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Old 01-08-2006, 03:43 PM   #1
nix-hex
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Default how do you turn 2.5 RS engine into sti?

what would i have to do to my 2.5 RS engine to make it sti spec, or damn near close? or if it turns out that all i would be using from my engine is the block, would it be better to just buy an sti engine? what are you thoughts and maybe a list of parts to get.

thanks
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Old 01-08-2006, 03:59 PM   #2
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Nothing is the same between the two.
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Old 01-08-2006, 04:12 PM   #3
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yeah the block isn't even close either
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Old 01-08-2006, 04:41 PM   #4
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get STI internals and install them into your 2.5 block
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Old 01-08-2006, 05:07 PM   #5
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Quote:
Originally Posted by Kostamojen
Nothing is the same between the two.
Quote:
Originally Posted by Jaxx
yeah the block isn't even close either
Quote:
Originally Posted by 02Toyowrx
get STI internals and install them into your 2.5 block
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Old 01-08-2006, 05:27 PM   #6
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and if you notice (inorder):


Guru

Guru


newbie




easiest way, buy the Ej257 motor. your block is different and you have sohc
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Old 01-08-2006, 05:43 PM   #7
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Quote:
Originally Posted by bmxpunk
and if you notice (inorder):


Guru

Guru


newbie




easiest way, buy the Ej257 motor. your block is different and you have sohc

Honestly, the newbie's right. 257 internals will fit a 25D/1 block, and the block halves themselves are pretty stout. There's a couple guys over on rs25 running GT30/400whp setups on built 25ds.

If it was me, I'd buy a 257 sb at the dealer rather than build one, but it is very doable.
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Old 01-08-2006, 08:53 PM   #8
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He could do the internals with sleeves and be better off than a 257... but prolly over the price of a 257. I guess if he wanted the motor to stay correct in the car, then...
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Old 01-08-2006, 10:28 PM   #9
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Quote:
Originally Posted by bmxpunk
and if you notice (inorder):


Guru

Guru


newbie




easiest way, buy the Ej257 motor. your block is different and you have sohc
The newbie/guru status on this forum, from my experiences, does not equate to knowledge or skill whatsoever. I seen "newbies" that know what they are doing and "gurus" who don't have a clue and vice/versa
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Old 01-08-2006, 10:48 PM   #10
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Quote:
Originally Posted by americanyouth
Honestly, the newbie's right. 257 internals will fit a 25D/1 block, and the block halves themselves are pretty stout. There's a couple guys over on rs25 running GT30/400whp setups on built 25ds.

If it was me, I'd buy a 257 sb at the dealer rather than build one, but it is very doable.
The question was "what would i have to do to my 2.5 RS engine to make it sti spec, or damn near close?" not, "how do I make my 2.5RS engine better suited for a turbo?"
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Old 01-08-2006, 11:04 PM   #11
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ok so basically i should buy an sti engine, cus a friend of mine said that would be the way to go cus of this open/closed deck thing he said. not too sure on what that means but i will in the next year as i am attending UTI on the 30th this month so i will no longer be a newbie to engine building. yeah and i know about the dohc swap too. but if it wanted, could i just buy the internals and the heads and just build her really strong to take alot of boost? or maybe explain to me about this open/closed deck thing my friend's talking about so ill know why some say to just buy the sti engine. and one more thing, if i get the engine, obviously buy the 6 spd tranny too right? i know they're alot stronger and would then continue it on back to the diff. screw this is long enough, im just gonna play the lotto alot and when i win, completely swap the engine trannny and whole drivetrain shabang into my car. problem solved. anyone ever do that to a two door chassis? damn i write too much......
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Old 01-08-2006, 11:06 PM   #12
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So, is the point of this theoretical engine for boost or just power? Cause thats 2 different scenarios.
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Old 01-08-2006, 11:08 PM   #13
nix-hex
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ah yes, better question Kostamojen. i know i can run about 5 psi on stock internals and would be the most cost effective thing to do. right now i basically want turbo because my car has a hood scoop for a reason! everyone who knows something about subarus i meet ask if its a turbo wrx and i sadly shake my head and stare at the ground and reply no. so yeah, whats the best and cheapest, in cost, not part quality, to turbo my car with tuning effectively without having to replace internals. and if the DOHC's would help, should i buy them? and maybe what about sti fuel system and intake manifold too? and the intercooler, should i just go for the gusto and get the sti one? sorry, i know these are alot of questions but its better to ask pros what you dont know then to screw it up
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Old 01-08-2006, 11:36 PM   #14
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Quote:
Originally Posted by nix-hex
ah yes, better question Kostamojen. i know i can run about 5 psi on stock internals and would be the most cost effective thing to do. right now i basically want turbo because my car has a hood scoop for a reason! everyone who knows something about subarus i meet ask if its a turbo wrx and i sadly shake my head and stare at the ground and reply no. so yeah, whats the best and cheapest, in cost, not part quality, to turbo my car with tuning effectively without having to replace internals. and if the DOHC's would help, should i buy them? and maybe what about sti fuel system and intake manifold too? and the intercooler, should i just go for the gusto and get the sti one? sorry, i know these are alot of questions but its better to ask pros what you dont know then to screw it up
you can run 10 on the stock engine if its got a great tune. possibly standalone EM. you have a 99, im not sure if that has the 9.7:1 CR or 10:1. either way you could do 10 on the stock motor if you have your tuning down.
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Old 01-09-2006, 12:12 AM   #15
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Quote:
Originally Posted by nix-hex
ah yes, better question Kostamojen. i know i can run about 5 psi on stock internals and would be the most cost effective thing to do. right now i basically want turbo because my car has a hood scoop for a reason! everyone who knows something about subarus i meet ask if its a turbo wrx and i sadly shake my head and stare at the ground and reply no. so yeah, whats the best and cheapest, in cost, not part quality, to turbo my car with tuning effectively without having to replace internals. and if the DOHC's would help, should i buy them? and maybe what about sti fuel system and intake manifold too? and the intercooler, should i just go for the gusto and get the sti one? sorry, i know these are alot of questions but its better to ask pros what you dont know then to screw it up
Ya, you definatly want to check the aftermarket forced induction forum for this question. Theres alot of info there about what you can do.

