🤔 What's so special about Subaru EJ20 / 25 | TECHNICALLY SPEAKING
#subaru #haltech #engineteardown
Powering the Impreza WRX, STi, and Subaru WRC rally cars, Subaru's EJ series boxer engine has collected millions of fans worldwide. Today we're diving deep to see what’s so special about Subaru's famous EJ platform.
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00:00 Introduction
01:04 Subaru Boxer History
03:22 EJ Series Overview
04:37 EJ Mods and Tuning
06:32 EJ Problems
09:24 EJ Engine Teardown
15:50 EJ Timing Belt Removal
19:36 EJ Head Gasket Removal
22:28 EJ Piston Removal
25:42 EJ Bottom End
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It's time for another engine teardown! Although Subaru didn’t invent the boxer engine, they perfected it. Powering the Impreza WRX, STi, and Subaru WRC rally cars, the EJ boxer has collected millions of fans worldwide. Today we're diving deep to see what’s so special about Subaru's famous EJ platform. Haltech Plug'n'Play Subaru Kits: www.haltech.com/product-category/subaru/
Wish your elite 2500 work for newer EJ257. Lots of non supported features
Seriously! We want total control of everything in a VA chassis with one of these plug n play Haltech elite 2500 please!!! 🙏🏻😭
@@derrickgarcia303 All I want for Christmas is a plug and play Haltech stand alone for my VA STI. :(
What was the total time for him to take it apart? Looked pretty fast
16:22 NO! That is not top dead center. The timing marks line up at about 90 deg from TDC so the pistons are halfway down the holes and you can spin the cams around to get them timed. That's the ideal place to have it while disassembling.
240,000 miles on my manual transmission 2009 Impreza 2.5i wagon. I've fallen on hard times with health problems and have been homeless and living in it for 3+ years. Having a wagon has saved my life
Oh man, wish you the best Keep walking
But you're not a bum no more, right?
@@iAmFAUST no fboi I moved in with your mom 🖕🖕🖕
All the best too you🙏
EJ205 in 2000 SF Forester GT. Clicked over 405000km still original everything even turbo it seems! Still gets 9.5 l per 100 km fuel economy and will only puff a touch of valve stem seal smoke if you haven't started it for a couple of weeks. Sounds cool as
Do the turbo engines have the same headgasket problems the na does
@ajchilds2163 I think it's the 2.5 litre has head gasket issue but EJ20 2.0 litre doesn't
@@ajchilds2163generally not, at least in the US. The whole reason Subarus are notorious for their head gasket issue is because for a number of years on specifically the naturally aspirated models, they used a crappy paper-like head gasket. On all the turbo models they use metal ones which are very rarely prone to failure. As soon as Subaru started putting the multi layer head gaskets on the n/a cars, the issue went away
@copperwolf8792 OK I didn't realize they had different engine with the turbo and na and ik na have shitty head gasket I just did a gasket job on subaru I bought there eas huge diff between oem one and the felpro I put on
I am glad to hear this, I just bought at 2000 Forester S/tb (turbo ej205) with 120,000km. Doing the timing belt, tensioner, and pulleys next weekend even though the belt looks brand new.
Stock EJ255 with 286,000 miles still running strong in my 05 Legacy GT!
I have a EJ207 sti that I've owned for 15 years. I would drive it 3 hours to the track, drive it hard all day then back home! 200k's and going strong😁 I love it!
Which year EJ207 do you have?
@@leighton_lam 2001 sti
As a fun detail: this was the first timing belt I ever did. Went well until I went to put coolant back in and realized the gasket fell out of place on the water pump… So I did it the first time… twice.
You just loved that job so much you did it twice. ;-)
That gasket can be a pain.. Last one I did, I went RTV-Gasket-Rtv and it'll stick in place. then you're golden, brother!
SAME, FIRST TIMING BELT I EVER DID WAS ON A EJ 25
doing this for the first time soon, note taken. watch the water pump gasket
@@hughtenhove867 at least on the sohc motors it's a pretty simple job in my eyes. If doing in the car I just remove fans as long as I'm not doing water pump at the same time. If doing water pump as well, just take the radiator out too and give yourself more room.
