Cold Air or Short Ram???? - Page 2
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This is a discussion on Cold Air or Short Ram???? within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by wrx1234 When i say SRI i'm thinking of the cone filter being where the original air box ...

  1. #16
    Master Baiter EJ257's Avatar
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    Quote Originally Posted by wrx1234
    When i say SRI i'm thinking of the cone filter being where the original air box is. That would keep the MAF in the same spot (at least on my 09) with the same diameter pipe.
    That doesn't matter. It still causes issues with the IAT sensor, and will require adjustments to the MAF scaling.
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  3. #17
    Subaru Newb MainFrame's Avatar
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    Also, the location of the filter can introduce turbulence which can be an issue with MAF scaling.

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    Registered User EndlessSea's Avatar
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    I have a perrin cold air intake on mine. (Although on a 2013) and my intake temps are nearly exactly what they were with the stock box. ~20 degrees +-5 over ambient at most. IMO it was worth it for sound alone. The extra power was a bonus lol

  5. #19
    Registered User wrx1234's Avatar
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    Quote Originally Posted by MainFrame View Post
    But the cone filter draws air from right there, where as the stock box draws it's air from the ram air scoop in the front of the car next to the headlight..



    The main problem with the IAT sensor in a short ram is if you're drag racing or something. While your car is sitting, idling, in the staging lanes the IAT will read very high, causing the ECU to pull timing. Then when you go for your pass the air is cooled as soon as the car starts moving, but it takes some time for the ECU to add timing back in, so your car will be down on power.
    Ahhh i get it thanks for the explanation. So the aftermarket intake mostly screws with the MAF but the air eventually going in the engine doesn't really change unless you get a better IC.
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  6. #20
    Subaru Newb MainFrame's Avatar
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    The temperature of the air entering the intake still effects the temperature and density of air entering the engine. . but according to the testing I did with my old SRI, as long as your car is moving 30mph or more the air entering a SRI will be virtually the same temperature as air from the fender well where a CAI would be. SRI is really only a hot air intake while the car is stationary,but due to how the ECU works that can bring your power levels down (for a short time) while moving too.

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