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Old 10-20-2004, 08:27 AM   #1
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A/C on = no power?

I had to turn on the A/C again yesterday after driving the last two weeks with it off and I forgot how much power it sucks up. I was setting at a light and needed to get over a lane when it turned green. To due this I had to launch the car at about 2200 rpms just to get going quickly with out it bogging. Is this normal? I can launch the car at 1200rpms with no problem w/A/C on but this does not result in a quick start what so ever. With the A/C on what rpm do you have to launch the car to result in a quick start? Not tire spinning just faster then normal.


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Old 10-20-2004, 08:33 AM   #2
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that sucks, in my (non svt) i need to take off probably aound 1700.

are u on max ac? thats crazy talk
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Old 10-20-2004, 10:09 AM   #3
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It's completely normal for my SVT, and it sucks. I even had it in the shop (a non-SVT certified Ford dealership) and they were going to replace a handful of parts on the car to "fix" the problem. Turns out, it's a common condition for the SVT. There's a thread in the SVT forum about the SVT Diablo Predator - SVT Diablo Predator READY . From the description of that awesome-sounding thing, it sounds like it might improve the bog quite a bit.
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Old 10-20-2004, 05:03 PM   #4
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Yeah, thats perfectly normal man. I have to get between 2000 - 2200 to get a quick takeoff with bogging down. Its not just the takeoff though...my svtf hits the power band around 3500ish with the ac off and just lunges but with the ac on it lags all the way through. I test drove my car before I bought it, in 110 degree weather (Phoenix), and was not at all impressed with the power, but I was quite happy when I was able to start leaving the ac off a few weeks later...totally different car.
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Old 10-20-2004, 05:28 PM   #5
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It's going to be that way for just about any car with a small(ish) four cylinder engine, the A/C compressor sucks up a lot of power and four cylinder cars don't have a lot of power to spare.
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Old 10-20-2004, 06:01 PM   #6
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So am I driving my car wrong when I say that I don't notice any bog? On my previous Hondas, I could actually feel a dip in the RPMs whenever I turned on the A/C. With my Focus, I don't feel anything...the engine just makes a little more noise.

Past two Hondas were an '02 Civic SI and then an '03 Accord Coupe.
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Old 10-20-2004, 06:03 PM   #7
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They're talking about from a take-off. Once you're already moving and cruising the A/C won't make much difference in your ability to continue cruising, it's the getting moving part that is where the Focus bogs down.
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Old 10-20-2004, 06:04 PM   #8
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On most small Fords, there is a cutout switch. When you drive with the throttle wide open, it shuts the A/C off. The only problem is you don't get airconditioning if you drive with the throttle wide open all of the time.
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Old 10-20-2004, 06:09 PM   #9
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Yes. And the reason why is four cylinder engines can't provide enough power to get good full-throttle acceleration that would be acceptable to the customer AND continue to power the A/C compressor. My MR2 either did not have a cutout switch or it was broken, either way - it was dog-slow with the air on, and any time I wanted to nail it I had to reach down and push the button to turn off the A/C. I had to do that so much I'm actually still in that habit and do it on the Focus.
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Old 10-20-2004, 06:11 PM   #10
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Quote:
Originally posted by d3bilhan
On most small Fords, there is a cutout switch. When you drive with the throttle wide open, it shuts the A/C off. The only problem is you don't get airconditioning if you drive with the throttle wide open all of the time.
This I have felt first hand... I had heard of it before I got my Focus and when it happened for the first time I went "That's an awesome feature." Of course, the A/C started blowing hot air and I slowed down my fun in exhange for cold, cold, A/C love.
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