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Old 02-20-2018, 11:10 AM   #1
sorrowfulkiller
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Member#: 170439
Join Date: Jan 2008
Location: Sioux Falls, SD
Vehicle:
I <3 Lamp

Default 99 Outback engine rebuild... boost?

I've got a 99 Outback with the ej25D phase 2 bottom end and phase 1 heads.

Bought the car recently and have pulled the engine with my wife to put all new gaskets in and re seal it back up. The stock pistons look fine and the bores have great crosshatching which is surprising considering it has 230k miles on it. Inside of the engine looks immaculate aside from carbon deposits. I have a gt2554 turbo sitting in my garage begging to be put into something. I know the stock compression ratio on this engine is something like 9.7:1 but if I put ej255 pistons in, it should drop to about 8.5:1. My thought is to possibly drop some stock ej255 pistons in that were pulled from a low mileage car getting forged pistons, then run stock ecu with the gt2554, wrx top mount, and a sti fuel pump for awhile. I'm planing on making my own uppipe and downpipe since I have a welder and fabrication experience. Then when I finish figuring out all the wiring I would drop in a microsquirt based diypnp ecu with some sti 565cc injectors.

Not looking for gobs of power obviously, but I do want some semblance of reliability for relatively cheap. Keep in mind I already have the injectors, ecu, and wrx top mount intercooler. I've yet to buy pistons for obvious reasons, same with the sti fuel pump.


My question is, would ej255 or ej257 stock pistons and stock ecu combo be reliable enough for a couple months without issue if I ran 91?




TLDR
I Have...
  • 99 outback with EJ25D, taken apart in garage
  • GT2554 Turbo from a saab 900 (7psi wastegate)
  • 565cc STI side feeds
  • 02 WRX top mount intercooler
  • DIYPNP Megasquirt ecu

I may need...
  • ej255 or ej257 pistons and rings, used probably.
  • wrx or sti fuel pump

Should I slap the turbo pistons in and run the stock ecu til I put the megasquirt in with the 565cc injectors?
Overall this only should cost me an additional $200 or so since I should be able to scrounge up enough steel pipe for the uppipe and downpipe.
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Old 02-20-2018, 11:35 AM   #2
Patrick Olsen
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Member#: 120
Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
1996 Impreza coupe

Default

I imagine you'll get more feedback (and find a ton more information to search through) in the Normally Aspirated with bolt-on Forced Induction technical forum.
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Old 02-20-2018, 12:04 PM   #3
sorrowfulkiller
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Member#: 170439
Join Date: Jan 2008
Location: Sioux Falls, SD
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I <3 Lamp

Default

Quote:
Originally Posted by Patrick Olsen View Post
I imagine you'll get more feedback (and find a ton more information to search through) in the Normally Aspirated with bolt-on Forced Induction technical forum.
****, I thought I remembered that was a sub-forum!

Can a mod please delete this thread, I will start a new thread there instead.
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Old 02-20-2018, 12:10 PM   #4
Charlie-III
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Member#: 30669
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: USA, North NJ, 07456
Vehicle:
1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

Default

A bit OT.......

When I was on the COBB forum, there was a member that was in SF SD. I did a ton of business travel and would post in the general forum, "Where is Charlie going to be.....?" With a date and location.
There was a guy with a WRX that lived in SF SD and I met him a couple times (met about 80 forum members all across the US not counting the first COBB meet in SLC after their move, but that's another story....). I met him maybe 8 years ago?
My site was north side of town, take the highway north, get off at an overpass, head west about a mile to a boring looking datacenter with fierce looking fences all around.

Anyway, yes, looking into either conversions or "NA with FI" on THIS forum would yield more info.

PS, if you know who I'm talking about, say hi for me......I was "Charlie" on that forum.....
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