All Things Mk5 > Performance Modifications
Porsche caliper's upgrade on Edition 30
the bruce:
piston sizes of Stoptech ST-40 BBK:
--- Quote ---It's 34 mm and 38 mm.
--- End quote ---
So let's do the math:
Pi * radius² = area
908 mm² + 1134 mm² = 2043 mm²
stock Ate FN3 54 caliper = 2290 mm²
So the Stoptech ST-40 seems to be a good match. :happy2: Keep in mind
a BBK also provides better pad pressure distribution and larger rotor size.
Cayenne brakes aren't (there are three):
34/36/38 mm : 907.920 + 1017.876 + 1134.115 = ~ 3060 mm²
32/36/38 mm : 804.248 + 1017.876 + 1134.115 = ~ 2956 mm²
30/34/38 mm : 706.858 + 907.920 + 1134.115 = ~ 2749 mm²
.... obviously Cayenne/Touareg/Q7 calipers WILL increase pedal travel (without a
much larger master cylinder) and weaken both brake force distribution, pedal feel
and booster/brake assist functionality. At least LHD Golfs/GTIs have a dual rate
booster and such significiently different pedal travel will shift its threshold.
BTW, S3/R32/R - FNRG 57 mm : 2552 mm²
Don't get me wrong - shurely some other BBKs also have proper piston sizes,
but I bet many don't. Before buying a BBKs make sure it is a good match to your
existing system (master cylinder and rear calipers).
oak_grun:
wow, thanks for the input guys :happy2:..so in short the correct calipers for the Porsche upgrade come off a Boxster.
what disc's do people who use the Boxster caliper use?
thanks
bacillus:
--- Quote from: oak_grun on January 10, 2013, 01:14:06 pm ---wow, thanks for the input guys :happy2:..so in short the correct calipers for the Porsche upgrade come off a Boxster.
what disc's do people who use the Boxster caliper use?
thanks
--- End quote ---
The standard 312mm vented front discs.
oak_grun:
Will they it behind standard ED30 alloys?
Does anyone have any pics of caliper's fitted to ED 30?
Thanks
bacillus:
--- Quote from: oak_grun on January 12, 2013, 03:02:50 pm ---Will they it behind standard ED30 alloys?
Does anyone have any pics of caliper's fitted to ED 30?
Thanks
--- End quote ---
iirc you will need a 3mm spacer to clear the caliper on each side.
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