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Username Post: Holley C950 MPFI upgrade to HP-ECU?        (Topic#352378)
Posts: 59
Age: 51
Loc: North Sweden
Reg: 06-28-05
08-07-18 12:00 PM - Post#2742216    

I have an old Commander 950 MPFI that I run on E85 but I really wish to upgrade the ECU to something more modern, and the HP-ECU looks exactly what I need...!
If I read about Holley HP it says "....or as a replacement for your C950 ECU", does that mean I can buy a HP ECU and a adaptercable so that I can just replace my old C950 ECU in a blink, or do I have to replace my C950 harness with a new harness?
Does anybody tried to do this with the same setup?

Former President of Nordic Corvette Club of Sweden
Info and som photos on my Corvette
Best ET 12.45s/173 km/h, 7.91s/140 km/h


Senior Member
Posts: 1603
Reg: 01-10-03
08-07-18 12:47 PM - Post#2742223    
    In response to Roffe

I did this upgrade years ago, also on a C3.

No, there's no adapter. You'll need to use the new harness supplied in the upgrade kit. Each injector is controlled individually on the HP. C950 ran them paired so 4 wires on the C950 becomes 8 on the HP.

Good thing is the throttle body, sensors, injectors etc all work with the HP. Also consider the Holley dual sync distributor. Easy and cost effective way to enable sequential injection.

The upgrade is worth it. The HP is a much superior system compared to the C950.

Markus 1971 Vette

"16th Year" Gold Supporting Member
Posts: 1965
Loc: Dallas, TX
Reg: 05-17-04
08-08-18 06:58 AM - Post#2742322    
    In response to zwede

X2. I very highly recommend the Holley Dual Sync distributor. it solved some problems I was having with the GM small cap TBI distributor I was using.

'57 210, 327 cid, Holley MPFI, 700R4, A/C & more.
'51 Studebaker Starlite coupe, 350, TH400, GV OD.
'96 Replica of a 1950's Teardrop Trailer.


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