Quote:
Originally Posted by John_01
I've never seen a progressive rate spring for 1 series cars. It seems the "L2" and "L3" coded spring is what's know as the "Linear" spring that was supposed to come out in the later cars. Back to 2006, the 1 series hatchback used springs coded as "D0" or "D1" for the M-sport spec model, which seems to be part of the same numbering system used on the 3 series cars.
The way I look at it, all the E82 and E90 suspension systems actually have progressive spring rates. They use a long polyurethane bump stop that engages a short distance into the bump travel. When combined with the linear springs it provides a overall progressive rate.
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The springs I have are L3 rears. These came off of a 2008 135i which is supposed to be a progressive spring. For what it's worth, I could see nothing in the coil spacing or thickness that would indicate any progressiveness.