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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 06-12-2008, 06:25 PM   #121
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Default Re: The EWG FAQ (External Wastegate)

the reason for the lower pressure spring (from my new found understanding) is that if something fails you wont run no wastegate, basically it will default to 14 psi

a boost controller will simply regulate the amount of pressure the wastegate sees preventing premature opening

i may be wrong someone correct me if i am
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Old 06-12-2008, 06:44 PM   #122
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Default Re: The EWG FAQ (External Wastegate)

Actually you are right i believe. That was how my other ride was set up, just in case my boost controller failed, the wastegate still works. If they both fail, you have infiniboost!!!
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Old 06-13-2008, 07:52 AM   #123
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Default Re: The EWG FAQ (External Wastegate)

The prodrive boost solenoid gives better spool, enables alittle more peak boost to be run, but primarily it's the faster spool . The Tial EWG springs can also be doubled up. Meaning, take the 1 bar spring which is the largest spring, and you can add a smaller spring inside of it to increase the rate. There are only 4 springs and they are colored. Red, green, blue and yellow which designates the rate. There's a vendor on ebay that sells just the springs. They are pricey($29) and nobody else I found carries the springs in stock. I was gonna double up My 1 bar spring plus the smallest spring when I switch to bigger turbo. But decided 14psi would be fine. The larger the spring rate, the harder the hit is when the EWG opens. So, if you road race alot or autoX with a moderated sized turbo, the smaller spring shouldn't send the back end of car around when it opens. Some guys have removed their ewg setup because of the abruptness of the opening. Could of just dropped to a smaller spring. Doing so reduces spool time some. A trade off.
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Old 06-13-2008, 10:47 AM   #124
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Default Re: The EWG FAQ (External Wastegate)

maybe you guys can answer this.....if i was to put an mbc in does it go before, after or in place of the stock one?
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Old 06-26-2008, 09:04 PM   #125
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Default Re: The EWG FAQ (External Wastegate)

I don't know if this was posted or not cause I didn't want to read through all the pages but on GCG it says you would need to relocate your turbo in order to have a EWG. Is that correct with our stock VF39 or do we not need to relocate?
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Old 06-26-2008, 09:08 PM   #126
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Default Re: The EWG FAQ (External Wastegate)

You dont have to relocate your turbo, just buy an uppipe with an intergrated external wastegate.
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Old 06-26-2008, 09:08 PM   #127
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Default Re: The EWG FAQ (External Wastegate)

Incorrect. Whoops, before Bill.
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Old 06-26-2008, 09:13 PM   #128
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Default Re: The EWG FAQ (External Wastegate)

I have a question not sure if its been answered... I want to buy an EWG for my stock turbo, but i was wondering what size 38mm or 44mm, because soon ill be switching to a bigger turbo most likely in the stock location... But i dont want to buy a new EWG for this, so which is the best to get.. Thanks a lot
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Old 06-26-2008, 09:15 PM   #129
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Default Re: The EWG FAQ (External Wastegate)

Quote:
Originally Posted by BillFromTR View Post
You dont have to relocate your turbo, just buy an uppipe with an intergrated external wastegate.
Quote:
Originally Posted by neverendingmods View Post
Incorrect. Whoops, before Bill.
Thanks for the quick responses guys. Thats what I like to hear tho, don't want to move too much **** around. Not ganna be able to do all my mods tho till after college but would this actually be beneficial with a factory turbo, ap v2, and TBE? Once again sorry if these were already answered.
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Old 06-26-2008, 09:19 PM   #130
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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 can get 23 psi at 70% wgdc on a 10 psi spring. a good solenoid helps a lot!
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