Factory spring rates for the Z4M

thielepr · 02-21-2021, 10:38 AM

Does anyone knows what’s the factory spring rates for the Z4M roadster? Normally that info is easy to find but I can’t find it any where

maupineda · 02-21-2021, 04:37 PM

If you search you will find the info here, from memory, fronts are 190-220, and rears are ~440.

thielepr · 02-26-2021, 07:13 PM

That’s quite a difference between front and back

maupineda · 02-27-2021, 06:23 AM

Quote:

Originally Posted by thielepr

That’s quite a difference between front and back

Is due to the rear suspension design which places the spring midway the control arm effectively increasing the lever arm. As is it is very balanced in terms of ride frequencies.

You need a bit higher frequency at the rear to equalize the suspension motion as car goes over bumps, the rear wheels need to catch up with the fronts.

02-21-2021, 10:38 AM	#1
thielepr Private First Class 21 Rep 110 Posts Drives: 06 Z4M, 11 M3, 17 230i Join Date: Nov 2015 Location: Greenville, SC iTrader: (0)	Factory spring rates for the Z4M Does anyone knows what’s the factory spring rates for the Z4M roadster? Normally that info is easy to find but I can’t find it any where
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02-21-2021, 04:37 PM	#2
maupineda Captain 456 Rep 975 Posts Drives: E86 Z4MC Join Date: Jul 2012 Location: Detroit, MI iTrader: (3)	If you search you will find the info here, from memory, fronts are 190-220, and rears are ~440.
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02-26-2021, 07:13 PM	#3
thielepr Private First Class 21 Rep 110 Posts Drives: 06 Z4M, 11 M3, 17 230i Join Date: Nov 2015 Location: Greenville, SC iTrader: (0)	That’s quite a difference between front and back
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