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Old 04-04-2004, 12:50 PM   #1
Scooby Newbie
Member#: 31115
Join Date: Dec 2002
Chapter/Region: Tri-State
Location: northeast PA
Question some weird turbo questions

ok, i thought of something weird the other day....

--say if you had turboed your ej25 or whatever NA subaru engine and you do all the computer stuff and fuel stuff as well, but you dont do your internals at all... say, if you dont run that 5-6 pounds of boost (avo kit for example, not to say that this is what i would use, its jsut for a reference) that you would normally, but instead you get it to run at only 2-3 pounds of boost...
would that be harmful on the engines internals at all, even with the proper fuel tuning and whatnot?

--then, the other thing that i thought of runs along those same lines, but instead of running 2-3 pounds you would get it so the engine neuther has to suck in the air nor is it forced into the engine, i think it would kind of be like zeroing the vaccum pressure...
the engine wont have to work to suck the air in, and it wont be forced either, the air would just kind of be there
but i dont know if you could acheive a zero pressure with that though

i know that neither one of these will create lots of power and some people will say that it isnt worth even doing...
i want to hear what everyone else thinks of the idea...
any input would be great!
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Old 04-04-2004, 05:48 PM   #2
Scooby Specialist
Member#: 9861
Join Date: Sep 2001
Chapter/Region: RMIC
Location: Colorado Springs, CO
1999 2.35 RS-T w/NOS
Hybrid Rally Blue Pearl


I went over 30000 miles on 4.5psi with just a RRFPR for fuel management. Had no problems till i got boost happy.
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Old 04-04-2004, 07:02 PM   #3
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Chapter/Region: MWSOC
Location: Ft Wayne, IN
02 Forster-S


I run up to 9 psi on a stock MY99 bottom end and have been for over a year (about 30k mi) on WRX injectors/pump and GReddy E-manage. So far so good.

Besides, no turbo that I know of comes with a 2-3 psi spring in the wastegate... and you can't run less than the wastegate. In a nutshell, a low cfm turbo at 6 psi will be fine if you upgrade the fuel system... start turning up the boost and they run hot.
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Old 04-04-2004, 09:24 PM   #4
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Join Date: Dec 2002
Chapter/Region: Tri-State
Location: northeast PA

really, my concerns are about the strength and reliablility of the DOHC ej25 engine if you go turbo with it. i dont want to throw too much boost at it, im just looking for some extra power. thats why im asking so much and trying to think of those different things to do...

im doing as much research as i can about turboing my engine, but there is just so much more that im looking for
i would consider buying a kit, but then again, i might want to build my own, hence all the research im doing on it...
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Old 04-05-2004, 06:31 AM   #5
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Join Date: Feb 2003
Chapter/Region: SCIC
Location: Pasadena, CA
'03 WRX Wagon
'89 3S-GTE Alltrac Camry


If you want more power and don't want any chance of blowing your motor from boost, stay naturally aspirated...

Realistically though, running 4-6psi on just about any motor is reliable for long time. That's only adding about 30% to the amount of air that can normally enter the engine in N/A form... Run it safe (good fuel and timeing control) and you should have no issues. Note: boosting is addicting...

On another note... there is no difference between 'forcing' air into the engine and 'sucking' it in N/A. Its all based on pressure differentials. The cylinder always 'sucks' the air in, even at 3 bar of boost... There is just a larger pressure differential between the inside of the cylinder and the manifold, so more air get sucked in... Just a little symantics, but its an important idea to keep straight.

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