i have a ls/vtec setup with a t3/t4 turbo. im running 7 psi. for some reason my car is running super rich and i cant figure it out. for fuel i bought a walbro 255lph pump and a cartech fmu(rising rate regulator). my **** is soo rich that when my car is warmed up my air/fuel meter is pegged all the way rich. only after i spool the turbo and let off the gas completely does it lean out. and only then it reads about optimal. the gauge is wired into my ecu so its not getting a faulty message. i need some help. i have adjusted the fmu all over the place but it only changed things after atmospheric. any help? thanks.

 

i think the air/ fuel is supposed to read that when your at idle
better rich then lean
just get your car tuned if your that worried and it will be fine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by imskatencrzy &raquo;</TD></TR><TR><TD CLASS="quote"> my **** is soo rich that when my car is warmed up my air/fuel meter is pegged all the way rich. only after i spool the turbo and let off the gas completely does it lean out. any help? thanks. </TD></TR></TABLE>

Are you using a 1v o2 sensor "light show gauge" to reach this conclusion? If so, take the gauge out and sell it to somone who knows less than you. Then do some reading on how a 1v narrow band o2 sensor works compared to a 5v wideband o2 sensor.

 

It's becuase of the FMU, it will run stupid rich because it's old *** technology that was great in it's day but there are much better options now.

Get a set of injectors and have your ECU chipped and tuned. It will kill the rich problem.

Second, you are using a light show guage off the stock o2 which it about as accurate and me sniffing your exhaust at WOT and guessing your a/f.