Ok , At first when my car started running I kept it at low boost . and I didnt have any fuel issues .

as I played with the power FC , turned up the boost to 12 psi . 100% injector duty .

it was in the 10 a/f all the way through the power band .

then one night I noticed it started to lean out.. I checked my power FC 100 % injector duty . I increased the fuel and tried again and same condition after secondary turbo opens up it starts to lean out . after 6k rpms its in the 13's

so I started by replacing the injectors With

1300's thinking 100% duty for to long I must of broken something , But I got the same conditions ..

after secondary turbo opened up same deal. increased fuel but no difference .

so I tried my filter , Same deal ..

I tried replacing my fuel Pump with a sard 280 .. Same thing after secondary turbo opens up the car just starts to lean out .


I'm at a loss right now as to what this could be... if hte fuel pulsation dampner goes bad does the fuel pressure regulator go bad to? or is the ammount of fuel at the over 12 psi tomuch for the stock fuel pressure regulator ?

 

Sounds like you need a tune on your pfc.

 

at 90 % injector duty using 1300 secondaries , and 550 primaries I should be dumping pig rich . if it was something as easy as increasing fuel in the tune I wouldnt be here LOL

 

Your profile says stock pfc tune with minor adjustments. If you want help on this site, you dont get to be an ***. Keep that up and no one will help you.

Time for an apology.

 

whats the condition of the wide band sensor?

and i dont think youre being an ***. some people read too sensitively.

 

LoL I didnt mean to sound like an *** ,

the wideband is fine I got it double checked whne I took the car to a dyno after I put the new injectors in thinking hte problem would be solved but

the dyno read the same as my wideband it starts to lean out after the second turbo opens up .

 

Swapping out the fuel pump sounds like a good idea to me. Install it and report back.

 

already did swapped the walbro 255 with a sard 280 and the same thing happens

 

Beyond the normal mechanical things, I need to see Datalogit logs to give more advice .

 

would a bad fuel pressure regulator be among normal mechanical things? or what about a loose/broken secondary injector wire could that be causing this ? or would it go lean with only the primary turbo if its only running on 550's ?

 

Whats your fuel pressure?

How is your fuel pump wiring? What voltage is getting to the pump?

 

power to the FUel pump at IDLE , is the same as the power FC is reading for the alternator charging .

with the car off but ignition on its 12.6 bat , 12.5 at the pump .


The fuel pressure I dont know.. I was going to get that tested this weekend but hurricane and all kind of messed up my day .

but I've just never heard of a Fuel pressure regulator going bad. so I'm skeptical a bit

I know about the FP not getting enough juice . but it doesnt seem like thats the case , and I know the walbros tended to go bad so I swapped that out

now the injectors are another thing I think could be a miss . not the injectors themselves but maybe a loose plug?

but if the car was only running on Primaries would it not go lean at 12 PSI with the primary turbo?

 

Good.. calll.... before I did it I double checked the voltage to the FP , and it lost .10 v between battery and fuel pump . I didnt think it was the issue , But I did it anyway ..

and.... now... IT WORKS.... Im getting 10a/f all the way across the powerband ofcourse it needs a tune now ..

I'm running rich every where . even at idle I'm running richer .

But the problem is gone


man do I feel like an idiot . for not trying this first.


But one thing is the FP wiring had already been tampered with

 

 

Hey guys,

what exactly was done here? Did you rewire the pump or replaced the FPR?

 

Yes it is helpful to list what you did to remedy the problem.