It's highly probable the manifold graph referred to in fig 6, p76, is
referencing
the max MAP baseline which drops dramatically at engine startup.
The wastgate rests at full open position when the engine is not operating and/or
the wasgate switch on the instrument panel is switched off.
Turbo timing occurs at 46% throttle, with boosting available upward of 3000rpm.
Apart from Line Maintenance lubrication, unless you really have a total
understanding
of what you are doing I wouldn't recommend fiddling with any of the turbo
controlling components.
Unlike a Supercharger a Turbo can runaway and bust the engine in a split second.
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http://forums.matronics.com/viewtopic.php?p=511030#511030
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