nice little write up about grpN
http://www.rallye-info.com/carspecs.asp?car=270
First event: Tour de Corse 1988.
Renault R21 Turbo General Information
The Renault R21 came at a time when many things changed in Renault's car design. The R21 was a clear cut, straight, no nonsense design, it was a modern and functional saloon and it's ride would earn the highest ratings even today. Indeed the R21 is definitely one of the most underrated cars there ever was. Such superb was its ride and comfort that, believe it or not, its successor, the Renault Laguna, could hardly better the R21 - and the Laguna is absolutely reknown for its fantastic ride! But more so, the R21 Turbo was the first turbo charged Renault with an OHC camshaft layout - yes, all the incredible R5 versions were UHC! More, Renault was one of the first brands to market FWD, yet they regularly featured longitudinal engines, a strange layout combined with FWD it seems nowadays. The R21 came right at the time this was to change and as a result the R21 is probably the only car ever designed that was available with longitudinal as well as transverse engines - the R5 changed to transverse engines following a face lift, but with the R21 the diesels and the 2.2 petrol were longitudinal, all other engines transverse in one and the same model and year of car!
But coming to rally terms, the R21 was indeed made in a version called R21 Turbo Quadra - a turbo 4x4. This however was a limited edition road car with production numbers too small for group A & group N homologation, such a serious return of Renault to the WRC was eliminated by the rules. Funny enough this fate Renault shared with Peugeot: The R21 Turbo Quadra and the Peugeot 405 T16 where both turbo 4x4 cars limited to 400 units, which would have been sufficient for group 4, but not for the post 1987 regs. And both these brands were full of criticism when the FIA changed the WRC from group B to group A. Both Renault and Peugeot now claimed they created these cars as homologation specials and would return to the WRC if it wasn't for the required 5000 units per annum! Only the FWD version of the R21 Turbo was produced in sufficient numbers and with FWD there seemed to be not much point in a powerful group A version - again a similar fate to Peugeot, where only the non-turbo 405 MI16x4 was made in sufficient numbers for modern homologation.
The group N version of the R21 Turbo however was superb and famous, it only had one problem: it stayed in the shadow of the group N R5 GT Turbo! Nevertheless, compared to the R5 GT Turbo the R21 Turbo had a 2.0 engine that "only" produced 175BHP but an amazing 270NM torque. Bozian actually had an R21 Turbo up to 245BHP, which only shows what could have been possible with some group A development. However a group A project was never suported, so the car was officially never more than group N. The torque could easily make up for weight and size and made the R21 a serious contender in the faster and more flowing stages. The car came to major fame in French regional events with drivers as Michel Rats and Philippe Bugalski. Bugalski also took the car to WRC events, but he failed to prove the car's potential, twice he had to withdraw following road accidents!
One of the most interesting driver pairings in the WRC ever was on this occasion: Rallye Monte Carlo 1990, #0 course opening car, R21 Turbo, driver Jean Alesi, navigator Jean-Marie Ballestre.