Quote:
Originally Posted by Vman455
Road testing; who needs it? And fuel economy testing; better to just believe that something works. Why test mods at all? Faith is all you need apparently.
The big thing on Priuschat these days is a VVT solenoid called the "Red Bullet." Many users have installed one on their cars and made ridiculous claims, such as one person who insists that it improved his fuel economy by 15 mpg. Yet no one who has installed one can explain what it does, not even the person selling them; they can't even be bothered to look up the (Toyota-available and published online) solenoid schematic and apply a little thought, let alone do a controlled test.
Oh, you mean like this?
Hey, wait a minute! That shows flow detachment just like the Porsche! It's almost as if the flow over most of the car is turbulent and the streamlines are subject to random high-frequency fluctuation that isn't captured by a single still photograph. No, that couldn't be.... |
That photo was likely taken at an airspeed below 20-mph. It would be at sub-critical Reynolds number. You should have recognized it immediately. Not germane.
There's another image produced at supercritical Rn, necessary for the development of a proper turbulent boundary layer.
Is this just an innocent undersight or deliberate obfuscation? Conformation bias?