Mk7 GTI Stock Airbox with channeling piece added

More Stock Airbox Work – Duct Test

Looking some more at how the stock air intake system performs in terms of airflow the channel that runs along the top of the radiator support is added to the airbox.

To begin, the stock intake from the turbo inlet elbow through to the airbox, including stock filter with snow grate, is flowed for a baseline value of 336 CFM.

Mk7 GTI Stock Airbox on Flowbench
Mk7 GTI Stock Airbox on Flowbench

Then the channel piece is attached to the airbox.

In the case of this particular part the portion immediately in front of the airbox had been modified by cutting out some holes in the front side.

Mk7 GTI Stock Airbox with channeling piece added
Mk7 GTI Stock Airbox with channeling piece added

With this part attached the airflow reading was unchanged.

Next some towels were used to block off the “modification” openings in the channel piece.

Channel piece with holes blocked off
Channel piece with holes blocked off

Reattaching this piece to the flow bench and measuring again showed a decrease in airflow of 9 CFM.

Mk7 GTI Intake Duct Flow Test
Mk7 GTI Intake Duct Flow Test

Conclusion:

Modifying this channeling piece to add holes on the driver side, in front of the airbox, netted a slight increase in airflow, approximately 8-9 CFM, through the stock intake system.

7 thoughts on “More Stock Airbox Work – Duct Test”

  1. Hi.
    Did you try leaving the Snow Gate in with just the performance air filter. to see what gains that achieved??.

  2. Hi Jeff,

    You say this channel piece was modified by “cutting out some holes in the front side.” Does this mean there were just holes drill in these blocked off sections? Or were they completely removed using a dremel?

    Also,

    Any update on testing airflow/temp change with the block off plate used/simulated on this channel? Looks like the R600 eliminates this opening as well as ECS Tuning’s CF Intake.

    Thank you,

    Kyle

    1. Hey Kyle, on that opening in the front it was opened completely, not just some holes cut into it.

      I did some pulls with the block off plate not installed to check the temps going into the airbox. I need to make some comparison pulls with it covered to see if there’s much difference. I haven’t had it on the flow bench. I may get around to try that this weekend if things work out.

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