I saw a few examples of hood cutouts for better airflow (NOT hoodscoops). I'm looking for design ideas, things that members have done (I remember seeing a flame design before...). Thanks

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www.yellowfiero.com/fiero.html
17" DEZENT T wheels with 215/40 tires front and 235/45 rear, KONI shocks, EIBACH lowering springs, drilled/slotted rotors. PU dog bone, all bushings and engine mounts, K&N air and oil filters, OZELOT exhaust, Mercedes SLK yellow paintjob, Mr. Mikes leather seats, door skins, shift and e-brake boots. MP3 deck and custom subwoofer behind passenger seat, F355 style front. Fiero Store rear swaybar, strut tower brace, black carpet, air intake. Rodney Dickman's competition short shifter. Billet aluminum dash kit from Kitcarman.

I think doing the supra style cutouts would look sweet.

[This message has been edited by Azriel (edited 02-26-2005).]

I was looking for existing hood cutout designs on a Fiero - with pix!

You mean like this?

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very easy ( and cheap ) draw /trace an outline on there and cut the fiberglass out.


Everyone at the shows love looking at it. Works very well on the road, keeps the front end stable and glued to the road. not sure why more don't do it....

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88 GT, 3800SC, Getrag 5sp., fastest one in Austin,Texas and surrounding areas.........so far

May be a starting point...



...could make it a bit more round shaped to match up with your 355 front...

(you got a reply )

That's what I meant - no scoop but a cutout. Any opinions why a scoop could work better in extracting air than a cutout?

Tha flame design is a bit extreme for me but a nice idea.

quote Originally posted by revin: very easy ( and cheap ) draw /trace an outline on there and cut the fiberglass out. Everyone at the shows love looking at it. Works very well on the road, keeps the front end stable and glued to the road. not sure why more don't do it....

quote Originally posted by yellowstone: That's what I meant - no scoop but a cutout. Any opinions why a scoop could work better in extracting air than a cutout? Tha flame design is a bit extreme for me but a nice idea.

Scoop = Extracting air.. Since the scoop is allowing the airflow to go over the car, and not allowing anymore in, since you want warm air out, and thats all!

Cutout = Allowing cold air in. Not really allowing any out.. Unless you have vents in your fenders, then you aren't really creating a positive airflow....

Hope that helps!

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Custom Fiero 2M4 - 3800 Swap Coming Soon?....

Here's a great big one. There is an internal flange around the mouth to mount screen to but I haven't got around to it yet. The front comes down and meets the plastic trunk floor. I had some adaptors made to run remote brake reservoirs as the stock one hit the hood.

Guss that is the sweetest hood ever, thats how i want mine to be when im done, didnt u have to modify the front of the car? looks sweet tho.

justin

I don't understand... With increasing speed there's a pressure built-up under the front part of the hood (that also forces the headlight covers up). Now, if I put an (extracting scoop) in the hood or just cut an opening (flame-shaped or whatever), the pressure should force the air out from under the hood, right? Let me know if I got this wrong...

quote Originally posted by Custom2M4: Scoop = Extracting air.. Since the scoop is allowing the airflow to go over the car, and not allowing anymore in, since you want warm air out, and thats all! Cutout = Allowing cold air in. Not really allowing any out.. Unless you have vents in your fenders, then you aren't really creating a positive airflow.... Hope that helps!

Here's a picture of my cutout:

Just cutout the part of the hood above the radiator and put some mesh grille in it's place. Really simple and really cheap.

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Bottle Fed 4.9 V8 5 Speed
87 4 cyl 5 speed coupe
I drive way too fast to worry about cholesterol.

One thing to keep in mind is a flat cutout is facing into the wind due to the slope of the hood. So positive pressure under the hood will have to be higher than the force of the oncoming air to vent it out.

A reverse facing scoop places the oulet of air out of the oncoming air stream and the air going over the scoop actually tends to create a vacuum effect to pull air out from under the hood.

Both will work, but a scoop will be more effective. Whether or not the difference is enough to notice on a street car is debatable.

well it all depends where you cut the hole in the decklid in the first place...I guess the high pressure area is a few inches behind the radiator till the front trunkwall...cut the right area and youre already in business

with my ventmod the front end seems a bit more responsive while keeping the front more stable at high speeds..some downforce i guess/hope.....anyway from the a$$ometer a mod like this feels a little better, not worse ....

You need to decide if you want the front trunk cut for an extreme design. You might loose storage for a sunroof and spare tire....I liked to keep those..

Here are a few of mine. I used the honeycomb mesh from the rear vents and a 2 part epoxy to glue them in place. Don't mind the filth its a daily driver + winter = salt everywere




It helps keep the car cool and helps make the car feel more stable at speed !

The original Warberhood at Archie's...

http://v8archie.com/warberhood.htm

here's a couple more of mine

Racer_JT, did u use t-bird vents / scoops to do you hood mod...? I have a set of em, and they look relatively similar...

Just wondered...

