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Old 07-31-2005, 12:42 PM   #1
Bud Brown
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Location: Connecticut
Default if my 97 legacy GT sees boost...

how high can i boost it with what i have, do i have everything or am i mising parts, and if i was to boost more, what would i need to replace with stronger parts? (EJ25)

I currently have...

- T3/T4 Turbo
- 2.5" Up-pipe and Catco Hi-Flow Down-Pipe
- Intake & Charge Pipe
- TMIC Intercooler
- Turbo Mounting Bracket
- Fuel Pressure Regulator
- Oil Pan with pre-tapped oil return
- Oil Lines (braided lines)
- J & S Safegaurd Individual Cylinder Knock Protection
- VC2 Voltage Clamp
- 4 NGK Hi-Performance Iridum Spark Plugs
- Vaccum Lines

thanks in advance!
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Old 07-31-2005, 05:50 PM   #2
TrickNipple
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Default

I dont know what kind of compression the EJ25 has but I think that it will be able to handle more bust if you lower the CR with shorter connecting rods. Also go check out the aftermarket forced induction forum. They might be able to help you out too.
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Old 07-31-2005, 06:32 PM   #3
LegacyJones
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I think you can run 8- 10 lbs. Not to sure!! Try a safc.
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Old 07-31-2005, 06:35 PM   #4
Russell Rogers
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1999 www.prjct1.com
I'm Ron Burgundy?

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go into the aftermarket forced induction section and ask. from my understanding.... 8
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Old 07-31-2005, 06:48 PM   #5
subiekid
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1995 Legacy TURBO!!!
EJ22T/TEC3 & '12 Civic

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You wont last long at 8. If you get an STI ej257 block or an ej22T block, you could go as high as the turbo would spool.

You should look into larger injectors and an ecu to control timing and fuel.
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Old 07-31-2005, 07:18 PM   #6
MitchGT
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From everything that I've read on the forced induction forum you should stay on the low side of 6psi to avoid damage. Bear in mind that this is still enough to give you signifigant HP increase.
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Old 07-31-2005, 09:09 PM   #7
Bud Brown
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Quote:
Originally Posted by MitchGT
From everything that I've read on the forced induction forum you should stay on the low side of 6psi to avoid damage. Bear in mind that this is still enough to give you signifigant HP increase.
guestimate?
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Old 08-01-2005, 02:26 AM   #8
reddevil
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1990 Legacy wagon
goes 12.387 @ 116.5

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I am intercooled, bigger injectors, but no timing control. I get knock at 8 psi plus but I am 9.5-1 compressoin, lower than you (I think).
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Old 08-01-2005, 10:30 AM   #9
Huffer
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2= 1998 BD + BK Legacy GT

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I'd get your VIN# checked by Subaru America before you boost it - I asked about my 98 GT and they told me my compression was 9.7:1

Other discussions about the 97-99 engines said they were all at 9.5:1

In comparison, 99 Impreza RS SOHC ran at 10.2:1
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Old 08-02-2005, 12:42 PM   #10
Radio Flyer
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'98 2.5 GT Wagon
Rio Red

Lightbulb

Unless I'm mistaken, the '97 GT had the first-gen 2.5l engine in it. This one runs on premium and makes 155 hp. The '98s+ had a change that let them make 165hp on regular unleaded. So, I think that the limitations may be different on the '97 vs. the later years.

General consensus that I've heard over the years was to run < 7lbs of boost. With that, the numbers are in the 210-220 range.

Bear in mind that none of this is actual experience, just years of fantasizing.
- Eric
Lil' Red '98 2.5 GT Wagon - Pics
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