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Old 03-24-2014, 03:45 PM   #1
comova
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Question Springs: 2 replace or not 2 replace = ?

I am "rejuvenating" my suspension and was wondering how can I tell (diagnose) if my springs needs replacing? Do they those their "springy-ness"? I am on a budget and rather not spend money I don't have on something that is still good.

My 1st DIY was (last weekend's) rear lower control arm replacement, both. The right side broke completely off, & the left was a little tweaked.

2nd DIY: I am replacing my rear shocks this weekend and then ordering parts for front struts $500 in parts (ouch!)

3rd will probably be some combination of bushings as they all are beyond past due. But front control arm for sure.

I am on a budget. Car has 138k miles. I would love to keep working on it but the price tag seems to be skyrocketing the older it gets.

ALL advice is welcomed.
Cheers! ~CV
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Old 03-24-2014, 03:48 PM   #2
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Really no need to unless they're broken, or the car has 200k.
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Old 03-24-2014, 04:03 PM   #3
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It's the springs that hold the car at it's height. Bentley manual page 300-21 has all the measurements to see if your car is sitting at spec, as measured from the fender lip to the bottom of the wheel rim. If you find much difference from stock, and assume you don't have a user lowered suspension already, then replace the spring(s). You can buy single replacement springs from BMW.

In front, with 16" tires and standard suspension, it's 589mm or 23.19 in. With sport suspension, it's 574mm or 22.59". If 17" rims and standard suspension it's 604mm or 23.77 in. With sports suspension it's 589mm or 23.19 inch.

In the rear, 16" rims with standard suspension is 555mm or 21.85 in and sport suspension 539mm or 21.22 inch. With 17" rims and standard suspension it's 570mm or 22.44 inch and sports suspension is 554mm or 21.81 inch.
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Old 03-24-2014, 04:08 PM   #4
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I'd say inspect the springs carefully, and reuse them if there are no visible cracks/flaws/ corrosion. If it's a Left Coast car, corrosion is probably not an issue.
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Old 03-24-2014, 04:46 PM   #5
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not 2
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Old 03-24-2014, 05:14 PM   #6
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Springs sometimes break, but otherwise they don't wear out in any meaningful time frame and shouldn't need replacing.
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Old 03-24-2014, 06:02 PM   #7
comova
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Thanks a ton fellow DIYers!
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Old 03-24-2014, 06:22 PM   #8
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So my springs aren't circular at the base, they're sort of square and hanging off the edge of the strut mount. If they're strangely bent - they need replacing?
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Old 03-24-2014, 06:31 PM   #9
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all 4
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Quote:
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I am going to install M3 fender grill on my 323ci.
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IMO, the euro clear corners looks too aftermarket/ricey.
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This 323 would most likely handle and drive better than a stock e46 m3.
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