02-16-2015, 04:48 PM | #85 |
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Use science to save noobs money = wanker.
Got it, people argue about stuff, gets proven wrong then say what an ass for proving them wrong.. Just can't win.
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02-16-2015, 04:57 PM | #86 |
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02-16-2015, 05:04 PM | #87 | |
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Yet everyone swore that it made a huge noticable performance gain. It doesn't.
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02-16-2015, 05:56 PM | #88 | |
Add lightness!
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There really is no real way to dumb down the physics here. It's complex. It should be enough to know that losing 10 pounds for $400 might be worth it as is. The fact that it's also rotational weight absolutely makes a positive impact. How can we quantify this? It's hard. It's hard to quantify how exactly a lot of things work but we can explain it qualitatively. Why does one person get to force his theoretical qualitative opinion down everyone's throat? That's fucking ridiculous. Go tell people that black taillight housings suck because your opinion as someone who doesn't own a black taillight is parroted by other car forum sheeple. This is a car hobby. None of it really makes sense. This is for fun. Someone in this thread is basically saying...based on articles he's read, he doesn't think we should feel what we are feeling. People can physically taste the difference between 2 identical liquids based on the label on the outside. We are that susceptible to our brain overriding our senses. If installing a driveshaft really does make someone feel their car is faster, who the fuck are you to say otherwise? |
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02-16-2015, 06:16 PM | #89 | |
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02-16-2015, 06:19 PM | #90 |
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I suspect the "noticeable difference" comes from more than just weight reduction. My guess is the lack of centre bearing and other things to control NVH built into the stock drive shaft make for a more direct feeling of power delivery.
I believe @stugray that the weight reduction will have a negligible effect on the car but @Dimman has a good point, it is not up to Stu how people spend their money and he should know that arguing with people on the internet is a waste of his intellect. Make your case and move on whether people believe it or not. The right people will read it and learn from it. This is a forum, I could start a thread about the sky being blue and someone somewhere would argue with me.
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02-16-2015, 07:15 PM | #91 | ||
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Landed on Saturn's moon, orbited Mars, orbiting Saturn, returned sample from a comet, returned a sample from the sun, landed on Mars (twice), punched a hole in a comet, Orbiting sun discovered 1000s of planets, 4X orbiting Earth now. So I believe that I am: a little older than a typical reddit kid, have a clue about "that physics shit", and know my way around mechanical modeling of complex systems. (one of my last jobs was to spend a million dollars modelling how a spring loaded mirror bounces off a hardstop in zero G). I am personally responsible for dynamics testing on BILLION dollar spacecraft. But I guess my kind isnt wanted here so I'll just fuck off then. |
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02-16-2015, 07:44 PM | #92 | |
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02-16-2015, 08:13 PM | #93 | |
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For a given torque, we get a different angular acceleration when mass is close to the axis of rotation than we get when it is farther away." This means that the drive shaft, that is a tube, has the mass at x distance away from the axis of rotation. The rotational quantity that describes the mass of the body and its distribution relative to the axis of rotation is called rotational inertia. (1) 2. The way he acts? He gets frustrated (and rightly so) that many people refuse to acknowledge math. 3. Actually if we're getting all technical on this; its rotational mass; not weight. Rotational Acceleration=∑τ = I α Torque is explained as t = r cross F rotational inertia is I=integral from [a,b] of r^2 dm work is described as w=dW/dtheta angular momentum is described as L=integral from [a,b] of dVr cross p(r)v now that we have that out of the way, the formula (from my textbook) of a rotating cylinder about an axis is I=(1/2)M(R^2+r^2). Where M is the mass. Mass is directly proportional to Inertia. "Unlike the mass, the rotational inertia of a body is not an intrinsic property of the body, but instead depends on the choice of axis of rotation. Just as the mass can be regarded as the property of a body that represents its resistance to linear acceleration, the rotational inertia represents the resistance of a body to angular acceleration." (pg. 175-176) 4. It's not theoretical opinion, when its math. 5. not based on "articles" he has read. It's based on math. Academia is about as far from "internet science" as you can get. work cited: Resnick, Robert, and David Halliday. "Rotational Dynamics." Physics. 5th ed. Vol. 1. New York: Wiley, 1992. 175, 176. Print.
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Last edited by cdrazic93; 02-16-2015 at 08:26 PM. |
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02-16-2015, 08:28 PM | #94 |
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02-16-2015, 08:39 PM | #95 | |
Add lightness!
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The difference in mass between a stock and aluminum driveshaft is imperceptible. That may even be true in a scientific study but in the real world with no controls, just knowing you installed such a component can cause you to feel a difference in your brain. The buttdyno effect. In this case however, all the math supports that losing mass on the driveshaft is beneficial anyway so...what are we really arguing here? Whether someone thinks it's worth it? People pay big money for stanced cars in this community. I think you guys are barking up the wrong tree. Perhaps you guys should go fight a battle worth fighting like HID retrofits on lifted 1990s trucks? |
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02-16-2015, 08:41 PM | #96 |
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my point is in blue.
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02-16-2015, 08:43 PM | #97 |
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If the argument is based on $/mod then that's opinion based. I am proving the math behind the facts.
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02-16-2015, 10:28 PM | #98 |
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I love the Internet. Everyone tries to "win" a discussion thread.
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