Technical ESP or not ESP

[Goudrons]

I can, it's what I've done for a living for 30 years.

I just can't seem to want to do it for free, once I get home!

 

[ExBluebird]

The ECU is holding idle revs, or at least trying to. As the clutch engages the revs drop with the load so it countered. There's no magic involved.