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Originally Posted by Phil
I connected a test guage on the line from the intake manifold to the alda then drove the car. I was getting 8psi boost. I then adjusted the waste gate but could only bring the pressure up to 11psi. In all my searching it looks like I should be able to get much higher pressure. I was hoping to raise it to the 13-15 range. Does anyone have any idea why I can't get more pressure.
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The Garrett will only make 11psi without modification. The KKK turbo on the other hand will be at 20+psi before you know it, if adjusted incorrectly.
After recently tearing apart my Garrett this week I found a few things. The wastegate diaphram won't go above 11psi because it is bottomed out on it's threads (On the valve). The only stock way to go above 11psi (With pyrometer or intercooler) is to cut more threads on the valve. This will allow more spring tension and more boost. The other way is to use an external
Boost Controller to the wastegate hose. I think this is cheating the easy way out, plus it looks goofy.
I also found the valve stem seal to be VERY loose and allowing soot to enter under the diaphram.
If you can live with 11psi, good for you. I'll keep my KKK turbo and 13psi.
