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Thread: DIY: Turbo the EJ25D

  1. #31
    SLi O.G. anothernord's Avatar
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    Re: DIY: Turbo your car

    Not a problem, I'm glad to help.

    Don't forget to use an elbow or something on your oil drain off the turbo. I didn't use one (just ran the hose) for a while, and I saw that it was getting kinked a bit. The best option would be an angled oil drain right off the turbo, but as long as it all downhill, it should be fine.

  2. #32
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    Re: DIY: Turbo your car

    I'm not sure I understand... my turbo has a directly verticle outlet (drain) for the oil. How else (what other type of fitting) would work?
    I've been to boost and back again my friends... and it was good

  3. #33
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    Re: DIY: Turbo your car

    You could get a universal oil drain flange, then put a 45 degree to a barb fitting.

  4. #34
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    Re: DIY: Turbo your car

    Ah, I see what you're driving at. How necessary would you rate changing the fitting?
    I've been to boost and back again my friends... and it was good

  5. #35
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    Re: DIY: Turbo your car

    Just make sure the drain has no possibility of backing up in any circumstance. Even if, for example, the car were tilted at a weird angle or something.

  6. #36
    t3h ub3r m3mber lord flashheart's Avatar
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    Re: DIY: Turbo your car

    i just want to add that you dont need a custom oil line. this is a common misconception. the EJ25D has the oil galley plugs for your hi pressure feed and your return line. the factory EJ205 or EJ257 oil lines work perfectly, and are cheaper
    No, no ,no I'm not insulting you, I'm describing you!

  7. #37
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    Re: DIY: Turbo your car

    Quote Originally Posted by lord flashheart
    i just want to add that you dont need a custom oil line. this is a common misconception. the EJ25D has the oil galley plugs for your hi pressure feed and your return line. the factory EJ205 or EJ257 oil lines work perfectly, and are cheaper
    I just realized this over the weekend.


    Also, if you're adventurous, you can drill out the N/A head to accept an oil drain too. The bolt hole for the bracket is even on there.

  8. #38
    t3h ub3r m3mber lord flashheart's Avatar
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    Re: DIY: Turbo your car

    yea i had a custom line that was causing all kinds of probs. so i switched to OEM lines and im never looking back. im also on a crusade to rid the world of custom oil lines! lol jk
    just trying to get info out there.
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  9. #39
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    Re: DIY: Turbo your car

    Alright, a couple new updates, check the first post. Mostly stuff relating to intercooler fitment.

  10. #40
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    Re: DIY: Turbo your car

    Soon to be added; how to do a WRX-style intake under the manifold, as well as a WRX throttle body/IACV swap, so you can get rid of the giant IACV that gets in the way of everything on the side of the manifold.

  11. #41
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    Re: DIY: Turbo your car

    Quote Originally Posted by anothernord
    Soon to be added; WRX throttle body/IACV swap, so you can get rid of the giant IACV that gets in the way of everything on the side of the manifold.
    I'm completely down for this.
    I've been to boost and back again my friends... and it was good

  12. #42
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    Re: DIY: Turbo your car

    Super awesome, time to start hoarding parts.

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    Re: DIY: Turbo your car

    wow this thread is sorta old. but hows the outback holding up to the turbo. im gonna be doing this as well. did you ever swap out intakes?

  14. #44
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    Re: DIY: Turbo your car

    Quote Originally Posted by MySubie
    wow this thread is sorta old. but hows the outback holding up to the turbo. im gonna be doing this as well. did you ever swap out intakes?
    well its not that old of a thread...
    anyways im pretty sure anothernord has been running this on his car for a couple years. my legacy is holding up great to boost. i accidently melted my boost controller and it fell apart. my car started boosting to like 9-10lbs and was just fine.

    im genuinely interested in the IACV swap. and the under manifold piping. ive been considering putting my EJ20K manifold on my car.. but if i remember right... there was some reason why i didnt use it... just cant remember why...
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  15. #45
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    Re: DIY: Turbo your car

    I ran this VF34'd/E85/12 psi setup for 8 months or so, after running a TD04 setup for 8 months, and a supercharger for a year. The ol' EJ25D gave up a couple months ago. I was running way too much timing; got one little detonation even and that broke stuff.

    As for the IACV swap, after discussing with a bunch of guys on RS2.5, we found that the WRX IACV, although it has the same plug, uses a different control scheme, and therefore isn't possible.

    As for the under-manifold inlet, it's pretty easy, you just have to take the manifold off and cut off the tabs that hold the purge solenoid on.

    I didn't get any pictures, since I ended up just using the twin turbo manifold for my new swap, but joejoe has a pretty good guide here:
    http://www.rs25.com/forums/f7/81773-pro ... ost1599103


    Edit: You probably found that the 20k manifold didn't have provisions for EGR. My 20H manifold doesn't either, but I plan to rig in a custom system. Just bend and flare some tubes.

  16. #46
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    Re: DIY: Turbo your car

    i figured that the values would be different between the two iacv. wow 12psi! im guessing the only way you can get away with that is on E. i bet your making 300CHP at least am i right? im getting an AEM EMS4 or a Gready Emanage so ill probably tune for E85 or race fuel. because my work buys 116,110, and strait E. so i can get it at work and dont have to worry about finding a gas station. we ran a 116/Ethanol mix and that stuff was AMAZING. but it was like $13 a gallon... i usually run 2 bottles of octane booster per tank in my car to keep it from detonating. also one step colder plugs is a good idea.
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  17. #47
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    Re: DIY: Turbo your car

    E85 is FTW unless your car is a daily. Even then, it's pretty fun, minus the cold start issues.

