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Old 04-25-2002, 06:09 AM   #1
Code-7
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Member#: 5077
Join Date: Mar 2001
Location: "Ludicrous speed....GO!!!"
Vehicle:
'97 e39 540i6
Black

Default Anybody do the 'grounding mod' yet?

Going to do this later today (thurs). Between 3k and 4k RPM's I'm experiencing a bucking and slight surging of the car under low or moderate throttle. Any of you guys experiencing this as well?

I'll let you know how it changes.

http://i-club.com/forums/showthread.php?threadid=141932
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Old 04-25-2002, 12:49 PM   #2
MRX7
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1996 TransAm WS.6
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This is a common prob in the RX-7's as well.....known as the 3800 hesitation.

Im yet to have the problem, so I can't make many suggestions...if you want, you can head to the forums and do a search (top right corner) and see if that helps you at all?
http://www.rx7club.com/forum/

- Jason
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Old 04-25-2002, 07:10 PM   #3
Thunderchief
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Member#: 17633
Join Date: Apr 2002
Chapter/Region: AKIC
Location: Anchorage AK
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05 STI
Gray/05 GSXR 1k

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I got the same problem with my ride let me know if it fixes your problem i wont be able to do mine till this weekend.
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Old 04-25-2002, 08:26 PM   #4
AK_2002_WRX
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Chapter/Region: AKIC
Location: anch, ak
Vehicle:
2017 Ram 2500
dark blue

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i want to do this mod too! we should get together and do it at the same time
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Old 04-26-2002, 12:56 AM   #5
Code-7
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Join Date: Mar 2001
Location: "Ludicrous speed....GO!!!"
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'97 e39 540i6
Black

Default

Crap, won't be able to do it til tomorrow. (friday)

I went to both Lowe's and Home Depot looking for 8 awg ring terminals and neither one of them had them. By the time I went back to Pyramid (bought wire there earlier) they were closed. I didn't want to pay $4 bux for four gold ring terminals (overkill!), figuring I could get some cheap ones at a hardware store. Turned out to be a bad idea, all the ones I went to only carried them up to 10 awg.

Also, most of the ground bolt nuts in the engine bay are 12mm, so lo and behold, Lowes, Sears and Home Depot only carried the tools individually up to 11mm. If you wanted 12mm you had to buy a set. So, I ended up paying $30 bux for a set of tools. (Needed them anyway, but I hate being forced into a purchase because you only need *one* item at the time).

All in all, what a non-productive day. Tomorrow I'll revisit some audio shops and see if I can find the correct ring terminals. Big enough to fit around the 12mm bolts and accommodate 8 gauge wire. I'm going to use a distribution block to split the 8 gauge wire, and run one 4 gauge wire into it from the battery. Give it a cleaner look.

I'll make one last desperation attempt tonight at fred meyer. I doubt they'll have ring terminals, but I guess we'll see.
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Old 04-26-2002, 02:15 AM   #6
Code-7
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'97 e39 540i6
Black

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Update:

Bah, Fred Meyer sucks.
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Old 04-27-2002, 01:37 AM   #7
Getagrip
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BRZ

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My car does it ,too. I figured it was normal.
Cars can't be perfect, you know.
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Old 04-27-2002, 03:30 PM   #8
Thunderchief
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Join Date: Apr 2002
Chapter/Region: AKIC
Location: Anchorage AK
Vehicle:
05 STI
Gray/05 GSXR 1k

Post Ring-Terminals

I got a bunch of spare ring terminals at work i can bring in but im not sure what sizes they are.....




NM i dont have any anymore musta gave em away.

Last edited by Thunderchief; 05-02-2002 at 08:19 PM.
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Old 04-27-2002, 04:07 PM   #9
akwrxdb
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It is about 12:15 on Saturday afternoon and I am doing this mod as we speak. I will let you know how it comes out.

DB
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Old 04-27-2002, 04:10 PM   #10
akwrxdb
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Platinum Silver Metalic

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Try Frigid North for wire and parts. It is off of Spenard.

DB
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Old 04-27-2002, 04:12 PM   #11
Tusin
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Damn, even my VW has the same Surging at the same RPMS.
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Old 04-27-2002, 08:37 PM   #12
akwrxdb
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2002 WRX Wagon
Platinum Silver Metalic

Default

I completed this mod and I ran one extra ground wire to the top of the drivers side strut tower as well. I had to change out my battery terminal bolt for a longer one to be able to fit all 6 connections on the negotive battery terminal. This mod removed what I like to call the flat spots in the acceleration of the car. In my car there was one at about 4800 rpm. I call it a flat spot because that is what it feels like when I am accelerating. Like the car is almost not getting enough air or something and just flattened out. The mod fixed that. Now it is totally smooth and solid acceleration through the rpm range. If anyone has any questions then let me know.

DB
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Old 04-27-2002, 09:47 PM   #13
Code-7
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Member#: 5077
Join Date: Mar 2001
Location: "Ludicrous speed....GO!!!"
Vehicle:
'97 e39 540i6
Black

Default

I got the same results. Any 'rough' spots are no longer there, and acceleration is simple and smooth. Ah, just the way I like it.
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Old 04-28-2002, 04:50 AM   #14
KapaFool
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Chapter/Region: AKIC
Location: Anchorage ALASKA
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2010 WRX4FD
White

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Yah might have to point out your connections to me.
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Old 04-28-2002, 05:10 AM   #15
Code-7
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Join Date: Mar 2001
Location: "Ludicrous speed....GO!!!"
Vehicle:
'97 e39 540i6
Black

Default

Connections 1&2 - There's one ground point on each end of the manifold. Very obvious and easy to spot, just a bolt on each end sticking straight up. You'll see other ground wires already going into each one.

There's another bolt on the firewall, directly in the middle of the car behind the intercooler. It also has a ground going into it.

Another is right next to battery, on the driver side fender.

The last is on the passenger side strut tower. You'll see a black metal strip connected to two of the strut bolts, then going down behind the firewall. Just connect the ground to one of the bolts.

Here's a picture from the other thread:
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