|
mine is similar to insites (second from bottom) but using a larger airbox (his is 70 mm output, mine 85 mm) and some different ducting; i'll get photos up in a bit.
i really like the cayman intake (last one) and think it is the simplest and cheapest to diy; as per my other posts about that approach, however, i am concerned about performance in the wet. i'd love to hear from someone who drove it through torrential rain and reported on the results.
the reduced air temps with the kokeln ram air duct boggle my mind. temp reduction can't be due to the ram air effect as you need to be going really fast before the speed of your car is pushing more air in there than the engine can suck (192 liters per sec. assume the ram air duct cross-sectional area is 2 cm x 10 cm = 20 square cms. 1 liter = 1000 cubic cms, so 192 liters/sec = 192,000 cubic cms/sec. divide by 20 square cms and you get a column of air 9,600 cms/sec long = 96 meters/sec = 215 mph before you are ramming any air in).
what i *think* might be going on is:
- porsche put the intake at a high pressure area on the side of the car.
- wheel wells tend to create high pressure areas at the top of the wheel well.
- car aerodynamics try to cause a negative pressure (suction) underneath the car to keep it stuck to the road.
- hot engine air is getting drawn out of the engine compartment by the suction, into the wheel wells and out the top into the intake.
- the koleln unit, given that it is directional, draws air from further forward on the car and, as a result, gets cooler air.
if that is what is going on then that is a very valid product. food for thought (too bad they are so goddamn expensive).
|