Quote:
Originally Posted by shiv@vishnu
This means that for a fraction of a second, the boost pressure in the intercooler tube (where boost is measured) is 1-2psi higher than it is in the intake manifold (what is actually seen by the engine).
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That's what we were thinking...although the 20psi that some gauges are reading is really strange.
Quote:
Originally Posted by CanadianTSi
Your boost gauge should be Installed to read boost at the Intake Manifold ie. exactly what the Engine is actually seeing.
Are you guys that are seeing the spike measuring boost at the IM?
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No. Everyone is measuring boost in the intercooler tube. Unless someone has drilled and tapped the intake manifold itself, everyone's boost gauges are attached to the vacuum lines coming off the diverter valves
which is between the intercooler and the throttle plate. This is
not measuring the boost inside the intake manifold itself, but the pressure ahead of the throttle plate. It's not the same thing.
If you don't buy this explanation, just review the diagram in the BMW documentation.