always pig rich.. need help.

[malloynx]

here is the deal. i have been trying to tune my car at 18psi (67mm turbo) and no matter how much fuel i pull out with my maftpro; it still runs in the 10's @WOT. i'm runing a walbro fuel pump, 550's, aermotive FPR, yada yada yada.

my fuel pressure at idle is 30psi and i have between -15% and 20% pulled out across the board. the pro works just like an AFC as far asa fuel is concerned.

what do i need to check to get this right.. i can actually smell fuel when i'k boosting hard.

please help.

 

[chevyeater]

Is the stock ecu happy Mike? Vf = 2.5

I assume you are making the changes to only the WOT portion.

Also, how rich does your wideband read and does the logging in the Pro match it?

 

[malloynx]

ecu is happy. i'm only making changes at WOT.

I'M reading around 10.4 @WOT..

I just tested my stock o2 sensor and it's out of spec. reading way high on the ohms.. can this be a cause

 

[IJ.]

02 may be fouled from running rich but usually this will cause it to read at stoich all the time.

 

[malloynx]

here is an update. after talking with dr.j i removed vac line from my AFPR and set it to 35psi, this gave me about 25psi with vac on.. (still within stock specs)

this really seemed to help alot and i'm now in the 11's after having to add fuel via the maftpro. i think i got it..

at cruise the vf is still happy too, but at idle i'm seeing 4.45 volts on the vf output.

 

[atlpd3147]

well did everything work itself out?

 

[jetjock]

ecu is happy. i'm only making changes at WOT.

I'M reading around 10.4 @WOT..

I just tested my stock o2 sensor and it's out of spec. reading way high on the ohms.. can this be a cause

Say what? You can't test a narrow band O2 sensor using an ohmeter. In fact you can damage it that way. It's always better to test it in the car but the best way to test it off the car is using a voltmeter and a propane torch.