Wastegate? - Subaru WRX Forum
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#1 Old 01-25-2014, 03:30 PM
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Wastegate?

Is a 40mm external wastegate to big for a vf39

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#2 Old 01-25-2014, 03:59 PM
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No. A 38 would probably be more suited for it but, I don't think you would have any problems from a 40.
See what your tuner thinks.

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#3 Old 01-25-2014, 06:39 PM
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I agree with boo. I'd go with a 38 but don't see an issue with 40. Tuner knows best.
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#4 Old 01-25-2014, 07:53 PM
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Why in the hell do you wanna get a wastegate for a stock turbo? Just stick with the internal gate that the turbo comes with. less headaches that way...

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#5 Old 01-25-2014, 08:09 PM
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A lot of people go EWG on stock Turbo...

Especially VF52s'
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#6 Old 01-25-2014, 08:57 PM
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It came on the car I was told it had a 20g but it's really a vf39 I was just worried the wastegate was to big

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#7 Old 01-26-2014, 08:02 AM
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Taken from Wikipedia:

A wastegate is a valve that diverts exhaust gases away from the turbine wheel in a turbocharged engine system. Diversion of exhaust gases regulates the turbine speed, which in turn regulates the rotating speed of the compressor. The primary function of the wastegate is to regulate the maximum boost pressure in turbocharger systems, to protect the engine and the turbocharger. One advantage of installing a remote mount wastegate to a free-float (or non-WG) turbo includes allowance for a smaller A/R turbine housing, resulting in less lag time before the turbo begins to spool and create boost.

External wastegates are commonly used for regulating boost levels more precisely than internal wastegates in high power applications, where high boost levels can be achieved.

Wastegate sizing is inversely proportional to the desired level of boost and is somewhat independent of the size or power of the engine. One vendor's guide for wastegate sizing is as follows:

big turbo/low boost = bigger wastegate
big turbo/high boost = smaller wastegate
small turbo/low boost = bigger wastegate
small turbo/high boost = smaller wastegate

However, exhaust flow is an effect of power. So, another decision chart could look like this:

big turbo/small engine/small power = small wastegate
big turbo/big engine/ small power = medium wastegate
big turbo/small engine/big power = big wastegate
small turbo/small engine/small power = small wastegate
small turbo/big engine/any power level = big wastegate -->The reason for this is that the small turbine will easily try to overspin from excess exhaust gas volume

Given this information, you should be able to draw your own conclusion
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#8 Old 01-26-2014, 08:05 AM
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I'd suggest getting rid of that stuff and go with a aftermarket DP that fits the stock location and the VF39. If you wanna stay external then go with a 38mm, 40 is to big.
As for people going with and external wastegate on a stock turbo, it's pointless. Then again what do I know...

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#9 Old 01-26-2014, 08:33 AM
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EWG helps with Boost Creep
Also helps with getting out excess Exhaust Gases that can cause backpressure.
IWG have these problems most.

So honestly psinuse you don't know much about EWG benifits.
Im not saying an IWG will fail, but Ill pay the extra money to make sure my car runs the way it should.
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#10 Old 01-26-2014, 11:11 AM
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Quote:
Originally Posted by Sub14WRX View Post
EWG helps with Boost Creep
Also helps with getting out excess Exhaust Gases that can cause backpressure.
IWG have these problems most.

So honestly psinuse you don't know much about EWG benifits.
Im not saying an IWG will fail, but Ill pay the extra money to make sure my car runs the way it should.
Okay well since I'm obviously the dumbass here I guess I will just quietly stop posting then....

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#11 Old 01-26-2014, 01:08 PM
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It's seriously not needed though on a stock turbo. Get a 3 port BCS if you're that worried about spikes and creep. Hell, just don't get a Catless DP. Sorry if I offend anyone that is running one on a stock turbo...but it's really not needed. If you upgrade to a bigger turbo it really helps vs a stock turbo. Its something funky with the boxer engine that most of the IWGs aren't as good as a EWG. But, a stock turbo isn't that big to really require it. You can get by perfectly without it.
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#12 Old 01-26-2014, 02:51 PM
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Im offended Kirt

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#13 Old 01-26-2014, 03:57 PM
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Well, if it needed it. It would've came from the factory that way. Lol, but in all seriousness. It doesn't need it.

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#14 Old 01-27-2014, 08:10 AM
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Quote:
Originally Posted by Sub14WRX View Post
So honestly psinuse you don't know much about EWG benifits.
This is not acceptable conversation on a techincal forum. Ad Hominem attacks will not be tolerated. If you don't know what that means, click on the link (and punch your high school social studies teacher).

Warnings issued.
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#15 Old 01-27-2014, 09:34 AM
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I don't see how I attacked him but if you say so then I guess I did. Won't happen again.
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