Phinx6236 Posted November 6, 2017 Share Posted November 6, 2017 I am looking to turbo charge my 2010 Legacy 2.5 Premium for as affordable as possible. I was wondering what would the best way be. I was recommended that used gt parts would be a great start. I was also wondering if any of the sti/wrx parts are interchangeable with the legacy gt. From what I gathered I would need a turbo, exhaust, inter cooler, blow off valve, intake, oil lines and coolant lines. Would you suggest anything else? I was looking more for stock parts because I know a lot of after market parts might be stronger than my engine can handle. Link to comment Share on other sites More sharing options...
FJuan Posted November 6, 2017 Share Posted November 6, 2017 As many members are going to tell you, don't do it and buy a GT instead. You will not be able to turbo charge a 2.5i on an affordable budget. There's more involved like swapping ECUs and cable harnesses, then having the car tuned to make everything work right. Besides, is the cost worth it to you to only gain between 30 - 50 hps with only 5 - 7 lbs of boost. The 2.5i compression is not designed to be turbo charged. My wife's balls are delicious. Link to comment Share on other sites More sharing options...
Notorious Posted November 6, 2017 Share Posted November 6, 2017 I’ve owned a 2.5i before and trust me, it is more worth while to spend your money elsewhere. Buy suspension mods and you’ll have way more practical fun in your car whereas if you went through with the turbo conversion you still wouldn’t match the hp of an older stock WRX you could’ve bought with the same amount of money. Link to comment Share on other sites More sharing options...
ToRealEyes Posted November 8, 2017 Share Posted November 8, 2017 These guys (and sometimes FJuan) speak truth. It's mighty complicated, and people have been asking this question since the first appearance of the EJ253. We have the last generation EJ253, and as for power, Subaru has mostly milked it for all its worth (170hp/170tq), flat torque curve, etc. If you can justify the expense and downtime, then please do it and remember to post your build! You'll need to address fueling as well. Stock fuel pump/injectors won't be adequate for a turbo application. Link to comment Share on other sites More sharing options...
FJuan Posted November 9, 2017 Share Posted November 9, 2017 These guys (and sometimes FJuan) speak truth. :lol: My wife's balls are delicious. Link to comment Share on other sites More sharing options...
Phinx6236 Posted November 9, 2017 Author Share Posted November 9, 2017 Thanks everyone I came from a turbo car and I just missed it. What would be more practical ways to boost horsepower? ECU performance chip? and cold air intake? I would like the most bang for my buck. Link to comment Share on other sites More sharing options...
Moderators BarManBean Posted November 9, 2017 Moderators Share Posted November 9, 2017 There's no decent "bang for your buck" modifications to increase power on a 2.5i Subaru. Don't bother. "Bullet-proof" your OEM TMIC! <<Buy your kit here>> Not currently in stock Link to comment Share on other sites More sharing options...
ArmyVetMP Posted November 9, 2017 Share Posted November 9, 2017 I also have a 2010 Legacy 2.5i Premium. At this point in time, with the car being 7-8 years old, adding a turbo would most likely be a death warrant to the vehicle. As noted above, the 2.5i engine's are not made to handle the compression needed with a turbo set up. With the age of the motor, things would most likely begin to fail at a much quicker rate with the added stress. I would do other mechanical upgrades to the Suspension, etc. to upgrade the ride quality and make the vehicle more fun in that manner. I love my Legacy, which for the most part has been a solid, reliable vehicle. The only issues I have had in my time of ownership (bought it used with 28k miles on it, now have over 175k on it) is I had to have the Torque Converter replaced (reimbursed by Subaru for this $1500 repair), replaced the Battery (expected after 5+ years), Oil Consumption (1qt every 1000 miles or so), and the routine maintenance things (Timing Belt, Brake Pads/Rotors, Tires, various fluids, etc) Link to comment Share on other sites More sharing options...
xtea Posted November 9, 2017 Share Posted November 9, 2017 Sell the car use as downpayment on wrx. Consider your monthly payment cheaper then the cost for modding. Link to comment Share on other sites More sharing options...
pjcampbell Posted November 28, 2017 Share Posted November 28, 2017 People have done this before with "success" however keep in mind the power limit on 93 octane gas is around 200 whp. It is not bad power, but it is what it is. I would recommend checking out the Avo turbo kit if you want a turbo or Raptor Supercharger kit if you want a supercharger. No ECU swap should be needed if you can modify the ROM in EcuFlash and re-flash... easy enough to check. Link to comment Share on other sites More sharing options...
laz Posted November 28, 2017 Share Posted November 28, 2017 Thanks everyone I came from a turbo car and I just missed it. What would be more practical ways to boost horsepower? ECU performance chip? and cold air intake? I would like the most bang for my buck. Buy a first generation Miata, turbo it for 3K...profit. You will not have a better time on anything else short of a gokart. --- Link to comment Share on other sites More sharing options...
dgoodhue Posted November 29, 2017 Share Posted November 29, 2017 People have done this before with "success" however keep in mind the power limit on 93 octane gas is around 200 whp. It is not bad power, but it is what it is. I would recommend checking out the Avo turbo kit if you want a turbo or Raptor Supercharger kit if you want a supercharger. No ECU swap should be needed if you can modify the ROM in EcuFlash and re-flash... easy enough to check. The AVO kit doesn't directly fit the 5th gen 2.5i and it will need at least bigger injectors to go with the tune. It's a lot of money for 200whp, when a GT put down 260whp with just a Cobb AP. The cost effective way is to sell your 2.5i buy a GT, its likely to be way more reliable as well and a lot less heartache and time. Link to comment Share on other sites More sharing options...
amusa Posted November 29, 2017 Share Posted November 29, 2017 Wondering how the CVT will handle the FI? Link to comment Share on other sites More sharing options...
GEE-OTTO Posted December 1, 2017 Share Posted December 1, 2017 I am looking to turbo charge my 2010 Legacy 2.5 Premium for as affordable as possible. I was wondering what would the best way be. I was recommended that used gt parts would be a great start. I was also wondering if any of the sti/wrx parts are interchangeable with the legacy gt. From what I gathered I would need a turbo, exhaust, inter cooler, blow off valve, intake, oil lines and coolant lines. Would you suggest anything else? I was looking more for stock parts because I know a lot of after market parts might be stronger than my engine can handle. For that platform your best bet would be to mimic the low mount 10-12 LGT or adapt the BRZ turbo kit style for forced induction. Your weak point is the CVT, its not rated for sustained high torque throughput. It would work but you would wear the belts/chain belts/those mesh belts inside it much faster than designed. The hardware is always the easy part, the tuning could get tricky. As a general rule for these types of projects try to get as close to your goal with existing parts before cuts and welds and splices are needed Sounds cray but that is how many car makers arrive at new models. Generally speaking youll need the plumbing to run the turbo, cool and supply boost, you will need to cool and lubricate the turbo, need monitor and adjust boost, tuning software to alter the various tables (fuel, requested torque, MAFv, boost, AFR, OL/CL, etc), fueling upgrades, you get the idea Link to comment Share on other sites More sharing options...
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