This is a FrankenTurbo F21 turbocharger turbine housing for the Audi 1.8T engine minus the turbine wheel.
Below are the airflow test results compared against BorgWarner B5 S4/RS4 K03 and K04 turbochargers with turbine wheel installed.
Today I attached an adapter inline of the compressor signal lines that feed into the N75 valve. The adapter has a fitting for a line that will allow me to record on the Innovate LMA-3 AuxBox the boost pressure in the compressor housings.
This will give me an idea of the compressor outlet pressure, rather than just manifold pressure, which is lowered by the pressure losses between the turbo outlet and throttle body, primarily by the intercoolers.
By popular request, BorgWarner K04 turbine housing attached to the stock and AWE exhaust manifold on the flowbench.
This is a follow-on to the exhaust manifold flow test of the AWE tubular manifolds and stock manifolds.
Results, along with results of just the K04 turbine housing without any exhaust manifold.
Not too surprising, but not much to take away from this chart either, other than the fact that the turbine housing is a significant flow restriction, which makes sense given what the part does.