Susky said:What if I put the top down and run the A/C on max?
Sounds like you'll get the mileage of a 1,000 pound fat man sitting in your car making your engine tow that load
air conditioning / fuel consumption
- Thread starter Seraphitia102
- Start date
Sounds like you'll get the mileage of a 1,000 pound fat man sitting in your car making your engine tow that load
the98stang said:WRONG
They proved on mythbusters that you get better mileage with the windows rolled DOWN versus using the AC.
I think it really all depends on the vehicle.
Mythbusters isn't really using brand new high-tech vehicles in their comparision. They use whatever POS they find laying around.
Drag isn't the same for each vehicle as well. Windows up with the A/C on still in a C6 vette is a lot different than in a pick-up truck.
svttech76 said:
True the A/C works less dropping the temp of cooler air, but no matter what temp the air is, the bottom line is the compressor is still on.
How efficient the A/C is at what settings and what temp air and humidity can be drawn out for pages. Her main question was is there a fuel difference between the fan on 2 vs on 4. In either position, the compressor is still engaged so fuel use is the same.
As far as i know, the only input in the Mustang's A/C system is a low pressure cutout switch. I'm not sure if there is a high-pressure switch. I don't beleive there is any other monitoring of the temp of the evaporator in the Mustang
Susky
New Member
Seraphitia102 said:Sounds like you'll get the mileage of a 1,000 pound fat man sitting in your car making your engine tow that load
How'd you know how much I weigh?
the98stang said:WRONG
They proved on mythbusters that you get better mileage with the windows rolled DOWN versus using the AC.
really? I am going to have to see this mythbusters episode myself. when I have tested on cars at work using the WDS instant fuel mileage test I find I get slightly better mileage with the A/C on and windows up. The best possible mileage is A/C off and windows up..
Maybe on certain model cars the A/C compressor dogs the motor enough to cause you to be at a greater engine load with the windows up a/c on than with the windows down a/c off.
Cantslowdown
New Member
Cantslowdown said:
Yeah I agree. I have seen it myself. I have also used that WDS/IDS test to show customers how it's their crappy driving thats causing them to get 9 MPG on the highway on a car that I can show them I get 20 with..
jstreet0204
Active Member
svttech76 said:
It depends on the car, they were using an expedition, probably a 4.6 which was probably already under powered for the weight of the car.
Mustang5L5 said:
Thanks for answering my question in regards to fuel use
Perhaps I should just leave my A/C setting on notch 3. Does the electrical system have anything to do with A/C? Like will having 2 amplifiers hooked up affect my A/C and my car electronic's stability? I remember my old Toyota stalled when I had my stereo on (with 1 amp/no capacitor), A/C, windshield wipers going and headlights on.
Seraphitia102 said:Thanks for answering my question in regards to fuel use
Does the electrical system have anything to do with A/C? Like will having 2 amplifiers hooked up affect my A/C and my car electronic's stability? I remember my old Toyota stalled when I had my stereo on (with 1 amp/no capacitor), A/C, windshield wipers going and headlights on.
Well the biggest A/C electrical draw is the fan motor. The higher the setting the more juice it draws. The A/C also uses some power to engage the magnetic clutch.
Maybe you might want to think about a smaller supplimental battery along with the cap for the stereo if you are going to have that big of a system.
That's some car you are putting together there. Nice to see you doing it very tastefully as well.
CRZYHRSGT
New Member
The Mythbusters in question:
These tests were done in equal Explorers with equal weight. Kinda surprised me...
These tests were done in equal Explorers with equal weight. Kinda surprised me...
Dusstbuster
I love meat more than anything! I just have a spec
Yeah it is because the computer measures your MPG at like optimal efficiency or something like that so it can't properly correct your mileage when AC is on vs when it isnt. The mythbusters show proved in an actual driving test with 2 similar vehicles (even though every vehicle will be slightly different no matter what year/make/model/plant it came from, in terms of fuel consumption, total resistance/drag, etc) that AC burns more fuel than windows down.
Now after watching MANY mythbusters episodes I can tell you that some of their methods of testing these myths are sketchy at best, you don't necessarily want to take this for 100% pure truth. I can tell from personal experience that I go through a LOT more gas when i use the AC regularly vs toughing it out and driving windows down though.
Now after watching MANY mythbusters episodes I can tell you that some of their methods of testing these myths are sketchy at best, you don't necessarily want to take this for 100% pure truth. I can tell from personal experience that I go through a LOT more gas when i use the AC regularly vs toughing it out and driving windows down though.
CRZYHRSGT
New Member
Personally, I don't like my windows down 'cause I can't hear my exhaust as well.....that's worth the couple mpg I might loose
Mustang5L5 said:Well the biggest A/C electrical draw is the fan motor. The higher the setting the more juice it draws. The A/C also uses some power to engage the magnetic clutch.
Maybe you might want to think about a smaller supplimental battery along with the cap for the stereo if you are going to have that big of a system.
That's some car you are putting together there. Nice to see you doing it very tastefully as well.
Thanks for your compliments
I'm planning on putting my 2 amplifiers on my Saleen rear seat delete that's coming soon with the capacitor in the middle kinda like a NOS bottle View attachment 447190
Dusstbuster said:
the WDS/IDS fuel economy test is calculated from how much fuel the injectors are injecting into the motor vs. the veicle speed the PCM sees.. It is HIGHLY accurate.. Ford has us use this test for veicle diagnostics.. I am not talking about the fuel meter on the dash.. I am talking about a scan tool test we have.
think about it. how can this test be innaccurate.. The PCM has to know EXACTLY what the injector flow rate is. It also has to know EXACTLY what the injector pulsewidth is.. and it HAS to know exactly what the veicle speed is, not only for engine management but for ABS and IVD operation..
This mythbusters computer simulation must have not been done using our scan tools. Our test is not innacurate if it was ford would have not included it in our diagnostic equipment. Inaccurate equipment costs them money in fasle warrenty repairs
And the what car ran out first test is not very accurate. the only way that could be accurate is if both trucks had the EXACT amount of fuel in the tank.. ( ford fuel guages read empty when there is 3-4 gallons in the tank, even if you run them out of gas you will see some fuel in the baffles, and on different cars even of the same model this amount of gas can differ)
you would have to install new fuel tanks and pumps in both trucks. This is the only way you can make sure they both have the same amount of fuel..
Plus if they had humans drive it this is even more innacurate. no two humans drive the same.. even with the cruise control on the way one guy turns compared to another can effect the mileage..
I really need to see this episode so I can see how they did it... one major thing I need to know is what method they used when they had the computer figure out the mileage.
BTW one last thing.. 45 MPH is too slow to test at.. nobody drives around the highway at 45 mph.. you need to run the tests at 65-75.. the wind resistance at those speeds is much greater than at 45.
