Sebastian, i think the answer to this is the weight--to-- hp, see the 280SL is 20 hp more
than the 250SL ,230SL,and so the 230 is 60kg less in weight than the others ,i would think
that is why the weight would make that differents, remember, that 60kg is 10.1/2 stone,
thats the weight of the average woman, 20hp is not much ,but at very high speeds
its critical, example i think it was a Jaguar E type 1963 , that to acheive 150mph,
they removed the front licence plate on the last timed run, first run only achieved 149. point something.
Someone here may be able to clarify that for me. Regards.