02-17-2015, 08:16 PM | #155 |
extra what?
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Bullshit.
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02-17-2015, 08:18 PM | #156 | ||
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Keep in mind that the failure mode of a CF driveshaft is by far the BEST out of all the materials used. It effectively becomes a very large broom Quote:
The same reason they still put crossdrilled rotors on performance cars... |
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02-17-2015, 08:21 PM | #157 | |
Sweeper
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02-17-2015, 08:25 PM | #158 | |
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This was an aftermarket one, though.
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Because titanium. |
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02-17-2015, 08:31 PM | #159 |
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Also, 44 milliseconds at 100 mph is over 6 feet if my not NASA-level math is correct.
So can we do the fun math again for distance between cars at the end of an acceleration run? Then also braking? Then hard accelerating and hard braking many times over, say a road course?
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02-17-2015, 09:02 PM | #160 | |
Add lightness!
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I would regret buying a house in 2007 or hitting a kid with my car. Spending $400 on a well crafted, well thoughtout car part that I lovingly installed on my car to daydream about my .2 second improvement on HPDE day is just part of the hobby. This entire hobby is about setting money on fire. If you think otherwise, you are just deluding yourself. I laugh everytime I hear someone use the word "invest" when they talk about buying shit for their cars. Newsflash: Every aftermarket car part is a horrible use of money. |
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02-17-2015, 09:42 PM | #161 | |
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02-17-2015, 09:43 PM | #162 |
Is not fast.
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Industrial's so close. He almost has it.
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02-17-2015, 09:58 PM | #163 | |
Because compromise ®
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My car is completely stock except for all the mods.
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02-17-2015, 10:07 PM | #164 | |
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http://www.wallaceracing.com/drivesh...critical_speed
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02-17-2015, 10:16 PM | #165 | |
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I'm just absolutely, positively, metaphorically, dying to make a snarky yet scientifically correct comment about my superhuman ability to differentiate between 6 feet and zero without using a Sciencemaster Mathotron 9000.
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02-17-2015, 10:29 PM | #166 | |
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The articles notes that removing 15 pounds from a flywheel (where the weight is farther from the center point and the moment of inertia is higher than a driveshaft) can be expected to drop only .08 seconds from a straightaway where acceleration from 60-130mph occurs. While I try to extract as much performance out of the car at the track, .08 seconds is well within my margin of error on any single lap and the difference from 15 pounds off the driveshaft will be much less than .08 seconds since the moment of inertia is lower. Now granted, this is ignoring the cumulative effects of constant acceleration/deceleration that occur each lap that a lower MOI would have. However, it has been mathematically proven in this thread that the MOI delta between the stock and aluminum driveshafts is rather insignificant, so I don't expect the cumulative effects of an insignificant change to become very significant.
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02-17-2015, 10:48 PM | #167 |
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In the beginning, there was rain. The people thought the gods must've been angry so they sacrificed their kids as offerings and the rain stopped. Some people realized the offerings did SFA and told others to no avail, so the killing of their kids continues until they wipe themselves out.
The end.
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02-17-2015, 10:53 PM | #168 | |
Banned
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This simplification works for a perfect cylinder assuming a "thin" shell you dont have to "go all integral on it" but you will get better accuracy. It also was within a few percent of an online calculator: http://www.endmemo.com/physics/momentinertia.php and the link posted back a couple pages. 30 lbs driveshaft = 13.6 kg 3" dia (1.5” radius = 3.81 cm = .0381 m) = I = .0381 * .0381 * 13.6 = .01974 kg.m^2 |
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