I get the feeling that a lot of people make the simple mistake of regarding car shapes in profile. With a production car this is a valid exercise as there are wide flat sections on the hood,turret and trunk. That ain't so on many liners , lakesters and tanks. There may be a force generated
perpendicular to the surface of the bodywork but that surface has only very small areas which are
parallel to the track. So the amount of this force expressed as "lift" on the car is smaller than anticipated.....
looks like a good aerofoil......
but has no horizontal surface...
This of course has no bearing on the straight line stability and much of what Ak explains above. Interesting what Ak mentions about the brake bias on the liner....we have only rears