I remember the Subaru's that the late great Possum Bourne ran Australian Rally Championship in the mid to late 90's and early 00's sounded awesome, not to mention that he was one of the finest rally drivers in the world. Just as spectacular as Colin McRea IMO. His Legacy and WRX's were all Prodrive from memory. Halcyon days!.
Possum Bourne was a friggin legend. As was Solberg who is sadly often forgotten as a Subaru WRC ace.
Possum Bourne's legacy is the shop (Possum Bourne Motorsport) still doing Subaru's in NZ... They even do the EZ30 and EZ36.
ej20g racing engines sound monstrous
I used to work as a professional automotive technician and Subaru timing belts were among the easiest and most profitable for the technician. These are substantially easier to do than most FWD cars. I almost always pulled the radiator to do the timing belt, since it takes about 15 minutes to do and gives you tons of room to work. The only part that sucked was on the dual cam AVCS versions, the bolts holding the cam gears to the cams like to self-tighten and can be really difficult to remove. This makes replacing the cam seals (which should be done with every timing belt) a bit difficult. The drivetrains on EJ Subarus are actually brilliantly simple to work on compared to most AWD tuner cars, especially vs something like an Evo or DSM. Pulling the engine takes a couple of hours, so if you have to do more than 2 jobs on the engine (or anything involving removing the heads) you just pull the engine.
Do enough of those engine removal and can easily be done in less than an hour. At least on the manual na platform
Great info. Please consider making a video on how to get engines out so quickly
I always wondered if pulling the one brine/removing stuff from the car made a technician’s job easier than just directly tackling the task at hand. Thanks for the input! I’m a new FA20 owner and I’ve been working my way up to doing an engine pull wventully so I can change out my pistons and rods
I am just a regular guy with Walmart tools. I am able to do belts, alternator, spark plugs, hoses, and so. EJ 2.5 is gonna hit 300 000 miles
took me a week. bum back , arthritis hands
Gotta say, i don't understand these head gasket failures that haunt Subaru, my WRX hit 367000km and it still has original head gaskets, not eating oil or no knocking noises. It has been miracle engine so far.
IIRC the head gasket issues were from the SOHC engines that used inferior materials. If you replaced the head gaskets with the metal gaskets found in the turbo engines, those engines were good. It is too bad that it was assumed all Subaru engines had head gasket issues. I still hear it to this day... even with late model cars.
My 99 wrx, 268km, just replaced gearbox, just replaced original starter. Still has original alternator, has been so reliable, regularly gets spanked and loves it.
16:27 scotty mentions having the engine on TDC to show timing marks, then mentions how he wound it over to move it off to avoid any piston to valve problems. Fun fact the timing marks for an ej are actually at middle stroke on all 4. You're nowhere near the pistons. You can still have valve to valve interference though so you do have to pay attention to which way you rotate the cams.
^^ Pro Tip:)
That is exactly what I was about to write. Hahaha 👍👍
I just saw your comment as I was about to say about the same thing. With the timing mark for the crank at 12 o'clock. You can rotate the cams without hitting the pistons. In that position the valves on the right head are close but not the left side.
I noticed that too. Also he calls it open deck but that engine was a semi closed
He missed the timing marks that are on the intake & exhaust gears that point at each other.
I think a majority of the issues involving a head gasket failure, revolves around Subaru not using the multi layer, graphite coated (I think), gaskets in the EJ engines during the early 2000s. They soon realized it was mistake and fixed it after the fact.
Only non turbo 2.5 north american EJs got the shit gaskets..
It was a multi layered mls gasket that failed, and this mainly applies to the EJ25 series, they delaminated. The replacements were fixed.
They are a masterpiece if maintained correctly. Ive got a 05 STi with original 207 and 265,000km later still running strong asf. Not a drop of oil or any issues.
How do you maintain it? Is it anything special I should be aware of? How do you drive it on a day to day basis?
yup EJ207 is the best, shame Americans got the EJ257
@@hovavrom keep your services on time and let it warm up properly before driving it hard.
