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Old 05-15-2013, 10:00 PM   #4276
ST Eye
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Originally Posted by jsteg View Post
You can think all you want, that is wrong. All the fan (blower motor) does is move the cold air from the evaporator, through the ducts and into the cabin. It has nothing to do with how often the compressor cycles. But sure, don't take my word for it, (by the way, I am ASE certified and a certified refrigerant handler) go ask your Subie tech!
Hey I'm not saying I'm right, this is just my understanding. I'll touch base with him to figure this out because I'm all for saving fuel if possible.
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Old 05-15-2013, 10:31 PM   #4277
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Like I said. All you have to do to prove either of us wrong or right is go sit in your driveway for a few minutes and turn your fan on 4 and 1 with the AC on. If I'm right, the average time between on/off cycles should be significantly lower.

If you don't want to, then I guess this'll be our little Schrodinger's cat.

I'd do it but gas is ****ing $4.20 here so not right now. Maybe when it goes back down to 1.40 a gallon.
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Old 05-15-2013, 11:41 PM   #4278
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Originally Posted by goregasm View Post
Like I said. All you have to do to prove either of us wrong or right is go sit in your driveway for a few minutes and turn your fan on 4 and 1 with the AC on. If I'm right, the average time between on/off cycles should be significantly lower.

If you don't want to, then I guess this'll be our little Schrodinger's cat.

I'd do it but gas is ****ing $4.20 here so not right now. Maybe when it goes back down to 1.40 a gallon.
No...why don't you use actual facts instead of goofy experiments that have nothing to do with how the system operates. Your explanation will not prove anything. I can leave the fan on it's highest setting and by simply blocking airflow to the condenser cause the AC to cycle more or less. Your theory proves nothing! I gave you facts, you just choose to not believe them. Why don't you provide me with some facts proving your theory is correct?!?!
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Old 05-16-2013, 01:14 AM   #4279
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so.... 26 mpg (9.1 l/100km) for me over 10,000km commuting in a hilly city.

Couple highway trips have yielded tanks of 32 through mountain-y terrain.

i have seen as good as 39 for shorter periods on flat highway but there's only about 100km/60miles of that before i hit mountains
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Old 05-16-2013, 03:09 AM   #4280
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so.... 26 mpg (9.1 l/100km) for me over 10,000km commuting in a hilly city.

Couple highway trips have yielded tanks of 32 through mountain-y terrain.

i have seen as good as 39 for shorter periods on flat highway but there's only about 100km/60miles of that before i hit mountains
Good ol' Lower Mainland.

I'll assume that you don't need to fight with the traffic trying to find their way to Downtown Vancouver as part of your regular commute. I'm currently in the high- to mid-8's on recent tanks (running 91 octane in the tank now too; I swear my engine sounds almost silent while idling) commuting through the north-south **** between Richmond and Vancouver, but I also purposely take it on the 99 and 91 late at night to give it some highway lovin' time. Fast heading towards 16k kms (ie. 10k miles), and overall fuel consumption (including a trip to the Island) is at around 9.3 l/100 km.
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Old 05-17-2013, 03:26 AM   #4281
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Originally Posted by jsteg View Post
This will illustrate my point. Explain to me how spinning the blower motor makes the AC cycle faster or slower.

You forgot the little thermostat on the evaporator coil that keeps it from freezing up - when not as much air is flowing through that evaporator it cools down more so the thermostat cuts if off more of the time to avoid ice buildup. That would be when the fan is on low...

http://www.docs.hvacpartners.com/idc...ag-aaft-02.pdf
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Old 05-17-2013, 10:10 AM   #4282
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You forgot the little thermostat on the evaporator coil that keeps it from freezing up - when not as much air is flowing through that evaporator it cools down more so the thermostat cuts if off more of the time to avoid ice buildup. That would be when the fan is on low...

http://www.docs.hvacpartners.com/idc...ag-aaft-02.pdf
First of all I didn't make that picture so I didn't forget anything. Second, we're talking about cars here not home units. There is no thermostat on the evaporator in our cars!
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Old 05-17-2013, 11:46 AM   #4283
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Good ol' Lower Mainland.

I'll assume that you don't need to fight with the traffic trying to find their way to Downtown Vancouver as part of your regular commute. I'm currently in the high- to mid-8's on recent tanks (running 91 octane in the tank now too; I swear my engine sounds almost silent while idling) commuting through the north-south **** between Richmond and Vancouver, but I also purposely take it on the 99 and 91 late at night to give it some highway lovin' time. Fast heading towards 16k kms (ie. 10k miles), and overall fuel consumption (including a trip to the Island) is at around 9.3 l/100 km.
Haha no downtown for me. New west to coquitlam and back, against the normal flow too.

91 octane is a little rich for my blood haha 87 all the way.

best tank so far is hope to penticton and back 7.3l/100km. But that was during break-in, so should be better next time
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Old 05-17-2013, 06:07 PM   #4284
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Originally Posted by FunkMasta View Post
Haha no downtown for me. New west to coquitlam and back, against the normal flow too.

