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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > Heavier Coilover spring rates



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      10-09-2020, 02:38 PM   #1
e30h26
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Heavier Coilover spring rates

Hey folks,

Is there anyone on here with an E90 335 running BC BR Coilovovers with the 14k Front and 18K Rear springs, or anything heavier than the usual recommended off-the-shelf setups? Nothing from UK sellers keeps the 1:3 OEM Motion Ratio, and I'm thinking of changing my current springs to reduce the understeer I'm experiencing.
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      10-10-2020, 06:15 AM   #2
nomiS330d
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Iím nowhere near an expert but donít people mess about with anti roll bar (sway bar) stiffnesses for dialling out under or over steer? Might be easier and probably cheaper.
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      10-12-2020, 09:36 AM   #3
e30h26
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It's actually much cheaper and easier to swap the springs for the coilovers. However, where ARBs will help with roll but not have much effect on bump absorbing ability, changing to a much heavier spring will make a huge change to how it handles on B roads. I'm hoping someone will be running the heavier setup and willing to give an opinion.
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      10-14-2020, 05:56 AM   #4
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I did look previously at Swift Springs when I considered changing spring rates etc. They offer the best options.
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      10-15-2020, 12:51 PM   #5
e30h26
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I did see them on the Driftworks website Raj, thanks for the pointer anyway.

I'm looking for people already running heavier spring rates though, trying to gather some information on how the car behaves on B roads. I can find plenty of info from people in the US, but their back roads are a lot less "country" than the ones over this side of the world.
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      10-15-2020, 01:04 PM   #6
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You want to reduce understeer, how about making your front springs softer? Firmer springs are unlikely to be helpful on rougher roads
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      10-15-2020, 03:20 PM   #7
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Quote:
Originally Posted by e30h26 View Post
I did see them on the Driftworks website Raj, thanks for the pointer anyway.

I'm looking for people already running heavier spring rates though, trying to gather some information on how the car behaves on B roads. I can find plenty of info from people in the US, but their back roads are a lot less "country" than the ones over this side of the world.
Cool.

Best way to reduce under steer tbh is just fit a larger rear ARB. You can add softer front springs to again achieve what youíre after and will help improve the general ride.
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      10-15-2020, 04:53 PM   #8
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From your original post, do you really have 14kg/mm (=784lb/in) front springs?? If so, that's outrageous! Half that rate would be reasonable. Small wonder you're struggling for front end grip!
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      09-27-2022, 11:46 AM   #9
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To update this thread, currently running a 12k front and 20K rear spring setup. No serious loss in comfort, car reacts better turning in and less understeer, but I really need a new pair of rear tyres before pushing it hard enough to test the understeer issue properly.
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