Originally Posted by Franc Rauscher
I am curious to try something but wonder the consequences. If I put my spare set of 18" wheels on the back, would it not improve my launch and 1/4 times?
What would it do to normal driving? Ground speed to engine RPMs would be different. Would the TC come on?
roadster with a stick
Smaller wheels would equal less angular moment of inertia. The weight and diameter of the wheels make them harder to spin. The NA Crossfire cannot launch very effectively because of the large wheels; it doesn't have any resulting wheel spin and bogs down since rpms aren't high enough to be where they need to be on torque curve for best acceleration. Even if the diameter of your tires on the 18" wheels is the same as the 19" you would improve the launch because the wheel mass would be less, and the mass would be closer to the axis of rotation. I don't know if the 3.8% speedo difference results in any issues with ABS or TC.