How to Properly Ground a Race Car

[west coast]

The computer wires for ground need to go all the way to neg- right to the battery post. When i did this last year to my car it totally change my tune up. I had all ground coming together on a post insulator then a battery cable to the battery, computer was getting noise in that short run from fans and water pump. Bobby what efi are you running.

[Bobby Fazio]

Originally Posted by west coast

The computer wires for ground need to go all the way to neg- right to the battery post. When i did this last year to my car it totally change my tune up. I had all ground coming together on a post insulator then a battery cable to the battery, computer was getting noise in that short run from fans and water pump. Bobby what efi are you running.

Fast XFI 2.0, I always wire computer to battery. However, other things like water pump, innovate O2 logger, distributor Hall effect sensor grounds, etc are all chassis or engine grounds.