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

[Lafiro]

Don't notice the difference? LOL stop kidding yourself.

So I took the diagnostic tool and plugged it into the car a few months ago. And I noticed something rather interesting.

At idle the engine is under little load, maybe 10%.

When the engine is in drive, but at a standstill, it jumps to around 27-30% load.

And when the A/C is being used, the load on the engine jumps to 42-52%(I forgot the exact amount)

Now, when you hit the gas, no matter how much you stomp on it, the A/C being ACTIVE will reduce 20-22% of the engine. Which to our 106hp engine means roughly 20-22housepower is gone because of it.

Don't believe me, test the car yourself when you know the A/C just kicked in, and use a nice scanning tool with graphs.

I tested this on my friends mercedes. He took it to the dyno, so we know its HP/torque. At the end, simple math equated that with his engine load raising just a few percent, we multiplied that by the horsepower put down/at the crank. Noticed, it was the exact 20-22horsepower of the engine that was being used.

This is why in our car that 20-22HP makes a really big difference, but in my friends Mercedes putting down 518 at the wheels, it really doesnt feel like anything is on at all.

This makes me really sad to know how weak this 1.5 engine is, but at the same time, happy that it does so good on gas, and thats why I own it. That and I like how it looks/drives! lol

[ddongbap]

Originally Posted by Lafiro

Don't notice the difference? LOL stop kidding yourself.

So I took the diagnostic tool and plugged it into the car a few months ago. And I noticed something rather interesting.

At idle the engine is under little load, maybe 10%.

When the engine is in drive, but at a standstill, it jumps to around 27-30% load.

And when the A/C is being used, the load on the engine jumps to 42-52%(I forgot the exact amount)

Now, when you hit the gas, no matter how much you stomp on it, the A/C being ACTIVE will reduce 20-22% of the engine. Which to our 106hp engine means roughly 20-22housepower is gone because of it.

Don't believe me, test the car yourself when you know the A/C just kicked in, and use a nice scanning tool with graphs.

I tested this on my friends mercedes. He took it to the dyno, so we know its HP/torque. At the end, simple math equated that with his engine load raising just a few percent, we multiplied that by the horsepower put down/at the crank. Noticed, it was the exact 20-22horsepower of the engine that was being used.

This is why in our car that 20-22HP makes a really big difference, but in my friends Mercedes putting down 518 at the wheels, it really doesnt feel like anything is on at all.

This makes me really sad to know how weak this 1.5 engine is, but at the same time, happy that it does so good on gas, and thats why I own it. That and I like how it looks/drives! lol

I've fully dynoed my car with ac on and off. There was only a 3 whp / wtq difference.

Third gear pull, on a 95degree day.

Anyways, try to be little me all that you want, and tell me more about how I'm kidding myself. I've dynoed the Yaris. And the Yaris isn't a Mbenz.

Originally Posted by LtNoogie

I think you just fell for one of ddongbap's troll messages.

It doesn't take alot more hp before you do not feel the affect of the A/C. I don't feel the loss of power with A/C in my Jeep and it only has 210 hp.

Normally I troll, but I'm speaking truth right now.

[cali yaris]

Lafiro, what "engine load" are you scanning exactly?

is this from the OBDII?

[Lafiro]

Originally Posted by cali yaris

Lafiro, what "engine load" are you scanning exactly?

is this from the OBDII?

Hey!

Yes this was with some scanner with a live graph that I borrowed from my friends shop one day to play around with.

But its pretty accurate, I mean I know its just a computer, but when the A?C is ACTIVE I know for a fact that amount of HP is gone because engine load reaches 100% faster, and pressing the pedal faster ot harder to the floor didnt make it faster when it was on. The feeling of lost power was very obvious. And this was done on the same level long stretch of a driveway, so hills have nothing to do with what I felt + the scanner results displayed via OBDII.