voicey Posted March 7, 2011 Report Share Posted March 7, 2011 I've not come across this before but when searching for info on adjusting the ride height on my 360 I came across the term. Apparently my car has a Motion Ratio (MR) of 0.7. Am I right in thinking that this is the ratio of change in spring height compared to change in wheel height (and thus body height)? So if I wind down the coilover by 10mm the car height will go down by 14.3mm (10/0.7)? It would make sense as the coilover is mounted inboard of the hub on the wishbone so a small movement there will be exaggerated at the end. Quote Link to comment Share on other sites More sharing options...
Tony Posted March 7, 2011 Report Share Posted March 7, 2011 Reads like the dynamic index, a perfect index is 1.0 Quote Link to comment Share on other sites More sharing options...
CIH Posted March 7, 2011 Report Share Posted March 7, 2011 Can't say I'cve ever heard of the term. Corner weighting involves adjustig the coilover spring seats so balance the mass carried in each corner. Maybe something along those lines ? Quote Link to comment Share on other sites More sharing options...
hms Posted March 8, 2011 Report Share Posted March 8, 2011 Google is your fiend! http://www.proshocks.com/calcs/imotion.htm Not that I understand this! h Quote Link to comment Share on other sites More sharing options...
Tony Posted March 8, 2011 Report Share Posted March 8, 2011 Something for the designers methinks..... Quote Link to comment Share on other sites More sharing options...
voicey Posted March 8, 2011 Author Report Share Posted March 8, 2011 The way I read it is because the shock is mounted on the wishbone closer to the chassis than the hub is. Both are pivoting at the same point - a certain movement of the shock equates to a larger movement of the hub. It's like using a long bar to undo a stubbon nut - the end of the bar moves quite a bit but the actual nut barely turns as it is right at the pivot point. The problem is also compounded by the fact that the shock isn't mounted vertically. Quote Link to comment Share on other sites More sharing options...
voicey Posted March 8, 2011 Author Report Share Posted March 8, 2011 Here's a link to Wikipedia: http://en.wikipedia.org/wiki/Motion_ratio Quote Link to comment Share on other sites More sharing options...
Tony Posted March 8, 2011 Report Share Posted March 8, 2011 Interesting stuff but as said very much for the designers. Quote Link to comment Share on other sites More sharing options...
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