Project S2000: Part 20 – Stock Air Box Modifications And Not Going Faster
Khiem Dinh is an engineer for Honeywell Turbo Technologies at the time of this writing. All statements and opinions expressed by Khiem Dinh are solely those of Khiem Dinh and not reflective of Honeywell Turbo Technologies.
After testing the ram air/cold air NACA duct in Part 19, I noticed a trend in the intake manifold pressure where it drops as the engine approaches redline. A member of one of the forums had commented on some of his own testing showing that removing the lid of the air box resulted in less pressure drop. He had used a pressure gauge attached to the intake tube common on off-road trucks to gauge when the air filter is dirty. So this got me looking into the guts of the stock air box. Was the 90 degree internal tube a flow restriction?