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Old 11-25-2012, 05:30 PM   #1 (permalink)
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Default Grounding Kit installed

I installed a grounding kit to my Forester and couldn't find much information on previous installs to a 2003 - 2005 XS so here are some pics and instructions.

It has made my car idle better, smoother acceleration, electrical stuff doesn't dim any more when you use the car windows etc. It has also made my sound system sound better, in a nut shell i thoroughly recommend doing this as the OEM grounding kit is pretty piss poor.

I believe the improvement to the engine running smoother is down to properly and directly grounding the throttle body and giving all the sensors ie MAP, IACV etc a really good connection rather than just going through the bolts to the manifold.

So here is the route i took:
Battery Negative -> Drivers side Intake Manifold

Drivers side Intake Manifold -> Alternator

Alternator -> Throttle body bolt

Throttle Body bolt -> Passenger side Intake Manifold

Passenger side Intake Manifold -> Chassis or strut nut.
All of the new ground wires were installed with dielectric grease and i made sure all the bolts connections etc was clean and shiny using a dremmel.

I had the wires custom made for me, i'm not very good at soldering so i left it to a professional.

Here's some pics:





Battery Connection:



Alternator Connection:


Throttle Body Connection:

Throttle Body Connection, close up:


Passenger side Intake Mannifold Connection:


Chassis Connection:


Last edited by Jarvace; 11-25-2012 at 05:36 PM.
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Old 11-25-2012, 06:06 PM   #2 (permalink)
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Nice write up! Was poking around the forum the other day looking for grounding solutions.
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Old 11-26-2012, 02:16 AM   #3 (permalink)
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It's quite amazing the difference it makes. I noticed improved idle and better automatic shifting performance mainly.
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Old 11-27-2012, 06:44 AM   #4 (permalink)
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I need to do this...
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Old 11-27-2012, 07:25 AM   #5 (permalink)
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What was your total cost?
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Old 11-27-2012, 12:09 PM   #6 (permalink)
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I also did this to my 2000 L. There was a very noticeable difference. It idled and ran much, much smoother. I made my own wiring setup from 10 or 12 gauge wire, connector eyes and hear shrink, and soldered it all together. Had less than 20 bux in it.
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Old 11-27-2012, 12:44 PM   #7 (permalink)
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That looks like a nice kit, but one thing I would recommend is to reduce the slack in the wires as much as possible. The shorter the individual pieces, the better.
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Old 11-27-2012, 12:56 PM   #8 (permalink)
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does anyone know where to get the high temp woven ribbon cable? iv seen several cars stock using this type of grounding and im thinking it might be a cleaner and less apt to fail from heat and will provide a pretty solid grounding path...yet probably susceptible to corrosion?..... but anyways....any thoughts?
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Old 11-27-2012, 01:04 PM   #9 (permalink)
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Quote:
Originally Posted by pleiad7 View Post
That looks like a nice kit, but one thing I would recommend is to reduce the slack in the wires as much as possible. The shorter the individual pieces, the better.
From an aesthetic or safety standpoint, I understand. Electrically, I'm puzzled. Electricity travels through wire at slightly less than the speed of light. I believe that the gauge, number of strands of wire in the cable, and quality of the connections would have a more significant effect than length.
Less is better when it comes to resistance in this case.

But you're right, neatness counts.
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Old 11-27-2012, 01:18 PM   #10 (permalink)
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Quote:
Originally Posted by Chilidawg View Post
From an aesthetic or safety standpoint, I understand. Electrically, I'm puzzled. Electricity travels through wire at slightly less than the speed of light. I believe that the gauge, number of strands of wire in the cable, and quality of the connections would have a more significant effect than length.
Less is better when it comes to resistance in this case.

But you're right, neatness counts.
From a physics standpoint, R = (pL)/A. Resistance equals resistivity times length divided by area. There is a direct relationship between length and resistance.
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Old 11-27-2012, 01:53 PM   #11 (permalink)
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Quote:
Originally Posted by Wessneroo View Post
From a physics standpoint, R = (pL)/A. Resistance equals resistivity times length divided by area. There is a direct relationship between length and resistance.
with all this being said if you go with something similar to what i was saying with the metal woven ribbon and kept the length short and tight. It would prob have phenomenal conductivity yet resistance would probably be a bit higher than a straight wire but more surface area and wider than a spun wire.... just throwing thoughts out there.....
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Old 11-27-2012, 05:01 PM   #12 (permalink)
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Cool How does the expression go?

How does the expression go? Too much of a good thing is sometimes too much! For sure, a properly grounded engine is a necessity. However, remember that some Subarus are waste spark ignition systems. A high voltage spark on one end of the engine should go to the other. Put a nice low resistance ground wire between and you might get a misfire.
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Old 11-27-2012, 05:06 PM   #13 (permalink)
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Wow, that sounds like a pretty big improvement, even stopping the lights dimming is a huge plus in my book. I will have to do this.
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Old 11-28-2012, 05:49 AM   #14 (permalink)
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Quote:
Originally Posted by Wessneroo View Post
From a physics standpoint, R = (pL)/A. Resistance equals resistivity times length divided by area. There is a direct relationship between length and resistance.
But is the difference in 1-2" of wire, worth even mentioning?

No...
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Old 11-28-2012, 06:54 AM   #15 (permalink)
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Anyone with the grounding kit notice a reduction in the greenish-white powder (corrosion?) buildup around the battery? I have to clean mine every month or two, which is kind of annoying because every other car I've ever owned never had that crap grow on the battery. The terminals are cleaned, greased, etc and I still get it.

I may put together a grounding kit this weekend. My lights dim when I run the power windows all of the time.
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