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Old 09-08-2018, 07:31 AM   #1
awcforever
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Member#: 382066
Join Date: Feb 2014
Location: Virginia
Vehicle:
96 Subaru
Green

Default Question about JDM EJ205

(2004 WRX EJ205)
So I just got my car tuned and unfortunately in a past life sheís been mistreated and spun a rod bearing just after National Speed finished the tune😓. Iím just swapping the long block with a JDM EJ205 long block and wanted to know how much difference there would be switching from the 8:1 compression to 9:1. My tune was finalized on the USDM so can I drive the car back to Richmond or should I pretty much plan on trailering it again.

The shop said that after I do the swap the tune would be at 90% and should be fine until I have time to return, but I would like to see what you guys thoughts were. Thanks.

*EDIT - Iím sorry I just realized I clicked 2.5 forum and not 2.0, apologies.
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Old 09-08-2018, 08:53 AM   #2
bp05obxt
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Member#: 459799
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Default Question about JDM EJ205

The compression makes it more sensitive to put it simply. You could drive it but very carefully. Stay out of heavy load conditions to keep the boost from building too much or to quickly.

Ps: Run high quality oil like AMS 10-40w (high zinc) these ej205ís love to consume bearings and the better oil plus the zinc to help protect bearings is a way to improve reliability.
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Old 09-08-2018, 08:57 AM   #3
awcforever
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Default

Quote:
Originally Posted by bp05obxt View Post
The compression makes it more sensitive to put it simply. You could drive it but very carefully. Stay out of heavy load conditions to keep the boost from building too much or to quickly.

Ps: Run high quality oil like AMS 10-40w (high zinc) these ej205ís love to consume bearings and the better oil plus the zinc to help protect bearings is a way to improve reliability.
Cool, yeah, someone mentioned 5/40w Rotella but I may pay for the insurance of something else. after the little charade at the tune shop I want to make this one right. The replacement engine only has 38k on it so any failures will be on me vs the old engine with 150k that I have no history on.
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Old 09-09-2018, 10:40 AM   #4
awcforever
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Default

After a good bit of research I went ahead with the 5w/40 Rotella, seems a lot of successful high end builds are using it and itís got a good mixture of zinc and detergents when compared to some racing oils like Lucas and Royal purple.

I installed my head studs on one side but I had to pull the head on the other and Iím going to go ahead and remove everything again to clean it up. There was a good bit of carbon build up and I donít want to have to pull the engine again. Definitely a different animal though, pistons, oil pan, coolant feed lines, etc. a lot of the JDM stuff Iím keeping though like the coolant feed lines. Their location makes a lot more sense than the way they routed the USDM lines. Man, lots of work to do though.
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