Diffusion Confusion

What do these things do? Why do we love this carbon creation that hits on every low gutter and scrapes on everything.? We just do! A well designed rear diffuser creates a pressure zone behind the car that feeds the rear wing and adds better overall downforce in a straight away for stability. This downforce comes at the cost, but luckily the high aerodynamic drag coefficient is reduced by the diffuser also as it smoothes airflow around the rear.

The key to the compromise is smooth airflow, so these parts are usually linked with a front splitter and smooth undertray thats allows for the smooth airflow right beneath the car that effectively sucks the car to the road. That's why F1 teams spend wind tunnel money. A small wing or undertray adjustment can have a huge change in straight line speed or downforce through cornering, even though the under body of the car is flat.

For lovers of the wingless Fd this is a true alternative to the GT wing. That can add downforce in a subtle way. However, use it in combination with a GT wing and an all round aero package should see lap times dropping as cornering speeds increase.

The four main companies producing these for the Fd are RE-Amemiya, Sanai-D, Craft Company and Ken Style. There are others that have some effect but none are as full on as these. If you do manage to attach one to the rear of your Fd, please be careful when reversing. Carbon is expensive.

Russ