How do you know for your displayed times on those tracks?
Are those times set by factory teams? by magazine reviewers? or in amateur race classes? or best times recorded on track days?
Most of these tracks are not your typical test tracks for setting performance data.
So you say wat is 'usually used' for setting a test time, but you have no source on where the times you display even come from. Which party has set those times or even when.
Why would this be a set standard?!?It should come as no surpise that the newer car outperforms the older model.
The z4m has (on paper) slightly more HP, has a far better power/weight ratio (or bhp per tonne) as the z4m is about 100-150kg lighter than the e89 35is, has an LSD, floating brake rotors etc.
True the n54 engine has a stronger torque curve, which certainly explains the slightly better acceleration (note: only 0.1 or 0.2sec), but braking distance, cornering speeds etc, the z4m has on paper better engineering inputs.
I dont know if you've ever been on a track, but weight is a bitch. So I'm not so sure if a z4m would be tested with current tyre tech that the outcome is as you claim.