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Thread: DIY: Turbo the EJ25D

  1. #181
    SLi O.G. anothernord's Avatar
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    Re: DIY: Turbo the EJ25D

    I finally tore down my old EJ25D that blew up a year ago.

    The #2 rod pretzel'd itself. This was at about 16 PSI on E85, or about 330 CHP.



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    Re: DIY: Turbo the EJ25D

    Hahaha, holy hell!
    I've been to boost and back again my friends... and it was good

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    Re: DIY: Turbo the EJ25D

    Quote Originally Posted by anothernord
    I finally tore down my old EJ25D that blew up a year ago.

    The #2 rod pretzel'd itself. This was at about 16 PSI on E85, or about 330 CHP.


    yours must have been a 1999 block correct?
    the older, 48mm journal usually wont hang on to 330chp.
    what pistons were u using in that??
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    Re: DIY: Turbo the EJ25D

    It was a Phase II block (or so I thought), but the thrust was in the #5 position, so I'm not totally sure. The car had a shortblock put in before I owned. Pistons were the stock square dish kind as well, that's all I know. They weren't any obvious signs of detonation occurring, so I think the rod just gave up.

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    Re: DIY: Turbo the EJ25D

    WOW I did that when I owned my Ford Thunderbird Turbo Coupe.. It didn't like 21 psi

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    Re: DIY: Turbo the EJ25D

    thats impresive!
    No, no ,no I'm not insulting you, I'm describing you!

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    Re: DIY: Turbo the EJ25D

    So I realize I have posted in here probably a little too much BUT I just picked up another wagon the other day. It has a 2.5 with the start of a rod knock. I still have my turbo and header. Since I have to rebuild my motor anyway, is there a bearing company you guys would recommend IF I wanted to toss on the turbo and run say 8psi MAX with an RRFPR or whatever psi the stock injectors will hold up to? (I think it's 8psi for the EJ25D injectors). I would also pick up a stage 1 clutch kit to handle the boost. I like the feel of the heavy flywheel the car comes with so I'd just leave that in there (but go new of course)

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    Re: DIY: Turbo the EJ25D

    questions are good.
    ACL are the best, but remember fixing a rod knock is a little more than just 'slap new bearings in'
    its so difficult to say yes you can do this and no you cant do that.
    trial and error is the best way to know what is possible.
    and just run your plan past someone with more experience before hand.
    i never do anything risky to my car with out running it past my boss, chris.
    it just helps to have someone un-bias give feed back.
    No, no ,no I'm not insulting you, I'm describing you!

  9. #189
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    Re: DIY: Turbo the EJ25D

    Quote Originally Posted by lord flashheart
    questions are good.
    ACL are the best, but remember fixing a rod knock is a little more than just 'slap new bearings in'
    its so difficult to say yes you can do this and no you cant do that.
    trial and error is the best way to know what is possible.
    and just run your plan past someone with more experience before hand.
    i never do anything risky to my car with out running it past my boss, chris.
    it just helps to have someone un-bias give feed back.

    Thanks, I actually picked up an EJ253 short block tonight. I'll wind up rebuilding that and maybe run some boost. I had it all planned out before I went and tried to mess with Wrx heads. I was going to upgrade my fuel pump, get a 5psi waste gate spring, RRFPR, manual boost control valve and keep it dialed in at 8psi. From what I have been told the 253 short block will stand up to boost better than the 25D. Of course I will be using my 25D heads so I don't have to mess with wiring (screw merging harnesses, that's a pain). The guy I got the 253 block from also tossed in a 10mm oil pump for free.

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    Re: DIY: Turbo the EJ25D

    Quote Originally Posted by 98legacygt22
    Thanks, I actually picked up an EJ253 short block tonight. I'll wind up rebuilding that and maybe run some boost. I had it all planned out before I went and tried to mess with Wrx heads. I was going to upgrade my fuel pump, get a 5psi waste gate spring, RRFPR, manual boost control valve and keep it dialed in at 8psi. From what I have been told the 253 short block will stand up to boost better than the 25D. Of course I will be using my 25D heads so I don't have to mess with wiring (screw merging harnesses, that's a pain). The guy I got the 253 block from also tossed in a 10mm oil pump for free.

    Whoa whoa, who told you that an EJ253 shortblock will stand up to boost better??
    The pistons are porcelain, definitely Shit for boost. They are compatible with STI parts though, so if you intend to go that route swap in STI rods and pistons. NOW you're talking!!
    I've been to boost and back again my friends... and it was good

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    Re: DIY: Turbo the EJ25D

    Quote Originally Posted by Garrison
    Quote Originally Posted by 98legacygt22
    Thanks, I actually picked up an EJ253 short block tonight. I'll wind up rebuilding that and maybe run some boost. I had it all planned out before I went and tried to mess with Wrx heads. I was going to upgrade my fuel pump, get a 5psi waste gate spring, RRFPR, manual boost control valve and keep it dialed in at 8psi. From what I have been told the 253 short block will stand up to boost better than the 25D. Of course I will be using my 25D heads so I don't have to mess with wiring (screw merging harnesses, that's a pain). The guy I got the 253 block from also tossed in a 10mm oil pump for free.

