I see alot of people on here with the hoods with hood scoops and I was wondering who's is actually functional and how they made it functional. I was trying to think of ways to make a air duct or vent sort of like the 350z has, like cutting a small hole in the hood near the air filter for ram air when the car is moving at higher speeds...any did this? or any ideas/pics?
Front Bumper of 350z
Don't you need special fuel management to effectively use ram air?
bradsk88 wrote:Don't you need special fuel management to effectively use ram air?
I have no idea what you are talking about, but I'm talking about the ram air intake, like a hood scoop, when you're driving, the outside air goes into the vent and aimed at your filter for colder air rather than taking in warmer engine air.
Oh I thought the goal was 'more' air. Colder makes sense.
"Cold": air is a joke. Idc how big of a hole you cut anywhere. You cant take in air any colder then the ambient air temp. Now what youre talking about is a fresh air intake.
If you're going to make it yourself you'll need to put the streamers on the car with some tape and drive around to make sure your'e not trying to put it in a low pressure zone.
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RK sport's ram air hood does run a duct to the air filter and dumps outside air there. I have never made a setup to block off the bay air since it will not be noticeable if even provable. In theory yes it would but your talking next to nothing.
Todd Miller, is the only one that comes to mind.
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bradsk88 wrote:Don't you need special fuel management to effectively use ram air?
No, you don't.
As for the design... Did you ever see a Pro-Stock car? See the scoop they use? That's the scoop design that really works, because it's inlet gets up-above the turbulent boundry-layer air found along the surface of the hood as the vehicle is moving forward. And it is actually sealed-up so all the air collected isn't wasted blowing past the filter & inlet-tract or throttle-body. This design has been in-use for a few decades now, so it must work! Otherwise, I just recommend just mounting velocity-stacks in the front-fascia & adding ducting. (The only other design that works)
Go beyond the "bolt-on".
Nickelin Dimer wrote:bradsk88 wrote:Don't you need special fuel management to effectively use ram air?
No, you don't.
As for the design... Did you ever see a Pro-Stock car? See the scoop they use? That's the scoop design that really works, because it's inlet gets up-above the turbulent boundry-layer air found along the surface of the hood as the vehicle is moving forward. And it is actually sealed-up so all the air collected isn't wasted blowing past the filter & inlet-tract or throttle-body. This design has been in-use for a few decades now, so it must work! Otherwise, I just recommend just mounting velocity-stacks in the front-fascia & adding ducting. (The only other design that works)
X2
nobody on this site has a "functional" hood scoop. its just for looks
I was thinking about having a fresh air port cut and fit in my hood between the headlights to bring in fresh air to cool down the turbo but not for the intake... Kind of like the one in the picture of the 350z.
Just to reduce underhood tempature and help better cool the turbo housing.
I think you need to decide what it's really worth. Is that hole in your bumper or hood going to increase the car's drag coefficient? Is that gain in drag worth the minuet drop in temperature on the compressor housing? Remember, ambient temperature means little when the car's exhaust temp heat up the exact thing you're trying to cool down. So now what do you have?
A hole in the front of your car most likely made with a Dremel spinning at upwards of 10,000rpms generating so much heat from friction you just melted the paint and plastic bumper (So it now looks like complete A$$). This hole now is trying to catch air to cool something down that is already upwards of 180 degrees using air that is between 20-110 degrees depending on where you live and the time of year. Soooo you rev higher and drive faster, and up go your EGTs. Now what little aerodynamics your car has left takes over, and the fresh "ram" air hole in your bumper now becomes totally useless.
This is just my opinion on logic as I see it. Do what makes you happy.
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Darkstars wrote:Nickelin Dimer wrote:bradsk88 wrote:Don't you need special fuel management to effectively use ram air?
No, you don't.
As for the design... Did you ever see a Pro-Stock car? See the scoop they use? That's the scoop design that really works, because it's inlet gets up-above the turbulent boundry-layer air found along the surface of the hood as the vehicle is moving forward. And it is actually sealed-up so all the air collected isn't wasted blowing past the filter & inlet-tract or throttle-body. This design has been in-use for a few decades now, so it must work! Otherwise, I just recommend just mounting velocity-stacks in the front-fascia & adding ducting. (The only other design that works)
X2
nobody on this site has a "functional" hood scoop. its just for looks
my cbd hood was purchased for the specific purpose of directing air to where my turbo air inlet will be. it will end up near where the end of the brake booster is. for that matter its the only reason i have my front bumper, function my intercooler completely fills the opening.
Edited 1 time(s). Last edited Monday, January 31, 2011 7:41 PM
I have the RK Sport SS hood and it has ducting from the scoop that goes to a part of the engine bay... does it do anything... doubt it... I want an evo hood just so I can see the blower lol
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95LsCoupe wrote:I see alot of people on here with the hoods with hood scoops and I was wondering who's is actually functional and how they made it functional. I was trying to think of ways to make a air duct or vent sort of like the 350z has, like cutting a small hole in the hood near the air filter for ram air when the car is moving at higher speeds...any did this? or any ideas/pics?
