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Old 07-13-2004, 04:07 AM   #1
import111
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Default STI shortblock?

I have a FAT stage 3 kit. I have searched and found not too much info. If I got a USDM STI shortblock, what would I need to make the setup work? I assume I would need a boost controller and to get rid of the RRFPR and the stock fuel injectors and get STI fuel injectors. From what I have seen, the people w/ the STI shorty swap have stand alone ECU. Is that a must? It looks like I would have 8:1 compresion, is that correct? I am not sure if this should be in this forum or the coversion forum.
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Old 07-13-2004, 04:35 AM   #2
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u dont need a standalone

not sure on compression

search
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Old 07-13-2004, 05:40 PM   #3
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wondering if the SOHC heads would work?
dont think you need stand alone...
Trying to figure this thing out myself...
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Old 07-13-2004, 05:47 PM   #4
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Quote:
Originally posted by 3BadHabbits
wondering if the SOHC heads would work?
dont think you need stand alone...
Trying to figure this thing out myself...
They work, I dont remember the CR, but its been posted. You dont need a stand alone, but you are going to need something to tune thiers $5k+ worth of motor under your hood....
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Old 07-13-2004, 06:20 PM   #5
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well what he said but a little bit more gramatically correct...=
the CR is around 8.7 or 8.5, still good for around town/no boost but good enough for the higher end

u can use ur stock ecu, it will just run w/ less power if you dont have a turbo, but if u do, then you should use something to tune the 5k+ worth of goodies under ur hood

just get a few piggybacks unless u want a lot of power, what is it guys anything over 300 crank u might wanna go standalone? or is that even a determinant
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Old 07-14-2004, 08:07 AM   #6
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Whay hasn't anyone put a faq together for the STI Block swap? It would outline which heads could be used what mods to the intake need done ect. I am ver interested in doing this swap. I wish I could buy a preconfigured motor that just drops in and bolts with no machining and welding.
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Old 07-14-2004, 01:04 PM   #7
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Quote:
Originally posted by cpu77
Whay hasn't anyone put a faq together for the STI Block swap? It would outline which heads could be used what mods to the intake need done ect. I am ver interested in doing this swap. I wish I could buy a preconfigured motor that just drops in and bolts with no machining and welding.
There are two threads that talk about it... one even has pics of how to install on a wrx and a number of others that talk about the huge number of options there are.


The problem with an FAQ about it is there is just too much info to put in one. With a little time and research you will beable to figure out what you need.
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Old 07-14-2004, 03:27 PM   #8
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I wish I could buy a preconfigured motor that just drops in and bolts with no machining and welding.

ron@axis
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Old 07-14-2004, 06:27 PM   #9
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working for subaru help since alot of people like blowing up their stuff....i get the stuff that is replaces but still good

Wiring should still be the same because all you are doing is switching blocks. I still want to know what intake manifold to use and what exaust manifold to use.

I know the stock SOHC heads can take more boost than people realize. The great thing about the STi block is the closed deck. But looking at the 2.5 SOHC and the EJ20 casting is almost the same. So with internals from the EJ25"7" motor and a set of those ..... I dont remember what they are called.. those things that you can fill in the open deck..dont remember...used to use them with honda motors...well anyway...the EJ25 "sohc" motor could be pretty bullet proof for less money..Not to mention i have 4 of them and an EJ20 at my house..

I told my GF if she got as turbo for her he car, to get a sticker that says

I "SOHC'd" Your "DOHC"
Nick
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Old 07-14-2004, 06:31 PM   #10
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You cant build an open deck ej251 for less or equal to the cost of the ej257($1500).
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Old 07-14-2004, 06:39 PM   #11
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the sti block isn't closed deck. its reinforced or semi closed deck.
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Old 07-14-2004, 11:17 PM   #12
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So what about the fuel options? Right now I have the Walbro 255 fuel pump and a Vortech RRFPR (not sure if it's 4:1, 6:1) that came with my FAT stage 3 kit. With STI shorty running 10 or so lbs of boost I would think the RRFPR would make it run way too rich. So is getting rid of the RRFPR and stock injectors and using STI or other high flow fuel injectors the answer for fueling the STI shorty setup on an RS-T?
Ryan
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Old 07-23-2004, 01:11 AM   #13
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Quote:
Originally Posted by inpreza kid
the sti block isn't closed deck. its reinforced or semi closed deck.
Sorry that I have to be totally correct on here or someone will correct me... sorry impreza kid, i didnt mean to say that. From now on maybe I should call you when im rebuilding $hit at work just to make sure everything is going smothly

