Simple ground mod made a huge difference

NuwanD · Post by **NuwanD** » Thu Sep 11, 2003 7:16 pm

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:)

JasonGrahn · Post by **JasonGrahn** » Thu Sep 11, 2003 8:07 pm

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

ciper · Post by **ciper** » Thu Sep 11, 2003 8:34 pm

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.

Post by **Legacy777** » Fri Sep 12, 2003 1:26 am

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

NuwanD · Post by **NuwanD** » Fri Sep 12, 2003 5:10 pm

in doing the ground mod i replaced the old negative terminal which was aged, so that is a partial cause of the improvement

Dizzy · Post by **Dizzy** » Fri Feb 27, 2004 10:30 pm

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

QuickDrive · Post by **QuickDrive** » Sat Feb 28, 2004 2:32 am

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

DOA · Post by **DOA** » Sat Feb 28, 2004 10:17 pm

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.

ciper · Post by **ciper** » Sun Feb 29, 2004 4:55 am

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 · Post by **legacy92ej22t** » Sun Feb 29, 2004 10:13 pm

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

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Simple ground mod made a huge difference

Simple ground mod made a huge difference