Johnny5

iTrader: (2)

I have some issues with my WOT A/F and I believe my VE table are off a bit.

Is is a waste of time to tune before the pump? I tried to search to see what tuning was necessary after a pump and didn't find anything.

Is there something you should tune after the pump? Will it alter your LTRMS?

Is it putting out more pressure or the ability to handle that pressure contantly?

slowpoke96z28

iTrader: (2)

if i had to choose, i'd tune after the fuel pump install.

MeentSS02

iTrader: (11)

Is the issue that your A/F is going too lean at WOT? I'm running the 28.5 lb injectors in my bolt-on SS, and know that it is already at 83% duty cycle, and I don't have a quarter of the mods you do.

Either way, the fuel pump should help, but I think you'll ultimately need larger injectors for your setup. I'm not sure tuning after the pump would help your problem (depending, of course, on what that problem is).

jimmyblue

iTrader: (11)

The whole point of the new pump is to deliver more flow@
working pressure. So your regulator is going to have to blow
off more gasoline back to the tank, and since it takes some
more pressure rise to open the regulator more, your head
pressure should rise some. The PCM doesn't know about it
unless you tell it. Ideally you would take some "before"
idle & WOT fuel pressure readings, and some "after", and
be able to tweak the IFR table with a sqrt(after/before)
multiple. But if you don't have that data then you'll have
to back into the fit.

SmaknaSS

iTrader: (1)

I would tune afterwards,since I put my new racetronics pump in my L trims went more negative.