I Dug a Hole

After much umming and ahhing over the decision of where to mount the engine ECU + gearbox ECU + associated relays and fuses, the decision was finally made to make use of the existing hole in the firewall, set aside by GM for the clutch master.

It was around 2" diameter, so a cardboard template was cut-out to practice pushing the large ECU harness plugs through...




The first hole was an experiment in leaving the orginal firewall hole diameter and cutting a recess off to one side to house each strand of the harness as we passed it through.

Good in theory, but no cigar... 2" diameter was too small.

On the right is a 3" diameter hole which worked fine.

Time to get cutting...




Getting bigger...






Once drilled-out, all jagged edges were tidied-up with a carbide burr on a drill and lined with a grommet made out of spilt ATF cooler hose.

J