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Old 01-30-2004, 05:20 PM   #1
Spidey Rex
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Thumbs up Surprising grounding mod

I won a Sun Hyperground System at the So.Coast Subaru meet last week (thanks!) I never would have got one but it was free. I expected maybe a smoother idle and that's it. But I really feel a significant difference in my car. the idle is smoother, and the stereo, lights, a/c all appears to work better. What was surprising was that I do feel like there is more power available now. Not a lot, but the revs are smoother and there is more thrust at low and mid range revs. Maybe it doesn't give more top end, but there feels like more power accelerating! Most people don't find this to be true, but maybe it has to do with my Rex being and auto. Maybe the ECU is happier.

Any ways I recommend this mod, but you can easily do it yourself without a $120 kit.
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Old 02-02-2004, 02:00 PM   #2
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Did you disconnect the battery's ground cable while installing the kit? If so, you reset your ECU and that's what you're noticing.

You can use a pair of vise grips to gently keep the ground cable connected to the battery when you loosen the bolt to make the kit connection. That way, you can install the kit without resetting the ECU.

Craig
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Old 02-02-2004, 03:10 PM   #3
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How did you connect yours up? Did you do the following:

1) from battery to driver strut tower.
2) from battery to driver side chassis
3) from passenger side chassis to passenger side strut tower.

The weird part for me is that I didn't notice a difference anymore after I installed my front strut bar.. I think it's probably because I put the grounding mod on top of the strut bar instead of the bottom, because it couldn't fit on the bottom!
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Old 02-02-2004, 04:18 PM   #4
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Hello, I performed the grounding mod yesterday but only went from the battery ground to the engine and strut tower. I used nice 8 guage wire. I noticed the idle is much smoother and a couple hundred RPM higher, maybe a little more power, but just butt dyno probably. Overall pleased with this mod.
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Old 02-02-2004, 10:59 PM   #5
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You guys are shooting your own damn feet by using the strut top mounting points for grounding points.
Just about ANY other bolt that is connected to the chassis is a better grounding point. Think about the bolt you are attaching to and what it is attached to and by what and you will know why.
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Old 02-03-2004, 11:53 AM   #6
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Wow, really?? Thanks for the heads-up! It seems like everyone does it that way with the bolts from the strut tops. What setup would you recommend?
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Old 02-03-2004, 01:26 PM   #7
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Is a grounding mod fairly easy to do as a do-it-yourself project? 8-gauge wire is a given, what do you use to connect the wire to the bolt, clamp-on connectors that fit below the bolt head? Seems cheap. This is still on my to-do list though.
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Old 02-03-2004, 02:39 PM   #8
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Spool,
I used a good quality amp install kit with gold crimp connectors, cut the wire to length to where in the engine bay that you want to go and then secure them down. I used the strut tower bolt (which I will probably change in light of uncle scotty's post) and one run to the ground bolt on the right side of the intake manifold. both grounds are connected to the negative terminal on the battery. Easy mod to do, and good results form me.
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Old 02-03-2004, 02:42 PM   #9
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Uncle scotty,
Thanks for the info, I thought that the tower bolt might not be a great ground, but that's where most people were running to. I guess I'm the sheep.
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Old 02-03-2004, 07:45 PM   #10
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who makes a good grounding kit for the GC8 style impreza ? i see alot of "ground earth" on ebay...bad idea ?
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Old 02-03-2004, 08:20 PM   #11
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there is one cool guy that sells a 2.5 grounding kit on ebay, here is the link. http://cgi.ebay.com/ebaymotors/ws/eB...tem=2458371783
hes real cool to deal with
Shane
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Old 02-04-2004, 04:59 AM   #12
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I used bolts for the washer bottle attach, the boost solenoid cover attach bracket, the upper radiator support, and all the stock grounding points.
Everyone should check their ground strap from the trans to the pitchstop mount....mine was not connected from the factory....

HTH
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Old 02-04-2004, 12:43 PM   #13
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If the ECU learns your driving habits, wouldn't a reset make the car suck until it relearned? I did disconnect the batt., but after some roughness for 30sec, it seemed ok. I then pushed the car hard to "teach it" I have some more power but I always drive hard and I have a little more power now than before the mod. Much smoother too.

