External Wastegate on a 9-3. - The Saab Link Forums

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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 08-18-2008, 11:48 AM   #1
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External Wastegate on a 9-3.

I will be keeping track of what I do to my car in this thread for anyone who cares...

This showed up today:








I found someone local who can weld cast iron, and the price should be sort of reasonable. I plan to vent to the atmosphere. If anyone has ideas or input that would be appreciated.

So to get started, I need a 9-3 manifold.

Anyone?
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Old 08-18-2008, 11:48 AM   #2
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EWG FTW.

Your car will sound insane.
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Old 08-18-2008, 11:51 AM   #3
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Sounds like a fun project! Probly be a bit easier to control boost with that vs the internal one, no?

How about having BF weld up an ewg manifold
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Old 08-18-2008, 11:51 AM   #4
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andy, chuck @ BF has my 9-5 manifold. they're the same thing. go get it if you want
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Old 08-18-2008, 11:52 AM   #5
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andy, chuck @ BF has my 9-5 manifold. they're the same thing. go get it if you want
We can go get MY FUCKING MOTOR at the same time maybe?
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Old 08-18-2008, 11:54 AM   #6
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We can go get MY FUCKING MOTOR at the same time maybe?
Yes. Please.
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Old 08-18-2008, 11:55 AM   #7
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We can go get MY FUCKING MOTOR at the same time maybe?
...or a bunch of people's $540 back?
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Old 08-18-2008, 11:56 AM   #8
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I'll be town this weekend.

Aero & I can rough up Chuck if need be.
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Old 08-18-2008, 11:56 AM   #9
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Yay, I get to go see fuckface.


Anyway, I need to figure out what spring is in here, and then maybe get a new one.

I'm shooting for a peak of 28 or so on the new tune (eventually). What should my base be set at?

There is a 14 pound spring available. Base at half of peak, right?
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Old 08-18-2008, 11:58 AM   #10
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base should be 1/3 to 1/2 of projected peak. i.e. 9lbs to 14lbs of base boost.
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Old 08-18-2008, 12:04 PM   #11
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Yay, I get to go see fuckface.


Anyway, I need to figure out what spring is in here, and then maybe get a new one.

I'm shooting for a peak of 28 or so on the new tune (eventually). What should my base be set at?

There is a 14 pound spring available. Base at half of peak, right?
For an external wastegate the rule of thumb is, your max boost should be no more than 7 psi more than the spring that you run or else you may experience boost creep.

I currently experience that issue in my c900 with a 8psi spring and 17psi max boost. You should probably pick up a 1bar spring.
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Old 08-18-2008, 12:28 PM   #12
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Alright, good info.


I am going to take it apart tonight and see what's in it.

I am hoping for a bit better boost control with this.

Also, if anyone has any thoughts on how to bypass/hold closed the stock one, let me know.
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Old 08-18-2008, 12:32 PM   #13
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What flange does the turbo use? Can you eliminate the internal WG assembly and use a blockoff plate?
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Old 08-18-2008, 12:34 PM   #14
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I do not know.


It's the stock GT30 one, if that helps.
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Old 08-18-2008, 12:35 PM   #15
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Are you going to have this for Amery?
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Old 08-18-2008, 12:36 PM   #16
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I wish!


This will be done in a month or so I think.
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Old 08-18-2008, 12:36 PM   #17
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For an external wastegate the rule of thumb is, your max boost should be no more than 7 psi more than the spring that you run or else you may experience boost creep.

I currently experience that issue in my c900 with a 8psi spring and 17psi max boost. You should probably pick up a 1bar spring.

Rule of wrist?
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Old 08-18-2008, 12:44 PM   #18
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I do not know.


It's the stock GT30 one, if that helps.
Take pictures. GT30s can be had in several different variations with different flanges. 4 bolt, 5 bolt, etc.

Where was it sourced from at least?
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Old 08-18-2008, 12:51 PM   #19
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This one:
http://www.turbobygarrett.com/turbob...R_700382_3.htm

2.75 inlet.

Looks like the one at the bottom. 5 bolt flange.
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Old 08-18-2008, 12:55 PM   #20
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Oh! So it has the flapper built into the housing?

Then weld the door shut. But take pics once its out to give us a better idea.
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