Previously an air flow test was performed to measure the difference caused by the grate in the bottom of the stock airbox.
That test utilized the stock air filter and stock accordion hose with a direct attachment to the flow bench.
A request was made to repeat the test utilizing an aftermarket air filter and MST intake hose and turbo inlet elbow to assess how the grate affected airflow through these components.
A stock air box is fitted with an aFe dry flow air filter and the MST Performance inlet hose and turbo inlet pipe. This air intake is attached to the flow bench by an adapter that simulates the IS20/IS38 turbo compressor housing inlet.
Note: Addition of the TIP and use of the compressor simulating adapter is a significant change from the previous test where the inlet hose was attached directly to the flow bench.
Once attached to the flow bench the airflow through the intake with the grate installed, and with the grate removed, is measured. The test is conducted at a depression of 28″ of H2O.
Measurements made with the grate installed and removed are shown on the following chart:
Consistent with previous test results the air flow through the intake for both test cases is significantly reduced with the addition of the turbo inlet elbow and compressor sized adapter.
Removal of the airbox grate produces a small increase in airflow through the intake from 373 to 379 CFM.