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Just installed some swift springs for my sedan last night and was wondering how long does it take for them to settle?
5-7 days is typical time to wait for an alignment. Be careful driving until you get it aligned, springs will still settle just fine even if you don't drive it much.
It's kind of a general rule to wait several days but YMMV, coilovers don't settle too much, my coils only moved about 1/8" initially and didn't settle any more after a few hours. My springs kept settling a little at a time for the first 4 days and didn't budge after that. I think my springs started about 1/2" higher than where they eventually settled.
If you can safely wait a few days then I would go that route, or if you must get an alignment right away I'd measure your spring height at the fender and if it settles more than 1/4" I'd get the alignment checked again.
I'm in the same boat. Installed my Swifts Saturday and all tho Swift says no need to wait with there springs I'm waiting until Friday to get it aligned.
No don't switch to taller sidewalls, you really need to keep your diameter close to OEM size, the 275/30/20s are the proper diameter for that 275 width, going to a 40 or 50 would bring all sorts of issues to your traction control, ABS, and your speedometer would be way off. Post a pic of your whole car for a better reference if you don't mind.
Blnewt is correct. You need to stay with the 275/30/20 as it's close to OEM. Measure with a yard stick from ground to the top of the wheel well. You should be at or around 27" for front and back. If not, you may have had the springs installed incorrectly.