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Commander 950, no RPM signal.

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  • Commander 950, no RPM signal.

    I have a Holley Commander 950 and it works OK with an inductive crankshaft pickup unit, but does not work with my Pertronix coil distributor setup. I did change the hardware update window to reflect the type of RPM source I was using (coil), but no go. Is there some sort of resistor required to get the Commander 950 to see the coil voltage spikes as an RPM signal? Is the Holley Commander coil input function (circuit?) susceptible to damage if not grounded properly?

  • #2
    Is anyone out there still using the Commander 950? Mine was sitting in a drawer in the garage for 12 years, I could not get it to run back then. I finally put it back in a car yesterday and got it running by NOT using the coil wire, using the coil wire for RPM gave me 0 RPM in the control panel while cranking. No start. So I switched to an IPU, inductive crankshaft pickup, now the ECU works, I get an RPM reading at crank and it starts right up.

    But it's only one day so far on this IPU crank sensor system, we'll see how long it lasts. So is the coil RPM input to the Commander problematic? I measured it at 200 volts once.

    Has anyone had success using the coil input to the ECU successfully? I think the 200V coil spikes burned out that circuit in the ECU. I have two Commander ECUs and they both exhibit NO RPM with the coil now. What has anyone else noticed? IPU RPM input works, coil RPM input is a joke.


    • #3
      Hello Fellow Holley users. Do you still use the Commander 950? What do you use for an RPM signal? Did the coil input ever work on your 950? Thanks.


      • #4
        Originally posted by andy2175m4 View Post
        Do you still use the Commander 950?
        No, it's an antiquated EFI system.
        May God's grace bless you in the Lord Jesus Christ.
        '92 Ford Mustang GT: 385"/6.3L SBF, Dart SHP 8.2 block, forged steel crankshaft & H-beam rods, forged pistons, Trick Flow Twisted Wedge 11R 205 CNC Comp Ported heads, 12:1 compression ratio, 232°-244° duration/.623" lift/114° LSA camshaft, TFS R-Series FTI Comp Ported intake, BBK 80mm throttle body, Holley Dominator MPFI & DIS, Holley 36-1 crank trigger, MSD 1x cam sync, PA PMGR starter, PA 200A 3G alternator, Optima 34/78 Red battery, 100HP progressive dry direct-port NOS, R134a A/C, Spal Dual 12" HP 3168 CFM fans, Frostbite 3-core aluminum radiator, Pypes dual 2.5" exhaust, off-road X-pipe, shorty headers, Earl's -6AN fuel system plumbing, Walbro 255 LPH in-tank pump & Pro-M -6AN hanger, S&W subframe connectors, BMR upper & lower torque box reinforcements, LenTech Strip Terminator wide-ratio Ford AOD, 10" 3000 RPM C6 billet converter, B&M Hammer shifter, Stifflers transmission crossmember & driveshaft safety loop, 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.