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02-27-2021, 11:30 PM | #1 |
Scooby Newbie
Member#: 256620
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2014 WRX 4dr!! Satin White Pearl |
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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03-01-2021, 11:57 PM | #2 | |
Scooby Newbie
Member#: 522727
Join Date: Mar 2021
Chapter/Region:
SCIC
Location: Southern California
Vehicle:2004 WRX Black |
Quote:
Aren’t the ej20x engines open deck? As long as you’re not trying to get insane power levels, you’d be totally fine. The only issue between a used engine and a rebuild is that you don’t 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 it’s apart. |
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03-02-2021, 09:25 AM | #3 |
Scooby Specialist
Member#: 149347
Join Date: May 2007
Chapter/Region:
NESIC
Location: Tolland, CT
Vehicle:05 LGT ,09 SpecB Black/silver |
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. |
03-03-2021, 02:23 AM | #4 |
Scooby Newbie
Member#: 419926
Join Date: Apr 2015
Location: 07 STi/ 08 STi/ 15 STi
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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. |
03-10-2021, 06:39 PM | #5 | |
Scooby Newbie
Member#: 256620
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2014 WRX 4dr!! Satin White Pearl |
Quote:
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03-10-2021, 06:41 PM | #6 | |
Scooby Newbie
Member#: 256620
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2014 WRX 4dr!! Satin White Pearl |
Quote:
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03-10-2021, 06:44 PM | #7 | |
Scooby Newbie
Member#: 256620
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2014 WRX 4dr!! Satin White Pearl |
Quote:
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03-16-2021, 10:40 AM | #8 |
Scooby Newbie
Member#: 522983
Join Date: Mar 2021
Location: Texas
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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. |
05-17-2021, 02:14 PM | #9 |
Scooby Newbie
Member#: 327578
Join Date: Jul 2012
Chapter/Region:
TXIC
Location: El Paso
Vehicle:2012 WRX Ice Silver Metallic |
so i have the ej20x in my 2012 wrx and i feel slow until 4k rpm. im assuming because of the exhaust cam being parked in a position where low rpm exhaust flow is restricted. im using the vf52 off of the original ej25 as i couldnt source a DP for the twin scroll that came on the 2.0. found the thread about programming arduino to run the avcs but he used custom 3d printed cases and mounting solutions i wouldnt have access to. I have seen posts about adjusting the ex cams in the u20 heads and heard 2 teeth is ok and whatnot. has anyone else done this in a single avcs chassis 2011+. thought about possibly getting a standalone to run it all together but that wouldnt be very cost effective for what the car is. (daily commuter and grocery getter). i really liked that arduino post from NSFW but if there is a simpler solution im all ears.
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05-17-2021, 02:29 PM | #10 | |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Quote:
Going standalone is costly as you said but certainly has its benefits. |
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05-17-2021, 02:46 PM | #11 | |
Scooby Specialist
Member#: 395793
Join Date: Jul 2014
Chapter/Region:
Tri-State
Location: SLC and Lake Placid
Vehicle:2005 92x Aero Beige |
Quote:
Are you using your intake AVCS? What supporting mods? I can't speak for clocking the ex cams, but you should be spooking faster than that with the VF52. It's not a huge turbo and single AVCS 2.0 on a VF48 that's been tuned properly with supporting mods sees full boost in the low 3000 range. Hell, my 20g XTR on a 207 sees 19psi by 3900 with a slow slow increase to 21psi by 4200 for a more linear feel. I could've had the full 21 by 3800 according to the tuner. So I'd look for leaks or at your list of mods to see if maybe the tuner held back for some reason. And this maybe the case considering fuel quality in the US and your engine having 9.5:1 CR from the factory. |
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05-17-2021, 05:24 PM | #12 | |
Scooby Newbie
Member#: 327578
Join Date: Jul 2012
Chapter/Region:
TXIC
Location: El Paso
Vehicle:2012 WRX Ice Silver Metallic |
Quote:
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05-17-2021, 05:36 PM | #13 | |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Quote:
With those mods, the spool seems fairly normal. |
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05-18-2021, 01:03 AM | #14 | |
Scooby Newbie
Member#: 419926
Join Date: Apr 2015
Location: 07 STi/ 08 STi/ 15 STi
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Quote:
I ran my EJ20x with a VF48 turbo and the Exhaust AVCS turned off and left at 0 degrees and i was able to still have the car spool just fine and never noticed any performance loss. I think you are just noticing the spool difference from a 2.0 to 2.5 liter engine. In stock form a 2.5 will spool that VF52 at like 3500rpm a 2.0 will do it about 4500. |
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05-19-2021, 07:47 PM | #15 | |
Scooby Newbie
Member#: 327578
Join Date: Jul 2012
Chapter/Region:
TXIC
Location: El Paso
Vehicle:2012 WRX Ice Silver Metallic |
Quote:
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05-19-2021, 08:01 PM | #16 | |
Scooby Newbie
Member#: 419926
Join Date: Apr 2015
Location: 07 STi/ 08 STi/ 15 STi
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Quote:
So outside of boost the 2.0 is essentially always making less hp than the 2.5 in your specific situation. Thats why the gas mileage is better because less fuel is less hp. But from personally experience that 2.0 can still get down when its under boost. |
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05-21-2021, 09:59 PM | #17 |
Scooby Newbie
Member#: 518830
Join Date: Sep 2020
Chapter/Region:
RMIC
Location: Colorado
Vehicle:2009 WRX dark grey metallic |
I’ve managed to improve my spool about four hundred RPM by playing with my AVCS intake advance. I advance it to 28 degrees while trying to build boost. Maybe try some changes to intake AVCS…
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