my fuel set up:Rc 550's
AEM fpr
Walbro intank 255hp
Crome Pro
Attempted to street tune my car today and as soon as i hit 6k rpm it begins to lean out.My pump is workin but iam getting high fuel pressure (70psi) but then fuel pressure drops to 40(psi) which leans out at boost. Has anyone have this problem before?my next trial is switching down to 440's unless sumone can tell me how to solve this problem.

 

Why are you trying to run 70psi of fuel pressure? is that at idle?

you have the injectors maxed out in crome?

 

yes its 70psi at idle...tried lowering it but engine seems to die out if i go lower.My tuner said they were close to maxxing out and yet still running lean.

 

Well you shouldn't be running 70psi of pressure at idle. You should be running about 40psi... why not just add fuel at idle in crome rather than bump the fuel pressure way up?

What are you using for a wideband?

 

yeah i know fuel psi shouldnt be that high...My tuner tried both through crome and manually with the aem still leans out and we are using LM-1 as wideband

 

You havent said much about the rest of your set up, but here are a few things you should try. 1st I'd set my base fuel pressure back down to 40 psi and correctly tune your idle . You should'nt need any thing more than that if your injectors are sized correctly and working correctly. 2nd I would make sure you are not running a resistor box on what I assume are saturated injectors (this is a common mistake I've seen happen a few times). 3rd if none of these work you need to pull your plugs and make sure you don't have a defective injector. (either sticking open or not opening)

hope this helps.

 

Oh yeah i knew i forgot sumthing...I have Drag Gen 3 Kit on b18c motor.Iam not running a resistor box and yes my injectors are saturated.Yeah we are gunna pull the plugs and try some new 440's and see what happends from there.thanks for your comments.