Quote:
Originally Posted by MeisterR
Motion ratio is the calculation how the springs rate reach the wheel.
You use it to give you an idea of what the "wheel" actually see.
There are other parts, but I'll throw up some simple number.
Some cars have low motion ratio, so the front of a Toyota Supra I think run about a 0.6 to 1.
So that mean if you put a 10kg/mm springs on, the wheel only see 6kg/mm
Some car have high motion ratio, the rear of a new Miata have a 0.9 motion ratio.
So that mean if you put a 10kg/mm springs on it, the wheel actually see 9kg/mm
What that mean is you can put 12kg/mm on a Supra and a 10kg/mm springs on a Miata; and the Supra is actually using the "softer" springs even though the springs is harder than the Miata.
Suspension motion ratio difference is one reason why you cannot use springs rate from different platform to compare.
Just because X car is using 10/8 and it is good, it doesn't mean Y car that is similar in size and weight can use 10/8 and achieve the same effect.
Jerrick
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Sorry, I worded my question poorly.
I meant how is it that 5/5 hits harmonic given the difference in effective spring rates.