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Dual Stage Boost Control |
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| The use of a MBC along with an upgraded ECU has been
discussed many times and the general consensus is that the ECU should be
in control of boost pressure. I have done my own testing and research and
I have also reached the conclusion that it is safer to allow the ECU to
mange boost pressure and top end performance is better. However there are
still situations when a MBC is preferred. The benefits of the MBC are
quicker spool up and greater low-end torque. The purpose of this device is to switch between ECU and MBC boost control while driving. It is a very simple device and the picture and diagram speak for themselves. Transition between both is smooth and quick. An example is a wide open throttle accelerations, ECU control has max boost at 17 psi. The button is pushed to close the solenoid and the MBC takes over. Boost quickly rises to 20 psi and there is a noticeable power increase. I have tested multiple setups and I have discovered that this one is the best. |
 
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| The red button is a single push switch. The red
LED on the gauge cluster indicates that the solenoid is open. Both were
acquired at radio shack. The solenoid valve is the Evap Purge Valve. My
original valve was misdiagnosed by the ECU as being faulty so a new valve
was purchased, leaving me with two working valves. There are many
solenoids that will work in this situation. One option is the Power Aire
solenoid for $27. ~ Power Aire ~
Button location is very critical to this system. It must be in an easily and quickly accessible location. The perfect spot for the button is inline with the gearshift knob. In 1st, 3rd and 5th the button can be reached without taking your hand off the gearshift. The total cost for a dual stage boost control is very cheap. Costs should be below $50. |
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