Welcome to the North American Subaru Impreza Owners Club Saturday August 30, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Subaru Models > Impreza Forum

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads.
Reply
 
Thread Tools Display Modes
Old 08-18-2014, 01:25 PM   #1
puf_the_majic_dragon
Scooby Newbie
 
Member#: 210460
Join Date: May 2009
Vehicle:
2012 Impreza
Gray

Default 2012 Impreza performance help

I used to own an 04 Impreza Outback Sport and loved that car, but had to sell it. Last November I bought a 2012 without realizing how badly Subaru had neutered the Impreza. Engine volume and HP have been cut significantly. I feel like I'm driving a boat that's still strapped to the trailer. Especially in first gear, there's absolutely no power; it literally feels like I'm hauling a horse trailer with a Power Wheels car.

So do I have any options to improve performance? If I open up the intake for better airflow, how much of an increase in HP can I expect on stock injectors? At the most extreme, is it possible to swap out a WRX motor? (I have family in the salvage business that should be able to help me find a motor.)

I'm just trying to find out if there's anything I can do or if I should start planning on trading it in for a WRX, in spite of my dislike for turbo lag. If I have options to improve performance, I'd like to explore them first.
* Registered users of the site do not see these ads.
puf_the_majic_dragon is offline   Reply With Quote
Old 08-18-2014, 01:53 PM   #2
sgoldste01
Scooby Specialist
 
Member#: 322264
Join Date: Jun 2012
Chapter/Region: Tri-State
Location: Webster, NY
Vehicle:
2012 Impreza Sp 5sp
Obs Blk Prl/Drk Gray Mtl

Default

Trade it in for a WRX, preferably a 2015 model.
sgoldste01 is offline   Reply With Quote
Old 08-18-2014, 02:08 PM   #3
Commander Keen
Scooby Specialist
 
Member#: 319157
Join Date: May 2012
Chapter/Region: MAIC
Vehicle:
2012 Impreza 4DR 5MT

Default

The 2012 is actually faster than the previous generation, despite the loss of power and displacement.

You have to keep the revs up for the engine to breathe. If you expect to shift it like an EJ25, you will be disappointed.
Commander Keen is online now   Reply With Quote
Old 08-18-2014, 02:26 PM   #4
Angelus911
Scooby Specialist
 
Member#: 89967
Join Date: Jun 2005
Chapter/Region: NESIC
Location: MA
Vehicle:
2012 Impreza Sport
DGM

Default

Quote:
Originally Posted by sgoldste01 View Post
Trade it in for a WRX, preferably a 2015 model.
+1
Angelus911 is offline   Reply With Quote
Old 08-18-2014, 02:30 PM   #5
lymphomaniac
Scooby Specialist
 
Member#: 334451
Join Date: Oct 2012
Chapter/Region: VIC
Location: YVR
Vehicle:
2013 Impreza2.0i CVT
DGM (sedan)

Default

Quote:
Originally Posted by sgoldste01 View Post
Trade it in for a WRX, preferably a 2015 model.
I've heard that the turbo lag on that model is also minimized.
lymphomaniac is offline   Reply With Quote
Old 08-18-2014, 02:47 PM   #6
puf_the_majic_dragon
Scooby Newbie
 
Member#: 210460
Join Date: May 2009
Vehicle:
2012 Impreza
Gray

Default

Quote:
Originally Posted by Commander Keen View Post
The 2012 is actually faster than the previous generation, despite the loss of power and displacement.

You have to keep the revs up for the engine to breathe. If you expect to shift it like an EJ25, you will be disappointed.
The top speed may be higher, but the low-end acceleration is awful. And it's that first gear that you need to move when you're trying to squeeze into heavy city traffic. It's an automatic (w/ paddle shifters), so I can't keep the RPMs up for that first gear acceleration unless I neutral drop it (and I'm not even going to try that once). Right now the only thing I know for sure is I can get a small (but currently unquantified) boost to HP by improving the intake airflow.

If it's possible to drop an EJ25 into the chassis, I can make it happen. I just don't know if it'll bolt in (and I assume it won't).
puf_the_majic_dragon is offline   Reply With Quote
Old 08-18-2014, 03:05 PM   #7
Commander Keen
Scooby Specialist
 
Member#: 319157
Join Date: May 2012
Chapter/Region: MAIC
Vehicle:
2012 Impreza 4DR 5MT

Default

By "faster", I meant better acceleration.

I don't know if it has been done, but I would look into swapping an FB25 before an EJ25.

