I've got an Audi A4 Quattro that I DD, Autocross and teach HPDE ( Track Days ). Originally I tried the TT carrier / A8 rotor (312mm ) upgrade. I later switched to Porsche Boxster calipers because I was getting pad taper on Track Days.
I agree that girling 60 are too heavy compared to 54. With good pads 54 offer more than enough stopping power.
I had this retrofit on my Jetta and I was a big fan of it. The unsprung weight complaint I find to be a bit much. As stated above, the weight difference isn't exceptional. The gain here is that you have a greater surface area of clamping force with the addition of an extra caliper piston. Overall, the cost/benefit of this setup is great.
Rear calipers are a Porsche 944T, the disks in a VW Corrado / Golf G60, 280mm, 274mm lowered to the clamps are anchored with an adapter for Grinling54, is to lower a bit with the grinder, but it is simple
A Mk2 6 line kit will do you just fine here. The Caliper ends up in almost the exact same place as the 9.4 calipers. Ive been runnin Mk2 lines on my 20v car with the Girling 60s for years and theyre not even remotely tight when the car is raised.
Maybe take a look at the Girling 60 calipers and the 11.2 inch rotors from a 'rado g60. Nice large dual piston calipers and 11.2 inch rotors on a mk2 is just about overkill.
i have the girling 60 dual piston calipers i love em i can pretty much lock them any time i want (SS lines and red box pads. stock master cyl)
Personally because of the problem with using 11" rotors with calipers designed to be used with 10 5/8" calipers, AND the excessive weight, I would stick to a VW based brake upgrade. The Girling 60 calipers will fit on the VR6 and ABA steering knuckles, but the brake pads overhang the inside edge of the 11.0" rotors by just under 1/4".
Girling 60's if you want 2 pots. Save yourself the head ache and get some wilwoods in the classifieds if you want more then a Girling 54.
the upgrade really isn't worth it. i have girling 60s with a 23mm MC and 11" rotors on my TDI. the problem is that the booster doesn't seem to keep up, so you need to stomp the pedal to get the bite you want.
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