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2004-2007 Cadillac CTS-V Appearance Mods Discussion, So maybe I'll just make a DIY Heat Extractor hood in Cadillac CTS-V Series Forum - 2004 - 2007; Originally Posted by bneal1022 I do not believe placement matters as much as the size. Given fluid dynamics.....would these not ...
  1. #16
    AAIIIC's Avatar
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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Quote Originally Posted by bneal1022 View Post
    I do not believe placement matters as much as the size. Given fluid dynamics.....would these not simply work like venturis? The rushing air across the top will cause a low pressure and draw air up through the vents while in motion?
    You can't have it both ways. As you said, size is important - you want the things to be big enough to move enough air that they actually make a difference. But, the bigger they are, the less that venturi effect is going to work - you have some pressure difference between the relatively stagnant air underhood and the fast moving airstream on top of the hood, and the larger the area of the vent is, the smaller the differential pressure. You'll see on a lot of race cars that there's some sort of wicker on the leading edge of the hood vents to help generate a greater D/P.

    And, just to clarify, placement does matter as far as where the radiator is. Going back to the Volvo S80 diagram I posted before, you can see that the light blue (lowest pressure on top of the hood) is towards the front. To maximize the D/P and make the vent more effective, I would want to put it in that light blue zone. But if I do that the vent is probably in front of or maybe right on top of the radiator, which means it's not doing much to help air flow. That's the mistake I made on my Mustang's hood - the hood vents I had added are too far forward, so I don't think they're as effective as they could've been a couple inches farther back.
    '05 Stealth Grey CTS-V, Hyper Silver Linea Corse Venetos w/Continental ExtremeContact DWs (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Im already looking for a hood to try this out on, hope to find one this week!

  3. #18
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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Any updates on this? im looking forward to your results im sure i'm not the only one. I really like the z34 vents. I need some vents on the hood to dissipate some heat.

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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Quote Originally Posted by AAIIIC View Post
    You can't have it both ways. As you said, size is important...
    So, any updates w/ the z34s?

    Off topic question: any track days coming up w/in a 5 hour drive? I'm jones'n for a track day and since Luke had to cancel for November I can't wait until 2011. Also, how to you transport your track wheels/tires in the V?

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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Quote Originally Posted by MO POWA! View Post
    Any updates on this? im looking forward to your results im sure i'm not the only one. I really like the z34 vents. I need some vents on the hood to dissipate some heat.
    Quote Originally Posted by kirchbed View Post
    So, any updates w/ the z34s?
    I'm not sure when I'll actually get around to trying this. It's honestly not near the top of my list of vehicular projects, but I might get to it at some point this fall/winter.

    Quote Originally Posted by kirchbed View Post
    Off topic question: any track days coming up w/in a 5 hour drive? I'm jones'n for a track day and since Luke had to cancel for November I can't wait until 2011. Also, how to you transport your track wheels/tires in the V?
    I'm running Summit Point Main with the NCC BMWCCA on 10/16-17. Not sure if they still have any openings left (and no, I'm not a BMWCCA member). After that will be VIR Full in mid-November with the PCC Audi Owners Club - still need to actually register for that one (yes, I am an Audi Owners Club member, but Audi ownership is not required to become one). That may turn into a 3 or 4 day event, as Trackdaze is running the Mon/Tue after Audi's weekend event. Hmmmm...
    '05 Stealth Grey CTS-V, Hyper Silver Linea Corse Venetos w/Continental ExtremeContact DWs (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

  6. #21
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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Pat has it right with the Z34 vents. I picked up a complete set. Only problem is the drip pans are a no go. If you squint you can see them in my not so good dark garage picture. You'd need to be a bit creative to modify them.




    The side mount vents just are not sexy enough.




    Here's the best spot and I'm sure Pat agrees. My body guy can mount and paint for $500.00. A good value for an extractor hood that should really work.


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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Double post. Ooops.

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    Re: So maybe I'll just make a DIY Heat Extractor hood

    I still have my set of vents, just haven't had a chance to do anything with them. I'd like to be able to find a used hood to butcher. And I'd need to find someone I trust to do the work, as this isn't something I'd want to give to any old body shop.

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    Quote Originally Posted by AAIIIC
    I still have my set of vents, just haven't had a chance to do anything with them. I'd like to be able to find a used hood to butcher. And I'd need to find someone I trust to do the work, as this isn't something I'd want to give to any old body shop.
    I got lucky and found a guy that's done quite a few. This is a popular mod with the off road guys and he's been doing Land Rovers and Jeeps. He's even done one on an STS.

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    Re: So maybe I'll just make a DIY Heat Extractor hood

    will be interested to see the finished product.

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    Re: So maybe I'll just make a DIY Heat Extractor hood

    please keep updating!

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    xbladr is offline Cadillac Owners Fanatic
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    Re: So maybe I'll just make a DIY Heat Extractor hood

    yea please keep us updated id love to see the results

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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Bringing it to the shop tomorrow for the Z34 extractor vents. I'll report back in about a week.

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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Cool! Obviously, lots of pics are appreciated (including work-in-progress pics, if possible).

  15. #30
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    Re: So maybe I'll just make a DIY Heat Extractor hood

    Its been done quite a few times in the Sy/Ty community with success. I think it would work...
    2005 cadillac cts-v.r #83 nasa st3 . 2011 escalade esv . 2011 sierra denali

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