Welcome to the North American Subaru Impreza Owners Club Monday July 28, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Electrical & Lighting

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 03-02-2002, 02:26 AM   #1
sajohnson
Scooby Specialist
 
Member#: 6140
Join Date: Apr 2001
Chapter/Region: MAIC
Location: Middletown, MD, USA
Vehicle:
2002 WRX 5MT Sedan
WR Blue. Cobb Stage 2

Default Miracle Mod!

I just completed the 'grounding mod'. Man, what a difference!

My WRX had a bad stumble or hesitation between 4 and 6,000 rpm even when fully warm. After adding several ground wires the stumble is gone!

I added 5, 12 gauge, THHN ground wires: one to each strut tower, one to each side of the intake, and one to the firewall. The last 3 are existing factory ground points. All 5 wires terminate at a two-piece solid copper lug on the neg. battery terminal. I used "Copper Shield" anti-oxidant on all connections. Also, I found that the factory ground at the firewall was done over painted metal (lame), so I cleaned that up.

I am amazed at the difference this mod made. I was skeptical but figured the cost was minimal and I had nothing to loose.
* Registered users of the site do not see these ads.

Last edited by sajohnson; 03-11-2002 at 10:35 PM.
sajohnson is offline   Reply With Quote
Old 03-02-2002, 02:38 AM   #2
kurichan
Scooby Newbie
 
Member#: 8282
Join Date: Jul 2001
Vehicle:
2002 WRX Sedan

Default

Okay -- I am skeptical. Where can I get detailed info about this?
kurichan is offline   Reply With Quote
Old 03-02-2002, 02:41 AM   #3
mid9s
Scooby Newbie
 
Member#: 7777
Join Date: Jun 2001
Location: alexandria, VA
Vehicle:
2002 impreza WRX
Blaze Yellow

Default

I would like to know more also
mid9s is offline   Reply With Quote
Old 03-02-2002, 02:45 AM   #4
sajohnson
Scooby Specialist
 
Member#: 6140
Join Date: Apr 2001
Chapter/Region: MAIC
Location: Middletown, MD, USA
Vehicle:
2002 WRX 5MT Sedan
WR Blue. Cobb Stage 2

Default Check Here

http://www.i-club.com/forums/showth...threadid=141932

Also see the thread, "Stumble During Acceleration"
sajohnson is offline   Reply With Quote
Old 03-02-2002, 08:18 AM   #5
titsataki
Scooby Specialist
 
Member#: 4402
Join Date: Feb 2001
Chapter/Region: NESIC
Location: New Haven, Connecticut
Vehicle:
2009 Outback XT
DGM

Default

link does not work??

T.
titsataki is offline   Reply With Quote
Old 03-02-2002, 11:39 AM   #6
Zahnster
Scooby Specialist
 
Member#: 2918
Join Date: Nov 2000
Location: Simi Valley, CA, USA
Vehicle:
2002 Impreza WRX
Silver Sedan

Default

Zahnster is offline   Reply With Quote
Old 03-02-2002, 12:17 PM   #7
Tex-WReX2
Guest
 
Member#:
Default search under

donrgolf



user name
Us Texans actually do have a few tech posts!
  Reply With Quote
Old 03-02-2002, 12:17 PM   #8
IMPREZIV
Scooby Specialist
 
Member#: 862
Join Date: Feb 2000
Location: NY
Default

Just did this mod yesterday as well. Holy S, what a difference!

Here is how we did it, and I will post pics soon.

2 gauge wire from Neg battery terminal to ground distributor block. 8 gauge wire from block to 5 separate ground points. Hesitation is gone, accel surges at low rpms, gone. And for those of you who follow my compaining, my EVC-4 is now functioning properly at all boost and RPM levels.

Entire cost of project, $40.
Time under the hood, 1-2 hours.

One of, if not the best mod I have ever done. Highly recommended, especially for those experiencing accel surges and bucking.

Good luck, speed safely.

Pete
IMPREZIV is offline   Reply With Quote
Old 03-02-2002, 01:12 PM   #9
kurichan
Scooby Newbie
 
Member#: 8282
Join Date: Jul 2001
Vehicle:
2002 WRX Sedan

Question

And this works for ALL '02 WRXs, not just chipped cars, right?
kurichan is offline   Reply With Quote
Old 03-02-2002, 01:26 PM   #10
dwx
Scooby Guru
 
Member#: 8343
Join Date: Jul 2001
Chapter/Region: MWSOC
Location: Atlanta, GA
Vehicle:
2005 2012 Jeep
2013 DGM BRZ

Default

Jorge (riftswrx) did this a few months ago as well. www.projectwrx.com has a writeup on it. I've never heard any bad things come from doing this mod to any level of car.
dwx is offline   Reply With Quote
Old 03-02-2002, 03:51 PM   #11
BIGSKYWRX
Scooby Guru
 
Member#: 7958
Join Date: Jul 2001
Location: Plains of Eastern Montana
Vehicle:
09 GH B+

Default

sajohnson,

As a electrically challenged person (ECP ), I am unfamiliar w/ the acronym THHN when refering to ground wires, could you please explain? Also unfamiliar w/ your 2 piece solid copper lug you mention. What did you use for ends at your contact points?

