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Old 08-10-2014, 02:28 AM   #1
bbop25
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Default WRX acceleration power loss

Just made a dealer appointment in 2 weeks (need to wait for a dang loaner car!) for my 2015 WRX.

Last 2 weeks or so I've been experiencing a sudden power loss while on 80-100% throttle. Doesn't matter what gear. Generally happens around 4-5.5k rpms. Also hear a loud clank/rattle noise simultaneous to the power loss. Kind of like dragging a metal pole across concrete, or shaking coins in a metal can? or something like that. I think the noise is coming from the engine bay. Anyway, it feels like my car starts sputtering pretty badly.

Putting this note out there in case anyone else is feeling this or starting to feel it. We can post results or advice here.

Car is 100% stock btw and has 5.8k miles.
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Old 08-10-2014, 02:29 AM   #2
bbop25
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should note: it only happens maybe 10-20% of the time when I'm accelerating hard.
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Old 08-10-2014, 03:30 AM   #3
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Always the first thing you check, how much oil do you have?
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Old 08-10-2014, 10:02 AM   #4
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Thankfully you can bring it to the dealer and let the monkeys beat on it to "replicate" the issue, they'll love you.
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Old 08-10-2014, 10:15 AM   #5
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Quote:
Originally Posted by toph View Post
Thankfully you can bring it to the dealer and let the monkeys beat on it to "replicate" the issue, they'll love you.

http://carbuying.jalopnik.com/dealer...039291/+travis
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Old 08-10-2014, 10:33 AM   #6
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if i had these noises you say, id have a loaner or rental right now. you are gonna drive for 2 weeks like this? thats insane man.
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Old 08-10-2014, 10:46 AM   #7
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Could be this issue possibly?

http://forums.nasioc.com/forums/show....php?t=2654420


I'm having a similar problem except no noise really just sputtering and loss of power, as well as boost spikes.


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Old 08-10-2014, 11:21 AM   #8
simpleJ
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Power loss at the top end?? You don't say.....

The turbo is just running out of steam
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Old 08-10-2014, 11:32 AM   #9
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Quote:
Originally Posted by simpleJ View Post
Power loss at the top end?? You don't say.....

The turbo is just running out of steam

Kinda what I thought but boost never holds a steady psi so I believe it to be a slight leak, in my case anyways.


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Old 08-10-2014, 05:30 PM   #10
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Yes, same exact problem. When getting on the throttle hard (like when pulling out and passing slower cars going up long hill) felt a hard surging. Lots of power, then it suddenly goes away, come back, then gone again. I'm guessing they need to do a bit more tuning on the ecu, then they will put out a tsb for the problem with a ecu update.

It dosent do it all the time, it will be hard to replicate especially on city streets and didnt start doing it till we got over 7000 miles or so.
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Old 08-10-2014, 06:02 PM   #11
-vanguard-
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dat carbon build up already :P
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Old 08-10-2014, 08:33 PM   #12
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Quote:
Originally Posted by djjrok View Post
Always the first thing you check, how much oil do you have?
Oil is good

Actually just changed it within the past 500 miles or so too. Level is full.
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Old 08-10-2014, 08:35 PM   #13
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Quote:
Originally Posted by bobjr94 View Post
Yes, same exact problem. When getting on the throttle hard (like when pulling out and passing slower cars going up long hill) felt a hard surging. Lots of power, then it suddenly goes away, come back, then gone again. I'm guessing they need to do a bit more tuning on the ecu, then they will put out a tsb for the problem with a ecu update.

It dosent do it all the time, it will be hard to replicate especially on city streets and didnt start doing it till we got over 7000 miles or so.
Also, I started up my car this morning and someone behind me mentioned smoke was coming out of my pipes. Smoke was blue which means there might be an oil leak somewhere...
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Old 08-10-2014, 08:38 PM   #14
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Quote:
Originally Posted by Loyale93 View Post
THIS is what is making me weary of giving my car to a subi dealer. Last time I drove to the dealer to get a filter, all the guys were ohing and ahing at the car meaning they probably have not gotten a lot of them in thus far. If they have not gotten a lot in thus far, then I'm guessing their techs have not worked on many WRXs meaning they may feel more included to give it a little joy ride.

Not only that, but the power loss doesn't happen every time. It only happens some of the time meaning the Subi guys may be driving my car ridiculously hard for half an hour straight in order to 'pin down' exactly whats going on.

