Quote:
Originally Posted by SHIFT_*grind*
It makes perfect sense, because if you have a 15 psi wastegate spring, you cannot boost less than 15 psi.
All a boost controller or boost solenoid does is create a controlled leak so that the wastegate thinks the manifold is seeing less pressure than it actually is.
Stock wastegate actuator is 7 pounds. The factory solenoid creates a controlled leak between the manifold and the actuator so that when the manifold sees 10-11 pounds (pretty certain it's 11), the actuator sees 7 and opens up.
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Also this controlled leak is not lost to atmosphere it is simply re-routed back to the intake trake between turbo and MAF like it should be since it has been accounted for already by the MAF sensor.