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


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Old 04-10-2008, 09:40 AM   #81
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Default Re: The EWG FAQ (External Wastegate)

The EWG springs are rated @ a boost pressure typically (e.g. 10PSI spring, 14psi spring, etc). You will not be able to run less boost than the EWG spring rating. Pick an EWG spring rate as close to the minimum boost pressure you run as you can. In theory, this minimizes your spoolup times by holding the wastegate shut until the boost target is reached better than a lower rated spring would.

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Is there any formula for figuring out which size spring to use with a particular application or boost level?
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Old 04-10-2008, 01:34 PM   #82
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The EWG springs are rated @ a boost pressure typically (e.g. 10PSI spring, 14psi spring, etc). You will not be able to run less boost than the EWG spring rating. Pick an EWG spring rate as close to the minimum boost pressure you run as you can. In theory, this minimizes your spoolup times by holding the wastegate shut until the boost target is reached better than a lower rated spring would.
OK that helps a little. I have a yellow (10psi) spring in my Tial and was just curious if this would be sufficient when boosting at 22-25psi. Thanks for the help.
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Old 04-10-2008, 04:01 PM   #83
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Default Re: The EWG FAQ (External Wastegate)

Anyone able to fit an EWG with the APS TBE? I've been looking down the DP and it looks like there is very little room due to the large flanges.
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Old 05-09-2008, 08:54 AM   #84
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Default Re: The EWG FAQ (External Wastegate)

suscribed
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Old 05-29-2008, 11:11 AM   #85
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Default Re: The EWG FAQ (External Wastegate)

How much value is retained by going EWG but plumbing the dump tube back into a catted downpipe? Is it still worth it? Is it better to plumb it in after the cat?
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Old 05-29-2008, 08:05 PM   #86
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Default Re: The EWG FAQ (External Wastegate)

I really like the idea of an EWG with a catted DP, plumbed back in post-cat. You get the clear conscience of a catted exhaust 90% of the time, with some catless flow advantages just when you need it. Seems like a good match to me... Haven't seen any cars set up that way but it appears possible, if there's enough room. Depending how the UP & EWG are done, it can get kinda tight in there.
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Old 05-29-2008, 09:26 PM   #87
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Default Re: The EWG FAQ (External Wastegate)

BayAreaRacing.org GTO vs STi - Video

Seans car. Just though I do add a video on the thread. UR 38mm kit, Stock turbo and HKS carbon TI
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Old 05-30-2008, 04:41 AM   #88
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Default Re: The EWG FAQ (External Wastegate)

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BayAreaRacing.org GTO vs STi - Video

Seans car. Just though I do add a video on the thread. UR 38mm kit, Stock turbo and HKS carbon TI
The title is a little misleading, I thought the GTO was going to be trying
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Old 05-30-2008, 04:51 AM   #89
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Default Re: The EWG FAQ (External Wastegate)

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The title is a little misleading, I thought the GTO was going to be trying
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Old 05-30-2008, 04:59 AM   #90
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Default Re: The EWG FAQ (External Wastegate)

Well, after actually viewing the video, it looked like the GTO was racing. I have no idea why it got walked on so bad. Well, it did sound like the STi got the punch on him. Still, that STi sounded pretty nice.
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