2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

S4 wastegate is bad

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Old Apr 26, 2007 | 06:26 PM
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pyscho7's Avatar
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From: irmo, sc
S4 wastegate is bad

i have been looking around when i get the chance but dont see a whole lot of options as far as replacing the wastegate on the stock s4 turbo. i would like to upgrade turbos and everything but dont have the money quite yet to do everything i'd like. what would ya'll recommend for the s4 turbo wastegate?
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Old Apr 26, 2007 | 06:50 PM
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FCKing1995's Avatar
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Only 2 options you have is to port the stock wastegate or buy a used S5 turbo.
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Old Apr 26, 2007 | 08:03 PM
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HAILERS
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http://www.aaroncake.net/rx-7/s4wastegate.htm
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Old Apr 27, 2007 | 02:23 AM
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Originally Posted by pyscho7
i have been looking around when i get the chance but dont see a whole lot of options as far as replacing the wastegate on the stock s4 turbo.
Well you can't replace an integral wastegate because it's... integral. But you can easily improve it's performance by making it bigger.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/serious-s4-wastegate-porting%85-343788/ (scroll down to post #15 for reposted pics)
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