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Originally Posted by cvc 22349a
I didn't mean increasing the front spring rate x3; just tripling the rear rate from the front as BMW has w/the 135, 335, e9X M3.
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I gotcha, it was just coincidence I chose those numbers.
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Examples of doubling the rear spring rate from the front instead of triplling it can include KW's street comfort c/o 286 lb F/573 lb R or HPA's c/o kits with 336 lb F/672 lb R.
In trying to make sense of what 'Orb' has written; if the rear spring rate isn't tripled from the front, will it further promote understeer and the car won't settle at the same time front to back when going over a bump?
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Right. The settling behavior could be "fixed" with shocks, but my understanding is that would cause other problems.
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In the second example, wouldn't a 224 lb F/ 672 lb R spring set up be more congruent with the way the car was engineered?
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Yes.
The 336/672 setup does two things: it messes up the nice flat ride you get with BMW's rates, and, it causes understeer (unless that's corrected somehow). The flat ride is not important for racing though.