afm/550s question

[JustinSane]

Hey guys, did a search didnt find what im specifically looking for.

I have MKIV 550s/rail and a 1UZFE AFM. I know that i can run them, need both or it runs lean, etc.

my question is whether i absolutely need to upgrade the fuel pump, and run a fuel controller, or can i get away with just using an adjustable fuel pressure regulator.

Im just trying to run it reliable, cheap and simple. I'll use a walbro if i have to (i do have one), but i wanted to run it in my SC400. trying to keep the supra only mildly modified running stock turbo with a little more than stock boost.

 

[OfnaRcR4]

You need a pump OR a way to control your fuel with a perfect tune. Pump is cheaper so i'd go that route, only 100 bucks or so anyway.

 

[SideWinderGX]

You don't need anything other than the AFM and the injectors. The whole point of this mod was to keep it bolt on and simple. Everything else on the car is fine the way it is.

 

[natedogr]

Will mkiv 550s and rail even work on a 7m?

 

[SideWinderGX]

Dang, looked over the MKIV rail bit. No idea about that.

 

[CajunKenny]

The lex/550 combo does not require an upgraded pump.

 

[JustinSane]

Yeah I wasn't sure if the mkiv rail will work, figured I would try it, if it doesn't fit, I was just going to use the injectors.

I do have a walboro 255 pump, aeromotive reg, r154, 1jzgte that I was going to put in the supra, but I bought an sc400, so I wanted to run them in that car.

So I figured I would run the Lexus afm, 550s in the supra, leave the auto tranny in it, bring up the boost slightly (basically just shy of fuel cut, and call it a day.

 

[natedogr]

Pretty sure 2jz injectors are side feed. So they definitely won't work in a 7m rail. Sounds like either way you can't use either the rail or injectors.

 

[JustinSane]

Well lol it appears you are correct. I just assumed they would fit since I have the mkiv injectors on my 3sgtes and my 1jzgte. What 550s do people usually use on the 7mgte?

 

[natedogr]

Usually rc, pte, or certain model rx7 injectors. I want to say the 87-88 turbo II rx7's injectors were 550s. Don't quote me on that though. I'm actually going to be buying some 550s in the next couple weeks from a member on supraforums. He has a patented process of resizing injectors to whatever size you want. He does tons of testing on them and has had great results. He's already got a good number of sets done for other members. And his prices beat name brand companies.

 

[OfnaRcR4]

Evo 8 and I believe 9 injectors work. 560 cc