Quote:
Originally Posted by WhiteOne
If I replace my stock front springs with custom made 210lb/in. springs will it improve the balance of my otherwise stock 135i?
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Personally I wouldn't go changing spring rate unless I was going to change the dampers as well (since the spring & damper are supposed to work together in harmony, and they have a big affect on the behavior of the car). If you change only the spring rate, then the damper rate is not matched up properly and things get weird.
Also, I would guess that 210lbs/in is softer than the stock spring rate. It's definitely too soft for any kind of 'sporty' application.
If you *have* to do only springs, I'd go with something that's been pre-tested like an H&R spring kit. At least then you know they won't bottom out / coil bind / be way too soft / be way too stiff.