Unsprung weight physics

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01-17-2008, 04:44 PM

#21

gothchick

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Quote:

Originally Posted by Q45tech

As wheel/tires/rotors have gotten heavier the engineers have been forced to more and more aluminum suspension parts and arms to try to minimize upsprung.......even the wheels are weaker and don't last [bend] for 15 years unlike earlier versions.

I found it interesting that a few of the higher performance Jaguar models have their rotors closer to the frame than the suspension pivot points to reduce unsprung weight...

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02-11-2008, 05:55 PM

#22

35Z

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I believe 1.0 lbs. of "unsprung" weight is equal to 1.4 lbs of "sprung" weight. 1960 vintage Jaguar XKE's rear brake rotor/calipers were mounted inboard for improved unsprung weight... A much sought after T-bucket hot rod mod!

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02-11-2008, 07:59 PM

#23

Justin07Z

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Quote:

Originally Posted by 35Z

1.4 cannot be right, I'v heard closer to 3-4 equivalent. And that makes sense, because if u drop 5 lbs per corner via lightweight wheels, thats 20lbs total. And if you take 20x1.4, that isn't an amount that could be felt if taken out of the car, yet in the real world, it can be felt in driving. 5lbs per corner is a lot.