It was kind of an accident the way it all came about. My turbo went out and I sent it to Garrett to have it fixed. They also replaced the wastegate control in the process and put a pressure operated one on instead of the vacuum operated (most wastegates are pressure operated). When I got it back and installed it, naturally it would not work right. I discovered what they had done and decided to try to go around the computer and hook it directly to the intake manifold. Worked great! I had previously disabled and then had to hook back up the EGR and knew that the computer would cut boost because it can tell the EGR has been disabled by the mass airflow meter at the air filter. Now there was nothing that could cut boost so I disabled the EGR again. You can replace the wastegate controller without removing the turbo. It is just tight.

The Dawes device is just an easy way to adjust boost pressure. You can do it by the wastegate controller but it is hard to get to and takes several runs to get it right. The Dawes device just goes inline between the turbo and the intake manifold. Simple. It also lets boost build strong up to the set point without any gradual bleedoff like the wastegate controller does. You just need to set the wastegate controller pretty much wide open. The Dawes device has instructions on this.

As far as emissions, if all they check is particulate; you could pass that with the EGR disabled. And you can disable it with a plate between the EGR and the manifold and they would never notice. Leave the vacuum hose on it.

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1995 S-350
370K + SOLD
1952 220B Cabriolet
39K kilometers + SOLD
1998 E300D
310K +
2012 E350 BlueTec
120K