A 2012 Audi A4.
With a new engine (Rotary 3 v1), this Audi can go really fast in 6th gear, idling!
The suspension is a combined hinge/spring that can get some torture without breaking.
If you want to see all the machinery, just press somewhere on the body, and move to back.
So, the controls:
DOWN: brake (remember: autodisengage)
UP: accelerator
A / Z: gear up/down (On the inside of the car there is a box that shows gear.)
R N 1 2 3 4 5 6
So, thats all I think.
Upd1: V3.75! I've skipped a lot of updates because they exploded. 

                      The max speed now is of 260 km/h. The gearbox changed a lot,
                      because the radiuses were all very small, and it was very slow at
                      first gear. Now, the max speed on each gear is:
                      1:31 km/h
                      2:40 km/h
                      3:60 km/h
                      4:100 km/h
                      5:160 km/h
                      6:260 km/h (Note that the back wheel starts to shake with full 
                                         throttle, be careful).
                      This version featured a dashboard, but I couldn't make the 
                      speedometer. So, I'm releasing this too early.
Upd2: V3.76! This version is featuring just two things:
                      Longer course
                      Harder suspension