Scott Speirer wrote:

A couple of mongths ago I got the 2001 Turbonetics catalogue.  They sell a Variable
Boost Control regulator.    The description for it reads,

"Change your boost level from the cockpit of your car with the TURBONETICS "VBC"
kit.  The "VBC" kit can adjust boost pressure on any Deltagate, Racegate or factory
dual port actuator.  Adustable from stock to the indicated pressure above stock."

Three versions of the unit are sold: 0-10 PSI, 0-25 PSI and 0-50PSI.  Don't know how
much they cost.  I plan on calling them up this week and find out.

I was going to write that this unit may just be installed in-line between the intake
manifold and actuator along the pressure line, and used to "fool" the actuator
diaphram to think the manifold pressure is lower than it acutally is, thus allowing
the waste gate to stay closed up to a higher boost pressure before opening.  But, the
description says it's for two port actuators.  I can't recall for sure, but I think
the Mazda stock actuator is a single port.  Maybe dual port actuators are two port
specifically designed for the purpose of such a device as the VBC.

On the same page with VBC are actuators.  The dual port actuator shows 2 pressure
fittings, and the single port actuator shows 3 pressure fittings.  Doesn't make
sense.  Maybe they have the pictures reversed.

 
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