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388 Posts
As a first estimate of the improvement in your 0-60 time, we can assume that getting the power down will not be a problem (probably true in the dry) and that, to accelerate from 0-60, it is only necessary for the engine to produce a certain amount of energy (not true but probably a reasonable first-order approximation.) 30bhp extra over the standard 175 gives an increase of ~17%. If we take the 0-60 time of the stock car as 7 seconds - which most people reckon to be reasonable for the ZS once the engine has loosened up a bit - then that would suggest that an extra 30bhp may cut that to about 6 seconds (7/1.17) - which stacks up nicely with 180boy's observations.
HTH,
S.
HTH,
S.