15 WRX overboosting, stock.
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This is a discussion on 15 WRX overboosting, stock. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hey guys, this is my first subaru and i have noticed that it is over boosting up to between 21.2-22psi ...

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    15 WRX overboosting, stock.

    Hey guys, this is my first subaru and i have noticed that it is over boosting up to between 21.2-22psi on the boost gauge, factory say the max boost should be 15.9psi if i remember correctly. Can someone tell me if this is normal? Or is the gauge just overstating the boost? My dealer couldnt answer the question :/. Thanks.

    Also does humidity/rainy weather affect max boost as well? Or does it not matter?

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    zax
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    Both the 2015 WRX and STi seem to exhibit boost spiking from the factory. A lot of preliminary logs suggest that this is not a concern at the moment.
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    That is good news. Thank you, i was about to start calling other dealerships. Thats over a 6psi discrepancy over factory specs.

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    zax
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    Quote Originally Posted by Lockup1109 View Post
    That is good news. Thank you, i was about to start calling other dealerships. Thats over a 6psi discrepancy over factory specs.
    There is a check valve (reed or schrader valve) in the IM of the WRX that disallows manifold pressures above 22 PSI.
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
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    Registered User Aggie Subaru's Avatar
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    My max boost so far is 21.0

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    I've seen it up to 22.6. I've made a thread asking the same question at nasioc yesterday. I was told that its not an issue and it only happens for a short time before the boost goes back down to where its suppose to be. But IDK. I feel like its so common that Subaru would of known about it a LONG time ago now. Before these cars were even sold to the public. But that's just my guess. IDK how the whole car making process works.

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    Registered User Goose42's Avatar
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    Quote Originally Posted by zax View Post
    Both the 2015 WRX and STi seem to exhibit boost spiking from the factory. A lot of preliminary logs suggest that this is not a concern at the moment.

    This! Simply boost spike.
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