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Thread: Capacitor in PLX Wideband

  1. #1
    Tuner wreckwriter's Avatar
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    Question Capacitor in PLX Wideband

    I've had my PLX wideband hooked up for quite a while and have always had trouble with it getting 'stuck'. The problem, and I knew this, is that the kit came with a Molex plug and some pins, required assembly. My hook up with the pins and wire was never good. Recently I decided to put the effort in to fix it once and for all.

    Research taught me that the square Molex connector used was the same as a Pentium 4 power connector. Got one of those and spliced it in, no more pin connection issues. Got the connector for 5 bucks on Amazon ( search Cables Unlimited ATX to P4 Power Adapter ).

    The kit also came with a capacitor to serve as a noise filter. I realize it can be used without the capacitor but since I'm working on this already I'd like to go ahead and put it in. My question is, how does it go?

    The instruction say put it as close to the 'device', in this case the MVPI, as possible. Can I do this safely in this way:

    Was thinking of simply soldering one leg of the cap to the end of each wire where it goes into the green wire block that attaches to the MVPI. Basically the end of the wire and the leg of the capacitor both go into the green block and get tightened down as normal. Will this work properly?

    Is there risk to having the capacitor connecting directly into the MVPI like this?

    Thanks guys!

    2008 Pontiac G8 GT, IHRA Modified, NHRA Pro ET

  2. #2
    Senior Tuner DSteck's Avatar
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    You need the cap connected to both the signal wire and ground, and if it's got an anode/cathode, it needs to be hooked up properly.

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  3. #3
    Tuner wreckwriter's Avatar
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    Quote Originally Posted by DSteck View Post
    You need the cap connected to both the signal wire and ground, and if it's got an anode/cathode, it needs to be hooked up properly.
    Correct, both tails of the cap would be done the same way. Believe it is non-polarized but will verify with magnifier before hooking it up. Will my basic idea of how to hook it up work correctly?

    2008 Pontiac G8 GT, IHRA Modified, NHRA Pro ET

  4. #4
    Tuner wreckwriter's Avatar
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    Verified, no polarity markings on cap.

    2008 Pontiac G8 GT, IHRA Modified, NHRA Pro ET

  5. #5
    Senior Tuner DSteck's Avatar
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    Just tighten it into the MPVI plug with the bare wires.

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  6. #6
    Tuner wreckwriter's Avatar
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    Quote Originally Posted by DSteck View Post
    Just tighten it into the MPVI plug with the bare wires.
    That's basically the plan, plus drop of solder to hold it together. Thanks much for your time!

    2008 Pontiac G8 GT, IHRA Modified, NHRA Pro ET

  7. #7
    Senior Tuner DSteck's Avatar
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    Just out of curiousity, what's the cap value they provided?

    DSX Tuning - Authorized HP Tuners Dealer
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  8. #8
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    0.1uF

    2008 Pontiac G8 GT, IHRA Modified, NHRA Pro ET