lowering spring with B4 replacements?

ziazhp · 02-15-2024, 10:49 PM

Has anyone here paired either Eichbach or H&R with Bilstein B4s? I know B6s are a popular choice but I'm curious how B4s, which are OEM replacement fair.

maxwmiller · 02-23-2024, 10:47 AM

I wouldn't advise it, B4's with lowering springs is a recipe for issues due to the reduced length of travel. Best case scenario you'd have a poor quality ride.

Do you already have replacement B4 shocks? And if not, why wouldn't you get the B8's?

ziazhp · 02-25-2024, 10:03 AM

Are B8s even available? I only see B4 and B6 for e84s.

maxwmiller · 02-26-2024, 11:52 AM

My bad, B8's are not available specifically for the E84. (edit): There is a B12 kit available for the 2WD X1's.

If you could find an adapter sleeve for the front knuckle, you could run the E9X B8's, which would cost you $870 new (as of 2/26/24 from ECS Tuning). This is actually cheaper than the B6's for the E84, which are currently $940 on ECS's website.

To answer your first question, I know a friend who had H&R on his E84 with stock shocks, but it was just a commuter and I don't think he ever pushed it hard. I'm not sure what you use the X1 for, but I wouldn't want to risk busting my shocks or even have a concern about it. Also for the price of lowering springs + the B4 kit, you could just buy BC racing coilovers, which I am leaning towards for my suspension refresh.

ziazhp · 02-26-2024, 04:48 PM

This is my second E84, first one I did B4s with stocks springs. My current, I bought last fall with KW V3 set up and E90 camber plates and it's just too rough for the roads where I live. Great on highways but I mainly use this car around town, thus contemplating the switch to Eichbach and B4 or B6.

02-15-2024, 10:49 PM	#1
ziazhp New Member 4 Rep 20 Posts Drives: '88 M6, '14 x1 35i, '06 M Road Join Date: Dec 2016 Location: New Mexico iTrader: (0)	lowering spring with B4 replacements? Has anyone here paired either Eichbach or H&R with Bilstein B4s? I know B6s are a popular choice but I'm curious how B4s, which are OEM replacement fair.
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02-23-2024, 10:47 AM	#2
maxwmiller Private 8 Rep 63 Posts Drives: 2013 X1 xDrive2.8i Join Date: Dec 2022 Location: CA iTrader: (0)	I wouldn't advise it, B4's with lowering springs is a recipe for issues due to the reduced length of travel. Best case scenario you'd have a poor quality ride. Do you already have replacement B4 shocks? And if not, why wouldn't you get the B8's?
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02-25-2024, 10:03 AM	#3
ziazhp New Member 4 Rep 20 Posts Drives: '88 M6, '14 x1 35i, '06 M Road Join Date: Dec 2016 Location: New Mexico iTrader: (0)	Are B8s even available? I only see B4 and B6 for e84s.
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02-26-2024, 11:52 AM	#4
maxwmiller Private 8 Rep 63 Posts Drives: 2013 X1 xDrive2.8i Join Date: Dec 2022 Location: CA iTrader: (0)	My bad, B8's are not available specifically for the E84. (edit): There is a B12 kit available for the 2WD X1's. If you could find an adapter sleeve for the front knuckle, you could run the E9X B8's, which would cost you $870 new (as of 2/26/24 from ECS Tuning). This is actually cheaper than the B6's for the E84, which are currently $940 on ECS's website. To answer your first question, I know a friend who had H&R on his E84 with stock shocks, but it was just a commuter and I don't think he ever pushed it hard. I'm not sure what you use the X1 for, but I wouldn't want to risk busting my shocks or even have a concern about it. Also for the price of lowering springs + the B4 kit, you could just buy BC racing coilovers, which I am leaning towards for my suspension refresh. Last edited by maxwmiller; 02-27-2024 at 11:09 AM.. Reason: update for accuracy
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02-26-2024, 04:48 PM	#5
ziazhp New Member 4 Rep 20 Posts Drives: '88 M6, '14 x1 35i, '06 M Road Join Date: Dec 2016 Location: New Mexico iTrader: (0)	This is my second E84, first one I did B4s with stocks springs. My current, I bought last fall with KW V3 set up and E90 camber plates and it's just too rough for the roads where I live. Great on highways but I mainly use this car around town, thus contemplating the switch to Eichbach and B4 or B6.
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