Has anyone seen any websites that detail or have details on the aerodynamics of the DTM sedans when they were in their heyday? I'm really interested in their front end aerodynamic treatment - the ducting and ground effects etc.

Actually let me broaden this to GT's as well. How have the front end aerodynamics changed in the past 15 years and why?

Not quite DTM, but the best study material on front end aero (in my opinion) is here: http://mulsannescorner.com/

The solutions for front end aero for DTM cars have today become more and more like those used for LMP cars, with the main differences being the use of a conventional hood, front placed radiators and a front engine.

Modern DTM cars use a space frame chassis with a carbon fibre survival cell so they are not limited to what the stock chassi can offer. The engine and the driver is placed quite far back in the car.

http://upload.wikimedia.org/wikipedia/comm...A4-DTM_2008.JPG
http://lh3.ggpht.com/_ZfOXWlGjnMA/Rjcb1AiT...diA4DTM.005.jpg
http://www.racecar-engineering.com/article...04/1/0/dtm.html

Hi Neil,

Not sure, what you would call the heyday's of DTM, but you may find the information's on the following website interesting.
It's about the aero development of the then championship winning ITC Opel Calibra (1996).
One of the main features of this cars where the electrical/hydraulical "shutters" for the radiator and brakes ducts, allowing the
ducts to be closed off during the lap to alter the aerodynamic downforce/drag configuration during a lap.
There are also some nice CFD images on this side.

http://www.v6calibra.net/docs/calibra_aero...Aerodynamic.htm

in the picture below, you will see the "shutters" in the open position (see the Opel Team Joest stickers)

Thank you for the replies. The planned sports sedan ( http://www.sportssedans.com.au/news/news.html ) will have a mid-front engine with No2 plug of a 4cyl engine virtually under the windscreen. The engine will use a short torque tube arrangement to a Hewland FTR transaxle and push-rod suspension at all four corners. Body is yet to be decided, but will be chosen for aero and availability reasons...it will be made in FG - I'm suggesting current 1/3 series BMW coupes. All up weight for under 2lt car planned to be 700kg-ish.
The rules dictate some limitations. Front of chassis will be raised to allow good front end downforce via splitter etc. Tunnels are banned and rear diffuser is limited...however aero is one area that has little attention given it until the car is virtually complete. We would prefer to include this at the start of the deliberations as is would give an advantage (if done correctly) that would not be easily addressed by the competition. A 1.2lt turbo engine is also under consideration, though the current engine is based on a 2lt lancia/fiat/alfa 16V engine of approximately 280bhp.
I fear the shutter idea, whilst not beyond the capabilities of control of the Motec EMS...would be deemed a moveable aerodynamic device.