What fuel pressures does everyone shoot for? I just dropped in my walbro 255 and I am way rich at idle... I know I need to take it back a bit, but how much? What pressures do you guys see WOT near the top of the rev range?

The motor is stockish with just a short ram style intake and a crappy exhaust system.

 

Stock is 58, many people see a drop to 55 at WOT. From what I've read people have reported 62psi at idle with some aftermarket units. I'm not sure with WOT, try a search.

And FWIW, people tune via the VE table ( last 8 months ) or the IFR table ( prior 4 years ) , not via the pressure ( rich at idle ).

 

Stock is 58, many people see a drop to 55 at WOT. From what I've read people have reported 62psi at idle with some aftermarket units. I'm not sure with WOT, try a search.

And FWIW, people tune via the VE table ( last 8 months ) or the IFR table ( prior 4 years ) , not via the pressure ( rich at idle ).

Did your old fule pump die? Did you upgrade injectors?

 

I haven't gotten a chance to play with the VE tables yet, but I will be doing that tomorrow after the nitrous install. I just know it needs to come down because I am seeing 72+psi under idle/light load and ~60psi under WOT. I'll try to pull it back to right around 60 psi.

Same injectors, old pump didn't die... but it is not in an fbody, it is in an turbo2 rx7. The turbo2 rx7 pump didn't appreciate trying to flow for an '02 ls1 ;-)