He is going to have to use a modest amount of boost indeed with

high

compression rotors. Looks like extensive porting of the waste gate
is
called
for and a new rear cover for the turbo with a straight shot waste
gate
pipe.

Paul Lamar

I like this idea of waste gate pipe.
Bulent

I think you can accomplish the same effect by restricting the

exhaust,

the intake upstream of the compressor, or both.  The easiest would be
to restrict the intake.

Hans Conser

The problem with that Hans is fixed restriction will not allow
generating
the boost at high altitudes where he will need it.

Paul Lamar

If this really is a problem then make it variable, a throttle body

that

is upstream of the compressor.

Hans Conser

How would that differ from a throttle body downstream of the compressor?
I think that must be what he has now. Perhaps he is opening the throttle
wide now on takeoff and that is when he gets too much boost. Perhaps
someone
should tell him not to open the throttle all the way :)

Paul Lamar

The difference is that it is easier on the turbo, you don't have the
pressure backing up on the compressor.  I believe that this would be
the only throttle body you would need.

Hans

Not sure about this Hans,
The airflow through the compressor/engine and thus the boost would be the
same either way. With a TB after the compressor you have a BOV to relieve
the pressure when changing from full throttle to idle. If the TB is before
the compressor, the stress on it would be roughly the same but you would
need a vacuum release valve instead between the TB and compressor. Since the
engine wants to create vacuum when slowing, you might have a slow/delayed
throttle response this way.

Ron Freier

 
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