I am tuning this guy's car and pretty much hit a brick wall and not sure as to what to do. Its a fully built gsr block with type r head, sc61 turbo with RC 750cc's. I got the car idling perfect and AF is good while revving and raising the rpms up to 4k. Once you are driving and hit light-WOT it immediately leans out to the 17-18's and falls on its face. No matter how much fuel i give it, same thing happens. The timing is set, no CEL's, fuel pressure good, and not sure what else to check for.

 

hes got at least a walbro 255 right?

 

Yeah, but see, this issue is happening with 20-100% throttle. Tip in adjustments dont make a difference either.

 

is fuel pressure good while driving. or good just sitting there and reving.

 

i had the same prob. put the gauge on and found the pressure was dropping at max tq . put a fpr on and set it to 80psi and no problem.

 

AEM Wideband?
Hondata S300?

Plugs look like what?

 

Plugs look good, aem wideband, s300. I changed out the FPR to a stock one and the fuel pressure went up from 48 to 52psi and it richened out a little but still not getting enough fuel. The owner of the car just told me that the ECT sensor is bad which might explain why it does this when the car gets fully warmed up. We'll see later today.

 

check timing too

 

Make sure you post this in the Engine Management & Tuning section as well, homie.

 

ECT sensor fix did nothing

 

Interesting.
Car isn't a black ITR is it.

 

Nah man, what makes you say that? haha I told Doug about it and he said he's gonna talk to Shawn. I dont know where he's gonna find a fuel pump to use so good luck with that.