engine ground mod.
 

Hey guys and gals I found this mod on a WRX forum. Wonder if this works on our rides. They seem to talk about it being done on a RX-7 etc. etc. Feedback people.

here's a clip from thier thread:





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.


here's a reasoning from i-club. dont really know if this would work on our cars???? im going to give this a try, its cheap wont hurt to try it out!

O.k. this is sort of a shot in the dark, but the reason the ground mod fixes the problem of the stumbling. Is that when the air passes thgough the throttle body it creates a staic charged that possibly might screw with the signials coming out of the TB's sensors. I used to be a DSM guy and the 4G63 had a little thing that connected the TB to the rest of the engine to ground it. Took me and a friend a while to come up with a reason for having this little metal thing for no reason. I feel this same thing is comparable to the WRX grounding MOD.

thanks! good info.

My friend on clubrsx.com tried it too & said that it didn't really add power, just made the engine respone a little quicker in the midrange.

Don't the sensors all wire back to the computer? As I understand the computer feeds a 0.5-5.0 volt signal to the sensors. The sensors then return the voltage to the computer (with resistance) and the computer interprets the return voltage. Therefore, the sensors would all be cleanly grounded to the computer, yes/no?
I didn't think the computer would read any information using the engine block metal.

okay, since i freely admit i do not know everything....and i definetely dont about this subject, does this have anything to do with EMI?