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Thread: CFI to EFI

  1. #1

    Default CFI to EFI

    1984 5.o GT convertible w/AOD - mechanic says that CFI will soon die and no parts for it. Is there a plug in EFI that does not require a complete rewire of the car ?

  2. #2

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    I went to Holley efi (Term X MPFI) or you could try one of their sniper carb style systems.

    https://www.holley.com/products/fuel.../parts/550-849

    The 550-849 is basically a 2bl carb which should bolt straight onto the cfi intake. Will probably need to modify a few things and possibly add a regulator for fuel pressure.


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  3. #3
    FEP Super Member xctasy's Avatar
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    Convert to an eight injector port EFi using a 4bbl Weiand Stealth intake.

    The wiring changes for Port EFi are oxygen sensor and transmission interlock related.

    The management system to use is the Pimpxs or Megasquirt PlugnPlay.

    See
    http://vb.foureyedpride.com/showthre...53#post1918653


    There idea should be to keep the 4bbl Carb GT style air cleaner, but keep the CFI or Port EFi style TFi ignition.

    The way to do that is use a 4bbl Fuel Tech throttle body, and run mass air off just the drivers side intake snorkle. The guys at StangNet have a team of MeqaSquirt savants who have long since broken into the MAF transform program.

    Your battery stays were it is. You modify just the O2 sensor and use the MAF conversion. The 4bbl air cleaner and 5.0 HO Fuel Injection air cleaner remains.

    Its basically what the guys from McGee did to the 351 Cleveland 4 bbl conversion in 1988 to an 82 Fairmont Ghia European Sports Pack.

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    FEP Super Member xctasy's Avatar
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    Stock CFi systems and Port EFi are very similar.

    Holley does a Speed Density 550-501 Refit kit, but it requires you to use other Holley stuff with a full rewire









    See Broomys Garage


    https://youtu.be/SoxsHoQvMUc


    He just uses an old Chinese plastic 4bbl throttle body and its eight non port EFI injectors

    http://vb.foureyedpride.com/showthre...ines-on-84-cfi


    The MAF, the speed density PCV needs to be changed to the 1986 system, which is just sealing off the two oil filler and one PCV; these get replaced with an adaptor like the Port EFi.

    Stock VECI remains with just the 1986 MAS air vacuum take off and the oil filler and PCV modification.

    The wiring and emissions gear stays.

    95 percent of all the electric and electronic parts Port EFi needs to function are already there and MS uses a stock 60 Pin EECiv connecter..

    The 39 to 42 parts of the wet gear that make a car CFi or Port EFI, you normally just have to change 20 items on the fuel delivery side to make a CFi car Port EFi

    Its pretty easy to add another eight injectors to a Weiand intake manifold and just use the stock 4-bbl or even 2 bbl throttle body with an external MAP sensor

    http://vb.foureyedpride.com/showthre...ptions-for-CFI
    Here is the AU$ 3 Grand unit for Square and Spreadbore V8'S



    Its Mass Air Flow. It was used on the "HO 2 GO" 1987 XF conversion of the 1982 XE Ford Fairmont Ghia ESP 5.8. A bespoke 260 hp car with pretty mild engine specification. Australian racer Kevin Bartlett did the EFi transplant from the stock 4-BBL 800 cfm Carter ThermoQuad all 1976 to 1985 F trucks and 76-82 sedans had as a 188, 200, 207 or 216 hp net option depending on chassis and destination state.

    I'm only saying this because the CFi is limited to an injector of about 52 pounds per hour for two holes. The 3.8 CFI, 37's from our last discussion.

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    Not sure where your mechanic gets his info. There are only a few parts to replace on CFI. Injectors would be the main concern. They can be rebuilt or replaced. There are places who even make custom injectors.so I don’t see a problem there. Stocking up on tps sensors, egr valves might be worthwhile for any old car.

    More likely, your mechanic does not know CFI or can’t be bothered.
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    FEP Super Member xctasy's Avatar
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    Quote Originally Posted by KevinK View Post
    Not sure where your mechanic gets his info. There are only a few parts to replace on CFI. Injectors would be the main concern. They can be rebuilt or replaced. There are places who even make custom injectors.so I don’t see a problem there. Stocking up on tps sensors, egr valves might be worthwhile for any old car.

    More likely, your mechanic does not know CFI or can’t be bothered.
    True that. Check with emerygt350 and fgross2006 and MattyJ

    The stock CFi HO 5.0 did, has done and always will. Kic|< A$$.

    Carrol Shelby started with the Conelec Throttle Body EFi in 1968 on the FE 428 500 KR.

    Ford then eventually perfected it by 1984 in two barrel form.

    Compared to GM's 4.3 v6, 5.0 or 5.7 liter TBi, the HO 5.0.....its an absolute power house of 16 years of development.

    The 129 to 150 hp Standard Performance 5.0 from 1980 to 1984, not half the engine. The 120 hp 232 CFi V6, not even a third of what the 165 and 180 hp 5.0 HO CFi is.

    All parts exist, because its an offshoot of the VV2700/VV7200 Variable Venturi and Feedback 2150E Motorcraft 2-bbl. The key VOTM and Throttle Valve and Electric Choke Pull Over and the wonderful lack of ISC make the 5.0 HO CFi easy as pie to fix an tune.

  7. #7

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    The parts that are hard to find "quality" replacements for are the sensors that feed the computer. The actual CFI is beyond simple. If you 'need' to move on, fitech and holley both have out of the box no wiring necessary tbi solutions. However you will need to address the tv rod on the transmission. That isn't expensive but it really is critical if you go aftermarket.
    1984.5 G.T.350 5.0 CFI AOD Convertible (TRX package, loaded)
    K&N filter in stock dual snorkel
    GT40 heads, Edelbrock 3721 intake, MSD 8456 Dist., MSD 8227 coil
    Comp cams XE254H, hypereutectic pistons
    Hooker Super Comp Shorty Equal Length Headers
    catted BBK H-pipe, full custom duals
    Maximum Motorsports caster/camber plates and strut tower brace, 3.73 rear.
    Ford Performance Springs, Firehawk A/S 225/55r16 on LMR TRX r390 wheels (street)
    Federal 595 rs-rr 245/40r17 and 255/40r17 on OE cobra r wheels (race)
    Everything else stock and fully functional.

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