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      08-19-2008, 09:38 PM   #126
ArtPE
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Drives: e46 M3
Join Date: Dec 2007
Location: Earth

Posts: 471
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treaded tires stop faster than ones with less tread for a given compound and psi...basic physics
RWD
full tread 100%
1 mm 165% (59 m vs 97 m, ~120 ft more)
FWD
100%
1 mm 218%, over twice as long...
in the dry...
look up the differences in the Bosch handbook

pistons have nothing to do with modulation...
it's the fixed caliper that enhances that...no moving mass...
actually a single piston fixed would be the best, but since run-out occurs, it would pulsate badly...
so multi pistons on a fixed caliper will 'ride' the warp...
it's a very simple, basic hydraulic circuit...mech eng 101...more pistons will grip at different levels, they will NOT operate perfectly in synch when paralleled...

any of us trying to out smart 20 PhD's at BMW (actually Conti/Teves) is laughable...

the M3 will never exceed 110 on most tracks...and the lowest speeds are 40 or so, so the 100-0 is a much more demanding test than most realize...a 2 minute lap may have 6 braking zones...1 per 20 sec...

it's ALL about E = 1/2 m v^2...the fact that the M3 weighs 300-400 lbs less than the RS4/ISF/C63 has a lot to do with it's braking efficiency, as does tire size...

99.9% think we are good drivers...0.1% are...and a good driver will make either systeme work, and out-brake 99.9% of us with the 'lesser' system...

wanna brake better? practice and take some schooling...it's a street car
all differences are so minute they are masked by driver skill levels...
most basic formula cars use single piston/floating Girlings, iirc...

Last edited by ArtPE; 08-19-2008 at 10:05 PM.
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