How to Properly Ground a Race Car

[buzzinhalfdozen]

Bobby, don't have a fast system but B+ and B- both need to be directly to the battery for the ECU. Most of the systems I've seen as far as sensors go the ECU has discreet circuits for them ( the reference, low reference (ground) and signal all go back to the ECU, then use the main ECU ground which should be hooked directly to the battery. Most agree that any other inputs....O2's input signals (cam sync, crank sensor if it's a hall effect ) should share the ground that the ECU uses to eliminate ground offsets. All other things Alt. electric water pumps, fans ect. can be chassis grounded provided the engine AND chassis are properly grounded. I like to run a ground between cylinder heads and to chassis just to provide a solid ground path. To me the bottom line is to try and keep EFI componemts grounds seperated from everything else...by grounding the ECU directly to the battery you do just that.