    Whoa whoa, who told you that an EJ253 shortblock will stand up to boost better??
    The pistons are porcelain, definitely Shit for boost. They are compatible with STI parts though, so if you intend to go that route swap in STI rods and pistons. NOW you're talking!!
    I wonder how much I could find the sti crank, rods and pistons for although thats a big drop in compression ratio. What yeah sti or what motor should I get STI parts from? One last thing, how do I know for sure if it's an EJ253? I can tell it's a newer style 2.5 block.

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    Re: DIY: Turbo the EJ25D

    the sti and 253 cranks are the same.
    the stock rods are good for 300hp
    and the pistons are fine, but they are not compatable with vary many heads.
    the pan is a easy way to tell. if you dont have the pan, the pistons on the 253 have a weird partial dome thing.
    the 251 is almost completely flat aside from a 6cc dish.
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    Re: DIY: Turbo the EJ25D

    Quote Originally Posted by lord flashheart
    the sti and 253 cranks are the same.
    the stock rods are good for 300hp
    and the pistons are fine, but they are not compatable with vary many heads.
    the pan is a easy way to tell. if you dont have the pan, the pistons on the 253 have a weird partial dome thing.
    the 251 is almost completely flat aside from a 6cc dish.
    Yeah it's a 253 then, the pistons have what I'll call humps coming off of them. I'm actually going to hold off on turbo-ing and rebuild the 25D, clean the car up and sell it for near blue book price. Then buy a Subaru that's already turbo figure that's easier than trying to build my own setup.

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    Re: DIY: Turbo the EJ25D

    [quote=1-3-2-4]
    Quote Originally Posted by "lord flashheart":uqbtudcp
    Yes, I bought mine new for 800 with the harness so finding one use for less shouldn't be hard. but if he lives somewhere where you have OBD2 testing he wouldn't be able to pass emissions.

    They don't do OBDII testing here just sniffer.. Nor do they do visual inspections

    I haven't had my stock 97 OB checked this year at all a little mix up at the DMV and they never got back to me so I'm not complaining..

    IMHO emissions are a waste anyways I've seen so many cars here driving with a huge cloud of blue smoke you would of thought the car was on fire...[/quote:uqbtudcp]

    I take it back.. they do the OBD II test and they check to make sure you have the cats in place.
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    Re: DIY: Turbo the EJ25D

    [quote=1-3-2-4][quote="1-3-2-4":32xqxkkg]
    Quote Originally Posted by "lord flashheart":32xqxkkg
    Yes, I bought mine new for 800 with the harness so finding one use for less shouldn't be hard. but if he lives somewhere where you have OBD2 testing he wouldn't be able to pass emissions.

    They don't do OBDII testing here just sniffer.. Nor do they do visual inspections

    I haven't had my stock 97 OB checked this year at all a little mix up at the DMV and they never got back to me so I'm not complaining..

    IMHO emissions are a waste anyways I've seen so many cars here driving with a huge cloud of blue smoke you would of thought the car was on fire...[/quote:32xqxkkg]

    I take it back.. they do the OBD II test and they check to make sure you have the cats in place.[/quote:32xqxkkg]

    i was going to say....
    No, no ,no I'm not insulting you, I'm describing you!

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    Re: DIY: Turbo the EJ25D

    I think I'm going to go the Turbo the Ej22E way however.
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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

    Which plugs are the correct ones? I'd rather use existing provisions as often as possible instead of "creating" a place to drill and tap.
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    Re: DIY: Turbo your car

    Quote Originally Posted by LGTtoBE
    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

    Which plugs are the correct ones? I'd rather use existing provisions as often as possible instead of "creating" a place to drill and tap.
    The oil feed line is easy; you just undo the bolt that is bolted into the gallery, and put the banjo bolt and feed hard line in.

    The return line is NOT drilled into the heads. You have to take the engine out (and apart, really) to drill out the blank casting for the return. That's why I suggest returning to the valve cover.

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    Re: DIY: Turbo your car

    Quote Originally Posted by anothernord
    Quote Originally Posted by LGTtoBE
    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

    Which plugs are the correct ones? I'd rather use existing provisions as often as possible instead of "creating" a place to drill and tap.
    The oil feed line is easy; you just undo the bolt that is bolted into the gallery, and put the banjo bolt and feed hard line in.

    The return line is NOT drilled into the heads. You have to take the engine out (and apart, really) to drill out the blank casting for the return. That's why I suggest returning to the valve cover.

    Well...
    My block is out and I just put the halves back together. Is it easy to locate?
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    Re: DIY: Turbo your car

    Quote Originally Posted by LGTtoBE
    Well...
    My block is out and I just put the halves back together. Is it easy to locate?

    Here you go mate:
    http://www.rs25.com/forums/f105/t140777 ... turbo.html
    I've been to boost and back again my friends... and it was good

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    Re: DIY: Turbo the EJ25D

    I thought I'd stop by to ask a few questions about my turbo swap I have planned for my budget bomber.


