[conradb212]

While the stock location on the intake manifold will usually work without problems, the stud on the cylinder head provides a better electrical connection.

Is this especially advisable with the Hondata IMG installed, or does that not make a difference?

 

[conradb212]

We think that this may have been the cause of some of the problems people have been having with the programmable ECU. The common thing in all cases was an engine swap or supercharger. We'e also found that the bolt holding the ground wires on the supercharger manifold comes loose easily. We tested disconnecting the ground and then grounding the ECU and found enough current flowing through the case of the ECU to cause problems. The intake manifold gasket still gives a good ground through the manifold bolts, but the best place for the ground wires is the cylinder head, even if it looks ugly.

I did think the seven manifold bolts still provide good enough grounding even with the IMG, but better safe than sorry. Thanks, Hondata, for researching this and alerting us to this. Especially since the placement of the ground and its possible negative effects is a generic K-Series issue. One question though: you say this may have been the cause of problems with the programmable ECU. Does improper grounding affect a programmable ECU but not a stock ECU?