A/c And Ecu

[mrsr32]

i've taken the a/c out of my r32 and you can only demist the windscreen with a/c on (can't turn it off and it doesn't have foot/demist mode).

Does it have any affect on the ecu map if it has no a/c compressor to turn on?

[Jayden.K]

No. When you say remove ac do you mean your heater/evaporator box will the flaps inside? Ecu doesn't control your ac. It only recieves a signal to put the revs up when engaged. R34 the ecu disengages the compressor on wide open throttle. Don't no if r32 Is the same

[mrsr32]

everything in the eng bay to do with the a/c is gone, so i only have 2 pipes poking out the firewall.

i think it adjusts the aac to raise the revs when a/c is turned on.

[Jayden.K]

correct. so you are safe to remove it all

[mad082]

It adjusts the aac at idle to help cope with the additional load on the engine. When revving it will revert back to the mapping

[jiffo]

The centre console aircon controls (auto amplifier) send the clutch signal straight to the ecu as an input (pin 46)

The ecu sends an output (pin 9) to the clutch relay and away it all goes.

This is how the ecu knows to bump up the idle via the AAC or the FICD.

The ecu will also cut the aircon clutch when it decides, (from inputs like TPS, AFM, RPM) that the engine is maxed and needs a bit of help.