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Thread: C950 upgrade confusion, 550-604 or 554-113?

  1. #1

    Default C950 upgrade confusion, 550-604 or 554-113?

    I have an '85 Mustang GT that has been fitted with a Commander 950 prior to my purchase. Tuning the 950 is a complete nightmare. Considering ditching it all and going back to carb setup. Another consideration was upgrading to HP, but I'm not clear on what's required to do so, 550-604 or 554-113. Thanks.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    26,720

    Default

    The Holley 554-113 is just the HP ECU. You need the Holley 550-604 HP EFI ECU & Harness Kit.
    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.

  3. #3

    Default

    Would I be doing myself a disservice if I pulled all the C950 stuff and went with a Sniper instead?

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    26,720

    Default

    Is your current C950 EFI system TBI or MPFI?
    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.

  5. #5

    Default

    It's TBI...

  6. #6

    Default

    I'd think the modern Sniper or Terminator TBI setups would be much better over all than the old low pressure TBI stuff.

  7. #7
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    26,720

    Default

    I prefer the Terminator EFI: https://forums.holley.com/showthread...762#post208762 (Related Forum Post)

  8. #8

    Default

    I'm buying a used HP harness and ECU. I think it has V3 in it currently. Can I jump straight to V6?

  9. #9
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    26,720

    Default

    Yes, you can update straight to V5 or V6.
    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.

  10. #10

    Default

    If I ditch my Commander 950 system, can I use my crank trigger with the Terminator system? Looking at the online instructions there is no mention of a crank trigger.

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