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Old 08-23-2015, 05:12 PM   #1
fastnfurious7
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Default 06 2.5L Forester motor in 03 wrx

Have an opportunity to put a 2.5L in my 03 WRX. Motor is from an 06 Forester. What all do I need to do to make this work? Keeping heads from the Forester Ok & then swap everything else from the 2.0 from the WRX to the 2.5? To answer you may need more info about my car, one key point is my car has a standalone Megasquirt ECU. Any help is appreciated.
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Old 08-23-2015, 06:47 PM   #2
Unabomber
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Abandon this idea. Completely. Reasons for this:

1. You are not skilled at asking questions online. You state "a 2.5L". Terrific...what flavor? So not even past the first sentence, you can't ask a specific question. That's a bad sign. I won't go into the rest of the holes in your questioning.
2. Megasquirt ECU. These have not been used since the Civil War and the amount of people still alive that have any knowledge of their use on a "hybrid" is probably around 3 on the planet with 2 of those people living in the down under side of the planet.
3. Your main question seems to wanting to use the 2.5L Forester heads on 2.0L motor? I read the "Keeping heads..." sentence 32 times and still don't know what's going on, but it appear you are thinking of doing some hybrid setup, but that's NOT what a hybrid setup is....that's a 2.5L block with 2.0L heads.

My recommendation is to keep your car as is if its fine or take this concept or alternate idea to fix your car to a local professional along with your checkbook and say, "Make this happy and call me when you are done".
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Old 08-23-2015, 10:22 PM   #3
fastnfurious7
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Quote:
Originally Posted by Unabomber View Post
Abandon this idea. Completely. Reasons for this:

1. You are not skilled at asking questions online. You state "a 2.5L". Terrific...what flavor? So not even past the first sentence, you can't ask a specific question. That's a bad sign. I won't go into the rest of the holes in your questioning.
2. Megasquirt ECU. These have not been used since the Civil War and the amount of people still alive that have any knowledge of their use on a "hybrid" is probably around 3 on the planet with 2 of those people living in the down under side of the planet.
3. Your main question seems to wanting to use the 2.5L Forester heads on 2.0L motor? I read the "Keeping heads..." sentence 32 times and still don't know what's going on, but it appear you are thinking of doing some hybrid setup, but that's NOT what a hybrid setup is....that's a 2.5L block with 2.0L heads.

My recommendation is to keep your car as is if its fine or take this concept or alternate idea to fix your car to a local professional along with your checkbook and say, "Make this happy and call me when you are done".
Thank you so much for your help. This community is all about helping each other & that's why I'm so proud to be a member.

I'm very sorry that my post is confusing but I'm just a hillbilly & I can't speak what I mean sometimes. To clarify, it's an 06 Forester engine. The whole engine...not part of the engine...I believe that's called a long block but I'm a hillbilly & I can't be sure that's what you'd call it. Anyway, I wanted to make sure it would be fine if I used the 06 Forester long block to replace the 2.0L in my WRX. That's really all I'm asking. Just wanted to make sure that the heads can handle the turbo boost. Also wanted to know if there were any other things about the swap I should consider & I have that ancient civil war Megasquirt that I got last year that is so antiquated but us hillbillys are fond of them bc we're not very smart.

Thank you for all of the help here on this awesome website!

Last edited by fastnfurious7; 08-23-2015 at 10:28 PM.
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Old 08-23-2015, 11:47 PM   #4
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I see you are attempting to be passive/aggressive. That's a terrific tactic to illicit a positive response. How's that working out for you? Probably as good as your reading comprehension as I asked you which flavor of 2.5L engine you have you and replied back with zero helpful information as the 2006 Forester came with EITHER a 2.5L naturally aspired motor OR a 2.5L turbocharged motor.

