What determines the duty cycle of the A/C compressor?

[ddongbap]

So, 20% of 500whp, is 100whp. Is that how thats works?

[ddongbap]

Originally Posted by Lafiro

Exactly.

Ok fact is, even though the light is on that says the A/C is on, does NOT mean it is engaged 100% of the time.

It only turns the compressor on for a certain amount of time, then turns it off for a certain amount of time. Either that or it does so by temperature somehow, depending on where the knob is turned too.

So for everyone to understand this:
You are is losing 20%(on our stock engine) or so of power when the A/C ( the compressor ) is engaged! And just to clarify one more time for everyone, the compressor is NOT engaged 100% of the time, but it cycles on and off.

This should be the end of people giving out wrong information.

ozmdd is right as well (post above mine).

I'm not trying to disprove the fact that the AC drains power. My point is that it doesn't drain THAT much power.

3WHP difference. The AC was turned on after a few dyno pulls. So the AC was off for a while. The air was ice cold during the first AC pull. So the AC had to be fresh. Now, this might just prove that the clutch engagement system is intelligent, and turns off the AC during high load?

Now, this part is me theory crafting. A lawnmower engine has 2-3ish HP. I don't think one of these would have any trouble powering a AC compressor. It kind of seems high price to pay to run the AC which'll take 20hp.

[Yaris Hilton]

Originally Posted by ddongbap

Now, this might just prove that the clutch engagement system is intelligent, and turns off the AC during high load?

Yes, actually most modern cars do disengage the AC compressor at or near wide open throttle.

[ozmdd]

Originally Posted by camelll

Yeah I found it amusing as well.
You should really quote who you are talking about. I am assuming you are saying this for illusionx?


Again, you should quote who you are posting about, who is giving out wrong information? Illusionx is or was the the only one on here that thinks that the compressor is engaged 100 percent of the time. There have been several post to explain the opposite since that post.

True, quotes are helpful, but mine wasn't directed at anyone, other than simply stating some facts relevant to the thread.

I will quote more in the future.

[LittleRed]

I put in a AEM cold-air intake and my car no longer bogs down with the A/C on...apparently the engine is starved of air under stress...its really easy putting it in....well worth the $150... i also use fuel system cleaners in it on a regular basis and use 91 octane gas..its really quick now

[NH3R717]

22 hp is a ridiculous amount of power for a car a/c. 22 hp = about 16kw. Your home A/C might pull 2-3kw. hp and kw = power the same exact thing but different units.

[krolos]

I have owned V8 trucks, and other small 4 cyl. cars with Ac.
And I can tell you my Yaris has been by far the most sufficient with AC on, the gas mileage changes very little, if at all, yes it does bog the engine down a little,
but for a 1.5 I would say it is pretty good, and really not a whole lot.

33,000 miles on 2008 sedan, and no problems.

[Yarisduder]

Originally Posted by NH3R717

22 hp is a ridiculous amount of power for a car a/c. 22 hp = about 16kw. Your home A/C might pull 2-3kw. hp and kw = power the same exact thing but different units.

+1 000 000 000

That's what I wanted to say!