Stock Airbox with Stock TIP

After seeing the substantial decrease in airflow through the intake with the addition of the stock Turbocharger Inlet Pipe the next logical question was how the results would go with the stock airbox in the stock configuration.

The Setup:

To recap the last test, it was conducted with the highest flowing configuration that the stock airbox has produced so far.  The stock paper filter is replaced by an aFe Power dry fabric air filter and the grate located in the lower half of the airbox is removed.  This configuration served as the baseline for the subsequent test that added the TIP to the intake.

With the substantial drop in airflow, even with the high flowing stock airbox configuration, the question became how much further would the airflow drop if the completely stock airbox and filter were used?

The Test:

The stock intake along with stock Turbo Inlet Pipe is attached to the flowbench using a straight coupler hose and airflow at 28″ of depression is recorded.

Flowbench test of Mk7 GTI OEM Turbine Inlet Pipe
Flowbench test of Mk7 GTI OEM Turbine Inlet Pipe

The Results:

Stock Airbox with Stock TIP Airflow Test
Stock Airbox with Stock TIP Airflow Test

Not surprisingly the airflow dropped in comparison to the aFe filter test.  What is notable is the amount of the drop, only 8 CFM.

By comparison, without the TIP in place the difference in airflow between the stock airbox setup and the aFe filter setup, the best case arrangement, is 26 CFM.

Up Next:

The straight coupler that attaches the TIP to the flowbench is not quite a representation of the inlet to the turbocharger.  A future investigation will involve making a 3D printed model of the compressor housing inlet to serve as the adapter to the flowbench.

4 thoughts on “Stock Airbox with Stock TIP”

  1. Alexander Paulouski

    Can you please add one more test for grade.
    It would be interesting to see the results for example for the next configuration:
    Stock with grade + AFE + MST Hose + TIP

    The idea is to install everything possible, but leave grade inside.
    Also I will recommend to make test with new REVO inlet pipe. It is the best aftermarket product I guess.

    1. Hey Alexander, the next time I have the flow bench out and the necessary parts off the car I’ll try that combination to see how it does. I am working on getting results with the Revo inlet pipe. Thanks for the suggestions.

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