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....Stock numbers were 133 ft. lbs for the Z3, 114 for the Miata. That's a fairly large difference adn the best "apples to apples" comparison we have before we start arguing about whether particular numbers come from a dynojet or a pack, or arguing about levels of prep for the motor, etc. Stock, the Z3 has a definite torque advantage over the Miata.
But I'm just pointing this out to highlight the fact that you can nit pick any classification you want. I can make plenty of arguments that the Z3 is heavy and others can argue it is light (decent aero with top, great brakes, good torque, the trailer arm suspension is not the disadvantage that people claim -- hell, it came off the E30 M3)....
Given the numbers I've seen for the Z3, the 240SX, the Integra and the NX2000, it looks to me that the Z3 is within the 100 lb ballpark where (to me anyway) it really comes down to driver and car prep that makes the difference.
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And what do we do for a car that doesn't make those precient predictions?? After Rob sunk the money for a pro build and he's only getting 3ft-lbs more torque, that winds up being a 2.2554% gain. How about on track performance to say when a car doesn't fit the curve. How about a lap at NHIS? that's right Andy Lapped Rob there, pretty good for a handeling car at a power car track. On to the other extreme LRP Rob was down 3 seccond on his best lap from Andy and finished 8.5 seconds back.