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Thread: HP ECU Upgrade

  1. #1
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    Default HP ECU Upgrade

    I just purchased this:
    https://www.holley.com/products/fuel.../parts/550-604
    My goal is to end up with a Sequential MPFI on an 383 SBC.
    Right now I have a PJ3 TB injection system. The plan is to change the ECU now, use the PJ3 TB, injectors, IAC, TPS and change to a full sequential MPFI at a later date.
    I'm working on putting the A/C back in the car, so my toy budget for this year is getting maxed out.
    I looked at getting the TB injector wiring harness, but then I noticed it has the wrong connectors on it. My injectors have an EV1 connector. The same as what comes with the MPFI kit I got. Which I just picked up today, and it looks great. My plan was to run the software in TB mode. Then I checked the pin number that the injectors were using in this mode. It looks like it's using the injector plugs for Cylinders 1, 2, 3 & 4. I'm going to use these plugs and strap the other four out of the way. My question is how do I orientate the injector plugs? How does this system fire the injectors? Side to side, front to back or in an X pattern?
    Thanks in advance for your help.

  2. #2
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    Quote Originally Posted by 81 TransAm View Post
    It looks like it's using the injector plugs for Cylinders 1, 2, 3 & 4. I'm going to use these plugs and strap the other four out of the way.
    Open the Holley EFI software, enter the "Pin Map", and click on the "View Injectors" tab.
    This indicates the injector drivers (A-H), and which J1 Connector pin they're wired to.

    The injectors in Holley's TBI systems are wired like this:
    Pin B19 (J1 ECU connector) Injector Output Driver A
    Pin B26 (J1 ECU connector) Injector Output Driver B
    Pin B25 (J1 ECU connector) Injector Output Driver C
    Pin B13 (J1 ECU connector) Injector Output Driver D

    My question is how do I orientate the injector plugs? How does this system fire the injectors? Side to side, front to back or in an X pattern?
    The primary two injectors are A & B (1 & 2), and the secondary injectors are C & D (3 & 4).
    The Terminator TBI fires all four injectors simultaneously because it's a 1:1 throttle linkage.
    The older style TBI fires front to rear, because it's a progressive throttle linkage.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3
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    Thank you Danny for your prompt and precise answer. That is just what I was looking for.
    I have been doing a lot of reading on this site in the last month, and I see your name everywhere. It looks like you have helped a lot of people.
    When purchasing a product, it's good to know there is someone with a lot of knowledge supporting the forum.
    Are you employed by Holley, or are you just a car guy like the rest of us?

  4. #4
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    Quote Originally Posted by 81 TransAm View Post
    When purchasing a product, it's good to know there is someone with a lot of knowledge supporting the forum.
    Are you employed by Holley, or are you just a car guy like the rest of us?
    Thanks for the compliments. Holley & I have an "arrangement" for me managing the forum. I am also a gear head.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  5. #5
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    Judging by your level of knowledge they made a good decision.

  6. #6

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    I'll say, "a sideways thanks". Danny is one of the most helpful technical people I've run into on the internet.

  7. #7
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    With the injector harness wired the way it is, it's easiest to run plugs marked cylinder #1 & cylinder #3 to the front two injectors, and plugs marked cylinder #2 & cylinder #4 to the rear two injectors. If they all fire at the same time, this should work.

  8. #8
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    Quote Originally Posted by 81 TransAm View Post
    If they all fire at the same time, this should work.
    That's correct, but this requires a 1:1 throttle linkage to inject fuel properly. Progressive throttle linkages can usually be converted to 1:1.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  9. #9
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    Yes, I have it setup for 1:1.

  10. #10
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    Right now I use a MSD RPM switch to activate my shift light.
    Can I use the Secondary Fuel Pump output to activate the shift light? I don't see a problem doing this.

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