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The BMW Range
5 Series
F10, F11, F07
Finally... is HERE!!
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<blockquote data-quote="manjohari" data-source="post: 560686" data-attributes="member: 23955"><p>err... to be franked, i fell much better on the handling and acceleration, except higher noise level <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p>i do believe weight playing important rule here...</p><p>most BMW rims are much heavier, style 351 M (19" @ 32lb/14.53kg), style 331 (19" @ 16.1kg)</p><p>compare to forgestar (19" @ 25lb/11.36kg with lighter non-RFT) and original 17" (17" @ 9.93kg with heavier RTF)</p><p></p><p>i guess below would give better explaination</p><p>Newton's 2nd law:</p><p>Force = mass*acceleration</p><p>Force = Weight*acceleration/gravity</p><p>Acceleration = F*gravity/Weight </p><p></p><p>So for the same force, heavier the rims, acceleration would be reduced.</p><p></p><p>Torque = r * Force</p><p>Acceleration = Torque/r * gravity/Weight</p><p></p><p>maybe for 520d the effect is not much with higer torque compare to 523i with slightly increase weight.</p><p></p><p>**Note: it's been long time i studied those, maybe i messed up somewhere hehe.... also u can't deny "placebo effect" which make me bias after spending much money</p></blockquote><p></p>
[QUOTE="manjohari, post: 560686, member: 23955"] err... to be franked, i fell much better on the handling and acceleration, except higher noise level :) i do believe weight playing important rule here... most BMW rims are much heavier, style 351 M (19" @ 32lb/14.53kg), style 331 (19" @ 16.1kg) compare to forgestar (19" @ 25lb/11.36kg with lighter non-RFT) and original 17" (17" @ 9.93kg with heavier RTF) i guess below would give better explaination Newton's 2nd law: Force = mass*acceleration Force = Weight*acceleration/gravity Acceleration = F*gravity/Weight So for the same force, heavier the rims, acceleration would be reduced. Torque = r * Force Acceleration = Torque/r * gravity/Weight maybe for 520d the effect is not much with higer torque compare to 523i with slightly increase weight. **Note: it's been long time i studied those, maybe i messed up somewhere hehe.... also u can't deny "placebo effect" which make me bias after spending much money [/QUOTE]
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