Stock f:r ratio is 1:1.
Ground Control like most companies sets their default rates a little front-stiff. For a lowered 240SX it seems to be the way to go... you want to keep the front end off the bumpstops and in the "sweet spot" of the travel. McPherson strut suspensions have a limited range of useful travel before the geometry gets wonky.
GC's off the shelf rates are pretty well chosen, I'd stick with them unless you want something softer. I wouldn't go harder on stock replacement type struts (Koni or KYB).
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