Hey everyone,
I am working on a 67 Camaro project. Slowly working my way threw installing a GM Performance LS 525hp crate engine with the matching wiring harness and ECU. The car is also getting a Vintage Air Gen IV upgrade. I am wondering if anyone has been able to make a GM Performance ECU control the air conditioning compressor cut off signal?
This is the signal that turns the A/C compressor off when you go WOT so you don't wreck things. Vintage Air Kit's have an option to hook up a WOT switch that sends a 12V signal to the Vintage Air Control unit when you go wide open throttle. This is left up to . The engine/trans/ecu package I've installed uses a drive by wire system. I am attempting to find a way to avoid making some kind of WOT switch that activates off the throttle peddle since I don't have any throttle linkage to work with. All my research has shown that GM Performance uses their own unique OS, making things tricky.
The wiring harness and ECU instructions/wiring diagrams do not show any kind of A/C output function wires.
I've pulled the ECU file and there are A/C command functions in it which can be changed. This makes me wonder if I can add wires to some of the ECU pins, and what pins the A/C command functions might be on..
The other option I've been wondering. The ECU and Wiring harness comes with 2 Cooling Fan control wires. Both are wired to the same Relay. Maybe it's possible to split this and use 1 wire for the fan relay and 1 to act as an A/C clutch cut off signal??
I've included the file I pulled from the ECU for anyone who wants to have a look at it. Also for fun a link to the video of the first time I fired the motor up. Open headers
https://youtu.be/brLJ2bT5iTM