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Old 01-03-2013, 05:34 PM
Elk Elk is offline
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Quote:
Originally Posted by Jamesonsviggen View Post
One of the bigger factor, besides the tires, besides the driver, LBs/HP. I read the article and the F30 335 had among the worst ratios of any car there(the Fiat Abarth was the worst off). Granted, the N55 may make 315-320hp and not 300, but it would not skew the figure much.

. . .

Even the V-6 Mustang, solid axle or not, 305hp(I know less tq) and at least 100lbs lighter than the F30 335 and then better equipped with tires and brakes...it's not surprising...it's physics-power/weight.
Power/weight makes a difference on acceleration, but of course has no impact on cornering or braking. In any event, for an extra $15,000 - $20,000 would not one expect an ultimate driving machine to be superior in both weight and power?

Based on power/weight, the V-6 Mustang and F30 are closely matched:
Mustang, 305HP and 3523 pounds.
F30 300HP and 3591 pounds.

However, assuming the commonly accepted 320 HP for the F30, the F30 enjoys a 11.22 lb/HP advantage over the Mustang's 11.55. The BMW also has a torque advantage, as you point out.

By this measure, the BMW should win - but instead gets clobbered.

Motor Trend has the V6 Mustang at 0-60 mph in 5.3 seconds, quarter mile in 13.9 seconds at 100.1 mph. (The best I have seen is 5.1 0-60)

The F30 is significantly faster in a straight line, it hits 60 mph in 4.8 seconds and the quarter mile in 13.4 seconds at 103.7 mph. (the best I have seen is 4.6 0-60, but lots more in the 5.0 range)

This is embarrassing. The F30 is quicker in a straight line, but is being beaten in the corners by the Ford.
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