@@mircebob yeah that works for me as well. Proper warm up and cooldown, regular oil changes 5 to 7k kilometers and don’t floor it on heat soaked top mount intercooler / high intake temps and always put in high octane fuel which it’s mapped on. And a proper mapping
@@marvinvisser5039 I wouldn't do more than 5,000 KM between oil changes. There was a guy who did his every 8,000 KM and he still spun a bearing.
Proud EJ257 owner. My initial EJ255 in my legacy did 348000kms before open boost took out a rod bearing, would have kept going otherwise. Good servicing goes a long way
Nearly 150,000 miles running 370bhp on an open deck wrx, and it had never had a rebuild and ran anti lag and launch control. What killed mine eventually was a failed oil pump took out the bearings. These engines are very reliable if looked after and serviced correctly and use high quality parts…
EJ205 which is in New Age WRX I wouldn't run above 350bhp without forged internals,you are been lucky to run above that for such long time,we have run 490bhp on EJ205 stroker and then went with EJ22G and stroker 2.35L which I would say is one of the best engine Subaru ever built For money EJ205/207 are best for bang engines with forged internals and you are looking at reliable 500-550bhp on open or semi closed decks,not sure if I would run above that figure semi closed deck For high power builds most of UK builders prefer EJ22G(which was used in 22B) and in US on other hands closed deck EJ257 are used although I still prefer stroker 2.35L,have run both 2.1L or 2.5L and 2.35L is way best in my opinion but agree servicing with OE parts and mainly not skimping on parts is best
I love EJ's, I think they are super easy to work on, rebuilt my whole EJ205 in my garage with basics tools which is 1 thing I like, you don't need any specialist tools to take these apart and rebuild.
Good point
My 92wrx is making 850 WHP. It has PPM rods, JE ultra pistons, heads are gasflowed with some combustion chamber work. Bee hive springs and titanium retainers from kelford. custom exhaust and turbo. It has a 9200rpm rev limit, its on 10PSI at 4200rpm and 40 psi from 4800rpm all the way till redline. It starts to run out of cam at 8500rpm but it will rev on to redline no problem. It is still using a factory ECU...lol. The engine is now 2 years old and has done many track days too, still good as gold. Its a great car to drive, crazy fast and it grips like hell... just brilliant!
Finally, someone that knows. My 2007 WRX is at 199k miles on the original head gaskets.
Fun fact: Unlike most engines, EJ Cam Drive Belts are not clocked at TDC. The crank is at 90° half way through the Cylinder 1 Combustion stroke when all the marks are lined up. Every other piston is also half way through its respective stroke in order, 3 is halfway through Compression 2 is halfway through Induction 4 is halfway through Exhaust All of the right bank valves are tight shut. In the left bank Cylinder 2 Intake valves are wide open, and Cylinder 4 Exhaust valves are wide open. Removing the belt almost always resulting in the left bank valves slamming shut. It's very important to return the left bank Exhaust valve to its timing position by turning the cam counter clockwise so that the Cylinder 2 Exhaust valve does not clash with the open Cylinder 2 Intake valve.
Proud Subie Family member - 2000 GT Forester with 02 sti spec C swap, 08 Hatch wrx and RS Turbo swapped Brumby.
Fell in love with Subaru circa 2002 when my coworker gave me the keys to his brand new WRX off the showroom floor for a weekend. Since then have owned several. Currently driving 99 GC widebody.
Hi. I have a 2005 wrx ej20. The car has done 216000km now and I have never touched the engine yet except for services. Never even had a engine light on in 19 years. Fantastic little car.
On an EJ engine, when all the timing marks are lined up, it’s actually not TDC on Cyl 1. All 4 pistons are in the middle of their stroke. Also, on the LH head, you want to use a tool to hold the cams in position while you take off the belt so the valves don’t hit eachother.
I just love the EJ They make nice Power and when kept UEL they Sound so damn special. Almost like a poor mans Muscle car (im germany, so big engines are crazy expensive to run here) I actually prevere the Ej257 over the 207 even when they are problematic. Studs, haedgasket, downpipe+exhaust and a good Custom tune gives a relatively reliebale 350hp but with very good midrange torque wich is a blast to drive here in the alps.
