Yea I've heard it makes a big difference where they are attached and the path they follow. They say to try a few different locations to get the best results. I am very interested where you attached yours.

Thanks for the info!

So in the same vein, I guess Monster Cables for audio are also a waste of money, huh?

What you're refering to as big difference is relatively speaking of course. The difference felt by doing this properly is very very small to begin with anyway. The thing I like best is smoother starts and less hesitation of engine from standstill. I can't confirm about more torque and power. All I can say is the difference feels like putting an intake, which is "just a feeling". Putting on an intake seems to lose some torque at low rpm. Better ground seems to recover this low end torque. Don't come asking me to do a dyno. Some people make it sound like dyno runs are cheap/free. Give me 70 bux and I'll be happy to do it for you.

This is the connection I used. The basic idea is to ground major engine components and chassis without shorting any circuit.

I wanted to ground the engine block (below the cylinder head), but couldn't find a suitable location to bolt the grounding wire to, so I used the body frame near the "Injen Hole".

http://users.rcn.com/enamho1/mazda/hotearth.gif

This is price for Rockford Fosgate cable, not "garden variety" shit
Alex
Edited-Monster cable is $4/ft-Power Flex-Moster calls it the best.

$20/ft is a WASTE of money

Home made version "hyperground"
 

Works for me..... FWIW. Did it mostly for improvement in 600 WRMS stereo system, but it seems to help a bit in power delivery as well. And, today was the first time I've seen over 24mpg city/highway driving (back and forth to work, running around, etc.) It seems to have helped fuel economy a bit too! :)

4 gauge JSC oxygen free copper high strand stereo wire (hey, I can get this stuff cheap!) :D

Engine to Chassis

http://images2.fotki.com/v20/photos/...SC00382-vi.jpg

Battery to Chassis

http://images2.fotki.com/v21/photos/...SC00384-vi.jpg

Engine to Battery

http://images2.fotki.com/v21/photos/...SC00385-vi.jpg

Another angle of #3 shot

http://images2.fotki.com/v20/photos/...SC00387-vi.jpg

Tada!

http://images2.fotki.com/v20/photos/...SC00388-vi.jpg

MackDaddy,
Nice clean work on the wiring. Glad it's working for you too.

Schwing!
 

Thanks my brother..... gotta look good for Carlisle! :D

I dug up some ground cables left over from previous aircraft projects and installed 2 new grounds. One from the battery to engine and one from the other side of engine to existing ground point on right fenderwell. I don't think it's any faster, but it sure feels smoother below 3000 rpm. Price was right and it didn't take long. I think you could use pre fabricated battery cables from any auto parts store.