The wastegate of a turbo is operated when the manifold pressure acting on the diaphragm within the wastegate actuator overcomes the return spring allowing exhaust gas to bypass the turbine. With electronic boost control, the object is to use a solenoid to bleed off the manifold pressure signal seen by the waste gate unit so that it can see only a fraction of the manifold pressure. The solenoid operates at constant frequency and the duty cycle is altered to control the drop in pressure signal through the device.
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WARNING: Adjusting the boost levels for a turbo engine can alter its fuel requirements drastically. If the fuel requirements are not tuned simultaneously with changes in boost characteristics, engine damage could result. To avoid engine damage, watch your Air/Fuel ratios very carefully when increasing boost. Also check that your fuel system will be capable of delivering the required fuel for the increase in boost. |