Cobb SF intake for 2014 WRX concerns
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This is a discussion on Cobb SF intake for 2014 WRX concerns within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Hello, I am new to this (first post) and I have a quick question and would love some enthusiast's opinion. ...

  1. #1
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    Cobb SF intake for 2014 WRX concerns

    Hello,

    I am new to this (first post) and I have a quick question and would love some enthusiast's opinion. I am now buying new stuff for my 2014 wrx wagon and the first thing I want to buy is a Cobb SF intake. As I am doing my research it seems that Cobb requires a ECU tune for the install. Is this true or can I 'plug and play'? I do not have money for the access port or a tune now.

    Any suggestions of experiences?

    Thanks,

    Nic
    14wrxboy

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  3. #2
    Work In Progress GRBOXR's Avatar
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    I would hold off until you are able to afford an Access Port with the intake

    Yes, you need an EM for engine mods
    Last edited by GRBOXR; 04-03-2014 at 10:46 AM.

  4. #3
    Registered User Z31_2011's Avatar
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    If u install the intake the car will not run right it will get too much air I ran into the promblem with mine. It's a 2011


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  5. #4
    Registered User 386WRX's Avatar
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    Yes you need a tune for any aftermarket intake. Save up about $950 for the intake and tune with the box. Do not try to run without a tune. The intake is just for sound at stage 1, if you want that, then go for it. If you are looking for power, then buy a downpipe and an AP an go stage 2.
    I got the intake for sound, now im stage 2 and love it! have fun

  6. #5
    zax
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    Quote Originally Posted by Z31_2011 View Post
    If u install the intake the car will not run right it will get too much air
    No, see this is NOT the problem! It seems that I always have to correct this thinking...

    The issue is that many intakes change the scaling of the MAF voltage compensation. The car meters air by sampling a small amount of flow (MAF sensor) and applying a relationship ( let's call this alpha) to achieve the total mass of air. There are multiple reasons alpha may change with an aftermarket intake. Firstly, by changing the diameter of the MAF housing, the total crossectional area increases and alpha increases. Second, no airflow is perfectly laminar and changing the housing location, orientation, etc. often changes the flow characteristics within the MAF housing. This also changes alpha.

    So, as you can see the reason the car needs to be retuned is due to the MAFv compensation change and the potential that the increased VE puts the car into untuned load cells.
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    Master Baiter EJ257's Avatar
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    You absolutely need to recalibrate the MAF scaling for that intake.

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  8. #7
    Pro Manscaper Mikie13's Avatar
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    Quote Originally Posted by zax View Post
    No, see this is NOT the problem! It seems that I always have to correct this thinking...

    The issue is that many intakes change the scaling of the MAF voltage compensation. The car meters air by sampling a small amount of flow (MAF sensor) and applying a relationship ( let's call this alpha) to achieve the total mass of air. There are multiple reasons alpha may change with an aftermarket intake. Firstly, by changing the diameter of the MAF housing, the total crossectional area increases and alpha increases. Second, no airflow is perfectly laminar and changing the housing location, orientation, etc. often changes the flow characteristics within the MAF housing. This also changes alpha.

    So, as you can see the reason the car needs to be retuned is due to the MAFv compensation change and the potential that the increased VE puts the car into untuned load cells.
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