Poll: Brake upgrades..what kind of ratio?, F=big/R= big or F=big/R=little or ??? |
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Poll: Brake upgrades..what kind of ratio?, F=big/R= big or F=big/R=little or ??? |
Mueller |
Feb 3 2005, 07:27 PM
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#1
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
okay...for a factory 914 /4, the front calipers (piston area wise) are 1.61 larger than the rear....(42mm and 33mm)
for early 911's (up to '84), the fronts are 1.6 larger from '84 to '89, the fronts are only 1.3 times larger than the rears....then the ratios vary from 1.4 to 1.7 until the arrival of the 1st Twin-turbo, that car has calipers that have piston areas 2X the size of the rears !!!!! I'm just wondering what combo people have successfully ran.....it's interesting to note that the standard Boxster front calipers if bolted to the front of a 911, the Boxster piston area is only 1.05 larger than the standard 911 fronts.....seems like a darn near equal swap, except for the bigger pads you get with the Boxster calipers (IMG:http://www.914world.com/bbs2/html/emoticons/smile.gif) |
Andy |
Feb 16 2005, 02:11 PM
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#2
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Member Group: Members Posts: 106 Joined: 25-September 03 From: Fort Collins, CO Member No.: 1,194 |
Then I better hold off on the wide slicks and keep my 55 series for taking the 914 to the track! (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) Just kidding, friction is independant of surface area using the "standard model" which is a simplified system that is pretty far from covering all examples, it does work for most, but for more extreme examples, like tires, it is no longer accurate. This is kind of a pet peeve of mine as most teachers simply teach the standard model and state that it's just counter-intutive and leave it at that, often not even knowing that they're misleading people. I'm not saying that in case of brake pads the standard model would give inaccurate data. In most cases friction is independant of surface area. Can you tell I work in higher education? http://hyperphysics.phy-astr.gsu.edu/hbase/frict3.html |
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