First and foremost, this is not meant to offend the OP in any way. Just a quick bit of information in an attempt to combat a lot of misinformation about diesels.
Boost does NOT equal power. Boost pressure is a sign of restriction, not air flow. Especially in the case of a variable geometry design turbo, boost numbers should not be trusted as a measure of gaining horsepower. With an electrically controlled turbo system, the ECM is attempting to achieve a designated pressure value at all times. If you are outside of a threshold range of desired boost, the ECM will use gain values to open or close the turbo geometry to bring pressure back within range. Suffice it to say that whatever boost your truck is running, is EXACTLY what your ECM is commanding it to run (otherwise you would get a check engine light)
SOOO, to gain more boost, it will close the vanes. Less boost = open vanes. In programming we can command the VGT to provide 60psi of pressure. Does it make more power than when at 23psi of pressure? No way! All we are doing is restricting air flow to the point that cylinder pressures and temperatures are going to cause engine damage.
What do we know? There is a fine line of boost pressure optimization VS engine restriction. Over our many years of working with variable geometry turbos we have gained an extensive knowledge of what does and does not benefit power and longevity. Many still believe that more boost is better, but we are here to express the fact that quite often it is not the case.
As far as your questions about a device to raise boost pressure, yes we have no doubts it is achievable. BUT, we do not believe there would be substantial and reliable results.
Last edited by H&S Tech; 04-12-2013 at 06:05 AM.