Not that I am a rotax expert, but from my car tuning and racing experience,
I would suggest
that either your pump/s are not able to keep up with demand from the carbs
(unlikely, given
you are running two), you have and open return line??? (you did put the
restrictor in the return line
AFTER the carbs), or your carbs are WAY WAY TOO lean and you simply don't
have enough fuel entering
the engine to keep it running at full throttle. This is the most likely
situation IMHO assuming you have
the restrictor installed. An excessively lean mix could also account for the
lack of MP at full throttle.
No fuel to burn means no expanding gasses so no pressure to drive the
impeller side of the turbo, so less
boost than expected so a lower MP than expected.
You can get some good automotive lean/rich gauges for around $100 these day,
if you lift the needles in your carbs
a bit and it runs better, I would suggest you invest in one to get your mix
right. Failing that, you mentioned contaminated
fuel filter, have you checked to see if the fuel is leaving the tank freely,
by dropping the fuel line off the carb
and see how much fuel comes out when the pumps are on.
hope this helps
craig
kit 577
vh-xsv
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