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Originally Posted by 82-300td
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. 
If you can live with 11psi, good for you. I'll keep my KKK turbo and 13psi.  |
Umm you got that backwards...the KKK starts building boost at a lower RPM but peters out early...the Garrett will easily do enough to damage the motor.
I am running 14 PSI boost on my W116 right now with a garrett T-3....and and experimenting eith turning up the full load stop to get egt's up to max under full load to get most power.
And by the way....10 psi or 14 psi..you will make the same power without the IP being adjusted to increase fuel output. Don't sweat 11 psi unless you are doing other mods.