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Need help determining feasibility of designing a stability system

  1. Apr 24, 2013 #1
    Hello everyone!

    This is my first post here, and I'm a recent graduate (within 1yr) of a BS in Mechanical Engineering. I have always been a car nut, and I'm interested in designing, or installing and tuning, a stability control system for my car.

    I recently purchased a 2012 Subaru Impreza WRX. The car is all wheel drive, and has open front and rear differentials, and a standard viscous coupling center differential. As many know, the STi model has a dynamic control system in it already. It utilizes a helical front diff, and a torsen rear diff, with an electrically controlled viscous coupling in the center (DCCD).

    So why not just upgrade to an STi, instead of designing my own system? After some research, the mighty Nissan GT-R has an open front differential and uses an electronic stability control system to provide super handling. I would love to design such a system myself for my WRX....more-so for fun and learning about controls rather than from a cost-savings aspect.

    So, how feasible is it to design a system for my car? Am I in way over my head? I would plan to use the STi center diff (DCCD), with a tune-able controller created by DCCDPro. I would intend to use the wheel speed sensors and abs module to actuate the brakes in order to provide stability control for the F&R diffs, while using the DCCDPro to control the center diff. Ideally, the two systems would work separately (at least at first), and would complement one another.

    Any constructive thoughts/guidance?

    Thanks for reading this lengthy post!
  2. jcsd
  3. Apr 24, 2013 #2


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    I'm afraid that I don't know anything about new cars, or foreign ones. My only concern is that you don't do anything to compromise the safety of the vehicle, for both yourself and bystanders. Rigorous testing should be implemented at every stage to ensure that you haven't inadvertently lengthened your braking distance or something else of a detrimental nature.
    Also, think twice about it if your car is still under warrantee; that might void it.
  4. Apr 24, 2013 #3
    Thanks for the consideration. There would be lots of safety testing, performance, and stability testing. Although the factory ABS system is fairly unintelligent, it would be necessary as to not impede it with the control unit. Ideally, this system would not start working until high g loads and rotation is seen and as an added control, only when high levels of throttle are applied. Also, I am not concerned about warranty.
  5. Apr 24, 2013 #4


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    What are you going to use for transportation while you have your car torn down/torn up?
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