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Old 13th July 2007, 16:06   #1
JamesInLV
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Evosport Pulley in High Temperature Climates

Now that we're in the heat of summer in the northern hemisphere, would anybody who lives in high temperature climates comment on the reduction in A/C cooling in their car? I know RKN in AbuDhabi had to uninstall his, that it just couldn't hold up to hit temperatures there. Is there anyone in Arizona or Las Vegas with this...or another area with high temperatures but generally low humidity, that has noticed issues with A/C cooling? Darren_dallas...you're in a relatively high temperature, high humidity area. Have you noticed any noticeable cooling loss?

For RKN...he is probably at the extreme. Very high temperatures and 80% humidity is torture on an A/C system...humidity is not A/C's friend. Las Vegas has been as high as 116 or 117 in the past couple weeks, and as the pulley kit is on its way I'm concerned about the A/C performance suffering more than I can accept. Probably should have asked this question before I ordered it!
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Old 13th July 2007, 16:12   #2
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I hope there is no reduction, I LOVE THE A/C in our car! It's awesome!

My wife went to test drive Lexus models and it was 109 degrees outside. Every car we drove was still stifling hot after 10-15 minute test drives. The saleman was telling us that Japanese A/C is the best, there is none better. My wife looked at each other and rolled our eyes (we both drive BMWs). I so wanted to put the salesman in the M5 and show him the A/C we were used to, just to get him to shut up!

Japanese A/C being the best...I have found none better than German engineering!

Good luck with the pulley - if you do get it, can you get a before/after dyno? I know you have several mods already on your car, but would be curious to see.

Best of luck!
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Old 13th July 2007, 16:31   #3
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Quote:
Originally Posted by SCORPIO View Post
Good luck with the pulley - if you do get it, can you get a before/after dyno? I know you have several mods already on your car, but would be curious to see.

Best of luck!
I'm curious to see too. If I get it done with for the pulley kit, I would probably go ahead and do a before/after on the K&N air intakes too. Doesn't take long to swap the air boxes, drive a couple miles to ensure the engine reads the intakes (and warm up the tranny again), and drop the car on the dyno. Anybody know a dyno shop in Las Vegas? If not to pricey, I'll get it done.

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Old 13th July 2007, 17:07   #4
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kuwait

I am not so sure about the humidity being an A/C's enemy. I have noticed that most car'ACs cool quicker in humid weather because it helps keep the condenser wet.

anyway,I live in kuwait where it regulary hits 130 fahrenheit but the humidity is relatively mild and have had no issues with cooling. I have had the evosport pulley for the last two months in this searing heat.
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Old 13th July 2007, 17:14   #5
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Quote:
Originally Posted by kaninja99 View Post
I am not so sure about the humidity being an A/C's enemy. I have noticed that most car'ACs cool quicker in humid weather because it helps keep the condenser wet.

anyway,I live in kuwait where it regulary hits 130 fahrenheit but the humidity is relatively mild and have had no issues with cooling. I have had the evosport pulley for the last two months in this searing heat.
YOU are absolutely correct. In fact--humidity is your friend. Humidity IMPROVES engine performance and effectiveness of almost everything having to do with auto performance including AC. High humidity is a common misperception of a reduction of performance. The only thing that will reduce the performance of a car is a high density altitude (heat/altitude) Since humidity is often accompanied by high temperatures, it's often associated with poor engine performance--on the contrary. Water injection (humidity) was a poor man's nitrous system in the early years. It was often used on combat aircraft of WWII and even race cars. I repeat--humidity is GOOD-HEAT=BAD, HIGH ALTITUDE=BAD.

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Old 13th July 2007, 17:32   #6
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Moist air into the condenser helps to pull heat out of the system quicker - we're dealing with an air over tube/fin heat exchanger. It's the same premise as people spraying water over their intercooler on turbo vehicles.

Also, driving the compressor slower will not necessarily make it last longer. It'll be easier on it short term, but it'll be running more frequently. You'll have refridgerant passing through the evaporator slower, thus less cooling capacity (heat removal capacity) for your AC air blowing over its coil (heat exchanger).

Welcome to Thermo and Heat Transfer 101! Crud - I'm actually really enjoying this.
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Old 13th July 2007, 17:36   #7
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Learn something new every day. Always thought since A/C's work to remove water from the air, that humidity made the system work harder.

kaninja99, thanks for posting your reply! Your experience with the extremes of your climate is enough to eliminate my worries.
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Old 13th July 2007, 18:31   #8
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good thread James

well in my case i thing its the opposite from all of you , ill probably re-install in the winter and c the outcome ,
is it havin my ECU programmed by DMS diminished the effect of the pulley?!

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Old 13th July 2007, 18:33   #9
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In miami, had it for at least 3 months and no problems. Sometimes if your hard on the car it'll raise the temp a bit but not a big deal.

Go for it!
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Old 13th July 2007, 20:40   #10
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Quote:
Originally Posted by RKN View Post
good thread James

well in my case i thing its the opposite from all of you , ill probably re-install in the winter and c the outcome ,
is it havin my ECU programmed by DMS diminished the effect of the pulley?!

RKN
RKN, you do know you can go into your iDrive and tell you climate control to be more biased towards cooling vs heating, don't you? I had my car 6 months before I discovered this odd little feature of the climate control.
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