Erratic acceleration
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This is a discussion on Erratic acceleration within the Engine Performance forums, part of the Tutorials & DIY category; 2011 WRX STI. Car now has 5000 miles on it. Since new, under hard acceleration, the acceleration is slightly erratic ...

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    Erratic acceleration

    2011 WRX STI. Car now has 5000 miles on it. Since new, under hard acceleration, the acceleration is slightly erratic and not smooth. Thought it was just me at first, but after running on the freeway today in Super Sport mode it was very noticeable. Is it normal.

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    Registered User 2002_wagon's Avatar
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    Stop riding it so hard. Are u up to date on maitanace
    278whp 286tq blouch 16g @ 17.5psi
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    Admiral Ackbar the 1st mycologist's Avatar
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    Are you used to a non-turbo car? It isn't like that. What boost are you hitting - does it build up to a peak then taper off or does it go up and down and up and down?

    Normal is less than smooth but not surging then falling on its face then surging again.

    If your boost is surging or below target, since it is new, take it to the dealer and ride with them to demonstrate. If they say it is normal and you disagree, ask to drive another STi or ask them to diagnose whether your DAM is at 1 and if there is any learned knock
    Last edited by mycologist; 03-23-2012 at 11:20 PM.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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    Admiral Ackbar the 1st mycologist's Avatar
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    Quote Originally Posted by 2002_wagon View Post
    Stop riding it so hard. Are u up to date on maitanace
    Why should you buy an STi and "not ride it hard"?? I agree you shouldn't ride it when it is lame or put it away wet though.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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    I wasn't rising it hard. It occurs under normal but full acceleration. I don't consider full throttle riding hard. I have had other turbo cars before. They were smoother. But it's not extreme, but a light definitely noticeable non smoothness. I don't have a boost gauge. Car is stock. Yes on maintenance.

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    Registered User 2002_wagon's Avatar
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    Well sorry I thought u said u ride it hard as in constant. Do u mean it feels like it hesitate. Or just when it transitions into boost
    278whp 286tq blouch 16g @ 17.5psi
    "My 02 wagon build" http://www.clubwrx.net/forums/everyd...gon-build.html
    Operation Iraqi Freedom x3
    WRX wagon MAFIA #68

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    No prob. Hesitation is a good way to describe it. Slight but noticeable.

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    Registered User 2002_wagon's Avatar
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    In all gears or just in 1st
    278whp 286tq blouch 16g @ 17.5psi
    "My 02 wagon build" http://www.clubwrx.net/forums/everyd...gon-build.html
    Operation Iraqi Freedom x3
    WRX wagon MAFIA #68

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    All gears

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    Registered User 2002_wagon's Avatar
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    Like if something was clogged?
    278whp 286tq blouch 16g @ 17.5psi
    "My 02 wagon build" http://www.clubwrx.net/forums/everyd...gon-build.html
    Operation Iraqi Freedom x3
    WRX wagon MAFIA #68

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    More like its not getting fuel maybe.

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    Registered User 2002_wagon's Avatar
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    Well sir I am no expert but I had a similar experience twice and it was caused by different things both times. Once was because a had a hairline rip in the hose that goes from the turbo to my boost seloniod and the other was a spark plug issue I really hope I are able to solve this have u checked all your hoses
    278whp 286tq blouch 16g @ 17.5psi
    "My 02 wagon build" http://www.clubwrx.net/forums/everyd...gon-build.html
    Operation Iraqi Freedom x3
    WRX wagon MAFIA #68

  14. #13
    Admiral Ackbar the 1st mycologist's Avatar
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    Hoses get old and crack, spark plugs wear out, fuel filters get clogged, etc., but this is a new car.....

    You are either just feeling the inconsistencies in the stock mapping (very likely and that is normal but can be improved), or your car is pulling timing due to a leak in the intake after the MAF but before the turbo, bad gas, etc. (which is bad long term). There are smoother maps available, although I can't recommend the cobb stage I as good to go after a recent set of logs I looked at.

    Or you have a boost control system leak or boost leak that is causing surging, which would be obvious to you and dramatic having owned previous turbos.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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    Registered User angelfox's Avatar
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    Been a while, any update on the "hesitations"?
    RayfieldsWRX - "You like the feel of torque steer? Interesting"
    jd92677 - "I like the idea of mashing the gas and not knowing which way the car will go."

  16. #15
    Registered User mark012sti's Avatar
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    I've been running into the same problem with my 2012 sti. It only happens when I'm on the highway and really get on the gas... Not so much on acceleration. Is this something I should be talking to the dealer about?

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