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Characterization of the OE Suspension Springs

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Characterization of the OE Suspension Springs

 
Old 10-06-2010, 11:56 AM
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Interesting, thanks! For some reason I never considered that those foam bits might be "active" components under moderate compression. That certainly throws (another) wrench in my suspension spreadsheet...
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Old 10-06-2010, 07:41 PM
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Originally Posted by INTJ,Oct 5 2010, 06:53 PM
The bump stop in the s2000 is definitely part of the spring rate. It is a convoluted foam that has a progressive spring rate that is active in most high rotation turns.
I was really surprised myself went I worked on my AP2. It is similar to VW with a continuously engaged bumpstop. The density is less than celasto (Koni) but is is really long. With the weight of the car down it is in almost in contact with the shock.
Do you or anyone else out there have any evidence as to how much they are really engaged? A zip tie on the shaft or something else? Linear position sensors, etc...
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Old 10-07-2010, 09:38 AM
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I took the dust cover off the stock and it sits just above the shock body.
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Old 11-13-2010, 06:14 PM
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Read the paper, fantastic!

I just wish I had found this post yesterday before I installed a set on one of my cars. I have gotten several sets of shocks and springs and not knowing which was originally front and back, I have been checking the spring rate and then trying to set the car up as close as possible to the commonly posted rates (based on how the springs measured), which according to this post are all dramatically off!!
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Old 11-13-2010, 07:55 PM
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Mods, sticky this. Good info.
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Old 11-13-2010, 11:16 PM
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jeallen, yes, direct measurements can be deceptive since it's difficult to account for the inactive coils. Thus, one goal of this paper was to provide parameterized models of each OE spring and swaybar, along with the appropriate equations to use.

Have you measured the bump stop foam?
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Old 11-14-2010, 06:06 AM
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No, sorry. Not sure how to approach the foam.
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Old 11-15-2010, 08:05 AM
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This is great - any chance you can add in the common aftermarket rates as well as comparisons?
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Old 11-15-2010, 10:51 AM
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Spring rates of aftermarket springs are usually stated directly by the manufacturer. Since Honda didn't ever really do so (except in the AAMA data sheet, reference [5] in the paper), the goal of this project was to add some clarity to the various OE spring rates, which should help folks calculate how much stiffer/softer their mods will be.
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Old 11-17-2010, 03:19 PM
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Bump. After a review of my calculations, made some *very* slight revisions which resulted in spring rates that match (even) better with Honda's published data. The largest magnitude of change was to the '08 rears (is 294, was 290) and the CR rears (is 343, was 339). All other changes were within a pound or two. Swaybars unchanged.

Revised summary table (also updated in previous posts):
Code:
               |  Front   Rear    |  Front    Rear
Model Year    |  Spring  Spring  |  Sway Bar Sway Bar
--------------+------------------+--------------------
2000-2001     |   219     291    |   393      427
2002-2003     |   246     309    |   300      396
2004-2005     |   262     278    |   300      311
2006-2007     |   262     269    |   300      311
2008-2009     |   280     294    |   354      311
2008-2009 CR  |   384     343    |   392      362

Note 1: All figures are in lb/in. Divide by 56 to get kg/mm.
Note 2: Edited 17Nov2010 with slight updates to spring rates per rev1 of paper.
Link to updated paper: click here. (Only p.5 is changed; image of p.5 in 1st post has been updated.)
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