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Thread: Holley EFI stand-alone dash AFR sensor.

  1. #1

    Default Holley EFI stand-alone dash AFR sensor.

    Hi all. Adding a nitrous kit to my car, and was wondering what's the best way to add a air/fuel ratio sensor to a stand-alone dash? On top of that, what sensor should I use to measure the nitrous gas pressure? Any help would be great. Been loving the dash so far.

  2. #2
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    Quote Originally Posted by No_rush440 View Post
    On top of that, what sensor should I use to measure the nitrous gas pressure?
    The Holley 554-104 1600 psi transducer.

  3. #3

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    Thanks for the reply Danny, I'll buy one of them. Guessing you don't know much about getting a air/fuel sensor working on the screen? Might have to use a separate kit.

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    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. #5

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    Thanks mate, really appreciate it.
    The AFR sensor in the post is discontinued, but I'm sure the Racepak one will work in its place. Thanks again.

  6. #6
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    You're welcome.
    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.

  7. #7

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    I bought that 554-104 pressure transducer. And I've wired it up to IO5. I think I calibrated it right. I went into IO5 settings put 1600 on the 5V and clicked linearize. But on the dash it's 157 psi at atmosphere. Did I do it right or is there another way to calibrate it? Any help would be great.

  8. #8
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    Quote Originally Posted by No_rush440 View Post
    I went into IO5 settings put 1600 on the 5V and clicked linearize. But on the dash it's 157 psi at atmosphere.
    The instructions state, "Each sensor has a linear voltage output range of .5 - 4.5 volts in the ranges listed above." So ensure your programming begins at .5 volts, not 0 volts.
    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. #9

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    Quote Originally Posted by Danny Cabral View Post
    Each sensor has a linear voltage output range of 0.5 - 4.5 volts...
    Just to expand on Danny's comment, the reason they do this is so the ECU has some degree of self-diagnostics on the sensor. If the pin returns 0 volts then there must be an open circuit in the wiring or sensor. If the pin returns the full 5 volts then there must be short circuit.
    Andrew

  10. #10

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    Thanks so much guys. I'll go over my other sensors and make sure I've done them correctly. Really appreciate the help.

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