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Thread: New Product - GrimmSpeed TMIC Ducting

  1. #1
    Senior Member SixStar's Avatar
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    Cool New Product - GrimmSpeed TMIC Ducting

    This could work perfect for the 818!

    gCBLD63.jpg

    It's being marketed toward dyno tuning but it doesn't take much imagination to see that it could work amazing for our cars.

    Here's the info from Grimmspeed:

    "We have a fun product release coming later this month! This one is for the dyno tuners that struggle (like the rest of us) to setup a fast, reliable and repeatable fan setup on a TMIC car. Subaru hood scoops force a MASSIVE amount of air through the core and simulating that on the dyno can be a challenge. The GrimmSpeed lineup of TMIC Dyno Ducts should help alleviate some of that headache and provide the best possible test and tune conditions.

    Tag a tuner that needs a setup like this. We will have a special purchase program available for our Authorized Retailers and will also sell them on our website to anybody that needs one."
    Owner/builder - AEM Intakes 818R #85

  2. #2
    Senior Member FFRSpec72's Avatar
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    This s basically what I built to take in air from the side vents, the height would be a concern to look into, also are those 3" or 4" duct openings ? Also will this only fit the Grimmspeed TMIC ?
    Tony Nadalin
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    FFR MkII Challenge Car, Spec Racer, Street Legal, SCCA, ICSCC and NASA Racing
    818R Build in progress

  3. #3
    Mechie3's Avatar
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    Likely only the grimmspeed TMIC. It won't fit with the R/S engine cover stock likely. My aftermarket TMIC wouldn't even fit.
    Zero Decibel Motorsports
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  4. #4
    Senior Member SixStar's Avatar
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    How much space is under the roof of the C?

    Yes they are designed for GS intercoolers specifically.

    yWiqCAn.jpg
    Owner/builder - AEM Intakes 818R #85

  5. #5
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    It is pretty tight where the TMIC sits, maybe 4". at some points.818 duct underside 2.jpg818 duct underside 3.jpg
    Last edited by Mitch Wright; 12-14-2016 at 05:51 PM.

  6. #6
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    It would work perfectly try for a C and there are the roof scoops on both sides. Kinda wished I didn't go awic already.

  7. #7
    Senior Member Blwalker105's Avatar
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    The coupe's roof ducting has an effective cross-sectional area of between 2.5"-2.75" for most of it's length. I would want some heavy-duty math involved here to prove that wouldn't be a substantial restriction to the intercooler's needs, especially at lower vehicle speeds.

  8. #8
    Senior Member Blwalker105's Avatar
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    Oops, sorry. I meant effective cross-sectional diameter of 2.5" - 2.75".

  9. #9
    Senior Member DodgyTim's Avatar
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    Quote Originally Posted by Blwalker105 View Post
    The coupe's roof ducting has an effective cross-sectional area of between 2.5"-2.75" for most of it's length. I would want some heavy-duty math involved here to prove that wouldn't be a substantial restriction to the intercooler's needs, especially at lower vehicle speeds.
    As an approximation, you can calculate what size pipe a non-circular duct will flow like
    hydraulic diameter.png

    For example a 1"x 3" rectangular opening will flow like a 1.5" duct

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