the holley commander 950 has 4 injector pins:

D13: Injector A
D14: Injector B
D15: Injector C
D16: Injector D

with the holley tpi harness, each pin drives two injectors, but the factory TPI harness only has 2 injector pins that drive 4 injectors each (left and right banks).

I'm wondering if anyone knows if/which wires can be spliced together off of the HC950 ecu to adapt to the TPI harness.

The rest of the adapter was pretty staight forward and I'm finished assembly all except for the injectors.

my question in short:
HC 950 pin-------->TPI harness
D13: Injector A--->(left or right bank?)
D14: Injector B--->(left or right bank?)
D15: Injector C--->(left or right bank?)
D16: Injector D--->(left or right bank?)

 

I called holley tech service and they said the 950 ecu fires the injectors in batch fire, meaning all 8 at the same time. So I wired A&B to one bank and C&D to the other.

I also found out the wiring for the serial connector to the laptop:

HC950_______DB9
A2(BRN)____not used
A3(GRN)____not used
A8(YEL)____DB9 pin 3
A9(ORG)____DB9 pin 2
A12(BLK/WHT)____DB9 pin 5

 

If you do not get your answer here, try this forum: Chevytalk.org EFI Forum

Doug_F = Moderator = Holley Engineer

Plus, many knowledgeable members as it pertains to the C950.

Good Luck, Ed