If you need an occasional boost, a lower output wet N2O system could make the car more tolerable. I don't know if this has been done either.
Commander Keen is online now   Reply With Quote
Old 08-18-2014, 03:14 PM   #8
lymphomaniac
Scooby Specialist
 
Member#: 334451
Join Date: Oct 2012
Chapter/Region: VIC
Location: YVR
Vehicle:
2013 Impreza2.0i CVT
DGM (sedan)

Default

The CVT logic is malleable. Have you tried using M-mode to help it learn your driving style yet?
lymphomaniac is offline   Reply With Quote
Old 08-18-2014, 03:43 PM   #9
puf_the_majic_dragon
Scooby Newbie
 
Member#: 210460
Join Date: May 2009
Vehicle:
2012 Impreza
Gray

Default

Quote:
Originally Posted by lymphomaniac View Post
The CVT logic is malleable. Have you tried using M-mode to help it learn your driving style yet?
I have noticed that, where if I drive extra hard one day then shifting is delayed accordingly the next day. But haven't made an effort to consciously teach it. My biggest concern is first gear. When I'm at a stop sign waiting to turn into heavy traffic, I want instant responsiveness and fast acceleration in order to pull into the first opening I see. So far I haven't seen any indications that the transmission can auto-adjust first gear, though it will adjust the shift point for 2nd on up.
puf_the_majic_dragon is offline   Reply With Quote
Old 08-18-2014, 03:46 PM   #10
soobie doo
Scooby Newbie
 
Member#: 324017
Join Date: Jun 2012
Location: Philly Burbs
Vehicle:
2012 Impreza 2.0i
Ice Silver Metallic

Default

Intake won't do you any good, the stock one is already very good.

There's an Australian company making a supercharger kit for the XV, I'd assume it would also work for the Impreza. They say 140 kw (~187 hp) at the crank for the kit that's currently available. http://www.raptorsc.com.au/subaru8.html

Within a couple of years, there should be some 2015+ WRX engines out on the market if you want to do an engine swap.
soobie doo is offline   Reply With Quote
Old 08-18-2014, 03:54 PM   #11
v_khotsky
Scooby Newbie
 
Member#: 303995
Join Date: Dec 2011
Chapter/Region: E. Canada
Location: Toronto
Vehicle:
2012 Impreza STI
2006 Yamaha YZF-R1

Default

Trade it in , and get WRX or STI , much less pita


Sent from my iPhone using NASIOC
v_khotsky is offline   Reply With Quote
Old 08-18-2014, 04:09 PM   #12
CLL_OBP
Scooby Specialist
 
Member#: 310435
Join Date: Feb 2012
Location: Fayettenam, NC
Vehicle:
2012 Sport Limited
Obsidian Black Pearl

Default

Quote:
Originally Posted by puf_the_majic_dragon View Post
Last November I bought a 2012 without realizing how badly Subaru had neutered the Impreza. Engine volume and HP have been cut significantly.
Did the test drive not reveal this, did you ignore it and bought it anyway or did you not do a test drive? IMO, I don't think it's as bad as you described but I'd get rid of it before trying to swap engines in a late model car.

Sent from my SAMSUNG-SGH-I337 using NASIOC mobile app
CLL_OBP is offline   Reply With Quote
Old 08-18-2014, 04:24 PM   #13
puf_the_majic_dragon
Scooby Newbie
 
Member#: 210460
Join Date: May 2009
Vehicle:
2012 Impreza
Gray

Default

Quote:
Originally Posted by CLL_OBP View Post
Did the test drive not reveal this, did you ignore it and bought it anyway or did you not do a test drive? IMO, I don't think it's as bad as you described but I'd get rid of it before trying to swap engines in a late model car.
I did notice the lack of power in the test drive, but I assumed it was just a matter of tuning the ECU. My friend had just gotten a sales job at a Toyota dealership and I wanted to give him a leg up at his new job. It only helped that they had an Impreza traded in that very week. If I had kept shopping and driven a few other cars, I probably would have realized the drop in engine volume and horsepower and gotten a WRX instead. I don't regret helping my friend out by buying a car from him. I do regret not educating myself about the later model Imprezas before making that decision.
puf_the_majic_dragon is offline   Reply With Quote
Old 08-18-2014, 04:31 PM   #14
sgoldste01
Scooby Specialist
 
Member#: 322264
Join Date: Jun 2012
Chapter/Region: Tri-State
Location: Webster, NY
Vehicle:
2012 Impreza Sp 5sp
Obs Blk Prl/Drk Gray Mtl

Default

Does using the paddles help?
sgoldste01 is offline   Reply With Quote
Old 08-18-2014, 04:47 PM   #15
flyboy1100
Scooby Specialist
 
