Simple ground mod made a huge difference

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NuwanD
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Simple ground mod made a huge difference

Post by NuwanD »

Hey guys, i did a grounding mod on my car last week and i just wanted to share that it makes a huge difference. The idle is much smoother and slight hesitations in the power band have dissappeared. Also low end torque seems to have benfitted.

The grounding consisted of 4 sections of 6 gauge wire with copper ring terminals. 3 from the negative battery terminal going to either the engine block, strut tower, and replacing the stock ground which attaches above the headlight. The last wire goes from the passenger side strut tower to the engine block.

Just wanted to let you guys know:)
Nuwan
1992 Open Class Legacy Turbo
2004 Forester XT
2000 Impreza 2.5RSC (Supercharged)
1990 Rover Mini 1000
JasonGrahn
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Post by JasonGrahn »

personally i don't believe that these do anything but band-aid or hide a negative condition that you car has. Bad grounds should be cleaned and fixed, not worked around.

None the less, my opinion doesn't matter; this topic has been covered already, as well as WHY you have seen the improvements (the WHY is the important part).

viewtopic.php?t=1520&highlight=grounding+mod
-Jason Grahn
ciper
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Post by ciper »

I suggest removing the stock grounds you find, sanding all surfaces (on the car, on the bolt face and on the terminal) and once you reattach them use some spray paint to seal it.
Legacy777
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Post by Legacy777 »

I've re-done all the stock ground points, however I do feel there is merit to the extra grounds. However I'm going to go about it in a more scientific mannor and try and find spots where continuity is not as good as it should be
Josh

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1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT

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NuwanD
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Post by NuwanD »

in doing the ground mod i replaced the old negative terminal which was aged, so that is a partial cause of the improvement
Nuwan
1992 Open Class Legacy Turbo
2004 Forester XT
2000 Impreza 2.5RSC (Supercharged)
1990 Rover Mini 1000
Dizzy
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Post by Dizzy »

I just did my grounding mod this afternoon and I'm quite surprised. I ordered it from a vendor on the STi forum (staticX313...I think).

It is made up of seven wires (4 guage). The hesitation I was having at various points in the RPM range is gone. The RPMs climb crisply and the car idles smoother. I have a vacuum/boost guage & I noticed that I'm pulling approx. 0.5 to 0.4 more inches Hg. at idle.

Needless to say, I would recommend it. Stuff that I did before doing the grounding mod:

Plugs (NGK)
wires(NGK)
Fuel pump (walbro)
fuel filter
K&N panel filter, ducting from fog light
PDM catless 2.5" downpipe & custom center section
2004 STi
1993 Touring Wagon
QuickDrive
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Post by QuickDrive »

Do you have the lengths of those 7 wires?

or can you scan in the instructions you got and email em to me?

I have a goos dealer for car stereo wires and could make one of these for cheaper than the vendors
R I P-------- 91 Turbo 4EAT --------R I P
DOA
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Post by DOA »

Just look around the engine bay for any convenient bolts that go directly into the block and measure back to the battery negative for your lengths. Didnt affect my cars running 1 little bit but that probably means the existing engine earths in good condition.
If only I hadnt bought the bike, this would feel fast :P
ciper
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Post by ciper »

Instead of randomly placing them get a good multimeter and measure to find where a ground would be needed. Someone did this in the Legacy forum on Nasioc a few years ago.

If I remember right only three additional wires where needed.
legacy92ej22t
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Post by legacy92ej22t »

I'm definitely going to add this to my to-do list for the spring.
-Matt

'92 SS 5mt. All go and no show. Sold :(
'94 Audi UrS4 Modded (new project)
'96 Outback 5mt.
'07 Legacy 2.5i SE

[quote="Redlined"]
Oh... and I hope the fucker get bunked with Gunter, arrested for raping Gorillas.[/quote]
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