What contols A/F ratios at higher loads? When my engine goes from vacuum through 0 psi into boost, she goes *very* lean and will start to knock badly if I leave my foot in it. Its a fueling issue and I'm at the point where I don't know where else to look.

Thanks mates!

 

post up logs and your rom. that will help get your issue resolved

 

Original fuel pump?

 

lean spool

 

Thanks for the help. I can post up the rom, but it knocks too much to properly do any sort of pull... Anything more than about 20% throttle will make her lean out. Mods are GT3076r, gsc 1 cams, wally 255, 880cc injectors.

 

Nah, I wish.

 

Check the vacuum line on the fuel pressure regulator. Fuel pressure may not be increasing with boost like it should be.

 

take out some timing and richen it up if everything else is ok fpr lines etc

 

+1
definitely sounds like the vacuum line fell off.

 

Vacuum lines are good, fpr is new... Boost leak test ok...

 

Check your injectors and fuel pump grommet.

 

Is your fpr adjustable? did you adjust it?

 

No, its a new oem fpr

 

Does that mean that leanspool is enabled or disabled?
Maybe you should post a log along with your maps so we can get a better picture of what's going on.

 

what was changed before this issue occurred?