wrx doesnt accelerate smoothly
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This is a discussion on wrx doesnt accelerate smoothly within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; ever since i bought my car I has not accelerated smoothly. If I'm just driving normaly and then I step ...

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    Red face wrx doesnt accelerate smoothly

    ever since i bought my car I has not accelerated smoothly. If I'm just driving normaly and then I step on it i sometimes kicks or bogs before giving some power and sometimes there isn't alot of power. i also noticed that you can sometimes hear some kind of ticking/crackling sound from the engine in the 6,000-7000 rpms when the window is open (1st and 2nd gears). Could this be the sparkplugs. it has about 40,000 miles on it. Also the guy I bought it from blew a piston in it but had it rebuilt at the subaru dealer, if that helps. Can some one PLEASE HELP ME? THANKS!!!

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    Sammich Makin' Pwincess wrxtreme06's Avatar
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    Quote Originally Posted by thevlad View Post
    ever since i bought my car I has not accelerated smoothly. If I'm just driving normaly and then I step on it i sometimes kicks or bogs before giving some power and sometimes there isn't alot of power.
    your not really giving too much info to go on.

    for argumentsake, if i'm in 4th gear going 40 mph, if i slam on the gas, my cars not going ANYWHERE for like 2-3 seconds unless i downshift to be in the proper gear for the designated speed i'm going at.


    please give us more details on your problem

    1) when does it happen
    2) what gear are you in
    3) how fast are you going
    4) what rpm range are you in while you "step on it"

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    Registered User JUSTINSNUTSWINGER's Avatar
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    Are you running any type of engine management?
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    Registered User ElBartoRex's Avatar
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    if this is your first turbo car you are just experiencing the lag and the somewhat narrow powerband of the WRX.
    Current: 05 Mini Cooper S R53
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    Or do you also have a dirty MAF that needs to be cleaned?

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    Registered User JUSTINSNUTSWINGER's Avatar
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    Before I got my AP I experienced the rough acceleration as well. a tune helped as well. Then again... I don't think the REX has a narrow powerband..... 2.8-5.8 ?? Not wide, but not narrow.

    Also, what year..... and why are you running the RPM's up to 6-7 anyways ?
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    i'm not running any engine management and it's not the lag. My brother used to have a wrx and it was smooth and fast. Mine is a stock 04wrx with catback exhaust, and when i say step on it, i mean from 2500-3500rpms in 1st-3rd gears . I know there is turbo lag, but once the turbo really kicks in the acceleration still is not smooth like its suppose to be. Its like the power is just bouncing around. If I accelerate slowly there is no problem, How do you clean the MAF sensor and where is it? Could it be a tune that I need because the guy before me said he did have some light mods including an sti shortblock, but it now has its original wrx shortblock.

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    Quote Originally Posted by pzr2874 View Post
    Before I got my AP I experienced the rough acceleration as well. a tune helped as well. Then again... I don't think the REX has a narrow powerband..... 2.8-5.8 ?? Not wide, but not narrow.

    Also, what year..... and why are you running the RPM's up to 6-7 anyways ?
    Whats an AP?

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    Administrator TheJ's Avatar
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    Quote Originally Posted by thevlad View Post
    i'm not running any engine management and it's not the lag. My brother used to have a wrx and it was smooth and fast. Mine is a stock 04wrx with catback exhaust, and when i say step on it, i mean from 2500-3500rpms in 1st-3rd gears . I know there is turbo lag, but once the turbo really kicks in the acceleration still is not smooth like its suppose to be. Its like the power is just bouncing around. If I accelerate slowly there is no problem, How do you clean the MAF sensor and where is it? Could it be a tune that I need because the guy before me said he did have some light mods including an sti shortblock, but it now has its original wrx shortblock.
    MAF Mass-Air-Flow sensor
    This pic is a Subie with the a short ram intake the green arrow points to the MAF Sensor. If your instake is stock you will still have the MAF somewhere there. It's not too hard to find.



    A dirty and/or oily MAF can definitely give you problems but it is not too hard to clean. Just handle the MAF with care.

    Quote Originally Posted by thevlad View Post
    Whats an AP?
    AP = Access Port It's for Tunning/Remapping the engine ECU
    Last edited by TheJ; 09-07-2008 at 02:56 AM.
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    Admiral Ackbar mycologist's Avatar
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    Crackling like marbles bouncing around sort of?

    I think you may have serious issue with detonation.
    "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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    Administrator TheJ's Avatar
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    Quote Originally Posted by mycologist View Post
    Crackling like marbles bouncing around sort of?

    I think you may have serious issue with detonation.
    +1 Yeah that doesn't sound very good. Also, switching the engine block isn't exactly what I would call a "light mod"...
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    Quote Originally Posted by mycologist View Post
    Crackling like marbles bouncing around sort of?

    I think you may have serious issue with detonation.
    I cleaned the MAF sensor and it still has the same problem. And I guess it might sound like marbles bouncing around. I just drove it after cleaning the MAF sensor and I could basically hear it at 5,000+ rpm in every gear. Is there any way to fix it if it is a detonation issue or am I screwed?

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    Registered User JUSTINSNUTSWINGER's Avatar
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    Do an upper cylinder cleaning. Still on the same tank of gas ?
    N-swinger

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    Registered User etshulda's Avatar
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    The acceleration in my old 04 rex was far from smooth, and I bought the car new. The sound you're hearing may simply be wastegate flutter, I hear it in my STi often...it sounds kind of like running over a soda can. I've heard that flashing to stage 1 will eliminate the acceleration issue.
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    Quote Originally Posted by etshulda View Post
    The acceleration in my old 04 rex was far from smooth, and I bought the car new. The sound you're hearing may simply be wastegate flutter, I hear it in my STi often...it sounds kind of like running over a soda can. I've heard that flashing to stage 1 will eliminate the acceleration issue.
    Yeah, it does sound more like running over a soda can. I guess I have to flash to stage one then. Will a performance shop know what I'm talking about if I tell them to flash to stage 1?

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