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Old 05-10-2016, 11:08 AM   #1
00LGTP
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1995 EJ253/D25 GC
371hp/355tq 1.5xtr 93oct

Default 371hp/355tq - Open deck EJ253/D25 1.5xtr 10cm 93oct

Hey guys, this thread is a carry over from one in built motor discussion. But with final dyno numbers!

Original thread here:
http://forums.nasioc.com/forums/show....php?t=2784050

Realistic goal is around 350AWHP/TQ
---- Actual 371hp/355tq @21psi 5/9/16

here are the build specs, will post more pics tonight/tomorrow.

Engine: Thanks to SIMER!

-EJ253 - cleaned, decked, bored +0.25mm and honed [w/torque plate] to .0035" PTW clearance (Mahle's spec)

- USDM EJ257 - 79mm stroke - cleaned, polished, journals measured and inspected for straightness

- Mahle's PowerPakPlus Piston Kit (WRX209927P22) - 99.75mm, 8.5:1 CR, 2618 forged
(top ring - .020") - (2nd ring - .013") - (oil rings - .015")

- USDM EJ257 forged rods - cleaned and inspected

MAIN BEARINGS: King MB5382XPG
(1- .0015")--(2- .0015)--(3- .0017)--(4- .0017)--(5- .0016)--(Thrust- .0030)

ROD BEARINGS: King CR4125XPG STD
(1- .0016")--(2- .0015)--(3- .0015)--(4- .0015)

Heads:
- Bone Stock ej255. Cleaned/lapped valves with new valve seals
- Stock STI HG
- 8.8:1 CR estimated
- ARP HeadStuds 30-60-90

Turbo/Intake/Exhaust
- Blouch 1.5XTR 10cm
- 4-1 UEL Header 2.25 catless up
- 3" catless turbo back
- Custom 2.5i reverse intake manifold
- Custom 2.5" intercooler
- 2.5 turbo inlet
- 19mm IM spacers to clear AVCS (not using AVCS
- Tial 38mm EWG 1BAR spring
- Tial Q BOV

Other Misc
- 02-03 WRX ECU/Electronics
- Grimmspeed EBCS
- Cosworth cam sensor bracket
- 1000cc ID injectors
- 255 Walbro
- Stock Fuel rail/Pressure reg
- Cobb AP V3 (Will be a Speed Density Tune)
- Competition Clutch stage 2
- 05 Legacy GT Trans with LSD
- 16 row oil cooler
- 11mm oil pump
- 1 step colder ngk plugs

Break in using 10w40 dyno oil:
- 30min of idle/operating temp. Changed Oil/Filter
- Drove 25miles lightly. No Boost. Changed Oil/Filter
- Drove 250 miles. 1-3 PSI, Changed Oil/filter
- Drove 650 miles 1-10PSI, Changed Oil/Filter
- Drove 300 miles 1-15Psi, Changed Oil/Filter
- Tune was at 1225ish miles

Max RPM during break in was 5k, did lots and lots of 3-5k pulls of partial throttle, engine break down to 3k, and did it over again. Magnetic drain plug is a must!

Compression on cold engine after 1000 miles was 130psi across the board















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Last edited by 00LGTP; 05-10-2016 at 11:38 AM.
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Old 05-10-2016, 11:19 AM   #2
tank the ek
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This thing might hurt some feelings.
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Old 05-10-2016, 11:44 AM   #3
Delphi
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Such an awesome build. Hope the block lasts you. But I would imagine if a semi closed ej255/257 block can live at 500+whp for long periods of time that this should be able to take it.
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Old 05-10-2016, 12:50 PM   #4
monkeyposeur
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Nice build!
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Old 07-29-2016, 05:24 PM   #5
00LGTP
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371hp/355tq 1.5xtr 93oct

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3400 miles and going strong! Not a single issue

-oil changed with 10w/40 dyno oil at 1000 miles intervals past break in
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Old 09-28-2016, 11:59 AM   #6
00LGTP
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371hp/355tq 1.5xtr 93oct

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4300 miles still rock solid! Had a minor oil leak from one of the cam gear holes from the AVCS i plugged, easy fix.

Still on Dyno 10w-40 oil. Next oil change at 5k I will switch to synthetic.
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Old 09-28-2016, 01:31 PM   #7
wingman358
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Nice build. I'm a bit curious about your compression numbers tho, isn't 130 near the bottom end of the spec? Or is that just cause you measured cold? My tired, stock 04 WRX is ~127 psi all around and the spec is 128 psi minimum I think.

Last edited by wingman358; 09-28-2016 at 03:26 PM.
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Old 09-28-2016, 04:43 PM   #8
Paul
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Really no need to worry about lower numbers if they are all similar and doing it on a cold motor can drop 15-20psi. Also testers can vary from one to another.

OP: Is the top black line the boost graph? According to that you don't see full boost until 4800 which seems kinda late but if I was just looking at the TQ curve I would have guessed 4200-4500. I'm sure that NAintake manifold is causing that and pushing whole curve to right tho
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Old 09-28-2016, 04:45 PM   #9
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looks good. i was hoping on a built 2.5 the spool would be faster for the 1.5 XTR. whats going on with that? many other DYNO you see the TQ come way sooner.
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Old 09-28-2016, 05:37 PM   #10
00LGTP
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371hp/355tq 1.5xtr 93oct

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Quote:
Originally Posted by bmxhotsauce View Post
looks good. i was hoping on a built 2.5 the spool would be faster for the 1.5 XTR. whats going on with that? many other DYNO you see the TQ come way sooner.
Running a 10cm exhaust housing and no AVCS. Tuner could have done something with the tune to help but still on stock rods so airing on the side of caution to make everything some in more gradual.

