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Old 05-22-2019, 12:56 PM   #16 (permalink)
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IS - '92 BMW E36 318IS
90 day: 38.73 mpg (US)

90 - '95 Honda Civic EG4 VX
90 day: 43.6 mpg (US)
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Originally Posted by aerohead View Post
If the diffuser is designed for low drag,it will not have any separated flow for a VG to 'solve.'
The 'long' diffuser will be 2.8-degrees
The 'short' diffuser will be 4-degrees
That would be the end of story if designing for low drag.
VGs would only be a drag-inducing excrescence.
For a 'trackable' car,you'd want to follow Ferrari,which has 'valves' to control the diffuser as a drag reducing device.I think Freebeard is touching on that.
I do not question the operation of a diffuser. But in a car without diffuser, put the Vortex generators. For less drag and more downforce?.

He left a DYNA study on vgs and airtabs. And how they are placed in the back of the car.

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