Why is my IAM at 15?
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This is a discussion on Why is my IAM at 15? within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; Hey guys, been looking at my learning view on my 02 wrx and noticed my iam is at 15 and ...

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    Why is my IAM at 15?

    Hey guys, been looking at my learning view on my 02 wrx and noticed my iam is at 15 and i have some knock. Could you all look at this and tell me what you suggest i do?

    Car
    02 wrx
    jdm ej205
    catless uppipe, midpipe, downpipe,
    spt catback
    spt cai
    silicone inlet
    PNP td04 (mirrored finish)
    xpt stage 2 tune

    Heres the snapshot of my learning view after 50 miles on ecu reset

    https://drive.google.com/file/d/0B0K...ew?usp=sharing

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    OMG WTF MainFrame's Avatar
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    Looks like you have a vacuum leak..

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    Would you guess boost leak or pre turbo?

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    Pre-turbo.. although you might have a boost leak too.. I would check the whole thing for leaks.

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    what makes you assume preturbo if you dont mind me asking? i want to learn this as i go.

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    Negative a/f learning.. looks like a vacuum leak (which could be anywhere between the MAF and the heads.

    If you just had a boost leak under pressure then you would see positive a/f learning, and it would probably have trouble reaching target boost.

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    Interesting, I always though negative number meant the car wasn't recovering the measured are because of a boost leak, I didn't think pre turbo would cause rich condition. I'll go through and start putting clamps on all my connections to the silicone inlet, those hoses don't feel too air tight

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    Stock injectors? You claim to have a "JDM EJ205." Does this include the fuel assembly? TGVs?

    I find it interesting the learning is pretty even across the airflow bins.

    FYR, negative learning means the ECU is removing fuel, not adding fuel. Therefore, it is unlikely that a vac leak is the culprit.
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    Quote Originally Posted by zax View Post
    FYR, negative learning means the ECU is removing fuel, not adding fuel. Therefore, it is unlikely that a vac leak is the culprit.

    Derp

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    Quote Originally Posted by zax View Post
    Stock injectors? You claim to have a "JDM EJ205." Does this include the fuel assembly? TGVs?

    I find it interesting the learning is pretty even across the airflow bins.

    FYR, negative learning means the ECU is removing fuel, not adding fuel. Therefore, it is unlikely that a vac leak is the culprit.
    Yes Jdm ej205, swapped everything myself. I'm mechanically inclined, tuning is just taking me a bit of time to learn. But the entire intake was taken from my usdm motor. As for the negative numbers meaning removing fuel due to less air, would you guess boost leak?

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    OR could it be that the tune calls for 17psi and I'm set at 15? It seems to boost pretty well although the spool becomes a sort of whistle, at first I thought it was the port and polish but now I'm thinking something post turbo is leaking.

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    Quote Originally Posted by Bahaa425 View Post
    OR could it be that the tune calls for 17psi and I'm set at 15? It seems to boost pretty well although the spool becomes a sort of whistle, at first I thought it was the port and polish but now I'm thinking something post turbo is leaking.
    Are you saying that the tune targets 17 psi and you're hitting 15? Or that you have set the target to 15?
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    Quote Originally Posted by zax View Post
    Quote Originally Posted by Bahaa425 View Post
    OR could it be that the tune calls for 17psi and I'm set at 15? It seems to boost pretty well although the spool becomes a sort of whistle, at first I thought it was the port and polish but now I'm thinking something post turbo is leaking.
    Are you saying that the tune targets 17 psi and you're hitting 15? Or that you have set the target to 15?
    I have it set to 15 I'm pretty sure, I only shortened the actuator arm 1.5 turns thinking it'd be enough but im only getting to around 1.05 bar. It seems to get there then fall back to 14.5 and try and go back up

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    Quote Originally Posted by Bahaa425 View Post
    I have it set to 15 I'm pretty sure, I only shortened the actuator arm 1.5 turns thinking it'd be enough but im only getting to around 1.05 bar. It seems to get there then fall back to 14.5 and try and go back up
    Well this isn't the reason for your fuel trims, but it also isn't the appropriate way to set your boost control either.
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    Quote Originally Posted by zax View Post
    Quote Originally Posted by Bahaa425 View Post
    I have it set to 15 I'm pretty sure, I only shortened the actuator arm 1.5 turns thinking it'd be enough but im only getting to around 1.05 bar. It seems to get there then fall back to 14.5 and try and go back up
    Well this isn't the reason for your fuel trims, but it also isn't the appropriate way to set your boost control either.
    I disagree, hear me out why. If the tune calls for 17psi and is only seeing 15psi, the ecu should trim fuel to compensate correct? If in going at this wrong tell me. As for the way I adjusted the wasgate, this is something that is recommended by xpt and Cobb when you go stage 2 unless you have a ebcs

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