That's actually why Subaru Japan keep producing the 257 overseas vs the 207. While still mountainous, Japan has significantly less average road height/elevation than US, Europe, which have higher altitude roads and steeper slopes.
@@impreza0109 While this is all true, a modern turbo will spool up quicker and stay spooled up for longer than what Subaru were working with in the 90s, and more boost means more torque. I drive a 2.5GL NA, but i've driven the 20 and 22 NA as well, as TLDR the 2.2 is the best. It's quick to rev high like the 2.0, but has power like the 2.5, it's really the perfect engine.
i like manufacturers with unique engines - Porsche and Subaru, Mazda and its rotary- that smth that divert them from "mainstream" of industry
Awesome video going into all the details.
I have a 2015 STi and this video really taught me a lot about the motor! Very Informative!
Our 2008 Subaru Legacy had the EJ20 engine, never had a more reliable car ever! this thing took us from Oslo to Chalkidiki! it clocked over 500k kilometers without a single problem! still have it to this day.
I've got a 2000 legacy blitzen EJ 20 done over 230 thousand km Never had a problem doesnt blow smoke or use any oil between oil changes still sounds tight and quiet when running and switched off....I use high quality synthetic oil and factory filters most reliable car I've ever had and still have it today
Loved this break down !
i could watch these all day
Great job explaining everything Scott
Thanks Scott! We appreciate you! 🙏
Check Engine Light - EJ20 10:34 Tumble Generator Valve 11:54 Secondary Air Pump System (Sorry, I just wanted to put some easily searchable tags here so I can find this info again. Carry on.)
Love my ej25 , close to 360 k on it now , had head gaskets and an arp stud kit around 100k ago due to small compression into coolant leak - runs like an absolute champ still though with a vf34 @ 19 psi … I rate em 👍
Please don't remove the timing belt by unbolting the tensioner, it strips the threads on the tensioner bracket. your suppose to pin the tensioner and remove the left lower idler per factory manual. And there is a relief pattern on the head BOLTS so you don't warp the block taking it apart.
Love this guy has finally made great videos
Great work Scotty - you certainly know your stuff. Cheers mate.
I enjoyed watching Scot do all the hard work! Very informative video backed up with good explanations based on experience.
Awesome seeing an EJ video from Haltech! You should do a video with upgrades and tuning tips for the EJ also.
I salute you for the elegant presentation of your content and your classy eloquence.
I tore my first EJ down two years ago and rebuilt it. It was terrifying but exhilarating and it runs! Great vid!
Wow, eye opening. Cool engineering! Realize the engines flaws and plus points. Thanks Scott.
Thanks so much Scott Love Subi's and you've dispelled some of the mysticism. 🤛💪👍
15:53 for anyone interested in doing their timing belt on their EJ, it's actually not super difficult. It's definitely a hard job, but having an extra set of hands really helps and you really need to take the radiator out to give you a lot more room to work.
Was great to see one of these pulled apart. Great video thanks.
Very nice to see the guts of my motor! Love the content coming out of Scotty and the Haltech team. Great Aussie company!
That was really cool. I don’t have the technical skills, tools or equipment to tackle such a project myself, but loved seeing it done.
Great video. Great job explaining everything
Great video Scott, always getting better! Love these engine teardowns. I'd love to see a video about the Honda B series engines - very commonly used in swaps, I've got one pulled apart ready to go into my classic mini!
I would love to see a video on the FA20! I recently got a 2020 WRX and would love to see a similar video about that engine! great work guys very informative and i appreciate you doing this
It's like this, but twice as much time due to increased complexity and the timing chain system.
Me too! I have a 2017 WRX and I got it specifically because the improvements they made like direct fuel injection. I’m eager to see where the shortcomings are the the FA series engines
di = carbon buildup
Great educational video explaining the engine controls and how your computer is calculating the sensors and adjusting all the good stuff!
One of my all time favourites is the EZ30, great to dismantle! Similar to the EJ platform but with a few extra components and some differences such as variable valve lift and timing chain assembly. So much more but you get the point.
Excellent presentation. I’ve watched quiet a number on KZhead.
