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Thread: Stock spring rates for the Mirage?

  1. #1
    Administrator Daox's Avatar
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    Stock spring rates for the Mirage?

    Does anyone have any info on what the stock spring rates are?

    I have zero information for the fronts.

    The rears are claimed to be:
    Early 2014: 118 lb / 2.1kg ???
    Mid 2014 - 2015: 168lb / 3.0kg
    2017: ???


    Quote Originally Posted by cyclopathic View Post
    I think the 2014 had 118lbs/in (unconfirmed) and they bumped it to 130 for 2015 (per Little Stan measurements)
    Quote Originally Posted by cyclopathic View Post
    OEM springs are straight rate you can measure it by looking at preload. Uncompressed springs are 12" and compressed 9", 390/3 = ~130lbs.



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        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 42.1 mpg (US) ... 17.9 km/L ... 5.6 L/100 km ... 50.6 mpg (Imp)


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    Administrator Daox's Avatar
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    Alright, found some more info. However, its only about the rear springs off a 2015.

    Quote Originally Posted by Littlestan View Post
    Attachment 5768

    Attachment 5769

    Attachment 5770

    Attachment 5771

    Alright! I was reminded that we had a mechanical scale stashed away in the basement that is
    accurate to within a half pound, and it worked wonderfully for this purpose.

    Using a motorcycle tie down and a couple chunks of plywood to stabilize, I was able to compress
    the Amazon (AD) rear spring at 1", 2" and 3" compressions. The rear OEM springs I was only able
    to compress 1" safely for reasons which will soon be clear. The first pic is at 2" compression,
    second pic is at 3" compression, third pic is the stock spring at 1" compression and the final pic is
    the test bed.

    Here's the test bed details...

    First, I measured the spring and the wood chunks for the weight to subtract from the measured
    compressed weight. For every stage of compression, I used a level (not pictured) to re-orient the
    top piece of wood so that a consistent measure could be taken from the aluminum ruler you can
    see standing upright at the back of the scale. It's not perfect, but it's pretty damn close.

    Here's the results:

    Amazon (AD) rear spring (-5lbs for weight of spring and wood)

    1" - 50lbs
    2" - 99lbs
    3" - 159lbs

    Stock OEM spring (-6lbs for weight of spring and wood)

    1" - 163lbs

    I think it should be pretty clear the rear springs are garbage at this point. I'm just uploading a
    short video to Youtube showing me hand compressing both springs that I'll post once it's done. The difference is huge and frankly, I'm not sure how these ever got OK'd to be produced. They should
    have stuck with a linear design.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 42.1 mpg (US) ... 17.9 km/L ... 5.6 L/100 km ... 50.6 mpg (Imp)


  3. #3
    Administrator Daox's Avatar
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    While this is interesting, it really is a little puzzling since a lot of the aftermarket springs seem to have softer rear spring rates:

    Suspension & brake aftermarket parts index


        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 42.1 mpg (US) ... 17.9 km/L ... 5.6 L/100 km ... 50.6 mpg (Imp)


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