    Stock set up is 5mt with fresh clutch, and stock EJ22E


    I currently have the following parts in my possession:

    TD04 from an 04 FXT
    TD04 from an 02-03 WRX (LOTS of shaft play, will be rebuilt for use as spare or to free up more funds)
    TMIC from an 04 FXT with y pipe and BPV
    TMIC from an 02-03 WRX w/o BPV
    Turbo exhaust manifold from 02-03 WRX
    Megan up-pipe from 02-03 WRX
    Stock injectors and fuel rails/piping from 02-03 WRX
    Under manifold portion of turbo inlet from 02-03 WRX

    As far as I know, I still need the following:

    Downpipe (have a line on a stock STI one)
    Turbo Crossmember (Also have a line on an STI one, understand will need to use WRX control arm bushings due to their width.)
    Turbo water pump to clear exhaust manifold
    97-99 25D heads and manifold to match block bore size and drop CR to boost friendly levels
    OEM EJ22E headgaskets
    Miscellaneous hoses, tubing, etc for water and oil feed to turbo, PCV/IACV routing

    So my questions are, am I forgetting anything? And are the EJ25D heads REALLY my best bet? I'll admit that I'm a little intimidated by the DOHC cam aspect, as well as frustrated by the spark plugs coming straight in from the sides.

    I have access to a set of SOHC 2.5 heads, pretty sure they are 251's, but am not certain. Would these heads be a reasonable, simpler option? Either way I'm going to be going all the way through whatever set of heads I end up with. If the believed 251 heads are usable, which manifold, sensors and ECU would I need? I'm under the impression that using the EJ25D heads would allow me to just continue using the 2.2 ECU.

    Sorry to blow up/hijack you guys' thread, but I'm getting close and am trying to iron out all the details!
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    Re: DIY: Turbo the EJ25D

    Don't use ej22e head gaskets, the coolant ports don't line up right with the head and you'll end up with cooling issues. The Victor Reinz ej222 gaskets are the most cost effective way to go, look them up for a 99-01 impreza.

    If you're going to do a head swap the 25d will run off your existing ecu, the 251 heads will as well but cold engine idle will be garbage and you'll have a constant cel. Unless you can find an ej18 throttle body. It has the iacv built into the throttle body similar to how the 251 does, but the phase 1 ecu will run it correctly.

    The only way you'll be able to use the wrx injectors is if you use the sohc heads, and a manifold from one without the air assist fuel injection. I can't swear by which models have it and which don't.

    The 04 fxt intercooler won't work because of the bov location, it's right in the way of the throttle linkage. You could run an 02-05 wrx throttle body and cable because it's on the opposite side, but then that leads to shit cold start idle and cel again. The 02 intercooler will require at least "massaging" of the firewall and if I remember correctly moving the ignitor and bracket. The ignitor part may have just been on the gen 1 turbo legacy, it seems like the one on my 92 ss was bigger than my 97.
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    Re: DIY: Turbo the EJ25D

    Honestly the 25D heads are better than the 251 heads anyways
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    Re: DIY: Turbo the EJ25D

    I've always thought they were as well. I remember the old arguments all over nasioc saying the 251 heads flowed better because the engine had more mid range torque than the 25d. nobody gave any credit to the higher compression or ecu tuning differences between the two.
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    Re: DIY: Turbo the EJ25D

    I would say run the FXT intercooler and just crush the head of the BPV valve. It won't cause any difference in the operation and it'll let you keep your cruise.
    the 02 is huge-mongous for the bay of an ej22, ej25 engine.
    I've been to boost and back again my friends... and it was good

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    Re: DIY: Turbo the EJ25D

    So, the complications of the DOHC is well worth it for ease of availability and over all better-ness? Copy that. Do I need the manifold for those heads or does my 2.2 manifold work?

    Anybody have any information on exactly what part number I will need for the HG's?

    I think I like the idea of using the FXT intercooler a little better, especially since I'm not at all skerd of doing a little hammer clearancing to the BPV! Is there such a thing as a low-profile BPV/BOV that would solve the problem?
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    Re: DIY: Turbo the EJ25D

    You've gotta use the 25d manifold as well.

    Victor Reinz # 54423 are the ones I've got in my high compression hybrid. which is the same as what you'll be doing but with eg33 pistons. They match the bore and the coolant ports on the 25d heads perfect.
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    Re: DIY: Turbo the EJ25D

    I believe the Phase II SOHC heads interfere with the up-pipe anyway.

    And you can't run the Phase II SOHC heads off the EJ25D ECU anyway, since the cam pickups are different.

  29. #209
    SLi Resident 86bratman's Avatar
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    Re: DIY: Turbo the EJ25D

    Some early 251s ran phase 1 cam and crank triggers.
    My 1997 Legacy L

    Fuelly

  30. #210
    SLi Lurker wentz912's Avatar
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    Re: DIY: Turbo the EJ25D

    25D heads it is then. Found a set in usable shape for $80, just gotta snag a manifold from somewhere!

    Also, anybody know anything about a low pro Bob/NOV? My google search skills bring the suck.
    08 OBP OBXT
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    -Nic

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