Subject	Physics: at 100 mph, the kinetic energy of the wheels
Posted by	zellamay on October 17, 2012 at 3:05 PM
	This message has been viewed 358 times.
In Reply To	You are failing to understand physics. posted by TriniTT on October 17, 2012 at 12:18 PM
Message	and tires is about 15% of the total kinetic energy of the car. If you change the wheel/tire weight from (example) 55 lbs to 52 lbs, and that 3 lbs comes off the wheel only (which means it comes off of a smaller radius) you will not change that 15% by much. So it seems that Antihero is more right in this argument. (((( I started with this post and did the math: [ http://www.physicsforums.com/showthread.php?t=279649 ] ))))
Follow Ups	Unsprung weight - ZiNnYc 08:07:13 10/17/12 also any comments on hybrid weight (n/m) - ZiNnYc 08:33:50 10/17/12 From my experience on bikes, lightweight wheels - michaell32 (FL) 09:12:32 10/17/12 Empirical data > Theory. - Antihero 09:13:45 10/17/12 This test is saying that - ZiNnYc 09:32:27 10/17/12 which is why I didn't claim it was faster. - Antihero 09:35:22 10/17/12 but this isnt too close to call, it did this consistently. - ZiNnYc 09:42:14 10/17/12 lol @ calling 13.6 pounds significant on a 3600+ pound car. - Antihero 10:09:20 10/17/12 ok, so lets extend that theory. - ZiNnYc 10:26:20 10/17/12 Already taken into account. - Antihero 10:37:27 10/17/12 So how about the inertia of the suspension? - ZiNnYc 10:41:49 10/17/12 Yes (n/m) - BigTDogg (MA) 10:51:55 10/17/12 you are still failing to see the big picture. - Antihero 11:01:20 10/17/12 Rotating. Mass. (n/m) - BigTDogg (MA) 11:25:36 10/17/12 and? (n/m) - Antihero 11:27:37 10/17/12 Roll a steel wheel up a hill, then roll a plastic one. (n/m) - BigTDogg (MA) 13:49:50 10/17/12 chaining the wheel to 3500 pounds of steel changes things (n/m) - Antihero 16:31:28 10/17/12 Okey Dokey I guess I'll return my lightweight flywheel, - Zvil 16:51:22 10/17/12 Not really, but I'm not one to yell at a wall (n/m) - BigTDogg (MA) 16:52:52 10/17/12 Point taken. (n/m) - TriniTT 22:05:54 10/17/12 You are failing to understand physics. - TriniTT 12:18:47 10/17/12 accelerating 3600 pounds forward is what your engine's doing - Antihero 13:53:20 10/17/12 Do me a favor and just try it. - TriniTT 22:20:55 10/17/12 2nd. It was a night and day difference between my curb - MixManMash 23:54:47 10/17/12 3rd, 17"Rpf1s w/r888s - TTZEDHEAD 07:07:48 10/18/12 Physics: at 100 mph, the kinetic energy of the wheels - zellamay 15:05:17 10/17/12 Or the other conclusion.. - Antihero 10:13:08 10/17/12 Don't get into it with Antihero, he doesn't understand - TriniTT 10:49:04 10/17/12 Actual heavy wheels like the 21 pound fn01RC's that won? - Antihero 11:06:01 10/17/12 I'm done arguing with you, you're speaking authoritatively - TriniTT 12:10:31 10/17/12 There's really two separate things going on here. - TheMarlin (MidTN) 12:43:22 10/17/12 Absolutely agree, great points there. (n/m) - TriniTT 13:02:03 10/17/12 Well, Rick is a pretty smart guy. - ZiNnYc 18:55:48 10/17/12 you seem to like the maths - BlackholeZ 17:14:53 10/18/12 My NA felt much more peppy when I switched to iForged 18's - KongZTT GT28RS MD 09:40:22 10/17/12 I believe the feel is a separate argument - Antihero 09:44:57 10/17/12 FWIW.. the car felt much quicker to get up from a stop (n/m) - KongZTT GT28RS MD 09:51:49 10/17/12 Grassroots racing mag found not benifit in laptimes... - Hipendicular 13:41:12 10/17/12 I found this on their website.. +1 sizing.. - Hipendicular 14:14:47 10/17/12 Good info. Thanks. (n/m) - Antihero 14:53:29 10/17/12 which issue? - fuzzymonkey 16:12:32 10/17/12 June 2011 is one. I know there was another as well, but - dogpile 16:47:20 10/17/12 Here's one scan from the mag.. - Hipendicular 17:31:46 10/17/12 Not to argue, but .09s in auto-x has been the difference - dogpile 17:44:29 10/17/12 But even GRR mag said it was not conclusive.. (n/m) - Hipendicular 12:40:29 10/18/12 Right, I agree. But saying .09 seconds in a competitive - dogpile 14:18:05 10/18/12 Tire weight made a bigger dif.. - Hipendicular 17:33:29 10/17/12 Wider tire was slower.. - Hipendicular 17:41:20 10/17/12 * tire size, not weight alone - dogpile 17:48:04 10/17/12 Scan part two - Hipendicular 17:35:04 10/17/12 Dyno results - Hipendicular 17:36:41 10/17/12 my neck hurts - fuzzymonkey 17:55:36 10/17/12 June 2011's Project MX5 article. (n/m) - dogpile 17:57:39 10/17/12 its funny how everyone goes on about wheel weight but noone - ztunerz 11:31:45 10/17/12 I was just reading some posts regarding tire weight the othe - Haasz32 11:47:48 10/17/12 I commented on tire weight as well. - TriniTT 12:12:16 10/17/12 yeah me too - toyo t1r were and contis are typically - ztunerz 12:16:50 10/17/12 For those concerned with weight: - Antihero 11:41:00 10/17/12 I agree with you, Rick, the people who actually have the - Jeffblue 12:50:31 10/17/12 Driver skill is a variable that, while important, - ZiNnYc 14:07:07 10/17/12 So basically you are just arguing to argue? - Antihero 14:22:59 10/17/12 Whos arguing? - ZiNnYc 14:30:55 10/17/12 The way I live is... - Antihero 14:51:53 10/17/12 yes, and then he's going to draw some sort of conclusion - Jeffblue 15:29:52 10/17/12 too late (n/m) - Jeffblue 15:30:42 10/17/12 very clever, albeit irrelevant response again. (n/m) - ZiNnYc 19:07:25 10/17/12 Thats reasonable. - ZiNnYc 14:28:27 10/17/12 Mod for a purpose. - Antihero 14:47:03 10/17/12 Agree. - ZiNnYc 15:25:14 10/17/12 When someone claims they bought heavier wheels/brakes/susp - Jeffblue 15:37:49 10/17/12 Jeffrey, this all started with me posing a question - ZiNnYc 19:11:09 10/17/12 Is there tension in NY (n/m) - ali300zx 12:14:51 10/18/12 AMEN! (n/m) - SimaYi 16:03:46 10/17/12 *popcorn* (n/m) - fuzzymonkey 14:45:29 10/17/12 Also would like to add something no one has brought up - TheMarlin (MidTN) 17:16:24 10/17/12 Thank you, ^^^^^this is nice and simple. (n/m) - TTZEDHEAD 19:29:31 10/17/12 so you are saying... - Antihero 20:36:13 10/17/12 Don't know what your problem is - TheMarlin (MidTN) 22:07:41 10/17/12 Face palm (n/m) - TTZEDHEAD 06:07:36 10/18/12 lacks industry backing - Adam (NoVA) 11:59:57 10/18/12 not to nitpick - ZiNnYc 19:45:24 10/17/12 and also this - ZiNnYc 19:51:59 10/17/12 sigh.... - Antihero 20:31:07 10/17/12 Weight isn't directly relevant to this part - TheMarlin (MidTN) 22:18:13 10/17/12 agreed.... but - Antihero 22:34:36 10/17/12 Right. Very rough math: an 18" wheel has to be 75% - zellamay 11:58:29 10/18/12 Can't compare flywheel weight to wheel weight, because - zellamay 11:47:29 10/18/12
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