While I understand the theory of heel-toe downshifting I've always wondered if there is a tolerance to what RPM range you should attempt to match or does bringing the engine speed too far over the transmission speed just is damaging? i.e. Should you be within X RPM of the transmission speed when you blip the throttle?
To give an example to explain what I mean:
Perfect scenario - I'm driving in third at 2,000 RPM and downshift into second. I blip the throttle to 3,000 RPM and when the clutch is released the revs stay at 3,000 RPM (the actual RPM of the transmission).
Hypothetical scenario - I'm driving in third at 2,000 RPM and downshift into second. I blip the throttle to 4,500 RPM and when the clutch is released the revs drop to 3,000 RPM (the actual RPM of the transmission).
Is that hypothetical scenario causing just as much wear to the clutch compared to not rev-matching at all?