hahaha did someone say "Ram Air?" Sorry when this comes up I just have to chime in. Here's a bit of a revelant article.
"...the fact that Ram Air is a valid idea can't be disputed, after all that's what makes a ram jet work. There is a problem when it comes to cars though, and that is one of speed. Ram jets work best at Mach 2 and faster. That's about 1400 miles per hour and upwards. While some ram jets have
been made to operate (very poorly) at speeds as low as 100 mph, the extensive tests that NACA did in 1948 provided both the math and the test results to show that the Ram Air effect is nearly useless below about 320 mph. It seems that Ram Air is a dynamic function that is proportional to the square of the air velocity. As such, at 75 mph the gain in air density is about 7/10ths of one percent, or .007 percent. At sea level you'll be getting 14.8 PSI instead of the standard 14.7 PSI. But that's in a perfect world. Ram Air is generally considered to be only about 75% efficient, so in truth at
75mph you are gaining only about 1/2 of one percent. This begins to ramp up as you get faster. At 150 mph the density increase is 2.75% (2.06% adjusted) which is probably helpful in some way but is still in the "nearly impossible to measure" category. At 350 mph the increase in density is in the 15% range and this is where Ram Air becomes usable. So unfortunately at normal highway speeds and even at drag strip speeds, Ram Air just doesn't add anything to the performance of your car."
Next time you decide to revv your FJ up to 350MPH give me a call and I'll come watch your ram air in action. :cheers:
