I have a 92 F150 build I'm doing. I have a roller 351 from a 95 F250 I plan on rebuilding with better internals. I also have an Edelbrock upper and lower intake. My question is can I keep it speed density and turbo it or will I need to get either a MAF conversation kit or an aftermarket EFI system? Ideally I want to keep it MAF and use bigger injectors. I'm not too familiar with this stuff so I need some help.

 

I think you will want an aftermarket EFI system ideally. The OEM MAF system has no provision for boosted operation everything necessary to manage it has to be added and dialed in manually, I have seen it done on an old 5.0 Mustang but it was a real DIY project with that old technology as there was nothing available at the time. It did work well but it certainly wasn't set and forget... you really had to pay attention every time you drove it.

 

Do you know anything about the PiMPxs system? Is that something I should get or go with something like a Sniper or Fitech EFI

 

What trans do you have?

Do you want something that you can plug into your stock harness, comes with a base tune for your setup, and has a dedicated support team that specializes in 80's/90's Fords?

 

Its a manual transmission. Which from reading about your systems, is ideal

 

For the PiMPx or PiMPxs yes, manual trans or manual valvebody auto is what you'd need. PiMPxshift for stock type auto trans but that doesn't apply to you.

Your application is batch fire in stock form which would mean you'd use the PiMPx unless you decided to modify the injector portion of the harness for sequential injection and use the PiMPxs.

 

I have a Pimp X in both of my OBS Fords and my brother has one in his as well. I built the motors and tuned the ECUs in all of them. I think the PimpX is good. The mostly "plug and play" ability is nice. The tuner studio software is decent, but the learning curve is steep. It felt like an eternity of messing around with the idle on my first tune just to keep it steady. After a lot of just messing around with the program on the first truck, the 2nd and 3rd trucks weren't a big deal at all. Had them running and idling in a few minutes after initial start up. The "auto-tune" feature is nice as well, as you just drive around under varying conditions and it will self-adjust but you will have to go back in and fine tune it still.

I would say that if you have a lot of time to spend messing around with the tune and are willing to put in a bunch of time to tune it yourself and learn the program, it's worth the money. But if you aren't confident that you can do it, you're going to have to pay someone else to tune it and that can be fairly pricey, especially if you decide to change something up and have to make more adjustments later.

You should also consider the costs of using an aftermarket ECU for the port injection vs throttle body fuel injection. Using the port injection you need injectors, intake, ECU, throttle body. ($400+800*+900+300=$2400) *I do see that you already have an intake. Using TBI you need an intake, and some kind of self learning TBI kit (TBI+ECU+Injectors all in one kit). ($400+1200=1600**) **Using prices of higher end parts like to keep it fair. Accounting for the $800 intake you already own, you'd spend the same to go either route at this point, but going to the TBI route you could sell your port injection intake and recoup some of your money.

You'll have to decide what's best for your situation. I like my PimpX units, but it is very likely that the next thing I put together will use throttle body injection EFI.

 

Is the OEM vacuum line system still needed with this system?

 

If you mean will there still be vacuum hoses then the answer is yes. Items like fuel pressure regulator, cruise control, dash heat/ac controls, etc. all use vacuum to operate. You can't get rid of that with any system.

With that said, some items that go away like EGR, has a vacuum line that will no longer be needed.