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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 07-29-2013, 08:34 PM   #1
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Wastegate 38mm or 44mm?

need to put an external wastegate but I do not know what to put between 38mm and 44mm. I have always had a wastegate actuator. what is the difference between the two? what wastegate you advise? I have a sr20det to 15 lbs of boost with a turbo GT2871R. with the external wastegate I'll get a 20psi.
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Old 07-29-2013, 11:03 PM   #2
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38mm will be fine for what you need it for
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Old 07-30-2013, 07:06 AM   #3
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Larger wastegate will help with boot creep but considering turbo size, I agree 38mm will do fine. This will all come down to preference.

Personally, I like larger wastegates.
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Old 07-31-2013, 02:18 AM   #4
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well, larger wastegates take space and cost money. if you can do your job with a smaller one, do it. generally, you need a big wastegate when you wanna run low boost on a big cc engine. the more boost you run, the less open the wastegate is, so...

the really good thing about an external (when its got a screamer pipe) besides the sound, is that it effectively makes your exhaust bigger ...just by a bit.
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