RKSport is functional.
I have the "Ram-Air" hood. I cut open the stock air box so the air captured by the hood is directed to the air box and I surrounded the hood opening in foam so there is less lossed. It works as the dirt that accumulates on that hole, foam and exposed upper filter part shows air is indeed going in there. I also removed the bong and adapted a Jeep intake cone on it. All in all, it is picking up air from the front of the car which is normally cooler then what is found inside of the engine bay. Oh and I've had this set up since 2003 and no lock up from water as well, if you were wondering.
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^Pics, please!
Go beyond the "bolt-on".
yea my rk feeds the air box.....well it did we'll the stock box was in.
1KWKCAV [Jim wrote:] A hole in the front of your car most likely made with a Dremel spinning at upwards of 10,000rpms generating so much heat from friction you just melted the paint and plastic bumper (So it now looks like complete A$$).
You Obviously know nothing about me or my car. Sorry I do not do any body work myself. Hence why the front end has not been finished. I was thinking something along the lines of the hood scoop that is incorporated in the Mini Cooper's hood or like the Neon SR-T4. And it has been proven that even raising the hood near the windshield drops tempature under the hood. So why would allowing a direct source of cooler air in the engine bay work against me to simply provide cooler air where hotter air is being produced? Thats like saying that opening up the windows in your house doesnt help cool the overall tempature when the oven is heating the house up. (providing the outside tempature is cooler than the tempature in the house)
I just dont see how providing an extra means of ventilation and fresh air equates out to a bad idea? Maybe if I followed your dumb@$$ idea of using a dremel on my hood or bumper it would look like sh!t but considering it would be professionally molded in I think it would look pretty bad@$$.
But hey like you said that is just my .02.
Nickelin Dimer wrote:^Pics, please!
What would you like to see?
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yea the rksport hood directs it to the air box as some have mentioned although most opt to run a name brand intake anyways.
Mr.Goodwrench-G.T. wrote:Nickelin Dimer wrote:^Pics, please!
What would you like to see?
The results of your work... In making that functional hood-scoop, of course.
Go beyond the "bolt-on".
as it was posted in ^^^^ that thread
Darkstars wrote:z yaaaa wrote:^^^ please explain that ram air hood doesnt do @!#$.
and it is functional, see the open air box? see the cutout on the hood? that cutout goes directly to the massive hole in the hood scooping up the same quality cool air that is down in the fog light area, except it doesnt have the front bumper blocking air flow.
I'll make this quick because I'm about to go to bed, I knew if I didn't reply I'd forget. The reason it doesn't do @!#$ is because of the scoop placement. For example, when in a convertible driving down the highway with the top down you can take a piece of paper throw it up and it doesn't get caught in the wind and go flying out the back of the car, its actually the opposite, it goes back a bit and turns and gets sucked back into the interior of the car (I've tried this first hand with a sebring). Just because it appears like it should do something doesn't mean it will actually do it. I can't find a wind tunnel test of cav specifically but the point is the same.
If you look at the way the air travels over the surface of the car you can see the air flow is channeled considerably higher then the hood line, that "massive hole in the hood" is not connected to a scoop that sits high enough off the hood for it to catch much air, let alone to "ram" it into the intake. If you want a "ram air" to actually be effective you need it to stick up alot.
For example this is a truly functional ram air....
this is not....
The aerodynamics of cars in general make extractor type hoods a lot more functional then scoops. That area below the channeled air flow but on top of the hood would be a low pressure area, a hood like the evo hood would allow hot air to be pulled up out of the engine bay by the low pressure and sucked away. A ram air hood wouldn't be completely useless but I think most people greatly over estimate how much it can actually do. I remember reading somewhere about air flow. One thing it said is that gradual bends are a lot better then sharp bends (obviously) and went on to say a single 90* bend has the same restriction as adding 8 feet of straight pipe. Look at the front of the scoop through the hood, through the airbox, through the intake piping to the throttle body and compare that to a straight pipe from the throttle body with a single bend dipping just down inside the fender.... weather the bumper blocks direct flow or not your going to get far more air flow with that setup over the "ram air" setup.
^^^ lmao!! Back when I was a kid and riding in back of my moms s10 with a cap on it, I decided to spit a wad out the back window. To my surprise it.went out like 7 feet, then very fast sucked right back into the truck at amazing speed. I was stumped to say the least
I have a ss scoop fiberglassed onto my metal hood with fiberglass pop rivets fiberglass filler ect old hot rod trick any way when I added the scoop my car runs at 190 instead of 195 but I'm also running a tranny cooler so that could be part of it with no hot tranny fluid running through the rad...
