by conrod » Fri Jun 29, 2012 6:20 am
Hi Steve,
there was 500 2.5 road cars built in 1990> to homologate the 2.5 engine (and a few other parts) This car was called a "Sport Evolution" or "Evo Sport" It was much the same scenario as the RS500, to homologate the trick parts for Gp.A. So to answer your question, the 2.5 engine was homologated for Gp.A, but as Gp.A was nearly dead in 1990 most of the 2.5 race M3's were to DTM spec.(including, strangely enough the B&H cars that raced in Australia, under supposed "Gp.A" rules!) The DTM allowed much more freedom, such as slide throttle/8 injectors, bigger valves,cams, different exhaust manifolds, raised inner wheelarches etc. etc. The Holinger 6 speed H6S box was also homolgated in Nov. 1991. This was a much better box than the 6 speed Getrag they had been using. The last (1992) spec. of the 2.5 DTM engine produced 355hp @9200rpm.
Conrad
Hi Steve,
there was 500 2.5 road cars built in 1990> to homologate the 2.5 engine (and a few other parts) This car was called a "Sport Evolution" or "Evo Sport" It was much the same scenario as the RS500, to homologate the trick parts for Gp.A. So to answer your question, the 2.5 engine was homologated for Gp.A, but as Gp.A was nearly dead in 1990 most of the 2.5 race M3's were to DTM spec.(including, strangely enough the B&H cars that raced in Australia, under supposed "Gp.A" rules!) The DTM allowed much more freedom, such as slide throttle/8 injectors, bigger valves,cams, different exhaust manifolds, raised inner wheelarches etc. etc. The Holinger 6 speed H6S box was also homolgated in Nov. 1991. This was a much better box than the 6 speed Getrag they had been using. The last (1992) spec. of the 2.5 DTM engine produced 355hp @9200rpm.
Conrad