very interesting, i must admit i had totally overlooked the areodynamics and yes that does ake a lot of sense, i guess the only place that bhp will affect speed will be without drag.
i managed 125mph with around 80bhp and that was in slip stream behind a 306 after that i could never manage to top 120 and that was with 100+bhp.
im guessing that the other factor to consider is gearing, im sure the GA box has longer ratios than the CA, i guessed that the 1.3 would go to 135mph ish on the rollers in fifth but just a guess mind. id guess the 1.6 would go to 145 on the rollers. again a guess and i dont expect to be able to achieve those kind of speeds on the roads with drag.
about 20 bhp lol, the GT was the red top version of the SR series and i believe it had 150bhp as std. i think this was due to a more aggressive inlet cam. whereas the Gti has around the 125-135bhp mark.
