Quote:
Originally Posted by Luv2Box
I didn't say "every one has failed." Racing cars are a different breed than our every day use Boxsters and the air dam that is designed specifically for our Boxsters works as it was designed to work. Unless the manufacturer of the after market spoiler has some form of testing documentation (which I have yet to see as I was once interested in this spoiler) one stands at risk to lose control at higher speeds. I wouldn't want to risk losing control of my Boxster on a highway, would you?  |
i wouldn't put too much faith in Porsche aero. look at the airflow through the front bumper cover - it takes the air hitting the three rads and directs it downwards. it actually creates front end lift that increases with speed. uncertain if it was lazy engineering or purposely designed understeer. they fixed it in the 9x7 series (and the 996 gt2/gt3).
it also introduces air under the car. once you have air under the car then you get bernoilli effect (the air traveling over the car and under the car have to get to the back at the same time - the air traveling over the car has to travel a curve vs the straight line under the car so has a longer distance to go - as a result it has to accelerate - this creates a pressure differential between the top and bottom of the car that lifts the car). this lift gets reduced by putting an air dam on the back that disrupts the airflow over the car. caymans have a more aggressive front spoiler and no third radiator so less air under the car, they don't need an air dam and get a wing to create down force instead.
so, really, aero should be done as a package, but given how jacked-up the front airflow is on our cars, I don't think a rear air dam vs wing is going to be a deciding factor in losing control at hwy speeds.