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      12-03-2009, 03:30 PM   #13
swamp2
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Drives: E92 M3
Join Date: Sep 2006
Location: San Diego, CA USA

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Do some simple math, our cars are about 9 lb/hp. So it takes losing about 9 lb to gain the acceleration of 1 hp. Now of course weight loss is better than power gain alone since it improves handling. My somewhat coarse evaluation of being able to actually feel and notice a change is something like the weight of a peson ~150lb or very roughly 15 hp. Also losing weight on tires/wheels is more effective than losing no rotating mass but I am very skeptical of these somewhat arbitrary factors of 1 to 8 or 1 to 4 or whatever. I will try some simulation to see if I can get some better numbers.