I think what 99-Boxster-MK is thinking of is that the diameter of a wheel can affect the acceleration of the car. People that plus-size their wheels can see a small effect on their 1/4 mile times for instance.
This is because of the bigger wheel usually being heavier than the smaller wheel, and the weight being distributed further out along the axis of rotation.
However, if you're really seeing a decrease in performance because of a slight increase in wheel weight and diameter, the problem is likely that your car is severely underpowered. It's more of a 100-150 HP car problem than a 240 HP problem.
|