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Jim Sower <canarder@frontiernet.net> wrote:
I would have a manual internal waste gate. The waste gate would
be normally open (dumping all exhaust past the turbo). On
takeoff, I would run WOT (say 29"), no boost. I could close the
waste gate a little and get 33" for example for a hot day or
short field. As I climb out at WOT, I gradually close the waste
gate to maintain 30" MAP. ...<snip>...<<< I have outlined essentially this same system here several times during the last few years, as it is the simplest and probably the least complicated way (read less plumbing and parts) to get the job done. My intention is to setup the throttle lever so 50% travel gives me WOT at the throttle body. As I further advance the throttle lever the wastegate begins to close and brings the turbo online. With the throttle lever wide open the wastegate will be fully closed. The popoff on the intake manifold is referenced to MAP and not boost, and set to blow off at my intended 34" MAP redline... this way the overboost protection is unaffected by ambient pressure. Just thought I'd share this once again as it's a hot topic revisited.
<marv>
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