Listen, this is a murky subject for me... so bear with me. If the pit limiter is 49.7mph or 80 km per hour... it does not matter if you are driving on the straight or in corner... the driver can floor the pedal and the speed is 80 k per hour. On the slowest section, in a chicane, or on the straight. Although... if the pit-limiter is said to the revs that would mean that, say, that 5000 RPM in a corner does not mean the same as on the straight. But THAT can't be correct, because penalties for speeding in the pit are determined not on the revs of the car but on the speed... what if a Mercedes-engine revs higher than the Ferrari? Or if we are on sea-level or on a higher ground? That would mean that every team, every race, would have to test the pit-limiter per day, per hour, per atmospheric pressure reigning weather! That would mean 60 infringements of pit-limit speeds at every first free practice sessions...
So... my estimation is that the pit-limiter per car works on the speed of the car, not on the revs.
Anyway, it is not important, I believe the current system is the least bad solution, I think I understand it now, but I still have trouble how drivers could monitor their deltas...truthfully and to the spirit of the rules. They are all scoundrels, these boys...
The problem is, how much speed they sacrifice if they drive on speed limiter. On the straigh instead of 300kph they drive 80kph, loss 220kph. Some of the slowest corners of F1 are below 80kph, so no speed lost.
Which would mean that if you are unlucky and speed limiters needs to gets activated when you coming on the straight, compared to the guy who just left you would lose a lot of time.
Second all F1 engines have the same rev limit. Difference is the gears they using which fixed for the season. But speed limit works on speed anyway.