A vendor developing an aftermarket intake manifold for the Mk7 sent me an early development version to record airflow compared with the stock MK7 intake manifold.
An adapter is made to attach the intake manifold to the flow bench. The adapter I made previously for the stock intake manifold will not work with this new intake manifold since the inlet is slightly larger than the stock intake manifold, and the adapter I made before was sized for use with the stock intake manifold.
The intake manifold is being tested using the flow bench, all airflow measurements are made at a test depression of 16″ of H2O. The flow bench is configured to exhaust airflow.
To check individual runners pieces of foam are inserted into the three runners that are not being tested.
Individual runner airflow measurements are shown on the chart along with the stock GTI measurements.
With none of the runners blocked the airflow measured is shown on the next chart:
An aftermarket intake manifold flow test was conducted and the results were compared with the stock Mk7 GTI intake manifold.
All individual runner measurements of the aftermarket intake manifold showed an increase versus the stock GTI intake manifold.
Increases ranged from 3% to 12%.
With all runners open there was no measurable increase in the airflow through the intake manifold.