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My very rough estimate for an otherwise stock manual FRS/BRZ was that a 6lb loss in wheel weight per corner was equivalent to a total gain of 2.5hp in a second gear pull. Also, a 1lb loss in tire weight is equivalent to gaining 1.5hp in second gear. These are smaller as you go up in gear, and larger in 1st. Additionally, the faster you accelerate (if you have more power to begin with for example), the more difference it makes
Im sure there is a tool online you can use to get a rough estimate as well.
Im working (slowly) on putting together a better spreadsheet tool to mathematically answer the question of how does rotating part X affect acceleration. Why? Because its interesting. Of course accuracy will depend on accuracy of inputs and some assumptions I made regarding geometry (different wheels have different weight distributions). But I'll see if I can get it done in the next few weeks and post it for you.
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