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Old 01-30-2018, 01:54 PM   #11 (permalink)
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Quote:
Originally Posted by ASV View Post
the electric clutch on an AC is actually extremely easy to convert for engine braking .... hook the brake light to it
Your brake light goes on only when your foot is on the brake pedal, at which point you are wasting energy as heat. Engine braking is just taking your foot off the gas while in gear, and this should not light brake signal.

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Old 01-30-2018, 03:43 PM   #12 (permalink)
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simply taking your foot off the gas is not effective for engine braking
you have to down shift or provide some form of extra resistance
otherwise your basically just coasting in gear
getting that extra resistance by cooling your cab or charging your battery
is simply smarter and its a little dangerous to engine brake without a brake light
even if your stopped in traffic its better to use your idling engine for something than nothing.
hooking your alternator or AC pump to the brake light allows for a convenient way to harness otherwise wasted energy without burning up your starter
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Old 01-24-2019, 03:23 AM   #13 (permalink)
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Just measured a passat 1.8 tsi

No extensive testing but at a glance i saw that while idling the ecu reports the ac compressor is putting 5Nm of torque on to the engine.
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Old 01-24-2019, 11:22 AM   #14 (permalink)
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How about changing refrigerant to something like R410 @ higher pressures? Supposed to be more efficient.
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Old 01-24-2019, 11:39 AM   #15 (permalink)
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Interesting idea, but i do not know how to do that.
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Old 01-24-2019, 03:59 PM   #16 (permalink)
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How could changing the refrigerant increase the efficiency of an AC system? Assuming it would involve only a refrigerant change instead of an overhaul of the entire system (which would sound more effective for that matter).
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Old 01-25-2019, 05:31 AM   #17 (permalink)
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Higher heat of evaporation?

So one pass of the liquid with phase change removes more heat from the cabin?
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Old 01-25-2019, 06:07 AM   #18 (permalink)
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The best thing by far, a mechanical TXV.
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Old 01-25-2019, 06:15 AM   #19 (permalink)
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What is that?
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Old 01-25-2019, 06:23 AM   #20 (permalink)
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Mechanical thermal expansion valve.
Most autos use a bleed orifice. There really isn't much you can do to improve the efficiency of a fixed orifice system.
For example, a cheap window unit air conditioner, it uses a fixed orifice.
But those window units run the compressor at a fixed speed so they are fairly efficient. Compared to vehicles that are all over the place for rpms.

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