Thread: Has anyone calculated or measured the actual DNA Motorsport spring rates?

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  1. #1 Has anyone calculated or measured the actual DNA Motorsport spring rates? 
    SE Level Member CadVetteStang's Avatar
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    I have seen various applications advertised as 450 front / 250 rear as well as the same drop. This is across the board with W-body, Mustangs and Camaros. I find it hard to believe that they all have the same rate and drop....Has anyone calculated or measured the actual DNA Motorsport spring rates for W-body cars the actual drop?
    Autocross racer & suspension builder.
    Bulder & former owner: "Shelter" movie Mustangs.
    Wife's: 2004 Grand Prix GT (DD)
    Mine: 2002 Eldorado Sport Coupe (autocross & DD)
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  2. #2 Re: Has anyone calculated or measured the actual DNA Motorsport spring rates? 
    SE Level Member CadVetteStang's Avatar
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    Okay, the set I ordered has arrived. I calculated the front springs:
    I measured 11.25" free length. .555" coil diameter, 4.275" inner diameter, 5.47" outer diameter, 4.875" mean diameter, and 3.2 active coils.
    I used several different online calculators and played with the active coil number using 3", 3.2" and 3.25" .
    The results ranged from 351 lbs. - 383 lbs.
    I'm pretty sure that 3.2 is the correct number of active coils: in which case, the springs are between 355 and 360 lbs. Per inch.

    When I started building the car, my goal was 350- 400 front spring rate.
    I know they are cheap springs but I have read good reviews from people who actually have them on their cars.

    The 97 Thunderbird IRS springs i cut down to size became way too stiff by the time i got the nose of the car out of the air and the last cut made them too short and I trashed my upper strut bearings. I needed something fast and cheap to get me back on the road. If they don't work out for the long term, so be it. I need something for now.
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  3. #3 Re: Has anyone calculated or measured the actual DNA Motorsport spring rates? 
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    Post the actual drop if they are going on the 04 once installed please. Thank you
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