Member#: 314216
Join Date: Mar 2012
Location: ND
Vehicle:
2012 2.0i Sport 5MT
DGM

Default

Quote:
Originally Posted by puf_the_majic_dragon View Post
I did notice the lack of power in the test drive, but I assumed it was just a matter of tuning the ECU. My friend had just gotten a sales job at a Toyota dealership and I wanted to give him a leg up at his new job. It only helped that they had an Impreza traded in that very week. If I had kept shopping and driven a few other cars, I probably would have realized the drop in engine volume and horsepower and gotten a WRX instead. I don't regret helping my friend out by buying a car from him. I do regret not educating myself about the later model Imprezas before making that decision.
Car also weighs quite a bit less. So the power to weight is actually better. Can't just look at the numbers, 20hp/tq isn't a huge difference

I find if I am first in the line I usually out accelerate everyone else.
flyboy1100 is offline   Reply With Quote
Old 08-18-2014, 04:54 PM   #16
puf_the_majic_dragon
Scooby Newbie
 
Member#: 210460
Join Date: May 2009
Vehicle:
2012 Impreza
Gray

Default

Quote:
Originally Posted by flyboy1100 View Post
Car also weighs quite a bit less. So the power to weight is actually better. Can't just look at the numbers, 20hp/tq isn't a huge difference

I find if I am first in the line I usually out accelerate everyone else.
Then maybe there's something wrong with mine because I have serious acceleration problems, especially in first gear.

I did a little reading on the CVT after Lymphomaniac's post. Apparently it is programmable. Might be worth stopping by the Subaru dealer.
puf_the_majic_dragon is offline   Reply With Quote
Old 08-18-2014, 04:56 PM   #17
foghelmut
Scooby Newbie
 
Member#: 328414
Join Date: Aug 2012
Location: South Jersey
Vehicle:
2012 Impreza SP 5MT
obsidian pearl black

Default

The general rule is that naturally aspirated Subarus are about as good as they're going to get. No room for any type of power improvement. You're better off buying a WRX.
foghelmut is offline   Reply With Quote
Old 08-18-2014, 05:04 PM   #18
lymphomaniac
Scooby Specialist
 
Member#: 334451
Join Date: Oct 2012
Chapter/Region: VIC
Location: YVR
Vehicle:
2013 Impreza2.0i CVT
DGM (sedan)

Default

Another possibility - maybe it's a pedal position vs. throttle mapping issue?

Nonetheless, it's probably worth your while to stop by the Subaru dealer nearest you to let them have a look at it. Hope it works out.

One more thing: do you know of anyone else in your area who has the same setup as you? Maybe test drive theirs to see if they have the same response issues.
lymphomaniac is offline   Reply With Quote
Old 08-18-2014, 06:21 PM   #19
MA83
Scooby Newbie
 
Member#: 390726
Join Date: May 2014
Location: Broomfield, CO
Vehicle:
2014 2.0i 5DR 5SPD
Quartz Blue Pearl

Default

You're number one problem IMO was getting the CVT. I've got the 5spd and I have no problems. The CVT keeps revs lower to aide in MPG. With the manual I can keep it in the power curve and the 150 ponies actually move this little car surprisingly well.
MA83 is offline   Reply With Quote
Old 08-18-2014, 06:29 PM   #20
millertime359
Scooby Newbie
 
Member#: 393302
Join Date: Jun 2014
Location: Holland, MI
Vehicle:
2014 Impreza Sport

Default

Honestly, it's an econobox. I don't have an issue with acceleration in my '14 w/CVT. I actually just did a right hand turn from dead stop into traffic going 55. It was a tighter hole than I normally prefer, but still got it up to speed with no issues. Had to hit about 3/4 throttle to do it.

Honestly, if your looking for WRX performance, then sell it or trade it in on a WRX.

You can loosen up an extra couple of horsepower by swapping the exhaust and messing with the intake. There are a couple of guys looking into tunes, but end of day, I doubt you are going to get any more than 10 HP and it would cost you a few grand to get that.
millertime359 is offline   Reply With Quote
Old 08-18-2014, 06:50 PM   #21
sgoldste01
Scooby Specialist
 
Member#: 322264
Join Date: Jun 2012
Chapter/Region: Tri-State
Location: Webster, NY
Vehicle:
2012 Impreza Sp 5sp
Obs Blk Prl/Drk Gray Mtl