    Yeah, I figured it was around 280-300 at the crank. My new setup should be fine for 300 at the wheels on 91.

  18. #48
    t3h ub3r m3mber lord flashheart's Avatar
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    Re: DIY: Turbo your car

    whats ur new set up? how are you going to drop the compression enough to get 300 on pump gas?...
    just noticed your signature changed from "97' outback turbo" to "97' outback EJ20H"
    so thats the first gen 20TT which means its hydraulic bucket lifters right? if this is so, i would use the EJ20H short block and put your EJ25D heads on it.
    they are shim over bucket and way better. not to mention they look better. i used a set of the hydraulic heads and i didnt like them. plus im 99% sure that the ONLY difference between the EJ20H and EJ20R is the heads. the EJ20H use the same heads as the EJ20G (bucket HLA style) and the 1996 EJ25D. and the EJ20R uses the 1997-1998 EJ20G, and 1997-1999 EJ25D heads. sooooooo... if you put the EJ25D out of your car on that EJ20H shortblock, it would be more or less a EJ20R.
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  19. #49
    t3h ub3r m3mber lord flashheart's Avatar
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    Re: DIY: Turbo your car

    BTW, how did that supercharger thing work out? my buddy is obsessed with going supercharged.
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  20. #50
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    Re: DIY: Turbo your car

    Just look at my member's ride link in the sig.

    Why did I use the 20H heads? The ports are GIGANTIC compared to the old 2.5 heads, and yes, they're HLA, but my redline is at 6300 anyway, and the lifters are fine up to that point. Plus, the heads would have a much larger bore than the block, which would lead to some nice hot spots and possible detonation.

    The supercharger was fun, and I miss it, but it's really hard to make good power with those small blowers, without going centrifugal, like the Raptor kits. I would definitely do it again to a non-daily driven car.

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    Re: DIY: Turbo your car

    Quote Originally Posted by anothernord
    Plus, the heads would have a much larger bore than the block, which would lead to some nice hot spots and possible detonation.
    This is false, because of the clover shaped combustion chamber. Besides the 25 is 99.5 mm bore and the ej20 is 92 mm that means roughly 3.7mm on each side. Plus the hydraulic are noisey, and draw oil pressure meaning less oil for bearings, turbo, cams etc. Idk I don't like em that much. I never noticed the ports to be honest. Anyways

    Im gonna follow your build thread. You do some cool Shit for sure.
    Shed did you get your supercharger?
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  22. #52
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    Re: DIY: Turbo your car

    Quote Originally Posted by lord flashheart
    i just want to add that you dont need a custom oil line. this is a common misconception. the EJ25D has the oil galley plugs for your hi pressure feed and your return line. the factory EJ205 or EJ257 oil lines work perfectly, and are cheaper
    Pics of these ports? I'd love to get rid of my overly complicated (somewhat "drippy" setup).
    I've been to boost and back again my friends... and it was good

  23. #53
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    Re: DIY: Turbo your car

    Bump for this, I would like to know where the oil ports are engine, please.
    I've been to boost and back again my friends... and it was good

  24. #54
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    Re: DIY: Turbo your car

    Its just the bolt on the back of the head below the fuel pressure regulator.

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  26. #56
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    Re: DIY: Turbo your car

    Gotcha. So the oil feed is no problem, but I'm not pulling my entire heads to drill an oil return when the one in the valve cover works just as well.

    Thanks very much for the help gentlemen.
    I've been to boost and back again my friends... and it was good

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    Re: DIY: Turbo your car

    Quote Originally Posted by anothernord
    Just look at my member's ride link in the sig.

    Why did I use the 20H heads? The ports are GIGANTIC compared to the old 2.5 heads, and yes, they're HLA, but my redline is at 6300 anyway, and the lifters are fine up to that point. Plus, the heads would have a much larger bore than the block, which would lead to some nice hot spots and possible detonation.

    The supercharger was fun, and I miss it, but it's really hard to make good power with those small blowers, without going centrifugal, like the Raptor kits. I would definitely do it again to a non-daily driven car.
    +1 on the ports!
    Ej25d DOHC 2.5l ports are tiny when compared to EJ20G head ports too.

    I swapped a leaky EJ25D from a '98 Outback to a V2 STi-RA EJ20G & the ports are huge on the RA!

    It has solid lifters & OEM RA redline is like 7600rpms (fuel cut is supposedly higher) which is of no use in the '98 outback that has a 6200'ish RPM redline but the RA engine is really Silent & SMOOTH when running - I guess they were not playing when they say "Handcrafted & Tuned by STi".

    The V2 & older (1996 down) RA engines got
    5 injector intake manifolds
    Better cams
    Solid Lifters
    Closed Deck Block - even when the normal EJ20G went to an open deck design
    Forged pistons!
    Hand assembled / Balanced by a STi Tech!

    V3+ RA Belt covers say "Tuned by STi" but dropped the "Handcrafted" part of the statment

    I have not been able to get the 2-step working properly on the EManage Ultimate on this car - the car reads & logs speedo input but will not 2-step at all even with a retard value entered...?...

  28. #58
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    Re: DIY: Turbo your car

    Where do the stock oil feed lines run, on the ej25d. Im away from the car for a few weeks, but would love to know so i can do that when i get back

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    Re: DIY: Turbo your car

    Where do the stock oil feed lines run, on the ej25d. Im away from the car for a few weeks, but would love to know so i can do that when i get back

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    Re: DIY: Turbo your car

    Nice writeup! I noticed you snagged my photo of the offset clutch reservoir.
    98 Metro Hatch Daily Driver
    91 SS EJ20G Engine/Tranny/Diff Swap Build Thread Here
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