Quote:
Originally Posted by scalbert
The issue I find with a leak is that I do not see how it would cause a spike. The wastegate actuators are vacuum operated and default to open. So the DME (or PROcede) has to try and keep them closed otherwise no boost is made. A leak in the vacuum lines shoulc cause the system to build boost more slowly or not at all. My boost builds very quickly; too quick I suppose.  |
In the idle phase the wastegates default to closed. At least that's what the documentation at the top of the Forced Induction forum says. Technically if the wastegates are closed then all exhaust gases go to the turbine of the turbocharger to build boost (makes sense - less turbo lag). The solenoids actuate the wastegates to open them to bleed exhaust gases and prevent overboost.