Questions: Technical development of an R2 rally car

[Mirek]

And same engine in R2 and R3 C category, so what is the difference?

Just one point... this has been like that since the introduction of R classes. It's not the number but the letter what represents the engine. The number represents allowed level of tuning. R2C and R3C have always had same cylinder capacity just to my knowledge no manufacturer ever homologated R2C car. Same case is R1B and R2B where both are up to 1600 ccm but R1 is stock car while R2 is reasonably more advanced one.

[OldF]

I wondered from where the peculiar engine volumes come from but the coefficient is about 1,5 (927 * 1,5 = 1390,5 / 1067 * 1,5 = 1600,5 / 1333 * 1,5 = 1999,5)

I checked the turbo coefficient and it’s still 1,7 for petrol engines (1,5 for diesel engines). What could be the reason for such coefficient?

[stefanvv]

What could be the reason for such coefficient?

Turbo pressure?

[Sulland]

Just one point... this has been like that since the introduction of R classes. It's not the number but the letter what represents the engine. The number represents allowed level of tuning. R2C and R3C have always had same cylinder capacity just to my knowledge no manufacturer ever homologated R2C car. Same case is R1B and R2B where both are up to 1600 ccm but R1 is stock car while R2 is reasonably more advanced one.

I hate to say it (again), but you are correct. All homologated R2s so far has been R2Bs.

VW has a 1390 engine. Have they talked to FIA?....

[skarderud]

Witch car are you thinking of, lundefaret? Mini 1,2t? Isnt it a 1.6?
Or something else?

[pantealex]

new mini is 1198ccm 3cylinder, 1499ccm 3cylinder and 1998ccm 4cylinder

[Lundefaret]

Witch car are you thinking of, lundefaret? Mini 1,2t? Isnt it a 1.6?
Or something else?

Hmmm...

[pantealex]

All homologated R2s so far has been R2Bs.

M-Sport has made new nose Fiesta "R2" with 1.0T (and 5door version of R2 also) but maybe it´s not homologated

[ChristianArp]

That's somewhat strange. Up to 1333 ccm turbocharged in R3? Current R3T cars have up to 1620 ccm.

Will the upcoming rule change then nullify the specific document of regulations, that are already in place for R3T and R3D? Remember, these two classes are currently not included in the R-class document that has been linked to.
If not, then you should still be able to homologate a 1620ccm R3T-car. Seems weird to have two documents with different limitations for the same principle of car (eg. 2wd, turbo, R3-level tuning) though.

If these changes are implemented, and the specific document about R3T and R3D is removed, would that not mean that the currently homologated R3T cars are in a situation, where they do not comply with FIA regulations, yet comply with their still-valid homologation documents?

Whichever of the above thoughts, it just makes very little sense to me.