cactusjackslade 146 Posted March 10, 2014 Report Share Posted March 10, 2014 (edited) Hi vr gurus, I have located a set of rear boxter s calipers, adapters and 312mm discs intended for the front of a golf vr6. My question is are the rear boxter s calipers any more powerful than the standard vr fronts? After searching on here I haven't found a definite answer.. Any advice would be most welcome. Regards Zac. Edited March 10, 2014 by cactusjackslade Link to post Share on other sites
jamesw6810 80 Posted March 10, 2014 Report Share Posted March 10, 2014 4 pot calipers on the boxster rears, yes they will be more powerful plus the friction area of the 312mm discs is larger. Link to post Share on other sites
VIW28 29 Posted March 10, 2014 Report Share Posted March 10, 2014 No good I'm afraid. The piston sizes are too small. These will be no better than a conventional caliper on a 312mm disc.You need front calipers, part numbers 996 351 425 & 996 351 426. The middle number represents front or rear, 351 is front and 352 is rear. Link to post Share on other sites
cactusjackslade 146 Posted March 10, 2014 Author Report Share Posted March 10, 2014 Thanks for reply's but once again conflicting opinions lol. Difficult one this.. Thanks viw28 for those part numbers... The front Porsche calipers would undoubtably be more powerful. Shame as everything I need is with this setup... Link to post Share on other sites
UnitedMotorsport 55 Posted March 10, 2014 Report Share Posted March 10, 2014 What are the piston diameters of each piston in ONE caliper? Link to post Share on other sites
cactusjackslade 146 Posted March 11, 2014 Author Report Share Posted March 11, 2014 (edited) What are the piston diameters of each piston in ONE caliper?I'm pretty sure they are 28 & 30 mm 4 pot calipers so with my calculations that's a total of 116mm piston area? Is that correct? Edited March 11, 2014 by cactusjackslade Link to post Share on other sites
UnitedMotorsport 55 Posted March 11, 2014 Report Share Posted March 11, 2014 (edited) I'm pretty sure they are 28 & 30 mm 4 pot calipers so with my calculations that's a total of 116mm piston area? Is that correct? LOL, no. You confused distance with area. Here is how it is done:(28/2)*(28/2)*3.14159 = 615.752 square mm (30/2)*(30/2)*3.14159 = 706.858 square mm Add together 615.752 and 706.858 = 1322.61 square mm, this is for one side of the caliperSo Double 1322.61 = 2645.22 square mm total. take this 2645.22 and divide it by pi (3.14159) = 842 Now take the square root of 842 = 29.02mm radius of effective single piston. Double 29.02 to get effective single piston diamater = 58.04mm From memory, a 288/312 caliper has a 54mm diameter piston. I will let you draw your own conclusion from this. Edited March 11, 2014 by UnitedMotorsport Link to post Share on other sites
jamesw6810 80 Posted March 11, 2014 Report Share Posted March 11, 2014 (edited) No good I'm afraid. The piston sizes are too small. These will be no better than a conventional caliper on a 312mm disc.You need front calipers, part numbers 996 351 425 & 996 351 426.The middle number represents front or rear, 351 is front and 352 is rear.boxster front calipers wont fit though, they mount on the rear of the porsche disc, and the vr6 calipers mount on the front, the bleed nipples will be upside down. Real world opinion away from the calculations, i had boxster rear calipers on my leon cupra non r. 312mm discs, huge improvement over the standard cupra calipers in braking performance. Couple with braided brake hoses and decent pads, i had oem porsche textar pads in there. Calculate all you want on the areas etc, but i guarentee they are a big improvement, not to mention they look amazing. the leon cupra is 178bhp with a kerb weight of 1376kgthe vr6 is 174 bhp with a kerb weight of 1155kg so actually should perform better on the vr6 if comparable parts are used....... Edited March 11, 2014 by jamesw6810 Link to post Share on other sites
CALICO 130 Posted March 13, 2014 Report Share Posted March 13, 2014 boxster front calipers wont fit though, they mount on the rear of the porsche disc, and the vr6 calipers mount on the front, the bleed nipples will be upside down. Not if you mount the nearside on the offside and vice versa. Link to post Share on other sites
Lukey. 381 Posted March 13, 2014 Report Share Posted March 13, 2014 Ha yea I just thought that too Link to post Share on other sites
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