Sounds a bit more like the test was supposed to be with the current car then.
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If you take a quick guesstimate on the following:
How much quicker has a R5/Rally2 car become pr km ss, from the class came and till today?
Difficult to find matching stages
Fafe Portugal
2021 Lappi Polo 97.7 km/h
2015 Lappi Fabia 95.1 km/h
Gandesa Catalunya
2019 Loubet Fabia evo 96.0 km/h
2015 Chardonnet DS3 90.3 km/h
Leustu Finland
2019 Rovanperä Fabia evo 111.0 km/h (stage was 500 m longer, possibly making the stage a bit slower with one junction turn)
2014 Tänak Fiesta 109.1 km/h
Riudecanyes Catalunya
2019 Solans Polo 92.9 km/h (damp conditions?)
2014 Chardonnet DS3 94.1 km/h
Looking at the numbers you found, it seems like we can say that aprox 2 sec in average speed are not far from the development of R5 from 2013 and until today. It will wary from car to car, surface to surface, and driver to driver.
The main reason behind the question is to show the huge success the joker thinking and rules and regulations to go with that.
This is a very good way to keep development and cost down for the users.
With a 2013 Fiesta, that is updraded over the years, at least on loose surface can still fight for podiums.
This makes for a bright future for the new Rally3 class starting up in 2021, that follows the same pattern!
What about new Hyundai N Rally 2?we know date about debut of the car ?
It was said 2 pages ago that it's 1-2 months delayed. That would mean earliest at the start of august.
I was checking homologation list for this year and found:
Polo - 3 jokers in march (prbly the upgrade that wasn't sure to come after VW disbanded motorsport)
C3 - 3 jokers also mostly in March ("Rally2" upgrade?)
Fabia - 2 jokers (January, was announced)
Fiesta and i20 nothing
Hyundai has a new car coming, but what about MSport? Are they giving up on Rally2 and focusing on R3 and below?