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Originally Posted by RedDevil
- Loose the mudflaps.
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I was going to suggest that as well
Replacing the mudflaps with a teardrop shape aft of the wheels is the most effective
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- Set those gurneys ahead of the front wheels in your close up picture at a sideways slant, that will lower the pressure under the car. (they are like that under my car, as OEM)
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Positioning these is quite tricky.
Flow already tends to be at an angle (going outboard) there.
That's why they are often positioned slightly inboard of the tyre, some curving around the arched bottom opening of the wheel well (i.e. around the opening that allows the wheel to steer)
Angling the spads could reduce their effectiveness.
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- Add gurneys ahead of and behind the rear wheels to push the air out and back in.
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I've seen them added in front of the rear wheels - my car has them as well - but not behind it ?
When adding spads in front of the rear wheels, take into account that the air is flowing outboard there (10-15°) ... unless the rear end of the car has a diffuser, i.e when the aft pan angles upwards, creating lower pressure aft, which straightens out the flow underneath.
It's a sedan, so it'd benefit from a slight diffuser effect at the rear.
Adding a lengthwise plate on the inside of the wheel would help as well - doing on the inside what a wheel skirt does on the outside.
When mounted on the axle, it'd be in a fixed position relative to the wheel, and could take the shape of a semi-circle where it's alongside the rim.
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the 2012 Insight has gurneys behind the rear wheels. See the link for details.
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