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Front/Rear brake sizing question
I was wondering if not just your weight distribution should determine the brake sizing and brake force distribution, but also how sticky your tires are. It seems that in 1978 when Porsche sized the brakes for the 930, street tires certainly didn't grip nearly as much as they do today. So if you brake at the limit today you'd be slowing down more rapidly than in the late seventies and more weight would transfer forward and the forward brakes would be doing more work in relation to the rear compared to what went on when the car was new. Therefore brake force distribution should send a little more force to the front and the front rotors should be slightly larger with today's tires. Any thoughts?
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Keith 1979 930 2007 WRX wagon |
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12-04-2004, 06:48 PM
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just one bump
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Keith 1979 930 2007 WRX wagon |
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12-04-2004, 11:33 PM
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Join Date: Oct 2002
Location: SE PA
Posts: 3,188
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A few weeks ago I did the math and it showed that the 1.6:1 bias Porsche used in early 911s is about right for tires that produce about 1g of decelleration. It stands to reason that on skinny hard tires you could use more rear bias, while on R-compound or slick tires you could use more front.
However, in the real world--as Bill V pointed out--that 1.6:1 number seems to work well for track cars braking very hard on sticky tires. I'm not sure how often a 911 without aero enhancements gets more than 1g of decelleration anywhere. Maybe someone has data logs? |
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12-05-2004, 07:56 AM
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