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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.

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Old 11-30-2012, 08:23 AM   #1
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Cusco Earth Grounding Kit

Just recently saw this featured for these cars, does a simple grounding kit really benefit? Would like some feedback from previous owners if possible.
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Old 11-30-2012, 08:36 AM   #2
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No. They would provide benefit on older era cars (90's/80's) but on a modern car are a waste of money. Search any of the other numerous forums for popular 20xx era cars (WRX, Z's, etc) and you will see the same results.
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Old 11-30-2012, 09:09 AM   #3
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The only differences in that dyno comparison are noise. Shame on a company for trying to use it for marketing.
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Old 11-30-2012, 09:13 AM   #4
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i had a buddy club condenser on my Mazda 3 and it did nothing
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Old 11-30-2012, 10:21 AM   #5
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Voodoo magic! That dyno is within standard variance.
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Old 11-30-2012, 10:52 AM   #6
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a grounding kit does nothing. yea, it may provide better amperage, say if you had a bunch of electronics going...otherwise, nothing.
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Old 11-30-2012, 11:36 AM   #7
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Waste. Of. Money.
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Old 11-30-2012, 11:36 AM   #8
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Snake oil!

Although maybe in combination with a power conditioner, a hyper voltage system, and a Tornado you could get like 75MPG and another 100HP!

In all reality if a vehicle ends up benefiting from an upgraded grounding system it's purely the result of the original one either being insufficient (whether from the factory or due to end user upgrades) or defective. I had a vehicle where the primary grounds from the battery were corroded inside the wiring badly. Fuel economy nor power seemed affected, but things like dim headlights, a weird sounding horn, and an inconsistent idle did happen.
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Old 11-30-2012, 11:54 AM   #9
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If there's a Group Buy and they're like a $1 per kit, count me in

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Old 11-30-2012, 12:24 PM   #10
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Cusco seems to produce a lot of parts that don't really provide any results, this and the big bore throttle body seem to just be out there to take peoples money. Some people will buy it just because they think it wouldn't be available if it didn't add power or they want it for bragging rights on the show circuit. I don't have a lot of respect for Cusco for offering stuff like this.
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Old 11-30-2012, 12:48 PM   #11
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Can be easily replicated with a few feet of 4 guage wiring.

Also, as stated that dyno graph is BS - Cusco trying to scam the ricers.
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Old 11-30-2012, 03:05 PM   #12
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Walk in to any Yellow Hat or Autobacs in Japan and those kits are everywhere.


I think you may get more gains from one of those eBay, electric turbo fans!

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Old 11-30-2012, 03:17 PM   #13
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I mean if your putting a badass stereo in I could see it. It can help if your lights dim when the sub hits but I'm not having any issues like that at all.
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Old 11-30-2012, 03:20 PM   #14
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Lots of newer cars have crap grounding. My 05 WRX and 10 STi both had dinky little ground wires connecting to the chassis. Haven't really looked at the one on the BRZ yet. But since every device that you ground to the chassis has to go back to that point, it can help depending on what all you're hooking up (stereo, gauges, cameras, gps, lights, etc).

For the most part (stock car), no real difference. If upgrading the sound system, it can mean the difference between headlights dimming or not. With my WRX, I had headlight dimming issues so I put a capacitor in the system because I thought that was supposed to help (hey, I was dumb). In the end, I ditched the cap and made a grounding kit from 8ga power wire from Al & Ed's at like $1/ft (might have even been less). I soldered all the terminals and heatshrinked them. The result was much better and my headlights never dimmed when the subs hit after that.

Paying money for a grounding kit is a waste unless you are absolutely unable to create one on your own. Buying wire, strippers, terminals, heatshrink does add up. Claims of 2 HP gains are pretty worthless, if you ask me. Look at some dyno graphs of people doing back to back runs, they change slightly every run.

There are several topics on NASIOC about this with DIY guides as well. Look up "big 3 mod".
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Old 11-30-2012, 04:02 PM   #15
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Sadly, I think I'm the one that introduced grounding mods to north america on Nasioc, way back in the day. It was something that the Legacy twin turbo customers noted on the 2nd gen twin turbo's. Purely an accidental byproduct of them trying to get the ultimate sound quality from the McIntosh audio systems that were an option. It was a big thing then (the McIntosh), and in the process of grounding out the system for better audio, the Legacy bbs (in Japan) noticed that the car ran *much* better.

I tried it myself (did I ever mention I spent 15 years living in Japan?), and reluctantly had to agree with them. This was before any of the aftermarket companies had heard of it, so it was all backyard stuff - heading down to Akihabara and getting all the cables/connectors and doing it ourselves. Due to our experience with it, we went to Subaru of Japan and talked about it, and interestingly enough, on the S202 I tested a year or so later, they had actually beefed up the grounding 4x compared to the earlier model Impreza.

