01-30-2018, 01:54 PM
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#11 (permalink)
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aero guerrilla
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Quote:
Originally Posted by ASV
the electric clutch on an AC is actually extremely easy to convert for engine braking .... hook the brake light to it
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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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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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01-30-2018, 03:43 PM
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#12 (permalink)
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weirdo
Join Date: Oct 2008
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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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01-24-2019, 03:23 AM
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#13 (permalink)
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Master EcoModder
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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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01-24-2019, 11:22 AM
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#14 (permalink)
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Somewhat crazed
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How about changing refrigerant to something like R410 @ higher pressures? Supposed to be more efficient.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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01-24-2019, 11:39 AM
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#15 (permalink)
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Master EcoModder
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Interesting idea, but i do not know how to do that.
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01-24-2019, 03:59 PM
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#16 (permalink)
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It's all about Diesel
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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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01-25-2019, 05:31 AM
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#17 (permalink)
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Master EcoModder
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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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01-25-2019, 06:07 AM
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#18 (permalink)
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Corporate imperialist
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The best thing by far, a mechanical TXV.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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01-25-2019, 06:15 AM
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#19 (permalink)
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Master EcoModder
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What is that?
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01-25-2019, 06:23 AM
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#20 (permalink)
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Corporate imperialist
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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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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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