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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 05-09-2014, 05:51 PM   #1
alpinm3
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M3 spring rates.

Hi all, does anyone know what the spring rates are for a stock m3. I'm trying to calculate which rate I should get for lowering springs without revalving my shocks. (they are brand new)

Any suggestions toward a spring kit are welcome. I will be using them with OEM shocks.

Please don't reply saying "Get Coilovers," When I retire my car to the track I will make that transition.

I'm just trying to get rid of that hideous 4x4 gap that e46's come with.

Thanks!
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Old 05-09-2014, 07:10 PM   #2
Teslazerok
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Not sure how accurate this is however.

As for your shocks, the bigger concern is the height of the spring you choose, not the rate. Shocks burn through super quick when they no longer have the normal amount of travel.
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Old 05-10-2014, 08:50 AM   #3
SushiRoll
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I would keep the same spring rate. Just get springs with tighter windings and lower overall height.
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Old 05-12-2014, 12:14 PM   #4
Mahjik
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Quote:
Originally Posted by alpinm3 View Post
Any suggestions toward a spring kit are welcome. I will be using them with OEM shocks.
Take a look at the Eibach or H&R springs. Both will work with the OEM dampers and aid you in ridding the car of the 4x4 look. Neither will break the bank and will tide you over until you go to a full coilover. I've been using Eibach for about 5 or so years.

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I would keep the same spring rate. Just get springs with tighter windings and lower overall height.
That would just be bad. Less travel requires more spring rate to account for that lack of travel. Otherwise, the car will just be binding on the coils on larger dips on the road (providing a terrible ride and undesirable handling).
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Old 05-12-2014, 12:27 PM   #5
TrickTizzle
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I'm pretty sure the OEM spring is a dynamic variable spring, so the spring rate varies based on compression.

Are you looking for static spring rate recommendations?
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Old 05-12-2014, 01:07 PM   #6
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I'm pretty sure the OEM spring is a dynamic variable spring, so the spring rate varies based on compression.
H&R springs are progressive rate springs. Eibach will be linear (even though they typically advertise they have progressive rates).
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Old 05-13-2014, 01:50 PM   #7
Nelson
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Eibach Pro-Kit was designed to be used with factory shocks. I used them on my factory shocks for years until I decided to upgrade to Koni's.
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