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Thread: 4000 PPM input for MPH speed?

  1. #1

    Default 4000 PPM input for MPH speed?

    One hurdle after another with this project. I want to datalog speed (MPH) with my Holley. I have an output described as transmitting 4000 pulses per mile. How can I configure this input to display MPH on my datalogs? Thanks again.

  2. #2
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    If this is an electronically controlled transmission (Transmission ICF), then it's the "Speed" channel in the Data Monitor & Datalogger.
    The Data Monitor & Datalogger need to be edited (click "E" at the top of each) for the Data Screens/Log Views you want displayed.
    "Click, drag & drop" the custom channels over to the Data/Log View lists. Scroll it the right to select the Transmission channels.
    https://forums.holley.com/showthread...g-A-Custom-I-O (Related Forum Thread)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  3. #3

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    It's not a transmission, it's a signal my factory PCM puts out dedicated to the speedometer. Instead of a custom input for this wire, should I run it to the transmission harness pigtail? Looks like it would be B18 on the P4 connector?

  4. #4
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    Quote Originally Posted by TraviZ28 View Post
    It's not a transmission, it's a signal my factory PCM puts out dedicated to the speedometer. Instead of a custom input for this wire, should I run it to the transmission harness pigtail?
    I wouldn't know about the OEM PCM, but this is how it's done with Holley EFI: http://forums.holley.com/showthread....0291#post30291 (Speedometer Output Info - Dominator ECU/Transmission ICF)

    Looks like it would be B18 on the P4 connector?
    Yes, the Transmission ICF receives the VR Magnetic/IPU VSS signal on pin B18 of the J4 ECU connector: http://documents.holley.com/techlibr...10555rev17.pdf (Holley EFI Wiring Manual - Figure 28, Page 41)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  5. #5

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    Yeah, I don't need a speedometer output. My car reads the gear ratios and feeds to my factory PCM, which translates it to a pulsed 4000 signal to my factory speedometer. Everything works fine there. I just want to input that speed to my Holley ECU for datalogging purposes. Is there any way to input that 4000 pulse signal into one of the 4 Input channels? If not, then I need to purchase the transmission P4 connector just for one wire since I'm running a 6 speed manual?

  6. #6
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    Quote Originally Posted by TraviZ28 View Post
    Is there any way to input that 4000 pulse signal into one of the 4 Input channels?
    The Inputs don't accept a pulses per mile signal, but it can be converted to Frequency in Hertz.

    If not, then I need to purchase the transmission P4 connector just for one wire since I'm running a 6 speed manual?
    You don't have to purchase the entire P4 transmission harness, just the ECU connector:
    http://forums.holley.com/showthread....als-Holley-EFI (Holley EFI ECU Connectors & Terminals)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  7. #7

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    Thank you, I'll grab that connector and post back. Offhand, if I can figure out the Frequency, how would I properly setup that Input?

  8. #8
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    Frequency is one of the Settings Type when selecting "Digital Speed/Frequency" or "IPU Speed/Frequency" Input Type.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 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 tires.

  9. #9

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    You could rewire it so that the VSS is wired directly to the Holley ECU on the standard J4 input, then program it to output 4,000 PPM from the speedo output, and wire that directly to your stock speedo. You'd then have to ensure your rear Gear Ratio & Tire Diameter size is properly programmed too in the Holley. That's essentially the same as running the Holley with an auto, but not using it to shift. You'd have to add the Transmission ICF to your tune. The only issue would be if your stock PCM is controlling ABS or cruise control. For cruise, you can splice the speedo output from Holley. Both my stock speedo and cruise needed 4,000 PPM, so that worked for me. The ABS controllers I've worked with need 128,000 PPM, so you can't have both, but yours may be different. Alternately, you could just install a driveshaft sensor, leaving the factory wiring alone.

  10. #10

    Default

    Thanks for the input ninety3, but like you said, I'm still using the stock PCM because I'm using ABS, Traction Control & Cruise Control. However, I've figured out how to make my 4000 pulses per mile input work to display MPH just fine. It was actually some simple math to figure out the Frequency, as Danny mentioned in post #6. For anyone in the future wanting to do a pulsed input for MPH display, this is the equation:
    Pulse X MPH ÷ 3600 = Frequency @ the MPH you just typed in.
    Example: 4000 x 9 MPH = 36,000 ÷ 3600 = 10 Hertz @ 9 MPH

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