window up or window down?
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I read a magazine article saying the window should be down, to reduce the aerodynamic side-effects. Having the window up is like an open parachute, slowing down the car.
The whole issue is about saving fuel.
But I thought having windows down means switching on air-con which eats up fuel as well?!
So how? -
No windows = no problems at all.
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Nice oneOriginally posted by ditzy:No windows = no problems at all. -
no windows mean more air will come in? wun it screw up the aerodynamics even more??Originally posted by ditzy:No windows = no problems at all. -
A boeing 747 has so many windows, but no one's complaining right?Originally posted by Icemoon:no windows mean more air will come in? wun it screw up the aerodynamics even more?? -
talk cock.Originally posted by ditzy:A boeing 747 has so many windows, but no one's complaining right?
none of the windows open mah. -
That proves windows closed better lor. You cannot say boeing 747 inside no aircon also.Originally posted by Icemoon:talk cock.
none of the windows open mah. -
talk c-o-c-k.Originally posted by ditzy:That proves windows closed better lor. You cannot say boeing 747 inside no aircon also.
not as if 747 has the option of leaving windows open when flying.
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But they can leave their doors open. Do you drive around with your doors open? I don't think so.Originally posted by Icemoon:talk c-o-c-k.
not as if 747 has the option of leaving windows open when flying. -
Above 80km/h windows down acts as a drag. If you're in crusing speed you're already saving fuel so having the air-con on will have not much of an effect.Originally posted by Icemoon:I read a magazine article saying the window should be down, to reduce the aerodynamic side-effects. Having the window up is like an open parachute, slowing down the car.
The whole issue is about saving fuel.
But I thought having windows down means switching on air-con which eats up fuel as well?!
So how?
You're theory is the opposite. Windows up is more aerodynamic than windows down. -
opps .. I didn't know having windows down will slow down the car on the expressway.Originally posted by nullifi3d:Above 80km/h windows down acts as a drag. If you're in crusing speed you're already saving fuel so having the air-con on will have not much of an effect.
You're theory is the opposite. Windows up is more aerodynamic than windows down.
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Originally posted by Icemoon:
Think < 80km/h won't slow your car down but > 80km/h will.
opps .. I didn't know having windows down will slow down the car on the expressway.
So open windows < 80km/h = no problem.
But open windows > 80km/h = big problem.
So which problem you want?? -
I will close window on expressway from now on ..Originally posted by mr sunray:Think < 80km/h won't slow your car down but > 80km/h will.
So open windows < 80km/h = no problem.
But open windows > 80km/h = big problem.
So which problem you want?? -
hmm convertible how? open window + roof.. so slow until like snail on expressway la? aiyo poor convertible.. slower than snail
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Haha, interesting question.
Won't crawl like snail but just have to floor hard on accelerator. -
convertible open up the roof and windows there will be less drag if it is a convertible. For there with roof it will be 80km/h with all windows open and more than that close up all the windows.
Well well, the most you can save a few dollars but will you like to go on a date sweating like a dog... worst ask your date to endure the hot sun with you.... ?? -
winter -40 degrees drive with windows down the best
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It's not a matter of the car slowing down per se. For every car design there is a certain amount of drag. In this cas the matter of having the windows down above 80km/h will create a little more drag but not substantial enough to cause the car to slow down.Originally posted by mr sunray:Think < 80km/h won't slow your car down but > 80km/h will.
So open windows < 80km/h = no problem.
But open windows > 80km/h = big problem.
So which problem you want??
The theory suggests that if you have your windows down at 80km/h or above the drag affects FC.
But i love to have the windows down on the expressways at night because -
1) Its cooling and it gets the odour out of the car
2) With the wind flow increasing in my cabin as my speed increases it is a direct hindrance to prevent me from excessive speeding. -
i wonder if winding down all of the windows + brake
can act as an air brake... -
i think you've mixed up "up" & "down", unless your windows so special, close by winding down.Originally posted by Icemoon:I read a magazine article saying the window should be down, to reduce the aerodynamic side-effects. Having the window up is like an open parachute, slowing down the car.
The whole issue is about saving fuel.
But I thought having windows down means switching on air-con which eats up fuel as well?!
So how?
yes some people switch off air-con to save fuel, so they wind down their windows for ventilation. but this is only applicable for <80km/h, as what the rest have mentioned.
but at >80km/h, this method will backfire. the shape of the car is already aerodynamically designed to minimise drag. having the windows down at high speed will create turbulence at the windows and hence increase drag.
i can't be sure if that is technically accurate but that's the rough idea of it. -
close all window...dun on a/c... cruise @ 80 -90. open front vent. save petrol and at the same time reduce force. juz that a bit warm... but at night... no problem with it.
But if open vent, suay suay got 1 old old lorry let u smell smoke.. lolz.. -
Mythbusters took 2 identical cars to a race track and brimmed them with fuel for an endurance race. One car had the windows wound down (with the air-con off) and it lasted a few laps longer than the one which was sealed but had the air-con running.
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The cars were identical, but was their mileage identical?
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inconsistent driving styles during the test would also affect the FC numbers no?
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Wow, if this is true, we can save fuel two ways. Wind down the window and last longer distance and you switch off the aircon which also save the fuel.Originally posted by Kuali Baba:Mythbusters took 2 identical cars to a race track and brimmed them with fuel for an endurance race. One car had the windows wound down (with the air-con off) and it lasted a few laps longer than the one which was sealed but had the air-con running.
But really so good or not, i don't know.