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  1. #1
    Join Date
    Apr 2009
    Location
    Michigan
    Posts
    126
    Country Flag: United States

    Free suspension Kinematics and Compliance data - modern performance cars

    Hello all,

    I'm working on spring and sway-bar selections for my 1968 Firebird, and I wanted to benchmark some newer cars to see if my design was in the ballpark. Usually, real data is hard to come by, but I vaguely remembered seeing some kinematics and compliance (K&C) measurements for various cars in Car and Driver magazine a couple years ago.

    I dug though the archives on Car and Driver's website and finally came across the data I was after. Car and Driver had Morse Measurements do K&C measurements on several of their long term test cars that year. Morse Measurements uses a fancy kinematics and compliance rig to measure actual vehicle behavior, and I have high confidence in their data.

    I found the data very valuable, and I hope you do as well. I've attached the .pdf's I downloaded from Car and Driver's website below. I don't think there is any issue in sharing these since they're readily available online (if you know where to look).

    Useful data includes:
    • CG heights
    • Roll center heights
    • Suspension stiffnesses (so you can calculate ride rates etc)
    • Roll stiffnesses
    • Anti-squat / Anti-dive


    2014 CTS-V K&C.pdf
    2013 BRZ K&C.pdf
    2014 Focus ST K&C.pdf
    2013 Mustang GT K&C.pdf
    2013 Accord Sport K&C.pdf
    2014 Corvette K&C.pdf

  2. #2
    Join Date
    Nov 2016
    Location
    Sulphur, La
    Posts
    397
    Interesting info for sure, thanks for posting. I was surprised at the roll axis inclination of the mustang.

  3. #3
    Join Date
    Sep 2010
    Location
    Beach Park IL
    Posts
    2,372
    Country Flag: United States
    You can only get the panhard bar so low in a factory application. That is a large part of why those cars responds so well to the various aftermarket watts links.
    Donny

    Support your local hot rod shop!

  4. #4
    Join Date
    Apr 2007
    Posts
    164
    interesting the Corvette has under 115 lb-in wheel rate in front

    Also cars using 200% rear anti lift under braking... am I understanding that correctly? Isn't that trending toward removing the weight off the tire contact? ie picking the tire up off the road?

  5. #5
    Join Date
    Apr 2009
    Location
    Michigan
    Posts
    126
    Country Flag: United States
    Good question - I have to do some more reading to really understand anti-lift/anti-dive. Here's a link to a long thread on the topic if you have time to look into it: http://www.pirate4x4.com/forum/gener...h-twist-9.html

  6. #6
    Join Date
    Aug 2004
    Posts
    957
    I highly question the Anti -dive/squat numbers, they do not make sense at all.