Grounding Mod
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This is a discussion on Grounding Mod within the Engine Performance forums, part of the Tutorials & DIY category; Been reading posts about creating new grounds from the Neg batt. terminal to certain spots in the engine compartment. This ...

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    Grounding Mod

    Been reading posts about creating new grounds from the Neg batt. terminal to certain spots in the engine compartment. This is supposedly supposed to reduce hesitation and increase smoothness of the engine. If I really haven't noticed any hesitation from the engine, is it still worth doing to improve the ECU's ability to monitor what the car is doing?
    '00 2.5RS

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    From what I've heard from others, the mod is only really worthwhile if you have a piggyback chip like the Unichip. I have a TurboXS Stage 1 and my engine response improved considerably. It used to have a big flat spot right after the turbo kicked in in second gear. It's gone now.

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    HKS GROUND SYSTEM

    Im thinking about getting the HKS Earth Ground System, expensive but worth it. Anyone have or heard of it?
    La Fee Verte
    Subaru 2002 Impreza WRX Sedan

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    Yep, my hesitation is all but gone after iv30's grounding mod handiwork. I have it on video, but I still need to capture it on my computer. All it takes is 8 ring terminals and about 20 feet of 8-gauge speaker wire. I spent more than I had to by getting rather expensive ring terminals...you can just get regular cheap ones at a hardware store. I got the speaker wire from a car audio store. It really shouldn't cost you very much at all.
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    Re: HKS GROUND SYSTEM

    Originally posted by Nexus6
    Im thinking about getting the HKS Earth Ground System, expensive but worth it. Anyone have or heard of it?
    I'm with Verdugo, you don't need to buy a kit. Just go buy some good wire and ring terminals. That's all you'll need. No point is getting fancy with this type of "mod" (unless you want colored wires).
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    can someone explain the actual physics/ scientific reasoning behind the grounding mod? i still dont get what it actualy does to help
    Silver 911
    WRX's older brother

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    Basically When the ecu is taking a measurement from a sensor the value of that measurement can be altered if the ground potential at the sensor is different than the ground potential at the ECU.


    on another note:

    anyone out there w/ a new WRX notice that there arer lots of ground wires that look like they were added. I just notice lots of grounds that seem to be add ons (lots of electrical tape round the ends)

    nick
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    Registered User neptune's Avatar
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    I know there was a thread on this subject before, but I just did the grounding mod yesturday and I noticed that my boost readings have increases from the regular .09mpa to .10mpa. Now I know there was discussion on if this is the result of more boost or just more accurate readings due to a well gounded system. I've also install the 3/16 connector mod. With these two mods that car seems to be running better and is a little more peppy. Any thoughts?

    Thanks
    WR Blue Perl WRX

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    Registered User WRXed's Avatar
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    Originally posted by Penguinking
    can someone explain the actual physics/ scientific reasoning behind the grounding mod? i still dont get what it actualy does to help
    Computers can be easily confused when it comes to differences in "ground". Since the signals are usually based off of a "zero" point (not necessary literally zero), it is possible for the computer to get confused if the zero point is moving around. This would be caused by the ground drifting, which can be avoided by putting multiple grounds down to create a single large one. OK, I know that somewhat oversimplified, but I think you'll get the idea.
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    Moderator Penguinking's Avatar
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    Originally posted by WRXed


    Computers can be easily confused when it comes to differences in "ground". Since the signals are usually based off of a "zero" point (not necessary literally zero), it is possible for the computer to get confused if the zero point is moving around. This would be caused by the ground drifting, which can be avoided by putting multiple grounds down to create a single large one. OK, I know that somewhat oversimplified, but I think you'll get the idea.
    i'm starting to understand it

    all the sh*t from physics class is comming back to haunt me, i'm starting to recall all that stuff!!!
    Silver 911
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    just to play devil's advocate for a moment....if this mod is really so cheap and effective why would subaru not do this at the factory? i personally believe it's all a crock of sh*t but i do have some extra 8 gauge and ring terminals left over from my sub amp install...so what the hell.....kinda like being agnostic and going to church as an insurance policy!
    Mark
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    Originally posted by mark5211
    just to play devil's advocate for a moment....if this mod is really so cheap and effective why would subaru not do this at the factory? i personally believe it's all a crock of sh*t but i do have some extra 8 gauge and ring terminals left over from my sub amp install...so what the hell.....kinda like being agnostic and going to church as an insurance policy!
    I don't know for sure, but I only started noticing the hesitation after I got my unichip. From what I've read on I-Club, this mod only REALLY helps those of us that have unichips, since using only the factory ECU, you don't really notice it. I'd say that's why it's not already done at the factory
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    Moderator Penguinking's Avatar
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    Originally posted by mark5211
    .....kinda like being agnostic and going to church as an insurance policy!
    lol


    excellent analogy there mark
    Silver 911
    WRX's older brother

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    Originally posted by mark5211
    just to play devil's advocate for a moment....if this mod is really so cheap and effective why would subaru not do this at the factory? i personally believe it's all a crock of sh*t but i do have some extra 8 gauge and ring terminals left over from my sub amp install...so what the hell.....kinda like being agnostic and going to church as an insurance policy!
    Well if Subaru did it in the factory, that would be one less thing for us to tweak... Maybe it doesn't really work. Its like the old trick of installing a toggle switch not connected to anything.. when someone's in the car you flip and and say feel the difference? 9 outta 10 times they always say yes!

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    Where is this ground mod located

    instruction is located??
    Nothing happens until something moves

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