Re: need bin info
50s can be tricky to tune for, but even if Daryl's bin isn't close enough for you, you can start with the stock bin and lower the BPC until you get good AFRs at idle. Give it some pedal and observe the rest of the fuel curve. If it seems close, do a test drive and tune VEs. If the rest of the curve is rich, continue to lower BPC and alter idle VEs....if too lean, raise BPC and alter idle VEs. Really applies for any injector or fuel altering mod.
When tuning Delphi 50s, I prefer to raise BPC a little and lower VEs across the board. This will give you some VE headroom where needed. They seem to be quite pressure picky, and as a result, you'll notice that when you start to get into boost (or about 42-47 fuel psi dependent on base), they require a little more VE to cover them until you get more pressure on them (about 48-50 psi and up they seem to establish a good flow rate). It's a weird thing and not entirely an F77X issue, but the 4-5 sets of 50s I've tuned all show the same characteristics.
