datdar2, check facts on Ram Air
Ram air is most definately not more effective on a street driven car.
Ram Air really doesn't show any appreciable effect other than in marketing hype until speeds above 100mph.
Cowl induction, on the other hand, offers measurable, quantifiable results from s peeds as low as 30mph!
What most manufacturers nowadays call "Ram Air" packages are in reality nothing more than fancystickers amd styling bulges to conceal a very expensive cold-air induction system. Nothing more.
Take a look at some of the posts in the past month on this subject here and over in banter and chat and you will get a much better understanding of why the differences are so pronounced.
Good checking of the archives Stingray! The 280Zx may not offer the opportunity of advantage that the earlier cars did as it's windshield slopes backward more, and it has much improved aerodynamics. I haven't tested the pressure zones on a 280ZX as of yet. I will probably start experiments at ElMirage Next summer if the car is approved and teched in for the class. Otherwise, I will have to get another ZX to drive on the street to check pressure zones and determine optimum placement of the duct. There is a Ram-Air system I may be developing for a 280 ZX, but it most likely will not offer advantages for a street car, as it will be developed to increase turbo inlet pressure at speeds approaching 150+mph.
Current record at Bonneville is 204, and if the rules allow my little device, I will let you all know the results.
You can always map the zones yourself, go pick up a roll of duct tape, some 1/4" tygon Tubing (or Nagalene), a low-pressure Magnahelic gauge that reads 0-22" of water, and some spraycan lids to make static-pressure taps for various places around the body and have at it! R&D, that's all it takes!