wideband gauge readings

[starfish]

Ive cchecked some threads but I cant find any answers for the 420A w/t.I hooked up my wideband and I'm not sure whats a good reading.I have stock injectors,stock bottom end,t3/t4 turbo 7psi,intercooler,12;1 blox fmu,walbro 255,car runs great,idles fine,been driven it for two weeks now and haven't heard any nocking or any bad sounds from the motor.I'm reading between 14 and 15 on the gauge goin down the highway.About 13 to 14 with boost.but my idle is higher ,about mid 15.I'm not sure whats good for my set up?Any imput would help.

 

[rstare]

Only thing that sounds bad is 13-14:1 under boost, that's too lean. You want to be around 11.5:1. Although, there isn't really anyway to control fuel delivery with a 12:1 FMU.
Can't say expected it to be at 11.5:1, everyone always says it works, but the math just doesn't add up to the fuelp pump being able to flow enough at those pressures.

 

[starfish]

Is there any way I can richen the whole thing up?It kinda worries me with every thing on the lean side of the gauge.I had It idling for about 20 minutes(after I changed a alternater belt)and it was at 15.9-16.1 consistantly.Would 10:1 fmu work better?is there a way to modify the blox 12:1?

 

[rstare]

Idling slightly lean of stoich is normal.
Unfortunately, there is no way to alter your fuel injection with a 12:1 FMU. Getting a 10:1 would provide even less fuel, so that wouldn't help, either.
Best way to get more fuel would be to upgrade to an SFMU and get bigger injectors.

 

[starfish]

even at 7psi I would need bigger injectors? Ive done exacly like every one said and i'm still runnin on the rich side .Is that normal?255 walbro hp,blox 12:1 FMU,ar50 t3/t4 turbo,external wastegate 7psi spring,intercooler,blox bypass valve for map sensor,aem wideband kit,HKS bov,Noligy Hotwires(not the well hated nockoffs).What could be making it run lean.Motor has 82,550,all stock.

 

[Talon64]

Check for boost leaks. For the hell of it pull one of your spark plugs and look at it. See if its white or black.

 

[VelocitàPaola]

255 walbro hp,blox 12:1 FMU ... What could be making it run lean.

Your cheap fuel system is making it run lean. First of all, are you sure you have a Walbro 255lph HP, and not just a Walbro 255lph? If so, then your engine is running lean because the 12:1 FMU is only providing an approximate amount of the required fuel. Engines don't require perfectly linear fuel curves, but that's what the FMU provides...

It would probably be best for you to just ignore your wideband for now. There's no reason to look at it since there's nothing you can change or adjust. If you actually have a Walbro 255lph HP and everything else has been installed properly, just don't worry about it... carry on.