91 octane is a little rich for my blood haha 87 all the way.

best tank so far is hope to penticton and back 7.3l/100km. But that was during break-in, so should be better next time
That's a nice little commute. I wish mine were so easy.

I thought 91 was a little too rich for me as well - and then the low(er) ethanol content inherent in the 91 sold me on it. I'm almost certain that my car idles more quietly, is more responsive when stepping on it, and sips a little less quickly than when it was on 87 or 89. I have no hard figures to prove any of this, though; just fuel consumption stats that involved 87 during break-in, 89 during the tail end of break-in, and 91 since breaking it in.
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Old 05-18-2013, 02:50 PM   #4285
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Hey I'm not saying I'm right, this is just my understanding. I'll touch base with him to figure this out because I'm all for saving fuel if possible.
Have you checked with him yet?
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Old 05-18-2013, 03:30 PM   #4286
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First of all I didn't make that picture so I didn't forget anything. Second, we're talking about cars here not home units. There is no thermostat on the evaporator in our cars!
Well I doubt if AC units waste energy these days, and the fact is the higher the fan speed the more heat energy is being taken out of the air by the evaporator so the more work is being done compressing the coolant back to a liquid. So, check that with your local AC Engineer...
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Old 05-18-2013, 03:56 PM   #4287
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Originally Posted by lymphomaniac View Post

That's a nice little commute. I wish mine were so easy.

I thought 91 was a little too rich for me as well - and then the low(er) ethanol content inherent in the 91 sold me on it. I'm almost certain that my car idles more quietly, is more responsive when stepping on it, and sips a little less quickly than when it was on 87 or 89. I have no hard figures to prove any of this, though; just fuel consumption stats that involved 87 during break-in, 89 during the tail end of break-in, and 91 since breaking it in.
My car got better mpg on 91 than 87 (both no ethanol) but it didn't get the required 10% better to offset the higher fuel cost
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Old 05-18-2013, 04:22 PM   #4288
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Have you checked with him yet?
I just got off the phone with him ironically. Here is what he says: Having the fan on the LOW setting does in fact consume less fuel than the HIGH setting. This is because there is a temperature sensor on the evaporator. When you blast the air conditioner the sensor never gets cold enough to turn off the compressor, thus the compressor works at a longer interval (if it even turns off) than it would if you ran the A/C on low. On the flip side, if you run the A/C on low, the evaporator will get cold enough and allow the compressor to shut off and stay off at a longer interval.

I am not nearly as knowledgeable about cars as him (obviously, he is a mechanic), but I figured there had to been some cost involved in more cooling.
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Old 05-19-2013, 11:51 PM   #4289
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This is pulled from my 2008 Impreza Service Manual:



The magnetic clutch it is referring to is the compressor clutch.
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Old 05-20-2013, 09:43 AM   #4290
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Summer mpg.

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Old 05-20-2013, 10:12 AM   #4291
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Nce, how many miles were you driving for?

323 is that it?
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Old 05-20-2013, 12:45 PM   #4292
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Nce, how many miles were you driving for?

323 is that it?

looks like it
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Old 05-20-2013, 01:37 PM   #4293
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Summer mpg.

that's awesome! what is the average speed reported on the computer and what was your driving like?
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Old 05-20-2013, 01:54 PM   #4294
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Stevie is not going to like those numbers.
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Old 05-20-2013, 02:01 PM   #4295
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Nce, how many miles were you driving for?

323 is that it?
Yes and 1/2 tank left as you can see. This was before the weekend so this number went down a bit due to errands around town and such.

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that's awesome! what is the average speed reported on the computer and what was your driving like?
Its usually around 40 mph. I didnt check it.
Mostly rural highway with some lights. About 25% pure highway (light traffic) and 10% city as well.
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Old 05-20-2013, 02:07 PM   #4296
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Stevie is not going to like those numbers.
he will dismiss them because they were not driven at a speed people actually drive
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Old 05-20-2013, 04:20 PM   #4297
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He will dismiss them because they do not comport to his math models.
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Old 05-20-2013, 04:26 PM   #4298
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it is just another tiny bit of unconfirmed anecdotal evidence, unless it confirms what he already believes, then it is mathematical proof that the CVT cannot meet the EPA promises...

Last edited by Zeeper; 05-20-2013 at 04:34 PM.
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Old 05-20-2013, 05:23 PM   #4299
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Unless your driving 75 mph in the mountains your not a "normal driver", c'mon guys what's wrong with you? The other problem lies in the fact that Subaru rates its mpg as the actual number, and not 6 mpg less like he claims all the others do. So I guess if your not an overachiever your a liar. Funny how it doesn't matter anyway, as the regulations demands better fuel milage, they are losing tax revenue. So they are coming back taxing you more because you get better mpg. So pay now, pay later, either way your going to pay. This way I'm paying while having the best awd on the market IMO.
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Old 05-20-2013, 05:27 PM   #4300
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Good lord 323? lol I rarely see that for a full tank

Well done
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