Quote:
Originally Posted by fazm
first off .3 is pretty big in the power to weight ratio. also as weight increases, power to weight must also increase (a 2000lb car with 10/1 will be quicker than a 3000lb car with 10/1)
fyi last gen m3 (2008ish the 414hp/3726lb) had a power to weight of 9/1. just slightly better than the camaro, weighing in a little less, yet its quicker. not to mention it has under 300ft/lb of torque.
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Newton might argue with you about the advantage a 2000 lb car would have over a 3000 lb car with the same p/w ratio. F=ma is not an opinion.
There is more to the story than p/w ratio, of course, but there is no advantage to the lighter car as you said. You have to consider traction, power under the curve (not just peak numbers), gearing, etc.
You are correct that 0.3 is a sizeable difference in p/w ratio, really, the more telling value would be to plot p/w ratio of one car vs. another throughout the rpm range, otherwise you are just looking at the comparison at one point during acceleration. Either way, the 5.0 GT will probably have the advantage through much of the rpm range. When ford releases the dyno graph for the 5.0 we can do a better comparison.