Awesome vid 🤘I bought and still own a 04-05 n/a 5speed Impreza RS 2.5 new from the factory about 18years ago, having the scheduled maintenance done. Proud to say it still runs like clockwork 😉👍
Good stuff Scott, been waiting for this one 😛 Plenty of EJ207's around after 2005 also, I have a 2009 GRB spec c with a 207, most of the factory backed race cars and S20x variants etc. were powered with the 207, pretty sure you can still buy a brand new 207 'crate motor' from STi in Japan
Belt and pump on my old EJ204 was the first and only belt-job I ever done ;) Seem to worked out alright since its been running for years since.
Love the EJ255 in my 07 Legacy 2.5GT. That subie rumble never fails to make me smile.
Thanks very much,for an excellent start to my Sunday morning,Solid content.Country Victoria checking in.
Awesome tear down. Great to see you in something other than Mighty Car Mods.
I have a North American 2002 WRX Wagon with the EJ205. It's got 168,000 miles on it currently and still going strong. Had an experienced Subaru tuning shop do the timing belt and water pump for me a few thousand miles ago. I love this car. Pretty sure if the motor blows up I'm just gonna slap another EJ205 in it. Either that or buy another GD chassis WRX. Definitely the best car I've ever owned. I have mine lifted with skidplates and inverted rally style coilovers plus some A/T tires. It's not the best off-roader, but man, it can really rip down the desert washes we have here in California. I think I also have the only high-mileage WRX in the world that doesn't burn oil lol. In short, this car has never let me down. I love it.
I got a 1 owner 02 wrx and its about to hit 200,000miles. Its been the most reliable car I've owned. Its still daily driven and has only needed your average maintenance its whole life.
Great video! Very informative, no nonsense and I learned a lot about the motor I rely on daily. Maybe I should go easy on the stoplight pulls...
My self and my girlfriend are both Subaru dealer techs in the states, and the Ej definitely has a soft spot in my heart. I have an 05 Wrx that is both my daily driver and my Rallycross car and the fact of the matter is my girlfriend is the one who rebuilt the engine that currently gets absolutely punished. I love the Ej for its quirkiness but simplicity. I also love the newer chain drive F series engines, but there's just something about the Ej. Love the video Haltech!
I have a 98 2.5rs and I literally did my head gaskets in my garage with a piece of glass, multiple grits of sand paper, wd40, a lot of patience and counting passes, at the same time cleaned up and rebuilt the heads, I have now been driving it for 2 years daily with no issues. These things aren't hard to work on and they can be reliable if taken care of.
Great video
Great video.
I've been waiting for this episode!
Thanks heaps Scott being new to the EJ life this was very educational
This was so awesome to watch
Thanks a lot mate, very helpful, very informative! I'm a proud EJ20 owner, this was very helpful. Much love from Uganda 🇺🇬 ❤
Very interesting,thanks for that.I have one Subaru ej 20 .You give me good understanding for ej engine
Thanks Scott, that was a fun watch! I’d love if you did an S54 engine tear down at some point.
Love my ej207 pushing a lazy 240kw atw on 22psi on 98 Street tune in my wagon but iv gone overkill on turbo setup n fuel system for e85 n more power love the torque and how smooth it is
That was very useful breakdown info ma’am thanks so much
Where's the Forester love guys? 04 XT with a EJ255 and loving it. Head gasket failures basically come down to non-turbo models using single layer gaskets with a coating on them for sealing. The coating wears and boom, there's your leak. Use the turbo model's MLS gasket and you're good to go. Fun fact, the Subaru gasket kit for non-turbo models still include the terrible SLS coated gasket. Mr Subaru on here has some solid information about it all!
The head gasket issues are due to the composite gaskets used only on the NA engines. Subaru bought a stock of several hundred thousand of them in the early 90s. But the composite head gaskets were NOT used on the FI engines as it was known it wouldn't hold up. Luckily, the differences between the heads and block are minor (so long as you stick with "like for like", so an EJ25 head on an EJ25 gasket on an EJ25 block+piston and conrods), so there's no problem putting an FI MLS gasket on an NA head and block. In fact, it's encouraged.
