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Old 02-27-2021, 11:30 PM   #1
demid30
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Default Ej20x in 2014 WRX?

So after 173,000 miles cylinder 4 has 10psi compression and 90% leak down at valves and crankcase. Prime Motoring here in NJ are telling me it's cheaper to replace with used engine then to pull mine and find the problem and fix it the right way. They suggested either used ej25 or Ej20x. The Ej20x are half the price. They will professional tune it and it's still way cheaper then using the ej25. Any suggestions? Anyone running an Ej20x?
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Old 03-01-2021, 11:57 PM   #2
V10SNEK
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Quote:
Originally Posted by demid30 View Post
So after 173,000 miles cylinder 4 has 10psi compression and 90% leak down at valves and crankcase. Prime Motoring here in NJ are telling me it's cheaper to replace with used engine then to pull mine and find the problem and fix it the right way. They suggested either used ej25 or Ej20x. The Ej20x are half the price. They will professional tune it and it's still way cheaper then using the ej25. Any suggestions? Anyone running an Ej20x?


Arenít the ej20x engines open deck? As long as youíre not trying to get insane power levels, youíd be totally fine. The only issue between a used engine and a rebuild is that you donít know the condition of the bearings, cam lobes, etc. If an engine ran low on oil pressure for just a few seconds, it would shorten the life of that motor drastically.

My advice is if you want to get it running and sell the car, slap a used engine in there. If you want to keep the car, spend the extra and rebuild the block with some decent bearings and rings. (Might as well upgrade anything else while itís apart.
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Old 03-02-2021, 09:25 AM   #3
Max Capacity
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If you decide to go cheap, do you plan to stay in that area ? I've heard that when issues pop up in the future, getting repairs done to a JDM engine can be tuff.

I did a OEM ej257 shortblock back in May 2012, that engine now has over 142,000 trouble free miles on it. Kept the ej257 stock, car has a vf52 dynoed at 21psi on stock fueling. I did have ARP heads studs installed in the ej257.
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Old 03-03-2021, 02:23 AM   #4
SlammedSix
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I had an EJ20x in my 08 STi, they are definitely a very cheap alternative. There is nothing different from a EJ20x JDM motor to a EJ257 Dual AVCS USDM when it comes to replacement gaskets and parts. There is 2 different styles of EJ20x you can choose one with air injection system and one without. I don't know your smog regulations but your vehicle has an air injection system so if you want to maintain the system you can go with the EJ20x with the "U20" heads, or if you want to delete your air injection get the EJ20x with the "Z20" heads

Its a strong little motor and I was very impressed with it. I was running a UDSM STi turbo, stock injectors, with an Intake, Downpipe and Exhaust. I was revving the car to 7700RPM and running about 21 lbs of boost taper to 19psi at redline. You definitely have to watch the timing that is put in on the tune due to the higher compression ratio.

Just for comparison I had the EJ20x in my STi and my buddy had a 2012 WRX with intake, Downpipe, Muffler delete. He was set to 20PSi and taper to 16psi by redline and his car was running very well for a Stage 2 WRX and our cars were basically identical in speed from the roll races we did.
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Old 03-10-2021, 06:39 PM   #5
demid30
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Quote:
Originally Posted by V10SNEK View Post
Arenít the ej20x engines open deck? As long as youíre not trying to get insane power levels, youíd be totally fine. The only issue between a used engine and a rebuild is that you donít know the condition of the bearings, cam lobes, etc. If an engine ran low on oil pressure for just a few seconds, it would shorten the life of that motor drastically.
My advice is if you want to get it running and sell the car, slap a used engine in there. If you want to keep the car, spend the extra and rebuild the block with some decent bearings and rings. (Might as well upgrade anything else while itís apart.
Yes they're open deck, I'm not trying to get insane numbers. I just want it to be as quick or a little quicker then the stock setup. I found a place 10 minutes away that sells the Ej20x for $1050, which is a really good deal. A used ej255 is around 5k. The guys at prime said to pull the engine and do everything the right way rebuilding my engine would cost like 10k said and done. Im not looking to drop that much cash.
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Old 03-10-2021, 06:41 PM   #6
demid30
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Satin White Pearl

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Quote:
Originally Posted by Max Capacity View Post
If you decide to go cheap, do you plan to stay in that area ? I've heard that when issues pop up in the future, getting repairs done to a JDM engine can be tuff.

I did a OEM ej257 shortblock back in May 2012, that engine now has over 142,000 trouble free miles on it. Kept the ej257 stock, car has a vf52 dynoed at 21psi on stock fueling. I did have ARP heads studs installed in the ej257.
Yea I don't plan on leaving the area, and I don't think prime motoring is either. So I'm sure they'll be able to help me out. I can do a lot of work myself, if I have the time.
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Old 03-10-2021, 06:44 PM   #7
demid30
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Member#: 256620
Join Date: Sep 2010
Chapter/Region: Tri-State
Location: New Jersey
Vehicle:
2014 WRX 4dr!!
Satin White Pearl

Default

Quote:
Originally Posted by SlammedSix View Post
I had an EJ20x in my 08 STi, they are definitely a very cheap alternative. There is nothing different from a EJ20x JDM motor to a EJ257 Dual AVCS USDM when it comes to replacement gaskets and parts. There is 2 different styles of EJ20x you can choose one with air injection system and one without. I don't know your smog regulations but your vehicle has an air injection system so if you want to maintain the system you can go with the EJ20x with the "U20" heads, or if you want to delete your air injection get the EJ20x with the "Z20" heads

Its a strong little motor and I was very impressed with it. I was running a UDSM STi turbo, stock injectors, with an Intake, Downpipe and Exhaust. I was revving the car to 7700RPM and running about 21 lbs of boost taper to 19psi at redline. You definitely have to watch the timing that is put in on the tune due to the higher compression ratio.

Just for comparison I had the EJ20x in my STi and my buddy had a 2012 WRX with intake, Downpipe, Muffler delete. He was set to 20PSi and taper to 16psi by redline and his car was running very well for a Stage 2 WRX and our cars were basically identical in speed from the roll races we did.
Thanks for all the information! I'm glad to hear you ran the Ej20x and liked it! Yes I know about the 2 different versions and that I have the secondary air pump. I am going to get the right one with the secondary air pump. You think I should run the Ej20x headers and turbo and what not with the Ej20x down pipe? Or use my turbo and headers with my down pipe?
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Old 03-16-2021, 10:40 AM   #8
tredmeister
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Quote:
Originally Posted by demid30 View Post
. ..You think I should run the Ej20x headers and turbo and what not with the Ej20x down pipe? Or use my turbo and headers with my down pipe?
A little different situation, but I just swapped a EJ20X into my 08 WRX. I really wanted to try and keep the twin scroll VF44 that came on the engine, but sourcing an inter-cooler and down pipe to fit became the hardest part of the build. I finally just splurged on an AVO Liberty GT inter-cooler and DP bellmouth, and fabricated a downpipe to fit. The final results after a conservative tune are a very broad and linear powerband that I am quite please with.

Last edited by tredmeister; 03-16-2021 at 02:54 PM.
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