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Old 10-23-2005, 03:13 PM   #1
Bud Brown
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Default Boosting my car to 20psi...

It should pe possible, and I have all of the turbo kit equipment lined up, now all i need to do is find engine internals for my '97 2.5L DOHC EJ25.
I'm really gonna have to reaplce everything pretty much... pistons, rods, crank, cams, valves, head, that should be enough, right?
Any one have any good places for internal parts for my engine? Do the 2.5L sti internals fit?

thanks in advance!
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Old 10-23-2005, 03:22 PM   #2
PHATsuby
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to stock is a project too

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ej257=done.

Ben
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Old 10-23-2005, 04:45 PM   #3
Sko
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well what I'm trying to do is pair an STi shortblock with custom forged pistons (stock sti pistons are ok, but not much past 350chp, though many people don't have much trouble past 350chp, it is recomended to get aftermarket ones). Also going to pair that with wrx cylander heads/intake manni/throttle body. Should be a beast if all goes well.

Nick
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Old 10-23-2005, 06:24 PM   #4
Bud Brown
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yeah i have decided on a ej257 short block, and just use my current head so i wont have a mess of wiring.
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Old 10-23-2005, 06:28 PM   #5
PHATsuby
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to stock is a project too

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ok, whoever says nothing past 350chp is full of it, or a terrible tuner/has no idea what they are talking about/trying to sell you more parts. Just my opinion. there are stock blocks doing 350WHP daily no problems whatsoever, 400whp even.

I dont have a problem with upgrading, your car will be setup for big hp, but please don't say things like that on the forums if you do not know because it just adds to everyone's misconception that the stock pistons are weak.

Ben
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Old 10-23-2005, 06:50 PM   #6
White 2.5rs
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Hydra+HMist+PPG+35R=DEATH

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the stock pistons are alright

but from what ive read/heard/seen as far as i can tell

is that a good quench area is very necessary for power
hense one of the reasons my setup was knocking at 330wheel on pump <as far as i can tell>

my new pistons are for the 257 but the quench area was maximized for sohc heads
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Old 10-23-2005, 07:31 PM   #7
no-coast-punk
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You will still be fighting cylinder liner thickness no matter what you do with that short block. You should really just go with the 257, it will save much headache in the future.
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Old 10-23-2005, 08:58 PM   #8
Sko
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Quote:
Originally Posted by PHATsuby
ok, whoever says nothing past 350chp is full of it, or a terrible tuner/has no idea what they are talking about/trying to sell you more parts. Just my opinion. there are stock blocks doing 350WHP daily no problems whatsoever, 400whp even.

I dont have a problem with upgrading, your car will be setup for big hp, but please don't say things like that on the forums if you do not know because it just adds to everyone's misconception that the stock pistons are weak.

Ben
Hey man, I didn't say they wouldn't take it I said:

Quote:
Originally Posted by Sko
well what I'm trying to do is pair an STi shortblock with custom forged pistons (stock sti pistons are ok, but not much past 350chp, though many people don't have much trouble past 350chp, it is recomended to get aftermarket ones). Also going to pair that with wrx cylander heads/intake manni/throttle body. Should be a beast if all goes well.

Nick
Anyways, no need to flame bro. Peace.

Nick

Last edited by Sko; 10-23-2005 at 11:34 PM.
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Old 10-23-2005, 11:32 PM   #9
silentbob343
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Default

Quote:
Originally Posted by Bud Brown
It should pe possible, and I have all of the turbo kit equipment lined up, now all i need to do is find engine internals for my '97 2.5L DOHC EJ25.
I'm really gonna have to reaplce everything pretty much... pistons, rods, crank, cams, valves, head, that should be enough, right?
Any one have any good places for internal parts for my engine? Do the 2.5L sti internals fit?

thanks in advance!.......

STi shortblock with custom forged pistons (stock sti pistons are ok, but not much past 350chp, though many people don't have much trouble past 350chp, it is recomended to get aftermarket ones). Also going to pair that with wrx cylander heads/intake manni/throttle body. Should be a beast if all goes well.

20psi on what turbo? 20psi with a VF22 and the 257 should be fine, 290-320WHP depending on gas used. 20psi with a SZ55 and yeah forged might be better insurance.
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Old 10-24-2005, 12:54 AM   #10
PHATsuby
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to stock is a project too

Default

Quote:
Originally Posted by Sko
Hey man, I didn't say they wouldn't take it I said:



Anyways, no need to flame bro. Peace.

Nick
I am not flaming you, I just disagree with the info about them being ok but not much past 350chp. That's all, the rest is just frusteration at misinformation, not you, sorry if it seemed that way.

Ben
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Old 10-24-2005, 01:15 AM   #11
Sko
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Ok, ^^

Nick
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Old 10-24-2005, 02:40 AM   #12
Sko
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Quick question... kinda on topic still... after replacing my stock shortblock with an STi one, would the rest of the engine be able to handle 20psi or so for a good 50k+ miles?

Somone was saying swapping the heads, the intake manni, and the throttle body would be in my best interests, but sourcing them is kinda annoying b/c some people (not all some) want top dolla for their engine parts (although used) and yea... just annoying.
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Old 10-24-2005, 10:45 AM   #13
White 2.5rs
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99RS TWE&SCAT EJ257
Hydra+HMist+PPG+35R=DEATH

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the only "top dollar" items ive seen for sale are sti heads, but thats because theyre VV, only a year or 2 old, and usually have low miles on them...so theyre really not all that expensive

yes at 20psi you should be good for atleast 50k miles, but its also gonna depend on how much power youre making at 20psi
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Old 10-24-2005, 04:35 PM   #14
Sko
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I'd probably be making 375-450 if I decide to do this, at 20psi or so, I'm guessing too, I'm sure the engine could handle 400whp though, but I dont need that much power, I think 400 hp is frickin fast as hell! Especialy in the lighter GC8.

What's your setup for your car, white?
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Old 10-24-2005, 06:27 PM   #15
White 2.5rs
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99RS TWE&SCAT EJ257
Hydra+HMist+PPG+35R=DEATH

Default

old setup was -
stock ej257
99sohc heads w/ TWE cams/springs/retainers
Forced Performance 20G TD-06h turbo
invidia turboback
rc 650cc injs
link plus
custom fmic


new setup-
bigger fmic
reverse manifold
gt35r
rc800-900cc injs
hydra
ported and polished heads by TWE, still with cams/retainers/springs making them "stage III" or something
TWE pistons
Scat rods
crawford is going to balance and polish my crank as well

old setup netted me 319whp on pump and 342whp on race, this was on 92 octane and a mustang dyno, and on the race gas tune jeff sponaugle said he made it so it should accept 104 <i had 110 in it iirc>

new goals are 500 whp and possible 600whp with no2...i just dont know if i wanna keep spending money on this freaking car

but as best i can remember, there are plenty of people on the boards using stock blocks/stock everything making 380wheel or so with plenty of miles on them, just dont go into boost every minute and dont rev it really high

an engine is only going to turn over so many times
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