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Old 02-24-2010, 02:47 AM   #1
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Default DIY Miata hood vents?

Before I go hacking on the hood to relieve the pressure underneath, does anyone have some pictures of Miata hoods that have had this done?

It will be the typical gutter guard material painted graphite, with the metal trim and bolts being painted the same color (same thing I did the air intake hole in the hood from the FMII intake)

I'm hoping this will help keep temps down in the summer, and will also help with it getting squirrelly/light on the top end.
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Old 02-24-2010, 04:06 AM   #2
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Been discussed several times, do some searching. "mini hood scoop" will probably net you the best results.
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Old 02-24-2010, 01:16 PM   #3
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Old 02-24-2010, 02:50 PM   #4
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Old 02-24-2010, 04:17 PM   #5
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Thanks guys. Through a PM from a fellow swap member, I think a Carbontrix hood vent might be the solution after seeing the thread Levnubbin posted. Apparently, "extraction hood" brings up a better idea of what I was after.

Quote:
Originally Posted by Braineack View Post
Once Brad puts his hood on...same as above...I'll steal his stock hood and do the CF vent like this one:

Hoping the hood will come out about like this. The bump in the vent should intensify the venturi effect, helping to pull the air out of the radiator.
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Old 02-24-2010, 04:25 PM   #6
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Some say a .38 is perfect for releiving that underhood pressure, but in my experience a .45 is nice for the headroom it allows. You get a lot more flow through each hole. If you want a splashier look, a shotgun loaded with slugs will work. I think its a bit ricey though.
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Old 02-24-2010, 04:26 PM   #7
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Man that was like 2 years ago and I still have the scoop and hood just sitting around waiting for me :(
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Old 02-24-2010, 04:31 PM   #8
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Quote:
Originally Posted by Sparetire View Post
Some say a .38 is perfect for releiving that underhood pressure, but in my experience a .45 is nice for the headroom it allows. You get a lot more flow through each hole. If you want a splashier look, a shotgun loaded with slugs will work. I think its a bit ricey though.
I'd advise taking the hood off of the car for this method, or at least open it and shoot from the underside up...less block/radiator/everything else damage that way.
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Old 02-24-2010, 04:33 PM   #9
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Some other good threads...

https://www.miataturbo.net/forum/t37916/

https://www.miataturbo.net/forum/t33438-8/

I can't find the picture but there is one out there showing the pressure deltas across the hood. The optimal location is just behind the headlamps on an NA. Second best would be same place but closer together or just behind the radiator. Someone else likely has that pic bookmarked or it might be in one or more of these threads.

The Cspence thread has all sorts of good DIY projects.
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Old 02-24-2010, 04:35 PM   #10
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Quote:
Originally Posted by Sparetire View Post
Some say a .38 is perfect for releiving that underhood pressure, but in my experience a .45 is nice for the headroom it allows. You get a lot more flow through each hole. If you want a splashier look, a shotgun loaded with slugs will work. I think its a bit ricey though.
I prefer .22 rounds. Cheap, stealthy, effective, and will easily drop a deer (among other creatures of annoyance) where they stand.

Quote:
Originally Posted by Braineack View Post
Man that was like 2 years ago and I still have the scoop and hood just sitting around waiting for me :(
You need to get on it.

Once I get a quote from RHarris, mine will be on within the next week, but the first start won't be for another few weeks
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Old 02-27-2010, 11:07 AM   #11
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Has anyone seen something like this for the Miata?
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Old 02-28-2010, 02:46 PM   #12
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Quote:
Originally Posted by cueball1 View Post
The optimal location is just behind the headlamps on an NA.
That part kind of sucks.. I have my intake hole cut out in that location!
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Old 02-28-2010, 03:25 PM   #13
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Quote:
Originally Posted by chpmnsws6 View Post


Has anyone seen something like this for the Miata?
Does this help?
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Old 02-28-2010, 05:10 PM   #14
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I have seen that several times, but never with a legend attached. Is it showing pressure or speed? I only ask because of the red under the nose.
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Old 02-28-2010, 09:21 PM   #15
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Would the NA have the same pressure areas as the NB?

That is exactly the kind of pictures I'm looking for!
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Old 02-28-2010, 09:57 PM   #16
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Here's my recent project, it's still not done...

It's a Nissan (Datsun?) 280zx turbo hood scoop/vent. It's a bit big, but I think it's going to be pretty efficient.

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Old 02-28-2010, 10:10 PM   #17
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I had considered that vent, but didn't get it since I thought it was a little large. Looks good though.....
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Old 02-28-2010, 11:07 PM   #18
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Quote:
Originally Posted by whataboutno View Post
Here's my recent project, it's still not done...

It's a Nissan (Datsun?) 280zx turbo hood scoop/vent. It's a bit big, but I think it's going to be pretty efficient.








You have any pictures of this hood on the car....
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Old 02-28-2010, 11:11 PM   #19
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The car is still in storage for another month, keeping away from the salty roads. I'll post pics as soon as it's on.
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Old 02-28-2010, 11:15 PM   #20
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Is that louver/vent metal? Right now I am using a pontiac gtp vent/louver and its plastic so I am a bit worried about the heat (Not that I couldn't put some reflective material and or make a metal shield to mount under it). Also what are the dimensions on that sucker?
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