Default

Quote:
Originally Posted by MA83 View Post
You're number one problem IMO was getting the CVT. I've got the 5spd and I have no problems. The CVT keeps revs lower to aide in MPG. With the manual I can keep it in the power curve and the 150 ponies actually move this little car surprisingly well.
Couldn't agree more.
sgoldste01 is offline   Reply With Quote
Old 08-18-2014, 06:52 PM   #22
Thefifth
Scooby Newbie
 
Member#: 389497
Join Date: Apr 2014
Default

>Buys eco 2.0 PZEV car with AWD
>complains slow

Can we seriously stop with these threads?
Thefifth is offline   Reply With Quote
Old 08-18-2014, 07:03 PM   #23
puf_the_majic_dragon
Scooby Newbie
 
Member#: 210460
Join Date: May 2009
Vehicle:
2012 Impreza
Gray

Default

Quote:
Originally Posted by millertime359 View Post
Honestly, it's an econobox. I don't have an issue with acceleration in my '14 w/CVT. I actually just did a right hand turn from dead stop into traffic going 55. It was a tighter hole than I normally prefer, but still got it up to speed with no issues. Had to hit about 3/4 throttle to do it.

Honestly, if your looking for WRX performance, then sell it or trade it in on a WRX.
I don't expect it to perform like a WRX. But I think I ought to expect its performance to compare somewhat closely to my 30 year old 300zx - 160 bhp+30 years of wear. The fact that there is simply no comparison is worrisome, especially with accounts like yours that suggest that I should be getting more performance out of this car.

Quote:
Originally Posted by Thefifth View Post
>Buys eco 2.0 PZEV car with AWD
>complains slow

Can we seriously stop with these threads?
I was traveling this weekend and had a 2014 Camry rental. 268 HP v6 with a CVT. It still got 40+ MPG. Tell me again how the 30MPG [148 HP] Impreza is "Eco".

Besides, the accounts I've gotten in this thread of other drivers' experiences strongly indicate that I might have a mechanical problem. You might think this thread inane, but I find it extremely helpful and I thought that's what these forums were for.

Last edited by puf_the_majic_dragon; 08-18-2014 at 07:19 PM.
puf_the_majic_dragon is offline   Reply With Quote
Old 08-18-2014, 07:31 PM   #24
millertime359
Scooby Newbie
 
Member#: 393302
Join Date: Jun 2014
Location: Holland, MI
Vehicle:
2014 Impreza Sport

Default

Quote:
Originally Posted by puf_the_majic_dragon View Post
I don't expect it to perform like a WRX. But I think I ought to expect its performance to compare somewhat closely to my 30 year old 300zx - 160 bhp+30 years of wear. The fact that there is simply no comparison is worrisome, especially with accounts like yours that suggest that I should be getting more performance out of this car.
It's hard to say without actually driving the car. I came from a '13 Focus Ti hatchback with the Dual Dry Clutch. There shouldn't have been any difference as they both are roughly the same power to weight ratio. The Focus did behave differently as it had the different transmission, but it wasn't faster by anything noticeable.

I would honestly go to your local dealer and see if they have a '14 CVT on the lot and see if they will let you test drive it. See if it is as fast as your '12. That should be able to help you understand if it is your car or if your expectations are a little to high.
millertime359 is offline   Reply With Quote
Old 08-18-2014, 08:48 PM   #25
Tha Chakal
Scooby Specialist
 
Member#: 372100
Join Date: Oct 2013
Location: D.C.
Vehicle:
2013 Premium 5dr CVT
DGM

Default

Quote:
Originally Posted by puf_the_majic_dragon View Post
Then maybe there's something wrong with mine because I have serious acceleration problems, especially in first gear.

I did a little reading on the CVT after Lymphomaniac's post. Apparently it is programmable. Might be worth stopping by the Subaru dealer.
The CVT does seem to bog down when you mash the accelerator, but a gradual application always works for me. I personally have no problem with acceleration, I'm almost always the first guy off the line, too

The only time I ever notice a lack of power is when I'm going highway speeds (65+) up a steep incline, I'm forced to lose momentum because someone slower gets in front of me and I try to get back up to speed, and it's still not that bad.

FWIW, There were a few guys a while ago complaining that when you accelerate by giving it a constant 30-50% throttle and holding it, that it would get to 40 mph and upshift, bogging down and turning into a slug. I also experienced this and asked the lead tech at my dealership about 'tuning' it to act different. He said that he could reset the ECU and take it out and program it differently. I really didn't want to do that, at least not immediately, so I decided to 'teach' it myself. Every time I got into that situation, I would give it a little extra throttle before reaching 40 and then gradually let off after it started going over. Worked like a charm.

P. S. There IS a guy swapping a '13 STI motor on reddit...
Tha Chakal is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 02:15 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.