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Re: Aerodynamics question..
Posted by KevinC [Email] (more from KevinC) on Sun, 9 Dec 2018 10:56:50
In Reply to: Aerodynamics question.., Steven Mitchem, Wed, 5 Dec 2018 12:45:23
I believe you a referring to a vortex generator, mounted at the rear edge of the roof. It is more designed to reduce drag to go faster.
To increase rear downforce you need either a bigger rear wing, or a functional rear diffuser. Difusser harder to put on the car but more discrete. Rear wing much easier to adjust. On my 9000 track car going with rear wing, adjustable.
Standard Saab 9000 Aero rear very stable at 100 mph. I live in Europe and my Aero has spent much time above 125mph, and the design is very good right up to 160mph which a modified Saab can hold and maintain, as long as all the undertrays are present and well secured.
For track use would suggest experimenting with tire pressures, lower in rear can really help sometimes on corners. Giving up some top speed for 400 lbs of more downforce at 100mph should really help tighen up the rear, but the adjustments possible with a functional wing make changes possible to suit fuel loads, tire changes, different tracks. There are several 9000's with the rear axles cut near each end and plates welded in, where shims cam be used to set various camber and toe settings on the rear. If set up properly this would really tighten up the rear on fast corners, at the cost of some straight line stability and tire wear.
Good luck whatever you decide works best for you.
posted by 82.10.1...
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