V8's can be light. Aluminium block LSX w/ 6 speed trans is 12lbs LIGHTER than a KA24 w/5 speed in a 240sx.
I don't think Nissan wants a Z car that is too fast. Who would buy a $90K GTR when a $30-40 Z car could hang with it?
If Mazda and Toyota come out with a budget sports car that man handles the Z I think it might some some significant hp increase but until then I doubt it. The Z top of the line Z has always been in the 300ish hp neighborhood and will probably stay there. The next gen's base model may have 350hp like the nismo now but I wouldn't call that a dreastic increase.
I thought I heard about some legislation a while back that was going to change way the EPA tested for MPG so it would be more real world, and it was going to require a set MPG rating per model of car instead of by brand. The requirement would be set according to wheel base. Long wheel base trucks get lower standards than short wheel base cars. The example I heard was by the new rules the Corvette would have to get 34mpg.
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