Originally Posted by marko
thats proven on the rolling road mate, stock is 128ftlb and 157bhp
with the bmc (and nothing else) the car made 141ftlb and 161.4bhp
sorry - missing the point - the rolling road isnt sensitive enough to be able to realy pick up such low bhp / lb/ft differences IMO. a slight temperature change / atmospheric change can give +/- 10bhp no probs. The other thing is that the RR can be 'influenced' by the operator to give good results of his tuning!
Back in the days of minis etc an airfilter swap made a big difference - on modern stuff where £££ has been spent on R&D for fuel economy etc the difference is negligible excet for noise.
true if you were sticking a turbo on the likelyhood of the oe filter being good enough would be marginal and would require a change...
my 'other car' fluctuates between 490 and 530 bhp on the same RR in the same day - some of it way be tyre slip however ;-)