Rally 3 class

[Andre Oliveira]

Armstrong and Fontana in development test in Portugal

https://www.facebook.com/share/p/1G4...ibextid=wwXIfr

[BBman]

They are consistently at around 2 seconds/km slower that Rally 2. Not sure if that is good or bad, but there is definetly room for another mm in restrictor size.

Referring back to my comment from 2023, which was argued upon. At Rally di Roma Capitale, the leading Rally 3 was 2.9s/km from the winning RC2. Ok, not a top driver, but neither was the leading Rally 4 only 0.4s/km away.
It is obvious that tarmac is not a strong surface for the Rally 3. But it doesn't get much better on gravel. At Acropolis the difference between Solberg and Turkkan Ali was... 2.9s/km. Yet again, a particular rally and you cannot compare the two drivers, even if Turkkan is a very talented driver (imo). But even compared to Prokop, the difference is still over 2.1s/km.

The point I want to make is that the rallies where you have a Rally 3 under 2s/km vs Rally 2 are the exceptions.
I do not want to bash the class, but I do not believe that this was the intended performance gap, especially considering the cost.

[Sulland]

Does FIA have any plans to change anything on the Rally3 class tech?

Maybe give the restrictor 1 more mm, to get the SS speed per km a bit closer to the Rally2 class?

[Gordini]

How much hp will you get with changing the restriction from 31 to 32 mm, and from 31 to 33 mm?

[Jarek Z]

Kowalczyk's win in Czech Republic was Renault’s maiden win in ERC3 category:
https://www.fiaerc.com/en/news/doubl...d-erc3-victory

[OldF]

How much hp will you get with changing the restriction from 31 to 32 mm, and from 31 to 33 mm?

Increasing the diameter of a 30 mm restrictor by 1 mm increases the area by 6,6 % and assuming a constant air to fuel ratio the power would also increase by 6,6 %

31 mm -> 32 mm = (32 * 32) / (31 * 31) = 1,0656 => 6,56 %
31 mm -> 33 mm = (33 * 33) / (31 * 31) = 1,1332 => 13,3 %