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Old 07-15-2003, 10:16 AM   #1
QfactorRS
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Default how to control boost?

hey guys

what should i use for boost control?

i guess i could upgrade my wastegate spring, but replacement springs are tough to find, i have been searching for a dealer and they keep asking for almost $30 for a spring shipped.

Then there is the boost controllers, both electronic and manual.

I just plain don't know what to get. All the alternatives are more or less risky. If i had unlimited budget i'd go with a top of the line ebc with a wastegate spring as a safety.

Could i throw a low psi wastegate spring, so that is the ebc fails the boost will be limited by the spring? when an ebc power is off, is the solenoid closed or open?

my common sense is getting really challenged by this boost/fuel stuff!!

Q
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Old 07-15-2003, 11:38 AM   #2
kastle
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Let me ask this... Do you have upgraded internals?
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Old 07-15-2003, 11:45 AM   #3
QfactorRS
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no, i am running the stock EJ22T with RS heads.

i would like to run about 8psi on some occasions and be able to adjust it to about 10psi for Auto-X or track days. right now i am still running 5 psi with a tial wastegate spring.

Q
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Old 07-15-2003, 12:57 PM   #4
Puckaveli
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You might want to measure your IC efficiency. If you turn up the boost you will most likely increase intake temps. If your Ic isn't cooler your intake very well then you might want to remedy that before you start pumping more and hotter air in the cylinders. Another thing is be sure your A/F ratio is not closer to lean already and have a way to alter your A/F in case is starts getting leaner when you increase boost.

I would say the easiest and most inexpensive way would be a manual boost controller.
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Old 07-15-2003, 01:30 PM   #5
QfactorRS
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i am going with a slitghtly modified to fit Blitz front mount WRX kit.
that should bring plenty of cold air.

Fuel setup should be/was told, by member with similar setup, work up to 10psi. If i see i am running lean under higher boost, i'll swap the injectors and get a link.

I was eye balling the TurboXS dual stage MBC, it is pretty much what i want, the key is to take plenty of time to set it up gradually without going above 10 psi. i know it sounds pretty ghetto, but it worked on an S4.

any feedback is more than welcome as usual.

Q
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Old 07-15-2003, 05:36 PM   #6
wac
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Default Re: how to control boost?

Quote:
Could i throw a low psi wastegate spring, so that is the ebc fails the boost will be limited by the spring? when an ebc power is off, is the solenoid closed or open?
That's how most EBC's operate.

Don't waste your time on an MBC or playing with wastegate springs. Even the cheapest Blitz Dual SBC Type S is vastly easier to tune than an MBC. I've had very good experience with this $300 EBC. I've verified that it works from 3.5 psi (or whatever your wastegate spring is) to at least 14 psi, which is perfect for "low-boost" aftermarket turbos.
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Old 07-15-2003, 05:46 PM   #7
8Complex

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What type of wastegate do you have? If it's an external, you should be able to get a spring for $10-15 without much searching. If it's an internal, $30 is about right, IIRC.
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Old 07-15-2003, 10:24 PM   #8
Mancini
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Any thoughts on ball and spring MBC's? My friend is using one on his DSM. Made it for ~10 bucks and he easily controls his boost from stock 8psi to 15psi. I was thinking about making one to turn it up to 5psi from my 4psi that I have now. Baby steps
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Old 07-15-2003, 11:04 PM   #9
QfactorRS
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tial 35mm external wastegate.

Where can i find a different spring for it?

thanks guys

Q
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Old 07-16-2003, 02:05 AM   #10
Midwayman
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What do you have for fuel management?
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Old 07-16-2003, 09:20 AM   #11
QfactorRS
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stock ECU
Adjustable FPR
Adjustable RRFPR
Walbro pump
parallel fuel rails mod.
stock injectors

semi-controlled knock using a J&S safeguard.

Q
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Old 07-16-2003, 09:22 AM   #12
QfactorRS
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i did some research on the ebc's out there, and it seems that the blitz sbc ID is on top of the charts for reliability and functionality.

anyone with experience with one of those in low boost applications?

Q
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