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Old 06-20-2000, 12:33 PM   #1
Skeandhu
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Member#: 1056
Join Date: Mar 2000
Chapter/Region: E. Canada
Location: Ottawa, ON, Canada
Have a Nice Day? air conditioning lag?

Just wondering if anyone else notices this as well...

When driving with A/C on, there is a noticable reduction in the performance. This is to be expected, and is not a problem. However, I find that the reduction in performance is not constant. ie: when driving with the A/C on, and consistant pressure on the accelerator (to maintain constant speed) the car seems to lurch a bit, almost as if I was flicking the A/C on and off.

Some notes on the car: MY00 RS, approx 9000km (less than 6000 miles) on odo.

Is this a common thing or should I be checking with the dealer??

Input greatly appreciated.
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Old 06-20-2000, 12:54 PM   #2
ttoversteer
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Join Date: Oct 1999
Chapter/Region: NESIC
Location: Connecticut
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2012 GTI
Gray

Post

I wouldn't worry. I have a MY99 that does the same thing. The lurching you feel is when the compressor turns itself on and off as it tries to maintain a constant temp.
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Old 06-20-2000, 06:28 PM   #3
Warp3
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Chapter/Region: South East
Location: WNC
Vehicle:
06 WRX TR (SGM)
89 MR2 (Ice Blue)

Post

I've noticed on my 99 2.5RS that it feels like the A/C partially disengages at 3k then moreso at 4k. I'm not sure how it "partially disengages" but I know there is a jump in power at both RPM points even under light throttle (and this doesn't seem to happen with the A/C off at either RPM point). Also I'm pretty sure the A/C disengages at full throttle regardless of RPM (I'm pretty sure all modern cars do that).
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Old 06-21-2000, 01:00 AM   #4
North Ursalia
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Oct 1940 - Feb 2008

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Join Date: Jan 2000
Chapter/Region: NESIC
Location: NH, Land Of Many Trees
Vehicle:
2000 2.5 RS, '14 For
92 5MT SVX

Post

Actually, the AC compressor is designed to shut off under heavy (what SOA calls "emergency acceleration", what we prefer to call "spirited driving"). Just check your users manual, it's in there. I believe it's been on every AC'd subaru since about 88 or 90.
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Old 06-21-2000, 01:24 AM   #5
ColinL
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Join Date: Jul 1999
Chapter/Region: MWSOC
Location: Wichita, KS and Whoring, OT
Vehicle:
'03 Evo, Rice White
'01 Erion CBR 929

Post

I specifically noted that the AC compressor didn't affect RS much when shopping a year and a half ago. Compare to the Civic Si, for instance. (yes it's displacement.)

I'm perfectly happy with the part and WOT performance of my RS running the AC. Well, not perfectly... The car needs another 100HP or so, but it performs nearly normal with the AC on.
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Old 06-21-2000, 01:36 AM   #6
mpaone
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Join Date: Jun 1999
Chapter/Region: South East
Location: Alfretter Geeoja
Vehicle:
2012 Geeteeeye
and 71' VW Gulf Beetle

Question

On a similar subject, do any of you hear a slight "squeak" when the air turns on or off? This has been happening in my 99' lately. I have an underdrive pulley... could it be that the belt needs tightening? I especially hear it when letting off the gas after full throttle (with the air on).
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Old 06-21-2000, 01:51 AM   #7
Matt
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Vehicle:
2009 Forester

Post

You'll probably need to check the belts. And yes, the A/C usually turns off around 4500rpm when accelerating hard, then re-engages at 4000rpm. Of course this is on my 1.8L so it may be different on the 2.5L.
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