Leaning out under load
 

the car seems to have good air/fuel when its idelling, but under load it leans out to around 16. Just installed a new aeromotive FPR, but the car still leans out. Any ideas? fuel pressure is set to 55psi. Help!

few questions are you turbo? if so what mods do you have done? also what wideband are you getting your numbers from some of them have a adjustment it may be off. but if you are turbo and your going to 16 on a fully functioning uego then DO NOT drive until this is fixed you'll end up causing major damage

7mgte engine. The mods concerning this problem are, walbro 255 fuel pump, 550cc injectors, Aeromotive FPR, Innovate wideband air/fuel meter, and i'm running a mega squirt system. I don't drive the car because i just finished rebuilding the engine. What would be a good fuel pressure to set it at? stock is 47, no?

you shouldnt be leaning out with 550 injectors. whats the FPR suposto be set for those.. if you have larger injectors and a mega squirt set at stock FP. no wounder your leaning out.. sounds like you need to re-tune your mega squirter tabels

the innovative uego has a calibration procedure did you go through this procedure correctly? google it we install these all the time and when someone unhooks their battery or something they come in and complain that their car running rich/lean and we have to re-calibrate the gauge

I'm gonna try to recalibrate the wideband tomorrow morning, we'll see how that works. I'll also up the fuel pressure to just over 55psi.