WHICH GOD DAMN MOTOR DO YOU HAVE????
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Old 08-24-2015, 09:05 AM   #5
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Apologies once again for my hillbilly reply. I'm so stupid I don't know how to answer at times. You've been terribly helpful so far & now I've made you upset to the point of taking the Lord's name in vain. Had you specifically asked "is it turbo or not" instead of "what flavor" my low IQ may have be been better suited to illicit the proper response. It is a normally aspirated 06 Forester engine. I'm pretty sure now, after asking someone face to face that was patient enough to put up with my ignorance, that these engines came with SOHC. I had no plans for a hybrid engine, as you somehow thought I did, but now that seems like the best course of action. If I continue with this project, I should use the 06 Forester 2.5L naturally aspirated short block & then add my 03 WRX 2.0L heads. Is this correct, Ted Kaczynski? Thank you so much for putting up with my ignorance on this subject & offering to help!
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Old 08-24-2015, 11:42 AM   #6
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Quote:
Originally Posted by fastnfurious7 View Post
Apologies once again for my hillbilly reply. I'm so stupid I don't know how to answer at times. You've been terribly helpful so far & now I've made you upset to the point of taking the Lord's name in vain. Had you specifically asked "is it turbo or not" instead of "what flavor" my low IQ may have be been better suited to illicit the proper response. It is a normally aspirated 06 Forester engine. I'm pretty sure now, after asking someone face to face that was patient enough to put up with my ignorance, that these engines came with SOHC. I had no plans for a hybrid engine, as you somehow thought I did, but now that seems like the best course of action. If I continue with this project, I should use the 06 Forester 2.5L naturally aspirated short block & then add my 03 WRX 2.0L heads. Is this correct, Ted Kaczynski? Thank you so much for putting up with my ignorance on this subject & offering to help!
Are you saying you want to use a N/A EJ253 block (like what your 06 Forester engine is) and the WRX 2.0L heads together? Are you plans to turbocharge the engine?

If so, that would not work because the compression ratio/build of the EJ253 would not handle very much boost before it would blow. I would just use a 2.0L block with the 2.0L heads or, if you plan to go hybrid, use an EJ255 or EJ257 block.

If not, why would you want to put your 2.0L heads on a 2.5L block that is N/A? You couldn't possibly make that much more power and it would be a headache to work everything out correctly. I would just use the whole 2.5L block and heads.
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Old 08-24-2015, 12:13 PM   #7
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Ok, now you're schooling me & I do seriously appreciate it. I'm not sure why I couldn't confirm online that the Forester engine was or was not an EJ255. Now I know it's an EJ253. That being said, you said the EJ253 wouldn't handle much boost before it'd blow & then you said to use the whole 2.5L long block. I wanted to clarify that you are saying to use a whole 2.5L EJ255 & that I can't use the whole EJ253 for this application. Correct?

Truly sorry we got off on the wrong foot. You are helping a great deal now.
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Old 08-24-2015, 02:52 PM   #8
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You CAN turbo a N/A motor. Having said that, it is NOT the way to go. Some will hate on me for saying this, but I've been here for 987 years and never seen one done worth a spit in terms of power or longevity over what one might do with simple bolts ons.

So if you swapped in the whole N/A motor, which you could, your car would be gutless compared to the 2.0L turbo you have now.

Now if you want more power.....your options are:

Bigger turbo (if your motor is good)
Some more bolt-ons (if your motor is good)
Hybrid setup (2.5L block, crank, pistons + 2.0L heads OR 2.5L stuff + milled 2.0L heads OR 2.5L stuff using special JE pistons) (I recently did special JE pistons route hybrid)
Whole 2.5L swap of 255/257 or JDM flavors

If you want more help about above, holler back.
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Old 08-24-2015, 04:25 PM   #9
fastnfurious7
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Thanks, guys. After all the help I think I'm going to pass on messing with this EJ253. I'm going to pull my 2.0L engine, figure out what's wrong with it, & possibly repair it depending on what I find.
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Old 08-24-2015, 06:44 PM   #10
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What issues are you having with your 2.0L engine?
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Old 08-24-2015, 09:19 PM   #11
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http://forums.nasioc.com/forums/show...php?p=43722205 may help with that to do/need to get for when the motor is out.
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Old 08-24-2015, 10:30 PM   #12
fastnfurious7
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Quote:
Originally Posted by monkeyposeur View Post
What issues are you having with your 2.0L engine?
Less than 2 weeks after a dyno tune was bought & paid for, the engine began dumping copious amounts of blue smoke. A compression test revealed 0 compression on cylinder 1.

