ORIGINAL POST in Forced Induction:

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.

UPDATE:
Replaced the FPR with a stock one and fuel pressure went from 44 to 52 psi. The AF is not as lean but it still wont richen out to what i need it to be. Now she'll sit at about 15-16:1 part throttle and 13-14 WOT. I can dump as much fuel as i want in the fuel tables but it doesnt affect the part throttle.

If i make changes during idle or holding a certain RPM while sitting still, the AF will change to whatever i want it to, and the same goes for cruising. I wanna say its the fuel pump, but im not touching it right now, its gonna be on the owner of the car to change that out.

 

What tuning software are you using?

 

Change fuel pump then rest. If not pump, change wideband sensor and re-test.

 

S300. I tried my ecu and his and its the same thing. We are gonna switch out fuel pumps then try again. I swear thats what it is but you never know. If i have to use another wideband, then im gonna have to rip mine out of my car.... damn.

 

I replaced the fuel pump and still a no go. This makes no sense to me that before the car is warmed up, it will go into the 11s in boost and part throttle is fine, but as soon as the car is fully warmed up, everything goes to ****. part throttle AF is in the 15-16s and boost 14s. Im stumped. I got the idle and cruising AF's on point but thats about the only thing this car will let me adjust.

Replaced FPR
Replaced Fuel Pump
No CEL's

 

How are the temperature compensations set up?

 

Are your injectors low or high impedance ?
Do you have a resistor box installed ?
Have you tried another wideband ?

 

I would check/replace your wideband and the temp compensation settings for med/high load.

 

They are RC 750's so no resistor box installed. I didnt get a chance to play with the compensation table BUT again, no matter how much fuel i add in those problems areas, nothing changes.

Settings for the open loop water temp table is 0 once the car is warm.

 

Are they low or high impedance injectors ?
Are they sl9 or sh4 or pl9-750 ?

 

Sh4. The guy picked up the car and took it to a local tuner that has a dyno. The car is fine and producing 400hp so far. I wanna know what setting i overlooked so i can learn from it.