my vehicross 1997 3.2 jap model went on the dyno today i was running 285/85/16 bf goodrich mud train tyres and only produced 141.7 hp/5163 and 165lbf/ft/2854 rpm is this about correct as i have been reading that tyre size has a lot of diferance lowering the bhp as theirs a lot of weight in all that rubber and wots the total raito 6.328 mean on the dyno chart?