Also, thanks for the list. That will help immensely.
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Old 08-24-2015, 11:26 PM   #13
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YOU'RE WELCOME

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Old 01-30-2016, 09:02 PM   #14
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Default EJ255 engine swap thread jack

Hello all, so I have a question similar to the above posted user regarding an engine swapped 2002 wrx and what I believe are some turbo issues. So here are the facts:
The car is a 2002 wrx bug-eye that had the original 2.0 EJ20 engine in it that grenaded so it received an engine swap.
The new engine is an EJ255 from a 2005 forester xt. It is what's been termed as the "variant 1" version that uses the AB650 heads.
It has upgraded 565cc injectors, 3'inch Invidia up and down pipes as well as a 3' catback exhuast. It also has an injen CAI which is meh, and I may remove if I can find a stock one at a decent price.

Lastly it has a Cobb access port and an professional tune
Allright asides from that the car is all stock wrx in terms of engine components, so wrx intercooler, turbo (TDO4/T13?) and he has kept the cable throttle body setup so it is still a pull cable to the pedal, not the drive by wire found in the forester xt.

I have yet to purchase this car but, am seriously considering it. I have gone and examined it in person and during the test drive there was one thing that really struck me as odd regarding the turbo/boost.

When driving, the engine starts pulling around 2500ish and you can feel boost building, it however climaxes at 3000-4000rpm, it holds to about 4500ish but then it sort of just drops off pretty hard in terms of power.
Anything past 5000rpm it can go up towards redline at 6800 but those last 2000rpm it feels like you are flogging a mid 1990's tercel, not a wrx.

Overall I felt the pull of the engine was rather lackluster, I would say it felt like a 200hp (maybe) car and that's tops.Just like when it felt like the engine was getting going, it dropped off. On snow and ice where I was testing it, the car couldn't spin all 4 tires in 3rd. It was able to in second but, nothing crazy pretty weak to do so in second gear. (for reference the car has winter tires on it, bridgestone blizzaks, but only about 5% tread left so not great).

According to the owner the reason for this is that the turbo is undersized for the engine, and that the engine needs bigger turbo with a volume of airflow to solve this feeling of the engine dropping dead at 5000rpm.

I'm however a little bit skeptical of this since (from what I can tell at least) it is the exact same turbo used in all of the wrx's from 02-06.



So my questions are as follows:

Firstly is this dead feeling/unwillingess to rev normal for a wrx of this year? ( My only reference is a 2015 wrx that I've been privileged to drive a number of times, so perhaps due to this I have set the bar too high even though I've tried my best not to compare between the cars.)

Secondly, would the solution be as simple as putting on a larger (sti sized) turbo. Addtionally the owner claims that the current intercooler would suffice even for a larger turbo (it is the stock wrx intercooler) is this accurate and what is ballpark cost of the turbo (assuming I install the turbo)?

Thirdly, considering the two above should I still be considering this car our should I be running away as if it were a ticking time bomb?

For reference I'm not tracking this car or anything like that, just use for occasional pleasure driving and getting my mountainbike and myself out into the woods. For a little more reference i'm fairly mechanically inclined, my father is an ex-honda (motorcycle) mechanic and I grew up spinning wrenches on my bikes, the car is set at 6500$ canadian, and my budget is up to 7500$ for purchase and 2000$ for repairs right off the bat (if needed).
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Old 01-30-2016, 09:36 PM   #15
ImprezaLover94
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Quote:
Originally Posted by CBR900rider View Post
Hello all, so I have a question similar to the above posted user regarding an engine swapped 2002 wrx and what I believe are some turbo issues. So here are the facts:
The car is a 2002 wrx bug-eye that had the original 2.0 EJ20 engine in it that grenaded so it received an engine swap.
The new engine is an EJ255 from a 2005 forester xt. It is what's been termed as the "variant 1" version that uses the AB650 heads.
It has upgraded 565cc injectors, 3'inch Invidia up and down pipes as well as a 3' catback exhuast. It also has an injen CAI which is meh, and I may remove if I can find a stock one at a decent price.

