Subject	Forget all these rules of thumb, the moment of inertia
Posted by	CaliguyPurdue on February 13, 2006 at 2:04 AM
	This message has been viewed 38 times.
In Reply To	How much will my acceleration be effected.... posted by scoTTinald (BC) on February 12, 2006 at 10:51 PM
Message	is all that matters, even if you gained no weight over stock, if the moment is higher, it takes more power to accelerate the wheel rotationally. If you move the outermost band of material in the wheel outward, in this case from a radius of 8" to 9", you will increase the moment proportional to the square of the radius if weight is conserved. (I=mr²) 8x8=64 and 9x9=81. Thats a 26 percent increase in moment. (neglecting the loss of tire sidewall) Meaning if you wasted X amount of power accelerating the wheel, now your using an additional quarter to spin the 18. Also remember that the power used to accelerate the wheel rotationally is a small fraction of the total load. On that note, i bought a heffer of a wheel, and it felt like I'd left the parking brake on. If I could do it all again, I'd pick the lightest wheel possible.
Follow Ups	How much will my acceleration be effected.... - scoTTinald (BC) 22:51:36 02/12/06 Re: How much will my acceleration be effected.... (n/m) - 604Z 22:57:16 02/12/06 unless your talking tenths of a second at the strip, your - SnowManZ(aka Snowie) 23:00:21 02/12/06 Nice choice - Ebola (Calgary, AB) 23:02:46 02/12/06 PS: Im hoping I'll get to see them mid July in Kelowna. - Ebola (Calgary, AB) 23:11:33 02/12/06 As I am looking to see those GT-C's of yours :-) (n/m) - scoTTinald (BC) 23:39:47 02/12/06 blurry yet great (In My Perception) pic leaving Kelowna - Zlicious (Seattle) 04:47:14 02/13/06 Re: How much will my acceleration be effected.... - 604Z 23:07:40 02/12/06 There are a few good shops in Van city... - scoTTinald (BC) 23:41:43 02/12/06 It depends on what the wheel weighs.... - Player 23:13:32 02/12/06 every 5 lbs. is 1 tenth off your 0-60. - jmw23712 23:19:08 02/12/06 can this be confirmed? it sounds BS to me. - SnowManZ(aka Snowie) 23:52:48 02/12/06 I think he's talking about 5lbs off the wheels. - DMoneyTT (formerly 90na) 23:56:15 02/12/06 when I go back and read it I think it is off the wheels - SnowManZ(aka Snowie) 00:00:35 02/13/06 yes, that is 5 lbs on the wheels. - jmw23712 00:47:59 02/13/06 Yeah that makes a lot more sense =) (n/m) - SeedyROM 01:39:33 02/13/06 It's 100lbs for .1 off your quarter-mile - SeedyROM 00:02:40 02/13/06 I do not notice them slowing me down, instead I feel them - CHUNG (Dallas) 23:19:17 02/12/06 what kind of tires were you using on the stockers? - scoTTinald (BC) 23:49:09 02/12/06 eek (n/m) - Guapo 23:55:52 02/12/06 Yeah, I tend to drive like my Grandma... (n/m) - scoTTinald (BC) 00:01:55 02/13/06 Falken FK451, Ventus K104, Kumho 711/712, Dunlop SP8000 - CHUNG (Dallas) 00:03:20 02/13/06 Uh Huh :( do you have an auto? - DMoneyTT (formerly 90na) 00:04:38 02/13/06 no, shes a 5 speed. - scoTTinald (BC) 00:13:15 02/13/06 you wont even notice...after stage 3 its impossbile to - TWINTURBONICK 23:21:18 02/12/06 I noticed the difference in handling more than the - robo (sebring1970) 23:22:30 02/12/06 "Yokohama AVS ES 100's" :) (n/m) - Guapo 23:23:59 02/12/06 for better or worse, they were a constant in the formula (n/m) - robo (sebring1970) 23:38:28 02/12/06 well hell ... so they're inconsistent too? :) (n/m) - Guapo 23:56:21 02/12/06 having run through about eight of them I will share with - robo (sebring1970) 03:42:32 02/13/06 +40 in the front? Sounds like a lot to me... (n/m) - Scotts94z32 23:24:32 02/12/06 what would you recommend then? :-) (n/m) - scoTTinald (BC) 23:38:52 02/12/06 +37 front for 8.5", +41 rear for 10". Plus/minus 2. (n/m) - Scotts94z32 09:57:19 02/13/06 +43 rear for 10", IMO (n/m) - BigTDogg (MA) 10:11:56 02/13/06 *Update* - scoTTinald (BC) 00:00:12 02/13/06 Why are you guessing on the offsets? - NytWolf 00:12:19 02/13/06 Not guessing...TwinTurboNick said that those are his offsets - scoTTinald (BC) 00:16:28 02/13/06 here, all the offsets available for F/R: - CHUNG (Dallas) 00:44:05 02/13/06 Damn TTNick..haha - scoTTinald (BC) 03:13:32 02/13/06 I run a +33 in the front on 18x8.5's w/o issue - BigTDogg (MA) 13:58:18 02/13/06 Forget all these rules of thumb, the moment of inertia - CaliguyPurdue 02:04:06 02/13/06
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