Cold Air Induction Kit
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This is a discussion on Cold Air Induction Kit within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; Hi guys. I was wondering if anybody could give me some advice!? I have a 2004 Impreza WRX, I've recently ...

  1. #1
    Registered User loua84's Avatar
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    Cold Air Induction Kit

    Hi guys.

    I was wondering if anybody could give me some advice!?

    I have a 2004 Impreza WRX, I've recently fitted an AEM cold air induction kit. Yesterday I was told by a Subaru mechanic that I might blow a piston with that kit on. Is this true is it possible?

    Thank you for your help

    Kind Regards

    Lourens

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  3. #2
    Registered User wrx1234's Avatar
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    I'm no expert. From lurking and reading through these forums it seems that using an intake causes the the engine to run lean due to the increased airflow. I would stay out of the turbo and get a tune as soon as possible. I haven't heard about anyone blowing a piston, but running lean can't be good.

  4. #3
    Registered User JUSTINSNUTSWINGER's Avatar
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    Are you running any engine management ?
    N-swinger

    2000 Escort

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  5. #4
    Moderator Donkey's Avatar
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    The problem with intakes has nothing to do with more airflow. The problem has to do with how the MAF system was designed for Subarus and how the Openloop fueling works. If the intake causes to much turbulence or has a larger than stock inner diameter MAF housing the MAF signal is no longer calibrated. In Openloop fueling the ECU does not use the O2 sensor feed back and relies on the MAF signal as the primary fueling sensor. Closed loop fueling uses O2 sensor feed back to make corrections to fueling.

    CobbTuning.com - Aftermarket Intakes
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  6. #5
    Master Baiter EJ257's Avatar
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    Older AEM intakes weren't properly-designed and could screw with the MAF readings. They have since supposedly remedied the problem. Whether or not you have the newer revision, I'm not sure.
    2005 WRX STi (Mods | Virtual Dyno)

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  7. #6
    Registered User loua84's Avatar
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    Quote Originally Posted by pzr2874 View Post
    Are you running any engine management ?
    Hi, no i haven't added or changed the management.

  8. #7
    Registered User loua84's Avatar
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    Quote Originally Posted by Donkey View Post
    The problem with intakes has nothing to do with more airflow. The problem has to do with how the MAF system was designed for Subarus and how the Openloop fueling works. If the intake causes to much turbulence or has a larger than stock inner diameter MAF housing the MAF signal is no longer calibrated. In Openloop fueling the ECU does not use the O2 sensor feed back and relies on the MAF signal as the primary fueling sensor. Closed loop fueling uses O2 sensor feed back to make corrections to fueling.

    CobbTuning.com - Aftermarket Intakes

    It is quite a large diameter pipe, would you suggest to rather remove the induction kit and put the original on?

  9. #8
    Registered User loua84's Avatar
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    Quote Originally Posted by Donkey View Post
    The problem with intakes has nothing to do with more airflow. The problem has to do with how the MAF system was designed for Subarus and how the Openloop fueling works. If the intake causes to much turbulence or has a larger than stock inner diameter MAF housing the MAF signal is no longer calibrated. In Openloop fueling the ECU does not use the O2 sensor feed back and relies on the MAF signal as the primary fueling sensor. Closed loop fueling uses O2 sensor feed back to make corrections to fueling.

    CobbTuning.com - Aftermarket Intakes
    Hi, the intake's diameter is quite large, would you suggest to rather replace it with the original?

  10. #9
    Moderator Donkey's Avatar
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    The MAF housing in the stock airbox is 65mm. If the intake is larger than that then yes replace it.
    Resident Adviser @ WTF Tuning, LLC
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