Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

09 Impreza 2.5i mods for performance and power? (not WRX)


  • Please log in to reply
2 replies to this topic

#1 Jared Burroughs

Jared Burroughs

    Newbie

  • Members
  • Pip
  • 1 posts
  • Chula Vista, CA

Posted 20 March 2017 - 12:11 AM

What Modifications can i make to my 09 2.5i Impreza for more power and better performance? would it be best to swap for the sti engine or just put a turbo on the engine i have now?



#2 idosubaru

idosubaru

    Elite Master of the Subaru

  • Members
  • 23,426 posts
  • East Coast

Posted 20 March 2017 - 08:01 AM

nope, that's like putting a better exhaust on your horse and hoping it runs faster. not quite that bad, but closer than the other way round - lots of effort for tiny gains.

It depends though - if you want actually fast 0-60 times then it's true. If you just like to tinker yourself and play as a hobby, or want to feel or look or talk about being faster with a few friends, or have a list of mods to put in signatures and Facebook, with small gains then do whatever you want - custom exhaust, lightweight pulleys, significant weight reduction, lower the vehicle, lightweight wheels and tires, see if anyone is doing higher stall torque converters or valve bodies for CVTs if that's what you have, remove your AC system. Then you're in a couple thousand dollars with meager gains and still getting killed at the track.

NA (normally aspirated) engines don't respond like FI (forces induction) engines due to basic laws of physics, people are under the misconception that "mods make more power". That's inaccurate. "Mods on turbo engines make more power" is accurate. They respond drastically, but your engine does not.

So yes a complete turbo swap is in order. That will most likely require a complete custom ECU controller and tuning which is highly involved and technical.

I'd just buy a turbo vehicle, much simpler and cheaper.

Edited by grossgary, 20 March 2017 - 08:02 AM.


#3 AdventureSubaru

AdventureSubaru

    Subaru Fanatic!

  • Members
  • 2,028 posts
  • Grand Valley, PA

Posted 20 March 2017 - 08:20 AM

What he said. Subaru did their job very well. You wont really improve much. Best you can do as is would be to reduce weight. Clean out your trunk, delete the AC etc.

 

A turbo on your existing motor means brief HP gains up until you blow the motor. Not a realistic option.

 

Simple way is to sell this car and buy a turbo model. If you're stuck on this car the realistic way to gain power is a motor swap.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users