Sorry for all the questions, but an also experience a slight hesitation occasionaly and would like to end it.

Thanks in advacne,

Big Sky
BIGSKYWRX is offline   Reply With Quote
Old 03-02-2002, 06:18 PM   #12
Conduit
Scooby Specialist
 
Member#: 6162
Join Date: Apr 2001
Chapter/Region: South East
Location: Orlando, FL. USA
Vehicle:
2002 WRX
MBP, 1st WRX Ever in FL.

Default

THHN is the stiff, solid core wires used in home wiring. It's cheap, and can be had at most any home improvement store. Watch the jacketing on heat sources, it doesn't like heat. I have a 1000 foot spool in my car room as we speak
Conduit is offline   Reply With Quote
Old 03-02-2002, 06:22 PM   #13
Concillian
Scooby Guru
 
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
Vehicle:
2002 WRX Sedan
Midnight Black

Default

THHN = Thermoplastic High Heat Nylon

It refers to the insulation on the wire, which is spec'ed to 90 C. It's mostly used by builders and such.

Most silicone insulated welding wire is also spec'ed to 90 C.
Concillian is offline   Reply With Quote
Old 03-02-2002, 08:48 PM   #14
spd wgn
Scooby Newbie
 
Member#: 8571
Join Date: Jul 2001
Location: arlington VA
Vehicle:
2002 wrx

Default

there's probably a wide range of wire you can use...
I used 10 gauge primary (stranded) automotive wire and soldered and crimped ring connnectors
spd wgn is offline   Reply With Quote
Old 03-03-2002, 12:08 AM   #15
datdudedennis
Scooby Specialist
 
Member#: 3928
Join Date: Feb 2001
Location: Boston, MA
Vehicle:
2002 WRX sedan
WRB use to be MBP

Default

i did this mod today. i used 8 gauge audio wire crimped to terminal connectors. my mods are mbc, intake, and exhaust. i dind't notice much, i did experience though that it was easier to take off from a stop in 2nd gear and i can shift to fifth at 38mph or above and not get vibrations instead of 40mph and above. but the weather could have played a roll.

dennis
datdudedennis is offline   Reply With Quote
Old 03-03-2002, 12:31 AM   #16
mynew02
Scooby Specialist
 
Member#: 13726
Join Date: Dec 2001
Location: Maryland
Vehicle:
2002 WRX - 264 AWHP
ION-Turbo&LINK 12.83@106

Default

You wouldn't have noticed anything if you didn't have a problem to begin with. This is not a performance mod and you will not notice better starts. What you may have noticed is better performance due to resetting your ecu.

It only fixes a problem with a mild hesitation while accelerating throught 3-5K rpm.

If you are having problems with a slight jerk at 3-5K rpm do this mod. It works... fixed me anyway.


-Jonathan
mynew02 is offline   Reply With Quote
Old 03-03-2002, 12:50 AM   #17
sajohnson
Scooby Specialist
 
Member#: 6140
Join Date: Apr 2001
Chapter/Region: MAIC
Location: Middletown, MD, USA
Vehicle:
2002 WRX 5MT Sedan
WR Blue. Cobb Stage 2

Default Wire

The THHN I used is stranded and gas and oil resistant.

The insulation would be more important if we were running +12 volt supply wiring. From a safety standpoint since these are Neg. (-) ground wires, they could be bare. From a funtional standpoint though, bare wire might be problematic because any place the wire came in contact with metal would become a potential ground point.
sajohnson is offline   Reply With Quote
Old 03-03-2002, 11:40 AM   #18
mcu81
Scooby Specialist
 
Member#: 5796
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: Moonshineville
Vehicle:
2013 BRZ & 2004
WRX

Default

one far out crazy question about this. they say if you get struck by lightning that it will ground out threw your rubber to the ground. is this going to help or hurt this cause? weird, wild, question just was thinkin bout this.........
mcu81 is offline   Reply With Quote
Old 03-03-2002, 11:47 AM   #19
PDG
Scooby Newbie
 
Member#: 11049
Join Date: Oct 2001
Location: Chelmsford, MA
Vehicle:
02 WRX, BLACK WAG
Somewhere around stage 4

Default

Rubber is an insulator, the lightning will not ground out through the tires.

If lightning hits your car it will travel on the outside of the car's 'shell' of an metal enclosure.

