to a hardware store.

 

[v8killer]

Could a bad 02 sensor cause it to be lean wideopen !