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Thread: WBO2 Sensor Location

  1. #1

    Default WBO2 Sensor Location

    I currently have my WBO2 sensor located about 18 inches back from the turbo. But I'm wondering if this is too close. Should I move it farther away? I have the NGK WBO2 sensor that came with the Holley ECU. Thanks.

  2. #2
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    It's just fine there. I have mine up around 12" with no issues for a few years now. If you're worried, you can always add a HBX-1 Heat Bung Extender. Several companies online sell them.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

  3. #3
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    And make sure there's some exhaust piping after the WBO2 sensor too (not near an open pipe).
    http://forums.holley.com/showthread....ension-Harness (Read "Wideband O2 Sensor Notes")
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  4. #4

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    What about the location with an N/A engine with an X-pipe full exhaust; can the WBO2 sensor be installed in the cross section?

  5. #5
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    It should be installed before the x-pipe. The WBO2 sensor should measure the AFR from one bank of cylinders.
    It's not recommended to locate the WBO2 sensor in the x-pipe/crossover, because the two banks of an engine measure differently.
    So you could be exacerbating a potential AFR problem by trying to read both banks simultaneously. It should be in the leaner bank.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  6. #6

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    I read this on Facebook, what you think about it?

    Click image for larger version. 

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  7. #7
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    It's not recommended to locate the WBO2 sensor in the x-pipe/crossover, because the two banks of an engine measure differently.
    So you could be exacerbating a potential AFR problem by trying to read both banks simultaneously. It should be in the leaner bank.
    Users have claimed such issues on this forum. However, feel free to perform your own testing. It's your EFI system, and your engine.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  8. #8

    Default

    I have already installed a Bosch LSU4.9 (LC-2 Innovate) in the collector of the full length headers (3" after the primary tubes).
    My new engine has a cam with 38° overlap and many WBO2 readings are fluctuating around 13-18 at idle (carb).
    With the EFI kit, I will install the new WBO2 sensor on the driver side, but further away from the primary headers tubes to compensate the unburnt fuel mixture from the overlap.

  9. #9
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    Quote Originally Posted by Robs455 View Post
    I have already installed a Bosch LSU4.9 (LC-2 Innovate) in the collector of the full length headers (3" after the primary tubes).
    My new engine has a cam with 38° overlap and many WBO2 readings are fluctuating around 13-18 at idle (carb).
    That's because it is too close to the primaries tubes, and is getting individual pulses instead of a good signal.
    Move it back to a position 18" away from the primaries, and your issue should smooth out and mostly go away.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

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