Import111:
Nothing can be toooo rich. just get a fuel controller. maybe one day you might want to turn that thing up to 20 instead of just 10
Nick
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Old 07-23-2004, 01:58 AM   #14
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Quote:
Originally Posted by 3BadHabbits
Sorry that I have to be totally correct on here or someone will correct me... sorry impreza kid, i didnt mean to say that. From now on maybe I should call you when im rebuilding $hit at work just to make sure everything is going smothly

Import111:
Nothing can be toooo rich. just get a fuel controller. maybe one day you might want to turn that thing up to 20 instead of just 10
Nick
Relax dude no reason to get touchy.
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Old 07-23-2004, 04:55 AM   #15
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So what R people with RS-T STI shortblock setup running in the quarter mile?
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Old 07-23-2004, 05:46 AM   #16
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Quote:
Originally Posted by import111
So what R people with RS-T STI shortblock setup running in the quarter mile?
um, thats a very hard question to answer...
What heads
what ecu
what turbo, injectors, intercooler, tranny, tuning, fuel, weather, track, driver, etc etc etc....

my answer... 15.5 to 11.80 depending....
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Old 07-24-2004, 10:06 PM   #17
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Quote:
Originally Posted by kaos200
um, thats a very hard question to answer...
What heads
what ecu
what turbo, injectors, intercooler, tranny, tuning, fuel, weather, track, driver, etc etc etc....

my answer... 15.5 to 11.80 depending....

Walbro 255 fuel pump, don't know what injectors I would need for STI shorty set up (right now im on stock injectors w/ RRFPR), Garret T25 dual BB, FAT top mount IC, stock 4EAT, Ignition Timing Controller, 2.5 inch TBE. What horse power and 1/4 mile would I be looking at if I put a STI shorty in my car with this setup?
Ryan
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Old 07-24-2004, 11:27 PM   #18
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Quote:
Originally Posted by import111
Walbro 255 fuel pump, don't know what injectors I would need for STI shorty set up (right now im on stock injectors w/ RRFPR), Garret T25 dual BB, FAT top mount IC, stock 4EAT, Ignition Timing Controller, 2.5 inch TBE. What horse power and 1/4 mile would I be looking at if I put a STI shorty in my car with this setup?
Ryan
About the same you got now... short block isnt going to many you more power it will let you run more boost. Which your going to need a few more toys to do.
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Old 07-24-2004, 11:50 PM   #19
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What else will I need for more boost? I thought a STI shorty, STI injectors, and 12 or so psi spring in the wastegate or a boost controller would be all I need on top of what I already have.
Ryan
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Old 08-20-2004, 04:33 AM   #20
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Been waiting for an answer on this 1 for a while. Just thought I would bump it to see if any1 responds.
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Old 08-20-2004, 08:07 AM   #21
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Dude honestly do a search, this has been discussed a trillion times and every setup is different with different results.

Type in "STI Shortblock" and I imagine you will find everything you need

Good luck...
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Old 08-20-2004, 03:12 PM   #22
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I have searched for months. I find a few STI shortblocks on WRX's but no one has quarter mile times or dyno pulls w/ RS-T STI shorty set up. I found quarter mile and dyno w/ full USDM STI version 8 engine, ECU swap. Still not what im looking for. Also no one can seem to give me a straight answer on what I would need if I have F.A.T. stage 3 kit and I want to put a STI shortblock under the hood as far as how to go about adding more fuel to compensate for more boost. I know I would need bigger injectors as my stockers wouldn't flow enough. But would my 10:1 RRFPR flow too rich at 12 or so psi or would that be just right?
Ryan
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Old 08-20-2004, 03:18 PM   #23
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I would saveup for some type of EM. I learned my lesson, and now recommend to stay away from RRFPRs and high boost.
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Old 08-20-2004, 04:11 PM   #24
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Quote:
Originally Posted by Wedge
I would saveup for some type of EM. I learned my lesson, and now recommend to stay away from RRFPRs and high boost.
Uh oh, what happened. Too much fuel? RRFPR break and U suddenly go lean? I am inquiring about this cause if my motor blows I have no other car so I will need to do the STI shortblock very fast so knowing what to get and how to set it up would help me out in that situation.
Ryan
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Old 08-21-2004, 05:45 PM   #25
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its not a fast thing
if i could do it again it would be much faster
i spent 9months or so getting my crap together for the swap as well as getting money
now im low on funds and am just wiring in the link plus which will set me back quite a bit until i can get a map to work for me
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