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Thread: How split crank/cam sensors, piggy backing LS.

  1. #11

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    Quote Originally Posted by TraviZ28 View Post
    I did this exact thing on my '02 C5Z. First with my HP EFI and now with my Terminator X Max for full DBW control as well. The cam & crank signal wires can be split to both the factory PCM and the Holley ECU just fine.
    Can you explain how you split them? Thanks.

  2. #12

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    Good question Danny. From my understanding, it's technically a magnetic pickup, but it works like a Hall-Effect. I can't explain it beyond that, but in my research at the time I tackled this conversion on my C5 that's the answer I got. People argue it is or isn't a Hall-Effect, but the end result is I was able to split the signal to both the factory PCM and my Holley and they both received signal just fine. Here's a recent post you can see people disputing whether it's Hall-Effect or not: https://ls1tech.com/forums/advanced-...voltage-3.html

    Cut the signal wire and soldered a Y to split each wire to each PCM/ECU.

  3. #13
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    Is it a 3-wire sensor, and does it transmit a square wave output?

    Hall-Effect: 3-wire, square wave signal (digital), pulse generation
    VR Magnetic: 2-wire, sine wave signal (inductive), voltage generation
    http://www.electronicproducts.com/El...g_for_you.aspx (Hall-Effect vs VR Magnetic)
    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.

  4. #14

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    They're 3-wire and I don't know how to verify the signal, assuming square wave since the split worked. However, all GM literature refuses to call it Hall-Effect.

  5. #15
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    Thanks. I think the confusion is due to Hall-Effect sensors having an internal magnet, hence they still function with magnetism.
    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.

  6. #16

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    When looking at a System Log, the cam & crank signals certainly look like square waves, not sine waves. Each tooth on a trigger wheel results in an instant voltage output, and once the tooth is passed the voltage goes to zero. I don't know if that makes it a Hall-Effect sensor, but to my thinking it certainly acts like one. Andrew
    IG @projectgattago

  7. #17
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    The Holley System Log only displays square wave patterns. In post #13, I was referring to an oscilloscope pattern.
    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.

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