Results 1 to 9 of 9

Thread: Replaced a Commander 950 ECU with Holley HP.

  1. #1

    Default Replaced a Commander 950 ECU with Holley HP.

    Hey. I had an older Holley Commander 950. I replaced the ECU with a Holley HP unit part number 550-604. I’m using the Commander 950 TBI on a built 351 Windsor. My question is about repinning the injector harness so I can use the 5-pin TBI connector. What injector leads from the new harness should I use and were? Thanks.

  2. #2
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,744

    Default

    Look here.
    Attached Files Attached Files

  3. #3

    Default

    Thanks for the quick response!
    I have that manual downloaded, my question is, the new harness has 16 wires that have to go into a 5-pin connector to connect to the for the four injectors on the throttle body injection, now I understand eight of the wires are for the MPI injectors. I was told that the TBI harness for the HP ECU is no longer offered, but the harness that Holley sold me can be repinned for a Commander 950 TBI system. Which of the eight wires from that harness do I connect to the 5-pin connector of the TBI is where I’m scratching my head? Thanks again.

  4. #4
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    1,744

    Default

    If I remember correctly, a TBI uses injectors A, B, C & D on the injector harness. A long time ago I used that kit to control a TBI throttle body. https://forums.holley.com/showthread...HP-ECU-Upgrade

  5. #5

    Default

    Thank you again for your help.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,499

    Default

    This information is on the forum, if you do a search.
    https://forums.holley.com/showthread...5027#post55027 (Commander 950 TBI Fuel Injector Wiring)
    https://forums.holley.com/showthread...=2495#post2495 (Commander 950 MPFI Fuel Injector Wiring)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

  7. #7

    Default

    You can also download the manual from Holley EFI software pages. The C950 instruction manual has electrical schematics for various setups in the last several pages.

  8. #8

    Default

    Quote Originally Posted by bchaulk View Post
    Thank you again for your help.
    Look at the wiring diagram for 550-423:
    https://documents.holley.com/199r10773.pdf. This is an LSx system, but for your purposes you'll see how the TB bulkhead is wired. Andrew
    IG @projectgattago
    I offer remote Holley EFI tuning.
    I deliver what EFI promises.
    Please get in touch if I can be of service.

  9. #9
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,499

    Default

    Everything he needs to know is in the links in post #6 above.
    See figure 135, page 52: https://documents.holley.com/199r10772.pdf (Holley Terminator EFI 4BBL TBI With Transmission Control)
    Open a Holley EFI 4BBL TBI base calibration, and look in the Pin Map, the "View Injectors" tab: http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual & Diagrams)
    EDIT: I fixed wrong link.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 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 M/T Street Comp tires.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us