Aerodynamics
Door visors help and are popular with FitFreaks. At higher speeds fuel economy is better with the windows up and the AC on. At lower speeds, the best fuel economy is with the windows down and the AC in the off position.
The take away message here is that wind tunnel tests conducted by Honda are carried out with the windows up. The car was meant to be driven with the windows up.
If you only have one window open then you will experience a known aerodynamic effect called cavity resonance. It is also a problem for aircraft with landing gear bays and bomb bays. The air passing over the open window forces the cavity, in this case your car interior to resonate. Just like blowing across the top of a bottle.
The easiest way to stop that resonance, other than closing the window, is to crack the opposite front window...
This happens in every vehicle but some have it more pronounced. I would say the Fit is no worse then any other car out there!
There are several types of door visors available to purchase from a variety of sources.
The take away message here is that wind tunnel tests conducted by Honda are carried out with the windows up. The car was meant to be driven with the windows up.
If you only have one window open then you will experience a known aerodynamic effect called cavity resonance. It is also a problem for aircraft with landing gear bays and bomb bays. The air passing over the open window forces the cavity, in this case your car interior to resonate. Just like blowing across the top of a bottle.
The easiest way to stop that resonance, other than closing the window, is to crack the opposite front window...
This happens in every vehicle but some have it more pronounced. I would say the Fit is no worse then any other car out there!
There are several types of door visors available to purchase from a variety of sources.
Cavity Flow Physics
Member
Joined: Nov 2008
Posts: 561
From: Illinois
We recently suffered a total loss of the blower fan during a long trip on a very hot (107°F) day (https://www.fitfreak.net/forums/2nd-...igh-speed.html).
We tried every combination of open or partially open windows. It was like a walk through a hurricane. Since the A/C compressor would still run, I tested the theory that by cracking some combination of windows the airflow would pull enough outside air into the car through the ductwork to at least cool it a little. It was like riding in some kid's car that's all speaker with the sound turned up. We never did find a tolerable noise level with windows open at all—and not much cool air sucked through the ducts, either, for that matter.
Cheers.
We tried every combination of open or partially open windows. It was like a walk through a hurricane. Since the A/C compressor would still run, I tested the theory that by cracking some combination of windows the airflow would pull enough outside air into the car through the ductwork to at least cool it a little. It was like riding in some kid's car that's all speaker with the sound turned up. We never did find a tolerable noise level with windows open at all—and not much cool air sucked through the ducts, either, for that matter.
Cheers.
We recently suffered a total loss of the blower fan during a long trip on a very hot (107°F) day (https://www.fitfreak.net/forums/2nd-...igh-speed.html).
We tried every combination of open or partially open windows. It was like a walk through a hurricane. Since the A/C compressor would still run, I tested the theory that by cracking some combination of windows the airflow would pull enough outside air into the car through the ductwork to at least cool it a little. It was like riding in some kid's car that's all speaker with the sound turned up. We never did find a tolerable noise level with windows open at all—and not much cool air sucked through the ducts, either, for that matter.
Cheers.
We tried every combination of open or partially open windows. It was like a walk through a hurricane. Since the A/C compressor would still run, I tested the theory that by cracking some combination of windows the airflow would pull enough outside air into the car through the ductwork to at least cool it a little. It was like riding in some kid's car that's all speaker with the sound turned up. We never did find a tolerable noise level with windows open at all—and not much cool air sucked through the ducts, either, for that matter.
Cheers.
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