But, that's pretty much the last time grounding kits ever had any major impact on a car. The issue was found and resolved at the manufacturer level, and hasn't popped up since then. It's just that it's a highly profitable and easy to sell product, so they keep selling them.
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Old 11-30-2012, 04:08 PM   #16
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Sadly, I think I'm the one that introduced grounding mods to north america on Nasioc, way back in the day. It was something that the Legacy twin turbo customers noted on the 2nd gen twin turbo's. Purely an accidental byproduct of them trying to get the ultimate sound quality from the McIntosh audio systems that were an option. It was a big thing then (the McIntosh), and in the process of grounding out the system for better audio, the Legacy bbs (in Japan) noticed that the car ran *much* better.

I tried it myself (did I ever mention I spent 15 years living in Japan?), and reluctantly had to agree with them. This was before any of the aftermarket companies had heard of it, so it was all backyard stuff - heading down to Akihabara and getting all the cables/connectors and doing it ourselves. Due to our experience with it, we went to Subaru of Japan and talked about it, and interestingly enough, on the S202 I tested a year or so later, they had actually beefed up the grounding 4x compared to the earlier model Impreza.

But, that's pretty much the last time grounding kits ever had any major impact on a car. The issue was found and resolved at the manufacturer level, and hasn't popped up since then. It's just that it's a highly profitable and easy to sell product, so they keep selling them.
I completely agree... Those were products from when companies started mainstreaming aluminum engine blocks and heads yet still used the same sizes and amount of grounding cables that iron blocks had.

I spent 8 years in Japan total. 2 1/2 years in Sasebo and 5 1/5 in Iwakuni, just south of Hiroshima.

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Old 11-30-2012, 05:08 PM   #17
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Lots of newer cars have crap grounding. My 05 WRX and 10 STi both had dinky little ground wires connecting to the chassis. Haven't really looked at the one on the BRZ yet. But since every device that you ground to the chassis has to go back to that point, it can help depending on what all you're hooking up (stereo, gauges, cameras, gps, lights, etc).

For the most part (stock car), no real difference. If upgrading the sound system, it can mean the difference between headlights dimming or not. With my WRX, I had headlight dimming issues so I put a capacitor in the system because I thought that was supposed to help (hey, I was dumb). In the end, I ditched the cap and made a grounding kit from 8ga power wire from Al & Ed's at like $1/ft (might have even been less). I soldered all the terminals and heatshrinked them. The result was much better and my headlights never dimmed when the subs hit after that.

Paying money for a grounding kit is a waste unless you are absolutely unable to create one on your own. Buying wire, strippers, terminals, heatshrink does add up. Claims of 2 HP gains are pretty worthless, if you ask me. Look at some dyno graphs of people doing back to back runs, they change slightly every run.

There are several topics on NASIOC about this with DIY guides as well. Look up "big 3 mod".
Yes but then you'd be stupid to pay for one of these kits for that purpose too. These kits are a waste of money, if you want massive grounding cables you can use tons of very inexpensive cable for your big 3/4/5/6 mods..
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Old 11-30-2012, 05:15 PM   #18
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Yes but then you'd be stupid to pay for one of these kits for that purpose too. These kits are a waste of money, if you want massive grounding cables you can use tons of very inexpensive cable for your big 3/4/5/6 mods..
I totally agree. This was pretty much my point, tho I took a lot longer saying it.
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Old 12-02-2012, 11:15 AM   #19
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my .02 cents on grounding kits based on my previous experience (Civic Si) was that i did notice better response from the throttle. At the time when i bought it i believe it was $10 I didn't really feel like it provided any additional benefit to my car but since i had it installed already i just left it. I thought the throttle response was improved but i didn't want to believe it because many time its a physiological thing.

It wasn't till i was about to sell the car did i remove all the grounding kit, that as i was driving my shifts were all off (that day the only thing i removed was my grounding kit). In a way i had to adjust my driving to match the car again.

I was planning to reinstall my old grounding wire kit to the BRZ this weekend just for kicks to see if it does help improve the throttle response.
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Old 12-02-2012, 11:24 AM   #20
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I added my own grounding strap to the FI computer a week after I got my car. Why? It made my idle dip less. Not snake oil. They skimped on grounding the motor well for high RPM use. you can make a few cables for alot less tho cusco kit is neat and inclusive
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Old 12-02-2012, 11:50 AM   #21
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I added my own grounding strap to the FI computer a week after I got my car. Why? It made my idle dip less. Not snake oil. They skimped on grounding the motor well for high RPM use. you can make a few cables for alot less tho cusco kit is neat and inclusive
What gauge did you use?
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Old 12-02-2012, 11:51 AM   #22
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I had a DSport mag where they looked at all the grounding kits they tested over the years. It was hit or miss on which cars gains and which didn't. Don't think it even favoured the older cars. Very random. I'll see if I can find the magazine...

Edit: OK, this example isn't great because these are probably modded cars, and it is a mix of turbo and NA, but here it is:



That Sun Grounding kit is 3 gauge, and the Apexi is 8 gauge. Neither are cheap.
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