![]() ![]() A boost controller will allow you to direct some of that pressure to the top of the wastegate diaphragm creating two opposable forces. The pressure in the vacuum line going to the compressor reference port will equal the pressure the turbo is producing. Less airflow means less pressure will be assisting the spring to keep the wastegate plunger shut. #Wastegate without boost reference manual#The manual boost controller works using a spring and check ball, by screwing the adjusting screw into the boost controller you put more pressure on the spring which reduces the amount of airflow through the boost controller and into the boost controller port. In order to run a manual boost controller we need to tee off of the vacuum line which runs from the turbo compressor housing to the compressor reference port. This can be corrected by using a boost controller. This "pre-opening" leaks boost pressure through the dump tube before max boost pressure is reached resulting in a decrease in power mostly toward the top end. Why? Although the spring fully opens at its set spring pressure it tends to begin opening before reaching the set spring pressure. Typically, if you use the wastegate to control your boost levels you will experience a decrease in power and spool times. ![]() When the pressure from the spooling turbo exceeds the spring pressure the wastegate's plunger opens releasing the excess pressure through the dump tube into the exhaust after the turbo or to open atmosphere. Normally pressure from a spooling turbo pushes against the diaphragm (though the vacuum line attached to the compressor reference port) which in turn pushes against the wastegate spring. In order for the wastegate to work you must have the compressor reference port hooked up to the compressor side of the turbo, if you don't have this vacuum line attached than the boost pressure will not be limited to the set spring pressure it will build unlimited boost pressure until your engine is destroyed. This would mean that in order to open the wastegate you would need to excerpt a greater pressure than the 14.7psi spring holding the wastegate closed. Spring rates vary depending on the amount of boost you want to run, typically they are given in a "bar" value for example 1 bar would be 14.7psi. Inside the wastegate is a diaphragm which creates a seal, and a spring which holds the wastegate closed. Once again all questions and input are welcome. Mike (bigrpower) let me take a couple pics of his set up with the precision wastegate, thanks Mike! This will also be followed with some installation pics both current and old. This is here for all to see, read and to give informative info. ![]()
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