Lastly it has a Cobb access port and an professional tune
Allright asides from that the car is all stock wrx in terms of engine components, so wrx intercooler, turbo (TDO4/T13?) and he has kept the cable throttle body setup so it is still a pull cable to the pedal, not the drive by wire found in the forester xt.

I have yet to purchase this car but, am seriously considering it. I have gone and examined it in person and during the test drive there was one thing that really struck me as odd regarding the turbo/boost.

When driving, the engine starts pulling around 2500ish and you can feel boost building, it however climaxes at 3000-4000rpm, it holds to about 4500ish but then it sort of just drops off pretty hard in terms of power.
Anything past 5000rpm it can go up towards redline at 6800 but those last 2000rpm it feels like you are flogging a mid 1990's tercel, not a wrx.

Overall I felt the pull of the engine was rather lackluster, I would say it felt like a 200hp (maybe) car and that's tops.Just like when it felt like the engine was getting going, it dropped off. On snow and ice where I was testing it, the car couldn't spin all 4 tires in 3rd. It was able to in second but, nothing crazy pretty weak to do so in second gear. (for reference the car has winter tires on it, bridgestone blizzaks, but only about 5% tread left so not great).

According to the owner the reason for this is that the turbo is undersized for the engine, and that the engine needs bigger turbo with a volume of airflow to solve this feeling of the engine dropping dead at 5000rpm.

I'm however a little bit skeptical of this since (from what I can tell at least) it is the exact same turbo used in all of the wrx's from 02-06.



So my questions are as follows:

Firstly is this dead feeling/unwillingess to rev normal for a wrx of this year? ( My only reference is a 2015 wrx that I've been privileged to drive a number of times, so perhaps due to this I have set the bar too high even though I've tried my best not to compare between the cars.)

Secondly, would the solution be as simple as putting on a larger (sti sized) turbo. Addtionally the owner claims that the current intercooler would suffice even for a larger turbo (it is the stock wrx intercooler) is this accurate and what is ballpark cost of the turbo (assuming I install the turbo)?

Thirdly, considering the two above should I still be considering this car our should I be running away as if it were a ticking time bomb?

For reference I'm not tracking this car or anything like that, just use for occasional pleasure driving and getting my mountainbike and myself out into the woods. For a little more reference i'm fairly mechanically inclined, my father is an ex-honda (motorcycle) mechanic and I grew up spinning wrenches on my bikes, the car is set at 6500$ canadian, and my budget is up to 7500$ for purchase and 2000$ for repairs right off the bat (if needed).
This is somewhat related, but should be posted in a thread of its own.

Try reading through the buying guides here on NASIOC:
http://forums.nasioc.com/forums/show....php?t=1679821

In short, you should try to get it to a professional Subaru mechanic/tuner to have them look it over and make sure everything is in good mechanical condition (which should include a boost/intake test, leakdown, compression, etc.).

To answer one of your questions, yes the TD04L-13T (stock WRX turbo) is a bit small for the 2.5L engine. However, this was the turbo used on the 02-07 USDM wrxs, and the 06-07 had the 2.5L engine and I wouldn't compare its top end to a 1990s tercel. It seems like there is probably something wrong with the car, hence the reason the guy is selling it. Unless you are very familiar with Subarus and know exactly what is done to the car, I wouldn't get it and start with something closer to stock.
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Old 01-31-2016, 01:28 AM   #16
CBR900rider
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I agree it probably should have been a new thread but, I lacked the sufficient # of legitimate posts required to create a thread. As such I tried to follow up in the most closely related one I could find. As for the certified mechanic I absolutely agree and have every intention to before buying the car, what I was curious about was if the car was indeed even worth pulling in/paying the fee to have a certified subaru mechanic examine the car, or if I'd simply be better moving on elsewhere.

If you would like to move this to a separate thread that would be fine by me.

Cheers,
CBR
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