Used the search and cold not find an answer to my quetion so here it is...

Im using the tune from STS for the diablosport and the LTFT's are at max (20% or so.) Rick Squires Made a second tune alot richer for me and im still getting 17-20% for the LTFT. And my wideband AFR is at 15.0 - 15.3 sittingin the driveway.

Im thinking its not a tune problem but a mechanical problem...the fuel pressure? O2's.....help please.

 

What are your mods and do you have a log?

 

#42 injectors and walbro pump, sts kit...on internals.

Did a fuel pressure test today and its going to 24psi then bleeds to 0psi. then with motor running its steady at 24psi.

So im thinking bad pump...

 

two things:
1. if that is the original fuel pump, then yeah you need to upgrade to a walboro and get a new regulator
2. those ltft numbers your getting is that WOT or at part throttle(cruising)?