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wheeler 07-20-2009 03:50 PM

09 WRX Power Surge
Hello, I have a stock 09 WRX and ever since new (about 6 months) has a couple things that may be related, that I noticed that don't seem normal to me

1) Below 3500 rpm the car does not pull that hard and then at 3500 rpm it is like a SOB. I understand that the turbo is not making any real boost a low engine speeds but is it normal to have it come on all at once at 3500 rpm? It is almost hard to drive with this sudden surge of power right at 3500 rpm....

2) Occansionly, during hard acceleration, the power drops out / or is reduced momentary (about 1 second). I dont know why this occours but feels like the boost dropped suddenly (just my guess). This happens well below redline (3000-5500 rpm). Anyone else have this happen? I did read of some similar problems on this site, but all seemed to be related to aftermarket parts or incorrect tuning.

Thanks for any help on this topic

booosted09 07-20-2009 04:52 PM

well the power surge at 3500 rpm is just when your turbo is fully spooled...its a bigger turbo than on previous WRX's so there is a lot more lag...As for the power dropping off in that rev range, i haven't had that drops off right before redline but thats normal.

baller_v24 07-20-2009 04:53 PM

sounds like turbo lag to me. Does it do that when you downshift or try to gun it while in the 3000-5500rpm? Does it do the same when you try to gun it when you try accelerating at about 2500 or less rpms?

booosted09 07-20-2009 04:59 PM

[quote=baller_v24;226844]sounds like turbo lag to me. Does it do that when you downshift or try to gun it while in the 3000-5500rpm? Does it do the same when you try to gun it when you try accelerating at about 2500 or less rpms?[/quote]
I get real quick response when i'm at 3000-5500 lag at all....its just on the 09's when your below the "party zone"(3500-6500rpm)these things just lag like a bastard. i just dont know about the drop in power. :confused:

wheeler 07-20-2009 05:19 PM

Thanks for the responses; Well lag i guess explains the sudden increase in power at 3500 rpm, it does not explain the intermittent loss of power. This occurs after peak boost is reached (or near peak) and well before redline. Does the engine ecu have a way of controlling boost, maybe momentarily reducing it for emissions? or to reduce intake temperatures?

03 CrazyTaxi 07-20-2009 08:27 PM

Almost sounds like it's overboosting or surging. Does it feel like you hit a brick wall or is more of a pulsing feeling?

turmic 07-21-2009 09:32 AM

Or is he talking about the way the boost falls off before redline? That he feels a power loss before redline. I mean that's normal and you can't really change that.

wheeler 07-21-2009 12:40 PM

Its more of of a surge or a very quick shutter, power drops for less than a second and then returns again. It happens about every other hard acceleration during every hard aceleration but about. It is not the power tappering off near redline, this happens at lower engine speeds and feels like a valve (may be wastgate) cracks open and bleeds off most of my boost - just a guess.

booosted09 07-21-2009 04:07 PM

i would just take it to the dealership and have them check it dont have any mods do you? if not, it cant hurt to have them take a look.

03 CrazyTaxi 07-21-2009 08:32 PM

Def. take it in to the dealer, sounds like the wastegate may be dying.

danrcv 11-12-2009 10:02 PM

I have a 2010 WRX with this same problem since new. I am taking it in on Monday to the dealership. I know exactly the feeling you are getting. Power comes on around 3-4000 rpm then hesitates very slightly around 5000 then comes back on around 5500-redline. I have used Shell and Mobil (91 octane of course)and the problem is a bit more noticeable with Mobil. Its weird, it feels like the throttle is fluctuating. I will report back when I get the car back from the dealership.

turmic 11-16-2009 12:52 PM

It could just be a crap section in the stock map. That the car craps out for a second....who knows. Lets us know what you find.

booosted09 11-16-2009 03:37 PM

+1 to Turmic.......I talked to a guy who has a 09 that is completely stock except he took it and had it tuned. It is the stock map. The way Subaru set it up sucks....After the tune he said it dosent do it at all. Its real smooth through the rev's

danrcv 11-23-2009 10:52 PM

So the dealership said they found nothing unusual but if it still does it when I get 6,000 miles on the car to bring it back in. I was also informed that Subaru does not have an ECU update flash yet.

boosted09, what did the guy use to tune his car? Cobb?

JPGC 11-29-2009 10:15 PM

My 09 WRX does the same thing. It has 1150 miles on it. I am very curious on what it is. My car has done it from the day I left the dealership. I will pull really hard from 3500 to 5000, then at 5000 feels like it misses for a second, then pulls again.

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