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Old 07-29-2003, 03:11 PM   #1
Burke
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Member#: 38939
Join Date: Jun 2003
Vehicle:
2004 STI
Black w/ Gold Rims

Default manual boost controllers

So will the manual boost controllers for the WRX fit on the STI? Has anyone used one of these to boost their STI? Is it worth it or risky if you only bump a few PSI?
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Old 07-30-2003, 10:13 AM   #2
Burke
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2004 STI
Black w/ Gold Rims

Default

Nobody has tried one of these yet? Not even on a WRX?
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Old 07-30-2003, 10:29 AM   #3
Obsidian
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Member#: 5627
Join Date: Apr 2001
Chapter/Region: South East
Location: Charlotte, NC
Vehicle:
06 WRX STi
Black

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A boost controller is simply a solenoid (EBC) or a valve that hides boost from the wastegate actuator arm. They simply plug into the vaccuum lines between the turbo and actuator. So, yes you can use a MBC on your STI should you feel so inclined.

--Matt
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Old 08-04-2003, 04:00 AM   #4
rlavalle
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Join Date: May 2002
Location: Seattle 'burb (Kirkland)
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2004 STi: 580 AWHP
Java Black Pearl

Default

I installed a Manual Boost Controller onto my STi... These work better in some ways on the STi than on the WRX...

On the WRX, there was always the issue of unwanted full boost at partial throttle (like when going up a long hill). This could cause a lean condition where the computer's getting more air than it expects since it isn't programmed to work with all this boost at lower throttle settings.

The STi doesn't have this issue.

The STi ECU is a little sensitive about getting overboost. If it sees 17.5+ psi for a couple seconds, it throws a CEL.

Just keep the Boost controller set to about 16 or 16.5 psi.

Russ
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Old 08-04-2003, 07:06 PM   #5
Burke
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Member#: 38939
Join Date: Jun 2003
Vehicle:
2004 STI
Black w/ Gold Rims

Default playing with boost

Has anyone done any dynos with different pressures to see the horsepower rating improvment per PSI?
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Old 08-04-2003, 07:17 PM   #6
Tuning Factory Inc.
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Location: Detroit, Michigan, USA
Default

I did the Turbo XS HPBC and it will help spool up by around 500 RPM. Very much worth it even if you're just keeping it at stock 15 PSI (which is what I recommend).
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Old 08-04-2003, 09:33 PM   #7
JayB
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Chapter/Region: NESIC
Location: Templeton, MA
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12 mazdaspeed3
white

Default

Will this help with low factory boost in the first few gears? I don't have a boost gauge in my car, but I read somewhere that the car will limit boost in the first few gears (ie. not give you the full boost in first and second)

I feel this on my car...as it seems to accelerate faster in 3rd or 4th..than in 1st or 2nd.

I can only assume what I feel is the car limiting the boost.

Am I crazy, or is does the STI really do this?

Maybe a MBC will help.??

Thanks

JayB
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Old 08-06-2003, 01:16 AM   #8
yoshar
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2004 Subaru wrx sti
blue with gold rims

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does the MBC void the warranty?
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Old 08-06-2003, 01:50 AM   #9
rlavalle
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Java Black Pearl

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Yes.

Then again, as long as you keep the hoses intact, you can restore it to stock.

Russ
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Old 08-06-2003, 11:36 AM   #10
Supra 98
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Location: Framingham
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2004 STi
NESIC TrackH0z # 28

Default

Anyone have some pics of the installation of one of these on an STi? Man we need the STi UTEC now...

Scott
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Old 08-06-2003, 12:07 PM   #11
rexxer
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Join Date: Oct 2002
Chapter/Region: W. Canada
Location: "Somewhere cheap... Red Deer"
Vehicle:
2014 WRX
White

Default

The boost in 1st and 2nd gear is dependent upon the environmental conditions and the load on the engine. There is less load on the engine in 1st and 2nd which is why some people get less boost in these gears. People reported low boost in 1st and 2nd on the WRX... but my stock 02 could get full boost in all 5 gears.

A person with the screen name GOD (on this forum and another) did a lot of work on the STi with boost control and was able to get very good results.
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Old 08-06-2003, 01:01 PM   #12
rlavalle
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Join Date: May 2002
Location: Seattle 'burb (Kirkland)
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2004 STi: 580 AWHP
Java Black Pearl

Default

I just got an email from Phil at TurboXS...

He says the STi UTEC is about 6 months out.

Russ
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