Rear Spoiler

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This is a sample picture

The use of low profile rear spoilers that reduce over all drag.

Instructions for mod

Remove any existing wing type spoiler or rear cargo rack. Buy or fabricate your aero spoiler and install.
The type of spoiler you are looking for will be small, it will be 5/8 inches long plug or minus 1/4 inch (15mm +/-6mm), 3/4 of an inch seems to be the sweet spot (19-20mm).
The spoiler tilt needs to be about 20 degrees off a vertical axis.

User experiences

User data
User Name Car Make, Model, Year Cost of Mod Time to Perform Mod MPG Before Mod MPG After Mod MPG improvement guess Instruction Link
Example Data Saand Example Data Mazda, 626, 1991 Example Data $5 USD Example Data 1 Hour Example Data 27.2 Example Data 29.8 User mod detail or measurement detailed data

Problems / Consequences of mod

If the rear spoiler is not properly made then it will increase drag.


Forum thread links

Rear spoilers lengths and angles

Induced drag spoilers

External links

Flow Field Features and Aerodynamic Drag of Passenger Car <<< Page 26, Rear spoilers

How to decide whether to remover a rear spoiler to decrease drag