Appropriate Spring/Spring Rates + BMW PS Retrofit

hyphy1 · 06-06-2015, 10:53 PM

Curious, what is the best springs/spring rates that would complement the bmw performance retrofit?

Im leaning toward dinan or swift springs. Spring rate numbers would be nice. Also plan on reinforcing the subframe bushings for overall street performance.

John_01 · 06-07-2015, 12:14 AM

IMO, you would be better off to use Koni Yellow dampers instead of the BMW PS. Since they are adjustable, the Konis will be better suited to whatever springs you end up choosing. I used to have the BMW PS kit on my car. Although it works well for daily driving the BMW PS dampers aren't particularly firm. I found the Koni yellow at 50% setting to be noticeably more rebound control than the BMW PS and only a minimal difference in ride quality. If you want to get springs with higher rates the PS dampers will probably be out of the optimum range.

_Ryan_ · 06-07-2015, 10:35 AM

400/700 with quality dampers
*standard bucket of assumptions.

06-06-2015, 10:53 PM	#1
hyphy1 Second Lieutenant 26 Rep 274 Posts Drives: 2010 135i Join Date: May 2012 Location: California iTrader: (0)	Appropriate Spring/Spring Rates + BMW PS Retrofit Curious, what is the best springs/spring rates that would complement the bmw performance retrofit? Im leaning toward dinan or swift springs. Spring rate numbers would be nice. Also plan on reinforcing the subframe bushings for overall street performance. __________________ 2010 135i N54 Black/Black For Sale!
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06-07-2015, 12:14 AM	#2
John_01 Colonel 232 Rep 2,643 Posts Drives: E90 325i, E82 135i Join Date: Mar 2009 Location: Sydney, Australia iTrader: (0)	IMO, you would be better off to use Koni Yellow dampers instead of the BMW PS. Since they are adjustable, the Konis will be better suited to whatever springs you end up choosing. I used to have the BMW PS kit on my car. Although it works well for daily driving the BMW PS dampers aren't particularly firm. I found the Koni yellow at 50% setting to be noticeably more rebound control than the BMW PS and only a minimal difference in ride quality. If you want to get springs with higher rates the PS dampers will probably be out of the optimum range. Last edited by John_01; 06-07-2015 at 02:39 AM..
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06-07-2015, 10:35 AM	#3
_Ryan_ Captain 59 Rep 741 Posts Drives: E87 130i Join Date: Jan 2012 Location: Melbourne, AU iTrader: (0) Garage List 2005 BMW 130i [5.24]	400/700 with quality dampers *standard bucket of assumptions.
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