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DISCUSSION => Suspension => Topic started by: Andy_Casey on July 16, 2010, 04:17:22 AM

Title: Spring Rates - 318is
Post by: Andy_Casey on July 16, 2010, 04:17:22 AM

I decided to do some research into spring rates as I was finding the car a little wallowy on the Eibach springs when driving in a 'spirited' manner :)

Anyway, I emailed the major spring manufacturers expecting little information to come my way but suprisingly I have received spring rate details (for the 318is / 4 cyl springs) from HnR, Eibach and Apex. Here it is:-

(@ 1 N/mm = 5.71 lb/in)

Apex 20-1020 (4 cylinder, -30mm)

Front - 29 N/mm = 166 lb/in
Rear - 52 N/mm = 297 lb/in

I was informed that the X Low kit (-60mm) is about the same stiffness, it just requires shortened shocks.

H&R 29663 (4 cylinder, -40mm):-

http://www.h-r.com/includes/download.php?file=../bin/29663.pdf

Front - 33 N/mm = 188 lb/in
Rear - 50 N/mm = 286 lb/in

Eibach Pro Kit E2003-240 (4 cylinder, -35mm)

http://performance-suspension.eibach.de/search/model/send_file_as_attachment/Model?aux=386462&field=abe_www

Front - 20 N/mm - 114 lb/in
Rear - 46 to 57 N/mm - 262 to 325 lb/in

I have bought some Apex springs to try but will be looking to develop my own springs in the near future :)

Title: Spring Rates - 318is
Post by: flyinglizard on July 16, 2010, 08:23:05 AM

Eibach usually dont list the rates. I never buy them because of that.
   H&r for street stuff , hyperco or Suspension springs for race cars. Cut the stock front  ones for the German cars. MM

Title: Spring Rates - 318is
Post by: carguy101 on August 04, 2010, 12:04:04 PM

Your links are broken :(

Title: Spring Rates - 318is
Post by: chapellej on September 24, 2010, 11:51:12 AM

meagan racing also make a good 318 spring i am using them in conjunction with my ground control coils.