I connected from the batt to driver fender, batt to driver intake manifold, manifold to bulkhead behind intercooler, intercooler to passenger fender, fender to pass intake manifold. Looks good and all the wires are safely away from hot or moving parts. I only had to use one zip tie.
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Old 02-04-2004, 09:21 PM   #14
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I don't know the specifics, but you can search on ECU reset and learn a bunch. I can only tell you that I reset my ECU at 1000 miles (after driving like a granny during break-in) and the engine felt a lot more powerful.

When I did my grounding kit, I made sure to keep the battery connected so my ECU would not get reset. I think my idle smoothed out a little, and some of the engine stutters went away. But, there was no jump in power, certainly not comparable to an ECU reset.

Craig
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Old 02-05-2004, 07:18 PM   #15
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Thanks paranoid, i bought one of those grounding kits last night, and payment will be sent saturday, so sometime next week i should be vrrroooomm-ing around with a little more power.
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Old 02-12-2004, 04:50 PM   #16
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I picked up one of the grounding kits just the other day and found it had no guide as to where to do most of the points. Do any of you know of someplace I can find a guide for it?
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Old 02-13-2004, 01:24 AM   #17
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Do a search on this and the other Wrx sites (ClubWRX.net, I-Club) and you'll find info on how others have done it. there doesn't seem to a one absolute way to do it.

The directions that came with mine were real vague too.

ScoobyMods has good info too.
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Old 02-13-2004, 06:36 PM   #18
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Just don't use the strut top mounting studs like all the lemmings do....they are just about worthless as grounding points.... just about any other bolt is better except the positive battery terminal
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Old 02-13-2004, 10:11 PM   #19
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Quote:
Originally posted by Uncle Scotty
Just don't use the strut top mounting studs like all the lemmings do
Every pic of the grounding mod I saw has one on the strut tower... ?
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Old 02-13-2004, 10:42 PM   #20
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Quote:
Originally posted by Uncle Scotty
Just don't use the strut top mounting studs like all the lemmings do....they are just about worthless as grounding points.... just about any other bolt is better except the positive battery terminal
I would be interested to see the expression of a person's face if they did use the positive battery terminal.
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Old 02-14-2004, 02:36 AM   #21
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Quote:
Originally posted by NeoteriX
Every pic of the grounding mod I saw has one on the strut tower... ?
And they are ALL wrong. The strut top studs are embedded in rubber in the strut top, and the strut mount is painted on both sides...BAD ground....BAD thinking....
Use the washer bottle bolts and the boost controller cover mount bracket bolts and any 'captive' nut attach you can find, but DON'T use the strut top mount studs.....bad juju!!!

I believe that this is the real reason(one of them, anyway) that some people have good results with the mod and some have poor results.
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Old 02-14-2004, 02:49 PM   #22
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Quote:
Originally posted by Uncle Scotty
And they are ALL wrong. The strut top studs are embedded in rubber in the strut top, and the strut mount is painted on both sides...BAD ground....BAD thinking....
Use the washer bottle bolts and the boost controller cover mount bracket bolts and any 'captive' nut attach you can find, but DON'T use the strut top mount studs.....bad juju!!!

I believe that this is the real reason(one of them, anyway) that some people have good results with the mod and some have poor results.

Would I be able to see pics of your setup?
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Old 02-14-2004, 03:15 PM   #23
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I did mine as to be just about invisible, I made mine using black cable and routed them under/behind....I'm NOT into 'bling' and I don't need to impress anyone...except with the view of my taillights...so there is very little to see, I'm afraid.
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Old 02-15-2004, 12:10 AM   #24
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If you had any pics, they'd still be appreciated. I'd just like to see the specific points you used and how it looks overall. I'm sure I'll be able to find them if I stared at it long enough -- it'd just be like a nice sit down of Where's Waldo?
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Old 02-15-2004, 02:05 AM   #25
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NeoteriX...you have a PM.
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