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Old 12-01-2012, 09:41 PM   #1
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Default FM hood louvers

Has anyone installed them, and where on a MSM-NB hood? Flyin' Miata : Body : Body parts : Flyin` Miata aluminum louver panel
Most text suggest the rear 25% of the hood but the pressure layout on FM's site seems to show the lowest pressure area to be closer to the headlight(s).
Thanks
Phil
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Old 12-02-2012, 06:05 PM   #2
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Old 12-02-2012, 06:15 PM   #3
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specifically here
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Old 12-02-2012, 08:20 PM   #4
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I bought 2 of these. They will be getting put on my NA during the winter/spring sometime. Mine will go more close to the center of the hood, and a little further towards the headlights. Probably around the bump in the middle of the hood. But i like the idea of having it above the turbo to let some of that heat escape once i stop driving the car, and i turn it off. I'm not really worried about "flow" through my radiator, as much as i am worried about getting the warm air out of the bay. Mainly getting that hot air out and away from where the turbo is.
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Old 12-02-2012, 09:09 PM   #5
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I was thinking the same, but moving them more towards the out edge of the hood. One thing that may dictate the position is the hood bracing. The trick I feel is to remove the bracing, to promote better air flow, and to use the louver as a bridge between the cuts which may necessitate the addition of a few rivets!
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Old 12-02-2012, 09:26 PM   #6
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I have these Size Large Hood Louvers (11″X 17″) | Hood Vents For Your Vehicle – RunCool Hood Louvers

They look great and are actually engineered to be functional.



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FM hood louvers-530985_10151117402734242_819197725_n.jpg   FM hood louvers-dsc05261.jpg  
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Old 12-02-2012, 09:34 PM   #7
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I'd do a smaller vent, further forward.
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Old 12-02-2012, 09:44 PM   #8
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The FM louvers are only 5" wide x 9" long
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Old 12-02-2012, 09:55 PM   #9
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Quote:
Originally Posted by PhilZ28 View Post
The FM louvers are only 5" wide x 9" long
You want a foil/lip and the vents reduce the size of the hole. Buy whatever you want, but this is the marlin. Those FM vents will probably work if you put them further forward.
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Old 12-02-2012, 10:42 PM   #10
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Quote:
Originally Posted by TNTUBA View Post

They look great and are actually engineered to be functional.
Got some tuft testing to show us? Looks like they are way, way too far back to do anything but vent heat at rest.

If you want an effective duct at speed, it needs to be where Trey's duct is. Nowhere else works nearly as well.
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Old 12-03-2012, 11:34 AM   #11
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Quote:
Originally Posted by hustler View Post
You want a foil/lip and the vents reduce the size of the hole. Buy whatever you want, but this is the marlin. Those FM vents will probably work if you put them further forward.
This one looks like it forces air in, the FM vents are designed to pull air out.
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Old 12-03-2012, 01:28 PM   #12
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Quote:
Originally Posted by PhilZ28 View Post
This one looks like it forces air in, the FM vents are designed to pull air out.

you're a silly silly sad man.
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Old 12-03-2012, 03:14 PM   #13
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you're a silly silly sad man.
Yes, I know.
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Old 12-03-2012, 03:59 PM   #14
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Quote:
Originally Posted by PhilZ28 View Post
This one looks like it forces air in, the FM vents are designed to pull air out.
Close your mouth.
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Old 12-03-2012, 04:10 PM   #15
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Quote:
Originally Posted by PhilZ28 View Post
This one looks like it forces air in, the FM vents are designed to pull air out.
Turn it around backwards, or look at Trey's hood (it's the same vent, just molded in).
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Old 12-03-2012, 04:12 PM   #16
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Quote:
Originally Posted by Savington View Post
Turn it around backwards, or look at Trey's hood (it's the same vent, just molded in).
It pretty much "sons" every other hood I've seen in my life.
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Old 12-03-2012, 06:25 PM   #17
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Quote:
Originally Posted by Savington View Post
Got some tuft testing to show us? Looks like they are way, way too far back to do anything but vent heat at rest.

If you want an effective duct at speed, it needs to be where Trey's duct is. Nowhere else works nearly as well.
Just as a note, that car should spend almost 5x as much time at rest as it does at speed, at least at the events that "count".
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Old 12-03-2012, 06:35 PM   #18
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I put my vents in sideways, that way I get mad flow with my extreme drift angles.
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Old 12-03-2012, 08:00 PM   #19
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So can anyone tell me I can stick my vents
On the hood that is
Thanks
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Old 12-03-2012, 09:21 PM   #20
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Quote:
Originally Posted by Savington View Post
Got some tuft testing to show us? Looks like they are way, way too far back to do anything but vent heat at rest.

If you want an effective duct at speed, it needs to be where Trey's duct is. Nowhere else works nearly as well.
I placed 4 thermocouples under the hood and did before and after testing. I saw an average 52 degree drop in under hood ambient air temps, 11 degree drop in water temp and 23 degree drop in intake air temps. I didn't put it in a wind tunnel to test it though.
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