skgoa wrote:No, DTM cars are allowed to be developed to have a performance advantage. The spec parts are the ones that would cost a lot of money to develop and produce on your own but don't give much perfomrance advantage. Engine, suspension and aerodynamics are developed by each manufacturer on their own. And the different concepts and philosophies do result in some differentiation. E.g. Audi seems to now have the faster/more drivable package on most tracks, at least over a single lap. Mercedes was unbeatable at the start of the season and are reputed to have the best aero but they have now fallen behind quite a bit, especially in qualifying. BMW is reputed to have a much stronger engine than the other two, which has given them quite an advantage on certain tracks.
And quite frankly, DTM cars look nothing like the cars they are named after. I referred to NASCAR because they are now making the switch to cars that look much more like the cars they are meant to represent, yet they are very tightly regulated in their performance to not get any advantage.
suspension is also spec parts, the rear wing is spec'ed so there are limits to what they can do with aerodynamics and it is tested at windtunnels before the season tweaked to be more or less equal and frozen.
The engines are different but all of the same configuration and have intake restrictors,
so that more less leaves setup and driver as the difference
The car might not look much like any production car, but when you see the front they are very easily recognizable as being bmw, audi or merc