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Thread: Installing a VSS Sensor with Holley EFI

  1. #151

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    I’ve read through the thread and haven’t found exactly what I’m looking for. If I missed it, I do apologize. I’ve got a Viper T-56, using a three wire (Hall-Effect) sensor, with a Dominator ECU. I initially loaded the Transmission ICF, but recently removed it and setup a VSS in the I/O. I've wired the sensor with sensor ground to pin B14, sensor power to pin B20 and sensor signal to pin B18 all in the P4 connector. My hopes for now is just to have vehicle speed available to the ECU, however, in the future I may want to have the ECU send the information to a Cable-X or equivalent. I wasn’t able to discern if this will work as wired, or if I need to use the P2. Also, I’m a little unclear about Pulses To Average, PPROT & Gear Ratio. The best info I’ve found says the Viper has 10 pulses per rotation, so that's what I programmed, with the same to average. The differential gearing is a 3.91:1, which is the value I used. The last drive I made, the datalog shows a stagnant solid line, which suggests to me that I have a signal problem. Can someone show me the error of my ways please? Thank you!

  2. #152

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    If your wiring the Hall-Effect sensor to the J4 connector it won't work. Pin 18 is looking for a VR type signal, which is what the auto transmissions use. You can wire the Hall-Effect sensor to any pin that can be S type. You need to know how many teeth are on the T56 you're using. That's the PPROT revolution value. Andrew
    IG @projectgattago
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  3. #153

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    So far, I certainly agree that it’s not working. When I check the wiring diagram paperwork and when I assigned the pin in the I/O ICF, everything shows pin B18 (Input 39) as being an (F, S) input. Isn’t that both frequency and speed? I know in the setup of the I/O, I had to choose Digital Speed. If I’m reading the information incorrectly, then is there a suitable selection on the P4 connector? And if not, what parameters am I looking for on the other connectors? Thanks for the assistance!

  4. #154
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    http://forums.holley.com/showthread....0291#post30291 (Speedometer Output Info - Dominator ECU/Transmission ICF)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, 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.

  5. #155

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    Let me unpack this a little more. B20 on J4 is 5V sensor power. Is your Viper sensor 5V or 12V? And you're right, J4-B18 can be either both F & S, but that pin is only active when the Transmission ICF is loaded. The Transmission ICF is only setup for the various automatic transmissions and it does not allow you to change the pulse per revolution count. This requires some creative math to get the speedometer reading correctly.

    You have to decide if you want the Speedometer Output or not. If you do, then you need to use the Transmission ICF. If you do not, then I suggest using another S input. Andrew

  6. #156

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    Thanks for the clarification. The Viper sensor uses 5V. Eventually I would like to use the Speedometer Output, so I'm definitely interested in getting everything setup for that now. If I load the Transmission ICF, that then reserves pin B18 for the VSS of the GM automatic. To be clear, I’m not stuck on using that particular pin, I’m interested in making it work. However, if I load the Transmission ICF, then I’m unclear on how to proceed. The math portion I’ve seen referenced I didn’t associate as applying to me, as I don’t have speedometer gears to enter into the calculation. Danny, I appreciate the link, maybe I missed the part applicable to me. But again, I don’t have speedometer gears to base the calculations on. Thanks!

  7. #157

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    My apologies Danny. Over the course of reading the thread, I knew that link had been suggested (and read). I mistook the link for the VSS setup. I did go back and reread the link. I see where the software defaults to a VR setting. I did not however, see what to do with a Hall-Effect Input.

  8. #158
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    Originally Posted by Danny Cabral
    Are you trying to send a pulses per mile signal to a speedometer, or adding a vehicle speed sensor channel input?
    If operating an electronic speedometer, do so by using the "Speedometer Output Enable" in the Transmission ICF:
    http://forums.holley.com/showthread....0291#post30291 (Speedometer Output Info - Dominator ECU/Transmission ICF)
    If wiring a stand-alone VSS sensor (MPH display), do so with a custom speed Input in the Inputs/Outputs ICF:
    http://forums.holley.com/showthread....ith-Holley-EFI (Installing A VSS Sensor)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 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, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, 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.

  9. #159

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    At the present, I just want the input setup. Eventually, I may use the information to drive a Cable-X speedometer drive. My thought for now is that if the information is there, it could also be used for any other operations that need a speed reference. For example, this thread had someone looking to activate a reverse lockout solenoid. While that’s not necessarily my intention, I like the idea of having the option.

  10. #160

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    My VSS sensor is connected & working, and displays on the datalogger. Question: Can I get the 3.5" TSLCD handheld to display the speed?

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