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

[makemeknowit]

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.

[Danny Cabral]

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

[makemeknowit]

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

[Danny Cabral]

Is your current C950 EFI system TBI or MPFI?

[makemeknowit]

It's TBI...

[Bill C]

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

[Danny Cabral]

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

[makemeknowit]

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

[Danny Cabral]

Yes, you can update straight to V5 or V6.

[SCP440]

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.

[Danny Cabral]

Yes, the Terminator EFI can use a crank trigger kit.

[SCP440]

The magnetic crank trigger? How is it connected? Is there a loom ready made to join it? What option would I tick?

[Danny Cabral]

You can run an MSD crank trigger kit with Holley's 554-118 Hall-Effect crank sensor.
Holley's 554-118 direct replacement Hall-Effect crank sensor (¾"-16 threaded sensor):
http://documents.holley.com/199r10633rev.pdf (Holley 554-118 Instructions)

Or you can run the Holley EFI 36-1 crank trigger kit (Hall-Effect sensor) for small block Fords:
https://www.holley.com/products/igni.../parts/556-115 (Holley EFI SBF 36-1 Crank Trigger Kit)
http://documents.holley.com/199r10923.pdf (Holley 556-115 36-1 Crank Trigger Kit Instructions)

The Hall-Effect crank & cam sensors are wired as shown in the Holley EFI Wiring Manual:
http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Figure 11/12, Page 20/21)
http://forums.holley.com/showthread....m-Sensor-Setup (Crank & Cam Sensor Setup)
http://forums.holley.com/showthread....ing-Holley-EFI (Ignition Timing Synchronization)

[SCP440]

Thanks, that sounds good. What option would I need to tick with this crank trigger?

[Danny Cabral]

Custom Ignition Parameters for MSD Flying Magnet 4x crank trigger & Holley 554-118 Crank Sensor:
Ignition Type ............. ― "Custom"
Crank Sensor Type ..... ― "1 Pulse/Fire" (← Holley 554-118 crank sensor LINK.)
Sensor Type .............. ― "Digital Falling" (← Hall-Effect sensor.)
Inductive Delay .......... ― "adjusted per application" (← Synchronization info.)
Ignition Reference Angle ― "50° or 60°" (← Crank sensor setup LINK.)
Cam Sensor Type ........ ― "Single Pulse" (← If sequentially injected or CNP ignition.)
Sensor Type .............. ― "Digital Falling" (← Cam sensor setup LINK.)
Output Setup Type ..... ― "Points Output" (← Loose white wire CDI box trigger.)
Dwell Time ................ ― "2.0 msec" (← Do not set this to 1.5 msec!)