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Old 04-09-2013, 10:49 PM   #1
Krang
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Join Date: Dec 2006
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Location: Kailua, Hawaii
Vehicle:
2002 WRX Wagon - WRB
ej207 v8 vf37

Default How to improve stock AC system?

I have a 97 Tacoma as my work truck, I want the AC system to be as efficient and powerful as possible. What would create the best benefit I the system? Larger condenser? Larger evaporator? Could the expansion valve be altered?

I expect to do some custom work, what makes some AC systems better than others?
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Old 04-10-2013, 07:59 AM   #2
SlowTrackImpreza
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we used reflective heat wrap on the ac lines under the hood of my mothers company trucks, they were all 99 Taco's. made a hell of a difference.

you'll notice there is a line running from the exchanger in the cab to the condenser that is really cold, this is on the after cabin portion of the system....but in insulating this with foam and reflective wrap and keeping the return line cold, it made the supply line that much colder.

also, make sure the fins on the condensor are not all damages, if they are all bent grab a wire brush to straighten them out.


hope this helps


oh, and the AC systems that are better than others will often have line insulation already. or they will have a larger more efficient pump that can compress the refrigerant with less heat....think going from small turbo at 20psi to big turbo....bigger is more efficient and less heat.
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Old 04-10-2013, 12:51 PM   #3
PARANOID56
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interesting, i might have to try that with my tacoma too.
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Old 04-12-2013, 12:29 AM   #4
Krang
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2002 WRX Wagon - WRB
ej207 v8 vf37

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Hell yeah that's what I'm talkin about! Easy to do too. Il give it a shot.

Anyone happen to know if the compressor on the 6cyl is bigger than the 4cyl? Or if they are interchangeable?
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Old 07-30-2013, 03:11 PM   #5
Kurbstomp44
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Quote:
Originally Posted by Krang View Post
Hell yeah that's what I'm talkin about! Easy to do too. Il give it a shot.

Anyone happen to know if the compressor on the 6cyl is bigger than the 4cyl? Or if they are interchangeable?
Not sure if any are larger or smaller due to engine size, what typically matters is the cabin space, If it's a crew cab it may have a compressor that is rated for higher pressure, and have a larger evaporator to cool the amount of extra cfm needed, which is never enough to really be noticed.
My guess is they would be the same on all similar models, 4cyl, v6, v8 ect.

Car makers ask for smaller and smaller compressors to save weight and keep efficiency, so to think a larger compressor is more efficient is now no longer the case due to scroll design compressor, which use 30% less energy to convert hot gas to cold compared to the hermetic design.

Basically the only way to gain efficiency now is to insulate your lines, clean your grounds, and weatherize the cabin.

I'm an HVAC sales engineer so I deal with this stuff every day
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Old 09-13-2013, 10:41 PM   #6
MARC3
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ALSO HAVING A CLEAN CONDENSOR ANd if you dont have a cabin filter, give a cleaning to the evaporator. Not an easy job seeing its deep Under the dash..but will help.
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Old 10-25-2013, 01:07 PM   #7
TXwrxWagon
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WRB not so minty fresh

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on both my WRX Wagon and the Wife's Dodge Magnum, the cabin filter spaces were empty. I added filters to both after cleaning tons of crap out of the HVAC box. Especially with the cramped engine bay of the Hemi, I used foam insulation wrapped in reflective foil, cleaned the condenser and straightened a bunch of fins, at lease the ones I could reach.

Lastly I topped off the system with an A/C Pro Cold from Autozone/O'reilly Auto.. you can find the video @ acprocold.com

those really brought the Magnum even with the WRX in terms of cooling efficiency.

On both I created radiator fillers to channel as much air through the condenser and radiator as possible.

I am going to install an aftermarket fan control on both cars and override the idle/cruise fan shut down, that is where both fall off is at a stop light. neither blow anywhere close to what you would want on even a moderate day.

Good luck.

Rob
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