Anyway, gotta take it in and gotta push those thoughts to the back of my mind. Might be worrying for nothing.
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Old 08-11-2014, 10:26 PM   #15
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Quote:
Originally Posted by bbop25 View Post
Just made a dealer appointment in 2 weeks (need to wait for a dang loaner car!) for my 2015 WRX.

Last 2 weeks or so I've been experiencing a sudden power loss while on 80-100% throttle. Doesn't matter what gear. Generally happens around 4-5.5k rpms. Also hear a loud clank/rattle noise simultaneous to the power loss. Kind of like dragging a metal pole across concrete, or shaking coins in a metal can? or something like that. I think the noise is coming from the engine bay. Anyway, it feels like my car starts sputtering pretty badly.

Putting this note out there in case anyone else is feeling this or starting to feel it. We can post results or advice here.

Car is 100% stock btw and has 5.8k miles.
Exact same issue on my '15 WRX, but I've only got 200 miles on the OD. It's in the shop now for this and a few other issues (rattles, rattles, and more rattles). We'll see what they have to say about the boost drop-off. It's really strange as I have none of this behavior on my XT.
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Old 08-11-2014, 10:30 PM   #16
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Not so much that the turbo is running out of steam so much as it's holding the steam constant and you're not getting variable acceleration that comes from a top range tuned car. You get your big torque hit and that's it. No linear increase.
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Old 08-12-2014, 12:27 AM   #17
mishapopa
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If I have this issue with my car I'm selling it and getting a Honda. Not willing to put up with this kind of **** on a brand new car.
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Old 08-18-2014, 06:30 PM   #18
Piper
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Quote:
Originally Posted by Piper View Post
Exact same issue on my '15 WRX, but I've only got 200 miles on the OD. It's in the shop now for this and a few other issues (rattles, rattles, and more rattles). We'll see what they have to say about the boost drop-off. It's really strange as I have none of this behavior on my XT.
No joy. Dealer found nothing abnormal with the acceleration, and no codes. Not sure how this is the case, as the acceleration is rather skittish with its abrupt loss of power right in the middle of the power band - on, off, than on again right in the middle of the boost.

Last edited by Piper; 03-15-2015 at 06:44 PM.
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Old 08-18-2014, 07:12 PM   #19
-vanguard-
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Theres nothing wrong, thats how everyone's wrx is. Its a bumpy power curve.

Mine also never holds psi steady and it fluctuates from 15-20 when im WOT.

Apparently cobbs stage 1 tune gets rid of that nonsense.
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Old 08-18-2014, 07:25 PM   #20
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Quote:
Originally Posted by bbop25 View Post
Also, I started up my car this morning and someone behind me mentioned smoke was coming out of my pipes. Smoke was blue which means there might be an oil leak somewhere...
Massive amounts of smoke randomly billowing out of the exhaust on startup is a right of passage for any new WRX owner.

You were romping on it the last time you drove it, parked it, oil collected somewhere it shouldn't have, and poof, huge smoke show on startup.
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Old 08-18-2014, 07:26 PM   #21
Piper
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Quote:
Originally Posted by -vanguard- View Post
Theres nothing wrong, thats how everyone's wrx is. Its a bumpy power curve.

Mine also never holds psi steady and it fluctuates from 15-20 when im WOT.

Apparently cobbs stage 1 tune gets rid of that nonsense.
Mine actually drops to 0 psi before spiking back up
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Old 08-18-2014, 07:30 PM   #22
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Quote:
Originally Posted by Piper View Post
Mine actually drops to 0 psi before spiking back up
This is normal while shifting, not while in gear.
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Old 08-18-2014, 07:55 PM   #23
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Yep, unfortunately it happens while in gear and pulling hard. Just drops to 0 psi (talking a fraction of a second here) before returning to full boost.
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Old 08-18-2014, 07:59 PM   #24
-vanguard-
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Thats weird. Could need a ECU reflash or the gauge just isn't reading correctly.
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Old 08-18-2014, 08:09 PM   #25
Piper
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Quote:
Originally Posted by -vanguard- View Post
Thats weird. Could need a ECU reflash or the gauge just isn't reading correctly.
Not a gauge problem as I can feel the boost drop-off. More research is required on my part, but I'm leaning toward an issue with the tune. FWIW, this problem doesn't exists on my XT.

Last edited by Piper; 03-15-2015 at 06:45 PM.
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