Quote:
Originally Posted by blakkoutdarko
I’m running stock suspension but plan to get BC Racing coils (Extreme Low) with the swift spring upgrade and Rays Gram Lights 57DR 17x9 38+ with 245/240 Falken Azenis FK510. For the coils is 8k spring rate good or should I go higher/lower? I already know I might need extended lugs and spacers for the rear. Would dropping the car 1.5-2” be overkill and cause rubbing?
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Presumably you mean 245/40-17 tire size, yes?
That wheel size/offset will work fine with lowering springs. FWIW I've run 245/40-17 on 17x9 +35 and 17x9 +37 wheels, and also 235/40-17 on 17x9 +40 wheels, with ~1.25" lower Swift lowering springs and Bilstein B8s (B6s would be fine as well). Works great on street and at the track.
YOu don't need wheel spacers and you don't need rear lower control arms. You will want to get an alignment after lowering the car of course. You will probably also want to get some front front camber. I'm running Raceseng cascam plates. You might get by with offset upper front strut mounts (Pedders?).
Regarding spring rates, stock are in the neighborhood of 3kg/mm. Swift Sport and RCE Yellow springs are quite a bit stiffer, but nowhere near 8kg/mm. Either will work great with Bilstein B6 and give a firmer ride but nicer ride quality (less harsh) than stock.