Quote:
Originally Posted by bruce.augenstein@comcast.
At a guess, the new GT500 will likely be turning trap speeds in the 125-126 mph range, given decent traction, but with traction control off. This estimate is based on an ancient (but tried and true) formula for estimating horsepower based on quarter mile trap speeds.
Take the trap speed, divide it by the constant 234, cube the result, and multiply that figure by car weight with driver. The result is a reasonable horsepower estimate. As an example, Car & Driver ran a ZL-1 Camaro to a trap speed of 119 mph, so assuming a 4300 pound curb weight with driver (4120 empty), we get:
119/234 = .508547, times .508547, times .508547 = .1315, times 4300 = 565 HP. Close enough to the rated 580.
Doing the same thing with the Mustang at 4100 pounds, trapping at 126 mph, one gets a result of 625 HP. Again, close enough.
ET? A goal for front-engine, rear-wheel-drive street cars on stock rubber is that ET times mph should equal about 1400 or so, or as close as you can get. This is easy with low-powered cars, but gets tougher as power goes up. Using this as a guideline, the new Mustang could likely be in the very low 11s in the quarter mile.
Doubt it, though. Consider the ZL-1 at 12.3 @ 119 mph. That product is about 1464, so assuming the Mustang could hook up as well as the Camaro, 126 mph gets you in the mid 11s.
With well-warmed slicks? High 10s, I think.
Bruce
PS - Its not as if the goal of ET times mph equaling 1400 is unobtainable in higher powered street cars, though. I have watched a stock ZR-1 Vette go 10.75 at 130 mph at a carefully sprayed drag strip on a perfect day, so it's possible. Of course, the Vette has better weight distribution, and extremely aggressive street meats on it right from the factory.
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