Goodies learned from the Boston Museum of Science.
PDG is offline   Reply With Quote
Old 03-03-2002, 12:09 PM   #20
mcu81
Scooby Specialist
 
Member#: 5796
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: Moonshineville
Vehicle:
2013 BRZ & 2004
WRX

Default

thanks PDG.....good good good.........
mcu81 is offline   Reply With Quote
Old 03-03-2002, 02:35 PM   #21
sajohnson
Scooby Specialist
 
Member#: 6140
Join Date: Apr 2001
Chapter/Region: MAIC
Location: Middletown, MD, USA
Vehicle:
2002 WRX 5MT Sedan
WR Blue. Cobb Stage 2

Default mcu81

Well there's one less thing to worry about!
sajohnson is offline   Reply With Quote
Old 03-05-2002, 10:32 PM   #22
Somber
Scooby Newbie
 
Member#: 5118
Join Date: Mar 2001
Location: Oklahoma City, OK, US
Thumbs up another satisfied modder

here is my story...

my car was "surging" a bit at low partial throttle in the 3-5K RPM range... I am not in this range very often without being near WOT, so I hardly ever noticed it, but every once in a while...

when I read about this "miracle mod", I went out and purposefully searched for the surging... after a bit, I found that I could produce it in a very repeatable manner... 3200 RPM, low throttle, mild acceleration - I would get a surging not unlike feathering the throttle...

I have done an ECU reset since noticing this issue, and it had no effect, so I decided to give this mod a shot and see what effect it had...

I didn't want to run 5 wires without knowing that I really needed to, so I started with a single 8gauge woven cable from a local stereo shop that I cut to length and crimped on eyelets... I connected this wire from the bolt through the negative ground cable on the battery, to the drivers side ground bolt on top of the manifold on the engine... I then went out for a test run... there was a noticeable improvement - the surging still there, but much more faint, almost imperceptible...

I then made a second cable and ran it from one of the passenger side strut top mount bolts to the passenger side manifold ground bolt... went for a second test run:

GONE!!! all traces of the surging gone, I worked really hard at trying to reproduce any surging, and could not under any condition...

I'm going to drive for a few more days and make sure I don't suffer any additional surges...

after that, I think I'll remove the wires and see if it comes back (tho I'm almost afraid to)...

just a bit more information for everyone to think about...

I do not have any better idea about what this does, other than good grounding is a good thing, but it made a marked improvement in my car...

Paul
Somber is offline   Reply With Quote
Old 03-05-2002, 11:00 PM   #23
IMPREZIV
Scooby Specialist
 
Member#: 862
Join Date: Feb 2000
Location: NY
Default

Hey Paul
I had a similiar experience, but unfortunately and came back and went away again, and now its back. That leads me to believe that this is the way in which to fix the problem, now I have to just isolate exactly where the problem is stemming from pay special attention to grounding that. I will keep everyone up to date as this progresses.

Good luck
Pete
IMPREZIV is offline   Reply With Quote
Old 03-05-2002, 11:21 PM   #24
Somber
Scooby Newbie
 
Member#: 5118
Join Date: Mar 2001
Location: Oklahoma City, OK, US
Default

well maybe I won't "unground" for the sake of science... LOL

please keep me in mind when you do figure out what worked...
Somber is offline   Reply With Quote
Old 03-05-2002, 11:41 PM   #25
sajohnson
Scooby Specialist
 
Member#: 6140
Join Date: Apr 2001
Chapter/Region: MAIC
Location: Middletown, MD, USA
Vehicle:
2002 WRX 5MT Sedan
WR Blue. Cobb Stage 2

Default Good Connections

Whatever gauge wire you use and wherever you decide to add extra grounds make sure you use some type of conductive inhibitor. Try these links:

http://tnbsun4.tnb.com:8080/tnbcat/t...alog_home_page

http://tnbsun4.tnb.com:8080/tnbcat/t...ch_indic_flg=T

If they don't work, I used Thomas and Betts Kopr-Shield (P/N CP8-TB). Their site is

www.tnb.com
sajohnson is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Grounding mod FAQ the right way thread pics too! Davenow Electrical & Lighting 714 06-23-2014 09:51 AM
Single-point ground mod vs. Multi-point ground mods DrBoy01 Normally Aspirated Powertrain 5 12-05-2003 04:21 PM
Question about the Single Point Grounding mod Bankheist Texas Impreza Club Forum -- TXIC 8 02-25-2002 10:59 AM
The grounding mod Kartoffel Texas Impreza Club Forum -- TXIC 30 02-21-2002 11:04 AM
Battery Connections & Grounding Mod JenisonWRX Electrical & Lighting 10 02-18-2002 11:01 PM


All times are GMT -4. The time now is 03:57 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.