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) |
fiid |
Feb 16 2005, 11:25 AM
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#2
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Turbo Megasquirted Subaru Member Group: Members Posts: 2,827 Joined: 7-April 03 From: San Francisco, CA Member No.: 530 Region Association: Northern California |
Friction is a function of normal force, not of surface area.... so it is just the piston size that matters, not the pad area. ( http://www.school-for-champions.com/scienc...ce/friction.htm )
I would be a little careful about using the 911 ratios as too much of a data point since their weight distibution is probably a little different (wrong) compared to the 914. The MR2, Elise, Europa, Esprit, X1/9, Ferarri 360 (engine is a little heavy here) might be more interesting though..... It seems like it is possible to correcly balance everything up to and including A calipers on the front with the stock 914 rears - which is what I am doing. If I were you - I'd probably just go to M calipers.... Don't forget - the other way to increase braking is to reduce weight..... Perhaps some fibreglass decklids would help :-) Mueller: Sorry for abrubtly ending the phone call - I'll call you back today sometime... I had to do a demo for the board. |
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