If I were to cut a coil from my springs, would the final height be that much less? and as the spring rate increases with fewer coils, is it going to go up noticeably?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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Your question is a bit vague but I'll take a shot. Cutting coils is somewhat of a hack though it does sort of work. The biggest issue is reforming a factory coil end where you cut.

In theory, if your spring has 10 coils, and is rated at 1000 LB per inch of compression, removing one coil would result in a rate of 1100 LB per inch of compression.

How far the car drops depends on spring to wheel ratio, generally X change in spring _loaded height_ will result in a lesser change in ride height.

If one coil is cut and the resultant ride height reduction is X, cutting another coil will give a drop somewhat less than X.

Getting the proper ride height is time / labor consuming requiring maybe 1/2 coil cut reassembly, check ride height then remove and cut again. To pay someone to do this is expensive so you would probably want to do the in / out yourself.

A better choice may be to install " hidden " adjustable spring seats and universal springs, these can be gotten through oval track racing suppliers.

While searching craigslist I came across some looser that is offering $ 100 CASH!!!! to anyone that "knows what they are doing" to remove and cut 4 springs on their SL. $ 100 would barely be enough for swapping springs on one end of the car let alone both ends and making the cuts.