Quote:
Originally Posted by johan
10 Kilogram/millimeter = 559.974147 pound force/inch
So, actually the swift springs are not exactly 10k.
557 pound force/inch = 9.946888 Kilogram/millimeter
Yes, it's borderline pedantry to argue about, but one could assert that if they wanted to claim it was "exact", it'd be within 1 pound force/inch... So 559 or 560, certainly not 557.
Honestly, with a spring, I'd be more concerned about the standard deviation. And that speaks to earlier posts in this thread about testing a bunch of Sprint's springs. They certainly are not all exactly the same, that is statistically impossible given metallurgical and manufacturing variance. With a test across several springs of the same spec, we could establish if the STD is within a reasonable % - and that would speak to the overall quality of Swift in some objective manner.
The same test should be done with Taiwan brand x and y. Then we can compare STD across brands for an even more informed opinion.
If you wanted to extend the test, you'd also include some simulated mileage on a dyno and then retest to see how stable the metallurgy of the springs is: 1) how much has their rate changed over time 2) what is the STD on that change across springs.
Could be very fascinating and revealing data.
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The funny thing is, right after I took that picture, the value changed up to 558lb's! lol. It was fluctuating between 557 and 558, but it was only 1-2lbs, so I decided to just leave it.
We have thousands of springs sitting here on our shelf, so yes, we will be testing various brands, rates, as well as ones that have varying degrees of mileage. Infact, testing on a new spring isn't really the best judge of the quality of a spring, as both springs in this simple test that I done actually fell within Swift's own 3% variation (Eibach's is 5%). What will determine the quality is what each spring will be like after say 6 months, 12 months etc. That is coming
Regarding the generic Taiwan spring, not a lot of people realise this, but there is actually only 1 spring factory in Taiwan that supplies the entire aftermarket coilover market in Taiwan. Well, that's a lie, there are a couple more but quantities are so small it's insignificant. All the established brands go through the same factory for springs (whether it's BC, D2, STD, Yellow etc) So whether you purchase from a trading company or even another "spring factory", the generic coilover spring is going to be from the same initial source.