Makenzie71

I'm looking into relocating my intake box to the upper passenger side of the engine bay, then building an air-tight box around the filter area and feeding it with a scoop on the hood. But, if the hood is a low-pressure area it won't help because air will not be forced into the intake system.

BlackRx7

there a pic floating around here somw where of the airflow model of an FC....it is semi low pressure.....sorry but I got to say it...the search button does wonders...especially if there has been over 100 post on this subject...

spunks

Why don't you try installing a headlight scoop.Make a cold intake box around the air intake.

projekt

i don't think the headlight would do that much, imo it's kinda rice. if you want ambient air run some ducting to the front of the car. the hood is too long and flat to be that high pressure, which sadly, creates a little lift.

Bebesito21

screw all that nonsense....go all out. Get rid of your pasenger headlight and make that a ram air for your intake system. then get a really bright flashlight and tape it to your hood.

Makenzie71

Blackrx7...I did search and was still seraching when I posted that. I was trying to find that pic that shows the air flow around the car but I couldn't find it and what I did find wasn't anything spectacular enough to answer my questions.

The headlight isn't a high pressure area...it wouldn't force air into the box like I want. I believe I will be stuck with running a duct from the bumper to accomplish my goal.

Thanks

rotard

I think this guy is talking about the upper right side, just below the passenger side window...
I've been thinkin the same thing. Have to move a couple of things, like charcoal filter, and reroute air intake with some fabrication, but it looks cool.

Makenzie71

oh **** yeah!!! Thanks rotard!!! If I'm looking at that pic propperly then where I'm wanting to throw the hood scoop in is a high pressure field. Thanks!

projekt

i guess use the flash to pass hole then. somethign odd about that pic, the rear bumper has high pressure? the whole back end should just be a bunch of tumble...

Evil Aviator

Vector quantites for nubies 101: High pressure is where the arrows point toward the car, while low pressure is where the arrows point away from the car. The length of the arrows show the amount of pressure.

Hehehe, I posted that pic about a year ago. It's nice to see it's still floating around. Sorry about the crummy scan job.

Makenzie71

no....in that pic...if I understand it correctly...the arrows are showing where the air is being forced around the car. That would make the rear of the car justa turbulent low pressure area. Where the arrows are away from the car those are low pressure areas and where they're aimed at the car or high pressure areas.

Evil Aviator

No, the back is a natural spoiler, which you can see by the high pressure zone on the rear deck where a spoiler would normally go. The design is absolutely brilliant.

Makenzie71

sweet! it's cool to be able to look at something like that just know what's going on...lol, I was hoping I was right and who ever knew wouldn't come in and flame me for talking out my ***!

Anyways, do you have any more of these? Like one that shows the flow around a TII hood or one with the sunroof open? Where did you find it? I'd like to try and find a few for another car.

Also, according to that pic, if I place a scoop at the upper pass. side of the hood would it force any amount of air through it at speed?

Cwaters

you could put a little scoop like the 280Z turbos had right up before the winshield....hmmmm
Remember, you don't have to have high pressure as long as you have access to outside air. The engine is sucking the air in, any vent in the hood would suffice. Even louvers. And wouldn't that be cool being able to look down throught the hood into your airbox and see the K&N sitting there right where the stupid cold start resovour was.
Of course then it'd start raining.

projekt

ha ha i must have been in idiot mode when i looked at that pick. that's why miata owners use a cowel induction tube, it runs to the vents near the windshield wipers.
and that natural spoiler is more like the air sliding off the rear glass and smacking into the little lip of the trunk.

Makenzie71

that's what I wanna do...kinda. I want a scoop with just a slight rise above a sealed box. If I can get an actual pressurised box then that'll mean a couple of extra ponies at speed. But, I am worried about the possabillity of it getting wet by rain or something. need to think of a by-pass of some kind...

how do ram-air trans-ams take care of that?

Orange!FD

You realize, of course, that at 100 MPH, you're talking about plus or minus 0.18 PSI as the maximum pressure change you'll see, depending on your choice of location for the intake.

Makenzie71

not if what I want to do works out propperly. I tried a setup before on my MKII Supra, only dif is the intake was mounted up front, and got an average of 2psi before the throttle body at WOT while cruising at 90 in 4th gear. I think it's going to hard to get that kinna pressure increase where I want the scoop...I'm just hoping for in the vacinity of 1lb. That would only translate into about 8hp but it's some gain plus it's always got cold air. If it yields minimal performance results as you say then at least it might look interesting and it will put the MAS much closer to the TB...which I hear can be beneficial.

rotard

There was a thread on this a while ago, but I can't find it. It's a nice straight shot into the intake, and would certainly be just as good as a headlight scoop. Not much resistance to airflow, or time to heat up on the way.
Here's a pic of what buddy did, I think I'll wanna try a bit more fabrication, but it's a cool. He was gonna put a little scoop in and a box. He also had the side plastic off and had filled in the metal. Looked cool.

Makenzie71

Rotard your friend is the ****. That's exactly what I want to do but I'm going to build a thin steel box and tack it into the engine bay...then seal it off with silicone and insulate the box so that the only air going in is cooler outside air.

I also wanted to try and build a strong seal with the hood and try and force a certain amount of air into the intake.

SonicRaT

iTrader: (6)

With all these idea's of fabricationg I'm surprised nobody's mentioned mounting it up front just behind the bumper. I believe that'd yield the best results.

Evil Aviator

I scanned it from one of my old Rotary Rocket Magazines. This web site has all of the pics from the Rotary Rocket Magazine:
http://www.geocities.com/mcgumrapper/aerodynamics

If you mean the newer WS6 ram air, it is not actually sealed. The older ram air Trans Am cars (70 and later?) had a flapper door.
http://home.att.net/~ops32cars/transam24.html

You mean a scoop like this? It will never work.
http://www.toddveney.com/

That sounds about right, and it would equate to somewhere around 2% hp increase/decrease. Ram air makes a bigger difference as the speed increases.

Evil Aviator

http://www.checkpointmotors.net/Gallery.asp?albumID=6

http://www.mazdatrix.com/faqpics/roadrace/ep01123bb.jpg

SonicRaT

iTrader: (6)

Yeah, I knew checkpoint made them, but not too long ago a few people were showing pictures of custom front mounts, running through where the washer bottle was located at, trying to dig up the thread but I can't find it. Think Scott89T2 was posting in it.

Here we go, they were using turbo's but, basically the same thing
https://www.rx7club.com/forum/showth...hreadid=176546

Makenzie71

kewl...thanks


[Quote]
If you mean the newer WS6 ram air, it is not actually sealed. The older ram air Trans Am cars (70 and later?) had a flapper door.
http://home.att.net/~ops32cars/transam24.html[/QUOTE[


but how do they keep water from entering the system? I understand the concept of a ram air but I want to prevent water from entering my system in mas amounts.

Quote:

You mean a scoop like this? It will never work.
http://www.toddveney.com/

no no no no...lol. I mean just like a regular hood scoop molded into the hood or similar. Kinna like the TII scoop.

Quote:

That sounds about right, and it would equate to somewhere around 2% hp increase/decrease. Ram air makes a bigger difference as the speed increases.

I'm tryig to find a way to get at least 1lb of pressure built up at 80-90mph...how would I do this and still stay all-motor (kinna).