I have said this before, but, IMO this is what it needs:
Front engined, RWD, manufacturers can use any mass produced body shell, suspension main pick up points [ strut tops ] to be the same + or - 1” [ rear strut tops can be raised up to 4”] , exhaust and gearbox tunnels free, additional front and rear suspension supports allowed, engine bulkhead in the same position, wheels arch extensions up to 4”, non ferrous boot and bonnet, steel doors, current safety rules apply, multi point cage, front a rear spoilers [ similar to current WRC cars] glass front screen, Perspex allowed for other windows.
Max 2.5cc, 4cly, 10,000 rpm limit, must run on pump fuel [ v power etc ] Max noise 108 db
Max 6 speeds, sequential, manual shift, i.e a Gear stick, ratios free
Mechanical slip limiting differentials only, ratio’s free
Wheels and tyres.
16” maximum, up to 10” wide overall
Free, will obviously have to fit inside 16” wheels, No ABS.
Minimum weight 900kgs.
Somehow keep a cap of £150k on the price of the cars, this will make if more affordable, and to encourage manufacturers to supply cars to private teams.
This will make the cars look and Sound So much better, you ask many rally fans, what there favourite rally car is, and they will probably say either Andy Burtons Pug, or a big power Escort, why, the Noise, and with RWD a lot more visual car movement.
Probably then the most important thing is get the TV coverage improved, make it more of a show like F1, many more spectator stages , similar to day one of the old RAC rally, what with in car technology now and smaller cameras etc = better coverage. On board timings, stage comparisons, and,,,,,,,,,,, encourage the drivers and co drivers to be more humorous, less PR orientated, show they have a good sense of humour.
These cars would have to run in a 2wd series only, along with any other 2wd car that currently runs all in there relevant class. So long as you have the best drivers in the world in them, they will be the fastest cars