Quote:
Originally Posted by Paul View Post
Really no need to worry about lower numbers if they are all similar and doing it on a cold motor can drop 15-20psi. Also testers can vary from one to another.

OP: Is the top black line the boost graph? According to that you don't see full boost until 4800 which seems kinda late but if I was just looking at the TQ curve I would have guessed 4200-4500. I'm sure that NAintake manifold is causing that and pushing whole curve to right tho
Yes, tuner said he saw a big improvement in the top end with the NA manifold and 10cm housing. Black line is boost. Correct.

Quote:
Originally Posted by wingman358 View Post
Nice build. I'm a bit curious about your compression numbers tho, isn't 130 near the bottom end of the spec? Or is that just cause you measured cold? My tired, stock 04 WRX is ~127 psi all around and the spec is 128 psi minimum I think.
Did a compression test with less then 1000 miles/still in break in and on a cold engine. I haven't noticed any oil burning on the dip stick. Only running a Grimmspeed AOS right now.
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Old 09-28-2016, 07:58 PM   #11
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really odd. seems to hit TQ late in my opinion. i wanted to go with the turbo for auto x and road racing. maybe need to go a different route. good power anyways tho
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Old 08-02-2017, 08:13 AM   #12
pcampbell
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Sorry I know this is old but... any concerns about this much power with the ej253 block?
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Old 08-03-2017, 03:16 PM   #13
Rizen
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Quote:
Originally Posted by bmxhotsauce View Post
really odd. seems to hit TQ late in my opinion. i wanted to go with the turbo for auto x and road racing. maybe need to go a different route. good power anyways tho
He already addressed this. No AVCS, 10cm exhaust housing.
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Old 08-04-2017, 05:55 PM   #14
Ride4
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I have a similar build to 00lgtp. Im running an ej253 block mating with s20 heads and arashi 60-1 turbo. At 22 psi on airboy dyno, I'm putting down 413whp and 425tq. I'm still running the stock wrx headers Lol. I've been running this setup over a year with zero issue so I don't see the point of paying $$$ for a semi closed deck block when I can get a ej253 short block for 100 at the junk year. Lol by the way my 1/4 time is 12.4 at 120mph with a 2.2 60ft
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Old 08-04-2017, 09:46 PM   #15
pcampbell
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Nice! How much do you think it runs to build up the ej253 short block? Sti rods and forged pistons, stock crank, new bearings? What about honing and cleaning block? Thanks.
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Old 08-05-2017, 01:01 PM   #16
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Quote:
Originally Posted by pcampbell View Post
Nice! How much do you think it runs to build up the ej253 short block? Sti rods and forged pistons, stock crank, new bearings? What about honing and cleaning block? Thanks.
why dont you buy a short block from subaru and change out the pistons?
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Old 08-05-2017, 02:23 PM   #17
pcampbell
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Default 371hp/355tq - Open deck EJ253/D25 1.5xtr 10cm 93oct

Quote:
Originally Posted by subaru_gc8 View Post
why dont you buy a short block from subaru and change out the pistons?


Definitely an option although not cheap.
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Old 08-05-2017, 03:17 PM   #18
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Quote:
Originally Posted by pcampbell View Post
Definitely an option although not cheap.
Cheaper than building a block, you figure its 2000 from subaru and 500 for dropins goinf to cost 1000-1500 to recondition the block at least
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Old 08-06-2017, 12:35 AM   #19
Ride4
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To build an ej253 is dirty cheap if you know what you're doing. I spent about 500 on parts to build my short block. Lol that includes ebay stock sti pistons, rings, bearings, used sti rods, and oem sti head gaskets. I ported match the s20 heads to the cylinder bore and did the labor myself. Save $$$ for turbo. Lol all and all I spent about 550 to build my long block and don't say my setup is ghetto because its not and haven't given me one single problem beside a oil leak at the valve cover grommet. So like I said above a brand new ej257 is not worth my money. That money goes to a nice arashi turbo.
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Old 08-07-2017, 12:48 PM   #20
pcampbell
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Default 371hp/355tq - Open deck EJ253/D25 1.5xtr 10cm 93oct

Quote:
Originally Posted by Ride4 View Post
To build an ej253 is dirty cheap if you know what you're doing. I spent about 500 on parts to build my short block. Lol that includes ebay stock sti pistons, rings, bearings, used sti rods, and oem sti head gaskets. I ported match the s20 heads to the cylinder bore and did the labor myself. Save $$$ for turbo. Lol all and all I spent about 550 to build my long block and don't say my setup is ghetto because its not and haven't given me one single problem beside a oil leak at the valve cover grommet. So like I said above a brand new ej257 is not worth my money. That money goes to a nice arashi turbo.


What does it cost to prepare the block? I think I can assemble myself but unfamiliar with necessary cleaning honing etc.

Last edited by pcampbell; 08-07-2017 at 02:01 PM.
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Old 08-08-2017, 01:39 AM   #21
Ride4
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Quote:
Originally Posted by pcampbell View Post
What does it cost to prepare the block? I think I can assemble myself but unfamiliar with necessary cleaning honing etc.
My machinist charge 180 to clean, deck the block, and bore the cylinder to whatever size piston going in the block.
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Old 08-08-2017, 08:29 AM   #22
pcampbell
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Quote:
Originally Posted by Ride4 View Post
My machinist charge 180 to clean, deck the block, and bore the cylinder to whatever size piston going in the block.


Thanks for the info!
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Old 08-08-2017, 12:08 PM   #23
Ride4
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Quote:
Originally Posted by pcampbell View Post
Thanks for the info!
I hate seeing people get ripped off by paying a ton on a build and not even making the kind of power I'm making. When I tell people about my build, they laugh and say it won't last, but hey I have been pushing 400whp for over a year now with no issue. By the way the car is my commuter.
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