layback40 wrote:
A boost gauge should measure the boost output of the turbo. as such it needs to be on the air outlet of the turbo. Often there is an air line from the outlet side to the wastegate actuator. this will tell you the boost pressure. If you connect on the inlet manifold you are measuring the charge pressure. Many do this. it will give a lower pressure as the air has been forced through the intercooler etc. Its important when quoting pressures to make sure you state boost or charge pressure. WWDiesel is showing the location for a charge pressure gauge.
This engine/turbo setup has no wastegate being it is a variable vane turbo. Therefore no location to use as you described!
The location I chose on the intake manifold is reading the exact SAME pressure that the MAP sensor is measuring and providing that information to the ECM which is controlling boost pressure via the variable vanes.
There is no location on the turbo discharge to safely tap into to read discharge pressure other than putting a hole in the boost hose using the Sasquatch port kit or making your own out of metal like Flash did.
There should be very little dp across the CAC if it is clean.
Static pressure from the turbo discharge all the way to the intake valves should be fairly constant at a given vane position provided there are no leaks in the system....
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