Your cheapest option is to put together a turbo kit yourself, which if done right will be around $2000 including simple engine management.
If you are concerned about blowing up your motor, you probably want an EJ257 shortblock (STI) to lower the compression among other things I dont know everything about. That would make it closer to $4000 for everything if not more.

However, if you are concerned about legality and such, this is not the best route to go.
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Old 01-10-2006, 02:41 AM   #16
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save yourself a headache, buy an STi engine
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Old 01-10-2006, 02:45 AM   #17
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now there is a good idea!!!
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Old 01-12-2006, 10:21 AM   #18
rs2.5-3.0
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just get a 1.8 and strap on a blower a 400 shot nitrous-


seriously though, sti motor swap, upgrade the clutch (and exhaust if you desire)
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Old 01-12-2006, 10:26 AM   #19
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Quote:
Originally Posted by Kostamojen
Nothing is the same between the two.
displacement? and brand? so i'm a smart a$$, sue me!
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Old 01-12-2006, 10:37 AM   #20
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a WRX swap can be had for around 4-5k and that would be your most reliable route.
if you want to go with an STI swap you are looking at 6-7k
that would also be very reliable and more powerful than the WRX swap.
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Old 01-12-2006, 12:11 PM   #21
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Don't turbo your stock engine, its not worth your time. Unless your going to throw a 257 shortblock, have your DOHC heads built buy an AEM/motec/linkplus and then go turbo. If your not going to do the following, its not worth the MONEY and TIME invested. Do a swap and be happy with stock power. When the boost buy bites...I said when not IF, you will have some easy upgrades ahead of you (engine management, turbo back exhaust, intake, intercooler....)

I had a built 2.5rs, I know the people locally who build up subarus. I know most of the flashy import motor builders. Been there done that, got a t-shirt. I own a swaped wagon now...used to own a built 2.5L 2002 2.5rs w/ big turbo, link plus ecu and built auto tranny (can we say built drag car?) Now I run a swaped car with a 6 speed. Its just easier, more reliable, cheaper (inital costs are a little more then just turboing your rs...but the payback on the backend is worth it) and to top it all off, you will LEARN MORE doing a swap then a build up. Swaps are a good strait forward way to learn about cars without going over the deepend.
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Old 01-12-2006, 01:03 PM   #22
bmxpunk
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Quote:
Originally Posted by americanyouth
Honestly, the newbie's right. 257 internals will fit a 25D/1 block, and the block halves themselves are pretty stout. There's a couple guys over on rs25 running GT30/400whp setups on built 25ds.

If it was me, I'd buy a 257 sb at the dealer rather than build one, but it is very doable.
that is what I meant. I know that the internal will fit, we are going to do it to my friends RS (hes a suby tech, 1 of 2 in town here) but if you arent getting the parts for cost and have 3 other spare blocks why not just do it right the first time?

I understand that the newbie and guru and specialist titles mean little but kostamojen and Jaxx, from my observation are pretty knowledgeable.

But if it were me, I would just get the 207 or 257 short block (well if I wasnt obsessed with the dinosaur ej22t )
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Old 01-12-2006, 01:06 PM   #23
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Quote:
Originally Posted by DoctorNick
Don't turbo your stock engine, its not worth your time. Unless your going to throw a 257 shortblock, have your DOHC heads built buy an AEM/motec/linkplus and then go turbo. If your not going to do the following, its not worth the MONEY and TIME invested. Do a swap and be happy with stock power. When the boost buy bites...I said when not IF, you will have some easy upgrades ahead of you (engine management, turbo back exhaust, intake, intercooler....)

I had a built 2.5rs, I know the people locally who build up subarus. I know most of the flashy import motor builders. Been there done that, got a t-shirt. I own a swaped wagon now...used to own a built 2.5L 2002 2.5rs w/ big turbo, link plus ecu and built auto tranny (can we say built drag car?) Now I run a swaped car with a 6 speed. Its just easier, more reliable, cheaper (inital costs are a little more then just turboing your rs...but the payback on the backend is worth it) and to top it all off, you will LEARN MORE doing a swap then a build up. Swaps are a good strait forward way to learn about cars without going over the deepend.

this post should be sticked
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Old 01-12-2006, 01:11 PM   #24
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maybe if my english was better I would agree with ya
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Old 01-12-2006, 05:45 PM   #25
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ok thanks for all the info. well looks like im bustin out that piggy bank and savin up for an sti swap. should i get the 6 speed tranny as well? and, does anyone know why the hell subaru stripped down the RS when it came over here and didnt just leave it as the type r?
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