STI Hood Scoop vs. WRX Hood Scoop
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This is a discussion on STI Hood Scoop vs. WRX Hood Scoop within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Have an 05 WRX, looking to do a TXS UTEC stage 2 soon and wanted to know if there would ...

  1. #1
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    STI Hood Scoop vs. WRX Hood Scoop

    Have an 05 WRX, looking to do a TXS UTEC stage 2 soon and wanted to know if there would be any advantage or disadvantage of using the bigger scoop with the stock intercooler?

    Thanks.....

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  3. #2
    Registered User fatgroundhog's Avatar
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    There may be a very slight advantage, but not anywhere close to enough to warrant the cost. Most of us got them because the bigger scoop looks cooler.

  4. #3
    Registered User bigwrxguy's Avatar
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    how much is it?

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    Registered User qoncept's Avatar
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    I've read that along with the STi TMIC splitter, the post-intercooler temps are significantly lower than stock. Search around on wrxfanatics.com.

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    I think on the 05' cars the hood scoop is the same as the STI. I was at the dealer yesterday and they look the same to me? The intercooler is larger but has more boost drop. Which means higher turbine speeds to achieve same boost and more lag. The STI intercooler is not more efficient it's just bigger?

  7. #6
    Registered User D0WNxSH1FT's Avatar
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    the '05 WRX scoop is smaller than the STi.

    here is a STi scoop (gotta love P-shop LOL) and a WRX scoop
    Last edited by D0WNxSH1FT; 02-28-2006 at 06:31 PM.
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  8. #7
    Registered User WRXcelration's Avatar
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    the sti scoop with the stock wrx splitter will just flow more air....if you get the STI TMIC and just get the scoop and no splitter you will flow less air and the seal on the intercooler will be incorrect...you must use the proper splitter with the specific intercooler in order to maintain the proper seal and airflow into the intercooler
    05 STI

    Speed Comes At A Price...How Fast Can You Afford To Go?

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    I have seen the light, or the scoop as the case may be. I think you have missed your true calling in life...lol....lol..

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    the larger scoop does not lower temps at speed per se.

    its primary action is to increase the rate at which ic temps fall after being stopped (and subsequently heatsoaking) and resuming forward motion.

    once the "cooling off" time has passed, the scoops are effectively equal.

    however, some have said that the taller scoop DOES do a better job of catching air at high forward speeds (115+ mph), but that has been unproven so far, at least with any hard charge temp data.

    hth
    ken

  11. #10
    Registered User AUTO228's Avatar
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    If the bigger scoop can't lower more ic temp. Why sti have bigger scoop? Only because of looking better??

    bigger=better!!
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    I think what they are trying to say is that the STI's scoop works with it's larger intercooler and that it would not benefit the WRX as you are not changing the intercooler just the means in which it is cooled?

  13. #12
    Registered User qoncept's Avatar
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    You guys have it all wrong.

    Quote Originally Posted by qoncept
    I've read that along with the STi TMIC splitter, the post-intercooler temps are significantly lower than stock. Search around on wrxfanatics.com.
    Sure, that forum sucks, but.. well, just take a look.

  14. #13
    Moderating on the run! Big Sky WRX's Avatar
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    I have my doubts w/ the STi scoop and oe intercooler- first you absolutely have to use the oe "splitter" (doesn't split like the STi one) w/ the oe ic and vice versa (STi w/ STi). The seal is absolutely critical in a efficient ic.

    If you look at the oe splitter it effectivly seals at the top of the scoop- all of the air coming in is directed at the ic- when you go to the taller scoop, the oe "splitter" comes up short and the top is no longer in contact w/ the scoop- thus part of the air from the taller scoop is flowing over the oe splitter-not beng directed to the intercooler. I don't think it's hurting performance any as it should still recieve the "normal" amount of air, but don't see any benefits beyond aesthetics.

    What would benefit the oe intercooler is a real splitter like the STi one has, if you look closely at your ic you will see bug/debris depostion almost exclusively at the rear of the intercooler. Spliting the air so the entire ic sees it would be benficial.

    Intercoolers are much "trickier" than one would think- there are several parameters- flow, pressure drop, cooling efficiency- that have to be considered. Generally the ones that flow better, cool less effciently and vice versa. Also bigger intercoolers can act as heat sinks (holding heat in longer) than a small one. Lots of trade offs to consider, there is no perfect intercooler- its going to vary on what your apllication is.

    Big Sky

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    Quote Originally Posted by Big Sky WRX
    I don't think it's hurting performance any as it should still recieve the "normal" amount of air, but don't see any benefits beyond aesthetics.
    you might not see them, but wrx1 on nasioc proved them years ago with an autometer dual probe temp sensor.

    bottom line: bigger scoop = faster cooling

    ken

  16. #15
    Registered User bone138's Avatar
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    After putting my STi scoop on the stock hood scoop just looks wimpy. I'm sure the performance difference is minimal.

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