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Go Back   IWSTI.com: Subaru WRX STI Forums > IWSTI Engine & Drivetrain > 2.5 Liter/Litre Factory Motor


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Old 06-02-2008, 06:24 PM   #111
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Default Re: The EWG FAQ (External Wastegate)

What EWG kit will fit my Stromung DP (with seperate wg pipe)?
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Old 06-11-2008, 09:52 PM   #112
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Default Re: The EWG FAQ (External Wastegate)

im not completely understanding the wastegate spring question....what spring would i want to get for say 20 psi?
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Old 06-12-2008, 12:41 PM   #113
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Default Re: The EWG FAQ (External Wastegate)

Quote:
Originally Posted by 1loudsti View Post
im not completely understanding the wastegate spring question....what spring would i want to get for say 20 psi?
I run about 19.5 on 91, 23.5 on race gas......

I use 14lb spring.....which is what you will want.
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Old 06-12-2008, 04:07 PM   #114
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Default Re: The EWG FAQ (External Wastegate)

As far as I know, the wastegate will open at whatever your spring pressure is at. So if the spring pressure is 14lb, your wastegate will open at 14psi.
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Old 06-12-2008, 04:10 PM   #115
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Default Re: The EWG FAQ (External Wastegate)

the ECU controls the wastegate just like the stock internal wastegate doesnt it? i was told the usual spring is a .9 bar spring which is what I have and what my tuner told me to get. I plan on running about 19 psi.
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Old 06-12-2008, 04:18 PM   #116
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Default Re: The EWG FAQ (External Wastegate)

No, the ECU doesn't operate the EWG, it is controlled by pressure. That is why the spring is important b/c if you get a very stiff spring and don't boost that high, the EWG won't open.
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Old 06-12-2008, 04:27 PM   #117
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Default Re: The EWG FAQ (External Wastegate)

so clearly the stock internal wastegate is controlled by the ecu. it doesnt just open at a certain boost level. So how would the EWG hold the boost? say i install the .9bar spring in my car. If i run spring pressure i'll see 13 psi correct? but if i want to run 19 psi, how would that work?

I guess the better question is what good is the prodrive boost solenoid if the wastegate simply opens at 13 psi?
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Old 06-12-2008, 04:30 PM   #118
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Default Re: The EWG FAQ (External Wastegate)

I beleive the solenoid controls the ewg, because you have to run a hose from the top of it to the solenoid.

Anybody know what spring I should run? Got the P&L kit and it came with the one bar spring. Currently running 23lbs on pump 25 on racegas.
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Old 06-12-2008, 04:35 PM   #119
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Default Re: The EWG FAQ (External Wastegate)

im kinda convused as well cuz i thought the boost solenoid goes to the wastegate. And if the wastegate is controlled by the solenoid, why does the spring even matter? maybe a ewg expert will chime in
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Old 06-12-2008, 04:57 PM   #120
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Default Re: The EWG FAQ (External Wastegate)

Quote:
Originally Posted by BillFromTR View Post
I beleive the solenoid controls the ewg, because you have to run a hose from the top of it to the solenoid.

Anybody know what spring I should run? Got the P&L kit and it came with the one bar spring. Currently running 23lbs on pump 25 on racegas.
I'm under the impression that you want as close to your max boost as possible, otherwise the EWG will be open at lower rpm's creating lag, and it will be insanely noisy. Am I correct?
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