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Setting Bias

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harrier
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2011/02/10 20:34:34 (permalink)
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Setting Bias

I've put a pedal box in the car. On my rally cars I used to just find a nice piece of dirt and play with the bias til I was happy. The current car is a road/club car, surely there's a more scientific way to do this. What do others do ?

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    jpayne
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    RE: Setting Bias 2011/02/11 04:16:25 (permalink)
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    Get the car off all four wheels, jackstands like!
    have your assistant, who helped bleed the brakes, put pressure on the pedal until the fronts only just lock up, best do this wheels off as the leaverage of the wheel will make it harder to know when the pads are just grip. at this point you want to adjust the bias to where you want. For example if you want the fonts to lock first the rears should just be free to turn, the more fine pressure added to the brake pedal without the rears locking the more front bias. process is reverse if you want rear bias.
    Best to check on both sides to make sure you have even pressure on both sides.
    A more scientific way would be to set the fronts with known pressure on the pedal, then determine torque to spin them with a torque wrench then check the rears in the same way. For example 20 Nm to turn the fronts vs 5 to turn the rears...dont know whet it means but it may help in settings for future readings.

    cheers,

    JP
    #2
    harrier
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    RE: Setting Bias 2011/02/11 21:27:48 (permalink)
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    Hmmm, ok. So what sort of split would you have on a 1600 ? Not sure how to get that consistent brake pressure... I do like the idea of a torque wrench..... Wonder what the track day warriors do
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    muzza
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    RE: Setting Bias 2011/02/12 18:24:56 (permalink)
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    http://www.safetstop.com.au/test_prices.html
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    harrier
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    RE: Setting Bias 2011/02/12 23:22:13 (permalink)
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    Didn't think about that... I'm in Vic, some of the local brake joints must have access to a similar setup.

    Cheers,

    Mark
    #5
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