I love your great work Thank you
Thanks. great video👍
I can tell you do like Subaru. They are wonderful cars and sound amazing. Hope to see more of your videos.
really interesting video thanks
My dad has a 2008 EJ20 Impreza with 370k km on it, still runs like a charm, gonna have the engine and trans rebuild before it gets passed down to me though, can't wait
I waited, and it was worth the wait. Thanks boys
Quite a few people requested it. Despite all its shortcoming, the good ole EJ seems to have quite the following!
Great video, very informative and well presented.
On point maintenance is everything on on EJ engine, consistently changing fluids particularly oil and coolant is the key.
Not sure how I haven't come across this vid earlier love tuning fork! And I'll be on the phone by February for a tune from 450kms away !!
I'd love to see a teardown on the VQ35DE! It's not the most popular motor but they have tons of potential and are probably one of the best V6 on the market
Gone thru 2 motors so far, 2 open decks and on my first closed deck now. I love these motors. I beat the crap out of it every time I drive it. Very fun cars to drive
well done and explained !!!
Love your video, I'm looking to rebuild my legacy gt in the future. Shes running strong no issues just a little more HP.
My EJ25 SOHC on my '01 Forester is still going strong with 205k miles.
I just recently finished a rebuild (well, not me but for my GC8) and so far very happy with the current setup! It's an EJ20G closed deck block with a 2.5 crank and CP stroker pistons (so 2.14 displacement), built non-AVCS heads with 272 Kelford cams and all the Ferrea goodies to go with it 😬😬😬 Very responsive and very fun for the street but it is an old block so there's quite a bit of blow by and pressure in the case and heads. All running with your Elite 1500 ECU of course 😉
Great tear down video ! Hoping to one day rebuild my EJ 20 on my 02 wrx - when it expires, not anytime soon, though. I love the fact that it's an Automatic Cheers
EJ22 was my first ever timing belt change. Oh boy was that an experience
Long-time Subaru driver here. Been bloody lucky in that I've never torn one down, so this was fascinating. Many Thanks!
I've got an 02 forester, EJ205 with bolt ons tuned to 186kw atw (18psi), it was 100kw atw when it was stock. Its been that way for 10 years and 70000 km and has been completely reliable. Look after them and they are solid little engines, It would have been good to note how the cam cover seals, particularly on the drivers side are notorious for dripping oil onto the exhaust.
Great video Scott, happy you guys made this. Ive got a 09 forester xt stage 2, the ej255 is doing great at 176ks. 6month oil changes keeps her happy. The pcv system on these could be a whole other video and plays an important role in engine longevity.
I have over 150k miles on my 09, running a vf52. Unsure if headgaskets were ever done as I'm the second owner. Runs amazing with the Cobb AP and tune.
awsome series!
My dad's 1983 Subaru GL wagon was purchased new in Louisiana, shipped to Germany, California, Italy, and then Texas, due to his US Air Force service. Over 200k miles on the manual, carborated, FWD station wagon, which 19 years later was still running and became transportation for a college kid for $1k. I now have a 2018 6MT Forester, getting 30 mpg in Cleveland Ohio. I can't speak to the CVTs or the future of the company, but so far, I love my Forester and would buy another.
Knowing hardly anything about a Subaru motor, THIS is pearler video. Great stuff
Thanks Scotty I watch a lot of your work but I ve owned 3 Stis and 5 wrxs that my family drove..all tuned with bolt ons.no issues the way they were tuned and serviced..my fav was my version5 Sti...I've travelled all over Australia.. tracked my Stis even towed a ski boat absolutely no issues except the normal wearing parts and my version 7 had a fuel pump relay fail just love them still have my 2002 its immaculate
it´s such good timing you did an EJ. I bought a 2007 Impreza NA with the EJ20 in it and i love that thing. Bought it as a family car daily with 180kkm on it. I´m so relieved to read all those comments here which say they run those for well over 300kkm with good maintanance and a bit of love. I so hope my one makes the 3 on the first digit in the future. planned to keep it till my kids go to school (wife is pregnant) And thank you Scotty for the in depth look and well made explanation on how they work.