I am a bit confused about the computer operating the waste gate.  We used
a TO4 turbo on a Bonnevile liner in 1971 and the waste gate was operated
by manifold pressure.  We would set the spring for 7 lbs boost and it
would go no higher.  When we did a speed run we used 15 lbs boost and it
stayed right there.  We ran both engines on the dyno with a single TO4
turbo.  The engines were stock Honda 750s with steel O rings in the head
and a lowered compression ratio.  At 15lbs boost (45 lbs absolute
manifold pressure) the stock 750 Honda produced 150hp.  The fuel was
straight methanol.

The point is the manifold pressure stayed right where we put it with the
waste gate control spring.

Bob Y

Now a days computer takes in data from a lot more sources than
just the manifold pressure. For example: the computer in your modern
car will not let you destroy the engine by running it flat
out for too long. It will shut the engine down or limit the HP
generated. The computer decides how far to open the throttle
on my RX8. My foot might be flat on the floor but no matter.

Here is an OBD II  print out of what the engine was doing on an acceleration
run. The throttle was never more than 78% open even though my foot was flat
on the floor.

Paul Lamar ...No rotor no motor.

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