~Tim

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:::: Decklid vent Mods. Coming soon ::::
:::: Matching Hood Vents (keep your eyes open) ::::

And did they affect the seal on the front compartment?
Norm

No mine is all hand done. From my design using the GT40 as the idea. They are quite a bit larger than the T-birds. 10" across and 3" down. Yes it does mess with the seal. I got rid of the seal and cut a small amount of metal out. Plan on trying to reseal it at some point, not a big deal though. I do still have room for the sunroof.

quote Originally posted by yellowstone: That's what I meant - no scoop but a cutout. Any opinions why a scoop could work better in extracting air than a cutout?

well i think its a two part answer

1- the cutout is on a slope that oncoming air wants to ram into - however the air under the hood is at higher pressure so it still works
2- on a scoop the oncoming air moves fast over the scoop and creats a vacuum to suck the air from under the hood. so it works a little better.

[This message has been edited by Kohburn (edited 02-27-2005).]

quote Originally posted by Fie Ro: May be a starting point...

Great work Fie Ro. I was gonna do something similar and may now just use you measeuments to save me some time and agony. You gave us all the demensions except one.
What is this dimension?

quote Originally posted by gusshotrod: Here's a great big one. There is an internal flange around the mouth to mount screen to but I haven't got around to it yet. The front comes down and meets the plastic trunk floor. I had some adaptors made to run remote brake reservoirs as the stock one hit the hood.

pull a mold of that bad boy and sell me one. That is exactly what I had planned to do on the GT.

quote Originally posted by Spiff: Great work Fie Ro. I was gonna do something similar and may now just use you measeuments to save me some time and agony. You gave us all the demensions except one. What is this dimension?

...just got it (brrrrr it is cold outside)...its about 4,75 cm at the sides and 5,0 cm in the center...I reused the cut piece, angled it and moved it forward about 2 inches. I filled the gap at the top with fiberglass and bondo. trunk stays intact. Something to take care of: I found small cracks in the corners, appearantly when the headlights are up they stress that decklid area....I will have to reinforce the corners some more...
You can draw some lines with a marker first and just look from different angles and decide what you want (different)...hope this helps

Hey Azreal could you post some pix of what you have done to the trunk and some under hood pix of the vent? Thanks!!!

quote Originally posted by nightonfire: Hey Azreal could you post some pix of what you have done to the trunk and some under hood pix of the vent? Thanks!!!

its not his - he was quoting gusshotrod

Here's mine, I still have not finished it yet but it sucks the front end right down.

The venting is off an older chrysler laser turbo (pre-mitsubishi) as I recall.

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Updated: 8/18/03 Check out some of my rides:
http://206.71.69.200

Bump, an more?

Late model Camaro turned backward and 86 300ZX facing forward with molded in 355 nose still a WIP.

why the scoop over the brake booster area?

I just cut a big hole in the hood. Contrary to what Custom2M4 says, it's very effective at extracting air. My coolant temps dropped about 20-30F degrees after cutting the hole. It's also very good for defogging the windshield (after the engine warms up).

After the finish work is done, I plan to install honeycomb mesh.

Here's something a little different for ya

big and DEEP is better
I looked at a real FORD GT friday [at the collier collection]
that sucker went to the bottom of the rad about 18" DEEP
and we DO NEED to get the front to STICK at speed
even if we don't go 200MPH like the ford GT

a little slot will help
BUT BIGGER IS BETTER
even if you need to cut the tyre well metal to do it

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Question wonder and be wierd
are you kind?

quote Originally posted by revin:

I really like the flames and the concept behind them, however, even though I did up a template, I chickened out on the design. I'm going for 1/4" X 8" slots set like Sgt's stripes with a center gap with honeycomb behind them. Nice a subtle and good for an actual square footage equal to 48 sq in.

I don't have a pic yet, but the slots should be about 1 " apart, set at 30 degrees, with a center rib between the two sets. I don't think I need the extra engineering of doing the fancy vents to get the job done.

Arn

quote Originally posted by gusshotrod: Here's a great big one. There is an internal flange around the mouth to mount screen to but I haven't got around to it yet. The front comes down and meets the plastic trunk floor. I had some adaptors made to run remote brake reservoirs as the stock one hit the hood.

I like that idea for your breaks, how did you do that exactly, and did you have to do anything special as far as porportioing for front and rear?

quote Originally posted by OH10fiero: I like that idea for your breaks, how did you do that exactly, and did you have to do anything special as far as porportioing for front and rear?

proportioning is controlled by that little gold block of metal you see there - it is stock
all he did was relocate the fluid resevour

any pics of the t-bird turbcoupe scoops? I have a spare set and would like to see how others have grafted them in.-B-

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88 coupe 4.9 Izusu 5-speed Rockcrawl chip. True duels.No A/C .KYB GR-2 on all 4 corners Built to run.

quote Originally posted by 2-tone:any pics of the t-bird turbcoupe scoops? I have a spare set and would like to see how others have grafted them in.-B-

Same here. I have scoops, hood and dremel in hand. Just working on the nerve.

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John DuRette
***Custom 85 under construction, 87 Coupe in the driveway. The fun never ends!***