Quote:
Originally Posted by BMR Suspension
It isn't a "helper" spring in the sense of helpers in coil-over set-ups. These are dead coils simply there to add free height to keep the spring seated. We did not advertise these as linear springs, but they have a linear working rate. What this means is when the car is at ride height and travels through its normal range of motion, it only used the one linear working rate of 640 lb/in.
I am not trying to be a jerk in any way so please don't take this the wrong way, but I think you are missing what I'm saying or twisting it around a bit. BMR's old springs are a dual-rate design, not progressive, solely based on the fact that it only uses one rate through the cars entire range of motion. This is completely by design and it's based on the load rating of the spring. If the load rating of the spring was different and the transition of one rate to another happened in the suspension range of motion it would fall into the definition of "progressive" in the article you gave the link to. Does that make sense?
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It is not my intention to twist anything that you say. It is my intention to inform and educate if possible, if not, it's my intention to be educated, lol. Do you happen to have a picture of your old dual rates installed?
What you seem to be saying is that the car will compress the 340 rate spring while sitting idle, coil over speak or not, this is essentially an integrated helper or "tender" spring designed to keep the spring from moving when the suspension is unloading from what you have described.
If that is not how the 340/lb section is being utilized and instead the 340 section is not completely compressed during static ride height, they're essentially a stepped rate progressive spring.
While I know we can all agree that the original springs were not a truly progressive spring, dual rate springs are largely grouped into the "progressive" category by the majority of manufactures.
Just trying to clarify.... as they say, a picture is worth a thousand words, or in this case, maybe a few thousand already, lol.