verticalflight

I recently purchased a Magnehelic gauge to measure air pressure on various parts of my 964 with RWB bodykit.

Read more here and here.

Below are pics of the unit and how we routed hose to do the measurements. Note I have a radiator now in the front, which dumps air below the car. I am looking at ways to route the air differently so as to not create lift in the front.

Here are my readings: (all at 50 mph)

FRONT BUMPER
- In front of the bumper, 1.0
- Inside the radiator exit below the car 0.9
- At the radiator exit below the car 0.85
- Car stopped, fans only, at exit 0.2

FRONT FENDERS
- Outside of fender exposed to outside air flow 0.1
- Edge of fender 0.4
- Just inside fender 0.45
- Inside fender nearish bottom front 0.5
- Insider fender, at bottom of front bumper 0.3

FRONT/TRUNK
- On hood, front -0.4
- On hood, center -0.8
- On hood, near windshield 0.75

DECKLID
- Front of grille 0.55
- Past the grille 0.85

Things that made sense to me:

- It looks like most of the air coming through front bumper is going out the air exit under the car past the radiator (1.0 -> 0.85)
- Pressure past the decklid suggests the grille is an exit, this makes sense as in my car the intake is actually in the backseat.

Things that surprised me:

- There is way more air pressure inside the fenders than expected(air from the ground?)
- Interesting how the pressure changes along the hood from negative to positive.