My car is pretty much stock with nothing added to the engine. So this mod was done cause it was cheap and easy!

My usual driving would consist of having a little hesitation around 3-4K rpms and revs "seem" to struggle going up to 5K rpms. After installing my own grounding kit I noticed a major difference. My grounding kit consisted of 14ft of 4 gauge wires from Home Depot, some terminals bought at an electronics store and some heat shrink wire wraps from Radio Shack. Total cost was less than $20 and I have alot extras left from what I bought.

I followed instructions for grounding points from the DIY threads, except for 2 ares, where instead of grounding to a bolt on the trans and back of head, I put it on the front of the engine and another area in the back of the head. The airbox look hard to take off, so I didn't even bother. But generally, I followed a loop around the engine and everything, like you 're supposed to.

https://www.evolutionm.net/forums/sh...ght=DIY+ground

The last part I did was attaching to the negative terminal of the battery. Took off the connection for less than 3 minutes to attach the wires, so the ECU didn't really have time to reset. After the install I went for a regular drive and instantly noticed how the revs became smoother and consistent going up to 7K rpms!

I did not notice any major difference in the butt dyno, BUT the car seems to pull a little better in the mid-range towards the higher rpms. Not bad at all, for a mod that cost me less than $20 and an hour. So if you are thinking about doing this mod to your "stock" Evo...I would definitely recommend doing it.

Anyways, thought I would share the experience!

 

It´s pretty rare for me feel an improvemente with a grounding kit in a very new car unless the stock grounding kit is not working properly.
Not sure if the they are the same but when we tried that in a brand new EVO V there was no noticeable change.
Now we can feel some the change as those cars are 6 years old and with many kilometers of good races and "issues" on their shoulders : )

 

Sounds like your car has some hesitation problems before - maybe there was an issue with it from the factory. Good to hear you got it fixed up, but I would have taken it in and had Mitsu look at it for free.
Now don't flame me or Mitsu for warranty claims...

 

Get a dynoflash and ur car will be even smoother than it is now.

I have the apexi power ground system. And it added some power according to my butt dyno. This same system made 8.5whp on a STI so I guess it would be about the same for the evo.

 

This is my first turbo'd car so I'm still trying to figure out everything with it, so as far as the hesitation goes, I don't think it was really a "problem". More like the car just seemed to not be as smooth as it should be going up the revs, but it didn't have a jerkiness or anything major like that.

I had a good friend who has 2 AWD turbo DSMs drive it and he did not notice anything like that at all when he drove it. But I guess if there was a "problem" maybe it did help fix it.

I'm definitely will get some kind of tuning in the future, maybe after getting all the parts I want to put on the car first. This mod was cheap and easy, so that's why i did it. Definitely would like to hear more from others' experiences though.

 

My car and every other one I have owned has run better one one day than on another. For this reason and because it often lies to me after I wash my car or change my oil, I hesitate to rely on my butt dyno. However, grounding kits are a good way to reduce voltage drops and to eliminate ground loops.

What a kit does in one application will not necessarliy transfer to another. A lot has to do with how much current is running, how much resitance there is in the wire run, and how much electrical "noise" is present. It is good practice to clean up electrical connections from time to time as vibration and corrosion can degrade their integrity.