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Discussion Starter · #1 ·
I have heard a little bit of talk about this, but I am not sure how it looks. Now i have an 81 280zx NA EFI and was thinkin of installing a ram air system, but read up that a cowl induction system is better. Now I am a little unsure of how the system sits, can anybody show me a picture of what their cowl induction system looks like? Thanx

-Emir
 

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i could have sworn that i saw this guy http://www.users.qwest.net/~ndjulie/280zx/Default.htm put a cowl on his 280zx but after looking at it i cant seem to find it again. Anyway check it out if you want its still a nice car. I do remember seeing one and it does look pretty aggresive however Id think that a ram air setup would be more affective than cowl induction because of where the air intake is placed. I remember hearing that cowl induction works well with z's with v8's though.
 

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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!
 

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Re: datdar2, check facts on Ram Air

Tony D is right. If you really do you're homework on the topic, you'll find out that there is no such thing as "ram air" on a street car, for the simple reason that air forced through the a big intake scoop is nothing compared to engine vacuum. Plan your intake design around the concept of "cold air" which is where you'll add horsepower.

On that note, I don't think the cowl area of the Z is such a great place to get cold air because the air is not refreshed as constantly as right in front of the radiator. But that's a another topic for discussion.
 

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Nope, Sean!

Teh cowl is the perfect place to take it as stated in numerous prior posts. You want the coolest, Highest-Pressure source of air to draw from--and that's not out front. There you only get "cool" air, but on a hot day, that "cool" air is as much as 40 degrees hotter than the air at the cowl! And of lower pressure, to boot.
Cowl induction is the best of both worlds: cool, and high pressure.
 

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Discussion Starter · #8 ·
Ok well my 280zx is FI, now if I were to run the cowl induction on my zx, wouldn't that create a huge 180 degree bend in teh piping from the Intake, creating a lower flow area? Tony D has his facts in these posts, as well as many otehrs on the induction and their differences, but I will go with Cowl, but the question is really how to lay it out. From my understand I will cut a huge hole in my fire wall and then run pipng from my cowl to my TB adn AFM. Am I on eh right track, as well this evening I plan to research the archives more. Thanx for all fo the info

-Emir
 

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Well "Emir" I think you should not do a cowl induction on you "ZX" I suggest you rolling you POS 280 ZX to the nearest pick your part and by the way the $7000 american is still on the table from me in sacramento, california.


























































































































































































































































































































































































































P.S. you are so very _______
 

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Here is the site that made that box for the V8... There is more then one design that he has... you can get air from the headlight or front airdam if you want to BTW, the one shown above is designed for an old chevy truck...

http://www.ramairbox.com/

In the old Super Sports what Chevy did with the cowl hood is have a gasket seal the open air pan to the hood and a flap would open when you nailed it to get the air in the pan... After an hour of searching for the whole setup I give up... but here is a link that shows the hood minus the Cowl Induction Flap you get the ideal of how it get air from the out side... The whole setup is like 20 pieces from seals to the vacuum motor and arms that make it work... it stays closed under normal driving to keep out water, put the hammer down and it opens to let fresh air in from the back of the hood...

http://www.goodmarkindustries.com/grphx/GM Car Photos/4033-200-701.jpg

If enough of you SU's people ask ramairbox about a setup, maybe he could design a backwards air cleaner and have a duct that could get air from the cowl grill... ya never know... he claims V8's cut an ET anywhere .2 to .4
 
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