disable auto a/c

Ubetit

My 4 ton home Ac unit pulls 14500 watts... roughly 19 horsepower. 3 horsepower won't run a 4 ton AC compressor but I don't see our little car ac compressors pulling much more than a standard window AC unit that pulls between 2-3 horsepower or 2500-2300 watts depending on BTU rating.

cjr1881

2-3hp would be unnoticeable. Rpms go up at idle and I hear a big difference in my exhaust note when driving as my engine is more labored. If you are in touch with your vehicle's behavior at all you will notice lack of power and it is definitely present. I know when I feel sluggish I look down and sure enough the a/c is on. I wouldn't notice if it were only 2-3 hp. Searching on the net I have seen figures 5-15. I think our cars are on the high side or I am just very sensitive to noticing power change.

ChrisSlicks

I've used my A/C on track several times to keep the windshield defogged in misty conditions. There was no difference in car feel, acceleration or lap times. An auto A/C compressor isn't quite as efficient as a home unit but the comparison isn't that far off. Power is power as was stated, the difference is in a direct drive compressor you will feel the drag more than the power loss (flywheel effect) and in the low rpm range where the car isn't making much power. At most it pulls 5hp when active and it does seem to disengage under WOT. You'll notice 5hp in a 100hp car, but not so much in a 300hp car.

__________________
Hotchkis ARB | Stillen CAI | Art Pipes | Berk CBE | Stillen AP Racing Brakes | AE Performance Oil Cooler | BC Racing ER Coilovers | Doran Control Arms

'10Anamoly

I'm pretty sure the car has different ECU maps for use when the A/C compressor is on. The power you feel come back during WOT is the car switching maps. The timing, idle speed, etc are very different when the A/C compressor is on. Thus, who knows what power you do or dont lose, but its true that the compressor itself doesnt take up 15 hp.

__________________
2013 Ford Mustang GT

374rwhp, 360rwtq SAE / GT500 Axle-Backs / Brembo Pack / Track Pack / Recaros / 6spd

dawudih

I don't think it's a different engine map.
It's the A/C clutch disengaging & putting less load on the engine. The compressors clutch is controlled by a pressure switch. It's cycling off & on every few seconds.
The temp control only controlls how much hot air is allowed to mix with the chilled air, it does not control how long the compressor stays on or off.

KaienZ34

From a man that has used his z on many track events, lap times don't lie.

__________________

Compdoc777

If the ac compressor is overfilled it can cause a drag on the system when it's on.