OK! Before I start, I have to make clear that there seems to be no single source of authoritative information on the Clio Mk1 rally cars, certainly not in English anyway. What follows is kind of a hash of some info Ive gathered myself over the past few years, so its by no means definitive and there could be some mistakes.
Renault had been at the forefront of Group B rallying with the 350bhp Maxi 5 Turbo in the mid 1980s, when Group B was axed due a string of fatal accidents. The Maxi 5 was legendary for its tarmac capabilities - notably beating the 420bhp 4WD Peugeot 205 T16 and Lancia 037 Rally on the blacktop at the Tour de Corse in 1985.
http://images.cardomain.com/member_images/10/web/286000-286999/286766_44_full.jpg
Renault 5 Turbo 2
That was some real pedigree in Renaults blood, but it also represented an almost unattainable benchmark for the first Clio rally car in 1992... almost unattainable. By 1992, Group B was a distant memory and Group A was now the premier rallying arena. It was also now attracting cars like the Lancia Delta Integrale and Ford Escort Cosworth. The first works Clio was homologated as the Clio 16V, so had to use the 1764cc engine.
Unlike the 5 GT Turbos engine, the Clio 16Vs F7P was not a turbo unit and could never reach power figures like the Maxi 5 Turbo. However, the 1.8 works Clio was, mile for mile, even faster than the Maxi 5 Turbo on the tarmac. That is some achievement!! It was intended for Group N rallying, but actually eventually entered into Group A (against all the 4WD turbo nutters). It was that good!!
http://images.cardomain.com/member_images/10/web/286000-286999/286766_25_full.jpg
The Clio 16V - homologation car for the 1992 Group A & N works Clio
The Mk1 Clios finest hour came in 1993, when it got the famed 2.0 F7R lump. To meet rally rules, this car could now not be homologated as the Clio 16V and was instead homologated as the special edition 2.0 Clio Williams. Renault had decided to push out the boat and go for the full 2.0 litres that rally regulations allowed, but also wanted an engine with more torque at lower revs. The result was the F7R engine - not much more powerful than the F7P 1.8, but with a much better torque curve. It was estimated at the time that the 2.0 was 1.5-2.0 seconds per mile faster than the 1.8 - which was already faster than the Maxi 5 Turbo.
http://images.cardomain.com/member_images/10/web/286000-286999/286766_41_full.jpg
Clio Williams - homologation car for the 1993-5 Group A & N Clio
Renault later produced the Maxi Clio 2.0 for the 1994 season - fat arches being the most obvious addition to the car. This is the one that everyone remembers and it had a very successful season, giving the 4WD turbo cars some bloody noses. I think it carried on into the 1995 season, but finished after this because the Williams had finished production by then and with it ended the ability to homologate the Clio works car.
Various pics of Group A 1994-5 Clio Maxi below:
http://images.cardomain.com/member_images/10/web/286000-286999/286766_43_full.jpg
http://images.cardomain.com/member_images/10/web/286000-286999/286766_40_full.jpg
http://images.cardomain.com/member_images/10/web/286000-286999/286766_27_full.jpg
http://images.cardomain.com/member_images/10/web/286000-286999/286766_3_full.jpg