agree with apollo.....think alot of ppl are sayin the same thing on the pp.
in another champ i used the Epson NSX where everyone had 552bhp, and i put it on pole every race bar 1, so i know the car has pace, just 605 is a bit hard.....
the only thing i dont agree with yet is the Z....Adz puttin ballest on is redic....u had to brake, accel n steer that extra weight n the hp u get for it is pants......u only need to check ur power to weight to see its a cack idea.
like to know ur transmission set ups coz maybe ur not setting the car up to have u in the power band for the length of the straight....
mayb ur Z needs some TLC (a wash, oil change, engine rebuild n body regidity)