Subject	...
Posted by	aliaZ on March 09, 2008 at 3:49 AM
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In Reply To	please show your data (n/m) posted by Guapo on March 08, 2008 at 11:00 PM
Message	torsion spring rate equation: k = (G)(pi)(od^4-id^4)/32L, Where G = Modulus of rigidity od = outer diamter id = inner diameter L = length I don't know the id of the OEM bar, so for comparative purposes I'll assume a 3mm wall thickness for an id of 20mm. od = 26mm The ST bar is solid, so the id is zero. od = 21mm Both bars are steel, so G remains constant. The length is the same since the geometry of the 2 bars is the same. The ratio of spring rates between ST and OEM is then only dependent on the bar diameter and can be calculated as follows: k(OEM)/k(ST) = (od^4 - id^4)/(od^4) = (26^4 - 20^4)/21^4 = 1.52 The OEM bar is 52% stiffer than the ST bar assuming an id of 20mm. Parity isn't reached until the id of the OEM bar reaches 23.62mm Small changes in bar diameter result in large changes in spring rate since it varies as the fourth power
Follow Ups	For those that track: sway bars? - Twindragon 17:49:41 03/07/08 are the stabilizer links/endlinks that important to buy? - Alan(NJ) 17:59:30 03/07/08 Some copy-paste for you - Broke_as_**** 19:15:21 03/07/08 I would in no way doubt that Dr Kuah knows what he's talking - Guapo 18:14:27 03/07/08 ahem....profile check....*acts smug* (n/m) - LJZTT 18:41:53 03/07/08 you're still wrong (n/m) - Guapo 19:52:47 03/07/08 h8r (n/m) - LJZTT 19:54:35 03/07/08 4lyf (n/m) - Guapo 19:57:24 03/07/08 Speaking of are you going to track your Z - 300twinz (satx) 21:14:09 03/07/08 does the pope wear a funny hat? (n/m) - zgene4 21:21:13 03/07/08 Actually he was MIA at the track in 07. (n/m) - 300twinz (satx) 21:34:46 03/07/08 thought he lived his life 1/4 mile at a time leading me to - zgene4 21:45:10 03/07/08 I doubt I'll see serious track time until the little ones - Guapo 21:58:41 03/07/08 I can certainly understand that. (n/m) - 300twinz (satx) 23:38:24 03/07/08 I removed my Suspension Tech Swaybars last month .... - Gordo 93TT Daytona 20:49:01 03/07/08 Two questions - Twindragon 21:48:30 03/07/08 No I do not track the car. But yes, there is a noticable - Gordo 93TT Daytona 23:10:39 03/07/08 Re: Two questions - got rice? 19:53:35 03/08/08 Agree 100% - TriniTT 21:55:41 03/07/08 hmm, interesting, thanks for the input (n/m) - LJZTT 22:52:14 03/07/08 That pic has them installed in the softest setting too - spicyZ 08:21:55 03/08/08 Yes, the center setting reduces the angle. I ran the - Gordo 93TT Daytona 10:19:33 03/08/08 So long story short, nobody makes hollow sway bars - ENVYMYZ 09:04:14 03/08/08 I think the front ST bars are hollow, but they are also - Gordo 93TT Daytona 10:21:47 03/08/08 the rear OEM TT sway bar is stiffer than the ST bar - aliaZ 17:13:00 03/08/08 Are you sure? That will surprise many people, including - Gordo 93TT Daytona 21:44:30 03/08/08 torsional spring rate is more dependent on the OD than - aliaZ 23:24:52 03/08/08 please show your data (n/m) - Guapo 23:00:26 03/08/08 ... - aliaZ 03:49:30 03/09/08 pwn3d (n/m) - ENVYMYZ 09:27:15 03/09/08 Yes, that is nice math. Please show your testing data. - Guapo 10:46:27 03/09/08 Do you know for a fact that TT bars are stiffer, or are you - Gordo 93TT Daytona 13:06:33 03/09/08 Kuah actually tested it, but for some reason no one believes - aliaZ 13:20:54 03/09/08 all you can do is throw your hands up. - SuparexTT 14:24:44 03/09/08 The all the additional stiffness in the ST bar setup comes - Gordo 93TT Daytona 14:54:47 03/09/08 also... - aliaZ 13:23:45 03/09/08 Don't know about the track, but my stillen sways give - Piranha(AZ) 22:30:21 03/07/08 Experience with other cars - lazer(AK) 04:25:27 03/08/08 Changed yes, but for the better or worse? (n/m) - Mike(La Canada) 00:50:14 03/09/08
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