93 RX-7 AC Setup - MS3 Gold Box
93 RX-7 AC Setup - MS3 Gold Box Hello All,
Thought that I would post up in here to see if anyone has come across this before.
My RX-7 was setup to run AC via the Gen III PCM. Two things have changed since. The car now has a Gen IV LS3 motor and I am moving to a MS3 Gold Box.
The Gold Box runs AC based of a ground signal to tell it that a load is going to be placed on the motor. What I need to figure out is how to run the rest of the setup to kick on the compressor etc. I have all of the original wiring and diagrams to use but need a little bit of a jump start to figure out when to dig in on this.
From what I understand, the Gen III PCM ran a total of 6 wires for AC
3 that operated the Clutch
A/C Request
A/C Clutch Relay Control
A/C Status Signal
3 That go to the LS Pressure Sensor:
A/C Refrig Press Sensor Signal
IAT Sensor Ground
A/C Refrig Press Sensor 5V Ref
Where Im getting stuck with is what the PCM was running based on the pressure sensor. The clutch stuff seems pretty standard as it is taking the request form pressing the AC button to signal the clutch and tell the PCM there is a load. What Im whiffing on is what the pressure sensor does and how I would incorporate that into the new setup.
Thought that I would post up in here to see if anyone has come across this before.
My RX-7 was setup to run AC via the Gen III PCM. Two things have changed since. The car now has a Gen IV LS3 motor and I am moving to a MS3 Gold Box.
The Gold Box runs AC based of a ground signal to tell it that a load is going to be placed on the motor. What I need to figure out is how to run the rest of the setup to kick on the compressor etc. I have all of the original wiring and diagrams to use but need a little bit of a jump start to figure out when to dig in on this.
From what I understand, the Gen III PCM ran a total of 6 wires for AC
3 that operated the Clutch
A/C Request
A/C Clutch Relay Control
A/C Status Signal
3 That go to the LS Pressure Sensor:
A/C Refrig Press Sensor Signal
IAT Sensor Ground
A/C Refrig Press Sensor 5V Ref
Where Im getting stuck with is what the PCM was running based on the pressure sensor. The clutch stuff seems pretty standard as it is taking the request form pressing the AC button to signal the clutch and tell the PCM there is a load. What Im whiffing on is what the pressure sensor does and how I would incorporate that into the new setup.
