I'm a noob when it comes to tuning the 4g63, so I thought i'd ask before i blew up my newly rebuilt engine. Ok I know the stock fuel system can handle about 14-15 psi, but with an upgraded fuel pump, and fuel pump rewire how much boost can the stock injectors handle? While I'm at it what size are the stock injectors? Thanks, Shawn D.

450's are stock.

You can run 18 psi on the stockers as well with the 255 fuel pump and rewire (with a stock 14b that is)

18psi like Hybrid said, but you will need an SAFC to bump up the fuel a bit.

what theyre really tryin to say is... buy some 550s.

Ok, how far will a 255 fuel pump and rewire, with an safc take me? By that I mean i'll be able to run 18 psi safely won't I? Thanks, and sorry for the noobness. Oh, and let me know what you think of the first mods i want. I WANT to go with a full 3" turbo back exhaust with no cat(I live in missouri no emissions testing:cheers), an SAFC, 255 Fuel pump(what brand is reccomended), a MBC. And i'm hoping i can do this all for under $1100, so what do you think, and what order should i get everything? Thanks guys, that's what I like about this place you're willing to help without flaming, most of the time.

Originally posted by sd240
Ok, how far will a 255 fuel pump and rewire, with an safc take me? By that I mean i'll be able to run 18 psi safely won't I? Thanks, and sorry for the noobness. Oh, and let me know what you think of the first mods i want. I WANT to go with a full 3" turbo back exhaust with no cat(I live in missouri no emissions testing:cheers), an SAFC, 255 Fuel pump(what brand is reccomended), a MBC. And i'm hoping i can do this all for under $1100, so what do you think, and what order should i get everything? Thanks guys, that's what I like about this place you're willing to help without flaming, most of the time.

Aftermarket boost gauge should be the first thing you buy without question.

Stock injectors will become grossly too small with an AFC, Walbro 255 and rewire. You'll run out of fuel ability around 18-19 PSI then you'll have to upgrade injectors.

Get a 3" turbo back and port the shit out of your stock turbo to prevent boost creep.

Yea sorry I forgot to add, I already have an autometer boost gauge, and egt gauge.