GiroDisc Rear Rotors...Who's done it?
#1
GiroDisc Rear Rotors...Who's done it?
I am looking to do GiroDisc rotors all around. The fronts will work as is, but from what I've read, the rears require removing the e-brake or an adapter of some sort to fit. Has anyone been able to fit GiroDisc rotors on their 993 rears? If so, how?
#2
Addicted Specialist
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Hmmm, just read up on these. So I am curious: what are you looking for these to do on your 993 that would out-perform the otherwise superb factory rotors? Seems like a costly price delta (to me, of course), and I'm unclear of the intended benefit, if you don't mind my asking?
Edward
Edward
#3
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Hmmm, just read up on these. So I am curious: what are you looking for these to do on your 993 that would out-perform the otherwise superb factory rotors? Seems like a costly price delta (to me, of course), and I'm unclear of the intended benefit, if you don't mind my asking?
Edward
Edward
#4
Ive been waiting on them to produce a reasonable rotor for the rear, that still retains the drum p-brake. They haven’t developed them (as far as the last time I checked) since the market is not huge. The reason, or benefit would be, lighter, not drilled (cracks) and aluminum hats that can be reused.
There are kits w/ 330 to 350mm rotors which do retain the p/b
the Gyrodisk is too thick @32mm for use in back where the stock caliper want at most 28mm rotors
#5
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The reason the 2 piece rears w/ parking brake haven't been developed is purely related to geometry, specifically the the rotor diameter. The min rotor size needed to retain the p/b and attach an annulus to the hub is ~330mm, biggest stock 993 is 322.
There are kits w/ 330 to 350mm rotors which do retain the p/b
the Gyrodisk is too thick @32mm for use in back where the stock caliper want at most 28mm rotors
There are kits w/ 330 to 350mm rotors which do retain the p/b
the Gyrodisk is too thick @32mm for use in back where the stock caliper want at most 28mm rotors
#6
Race Car
Stoptech has rear rotors and hats that retain the parking brake, however they are 332mm x 32m rotors. So they wont work with the current caliper as Bill mentioned. And spacing out the rear caliper is a lot more work...
#7
Below the 2 on the left are RS rear, the middle one i modified, the one on the right is a stock front
This is a non trivial mod
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#8
Rennlist Member
Wow... Very interesting Bill. I've got a knee mill and a bunch of spare calipers lying around that could be good candidates for tinkering.
Do you remember how much you took off when you decked the mounting surface of the front 993 caliper?
Also, what rotor were you running on that experimental caliper?
Finally were you keeping the parking brake?
Do you remember how much you took off when you decked the mounting surface of the front 993 caliper?
Also, what rotor were you running on that experimental caliper?
Finally were you keeping the parking brake?
#9
Race Car
Wow... Very interesting Bill. I've got a knee mill and a bunch of spare calipers lying around that could be good candidates for tinkering.
Do you remember how much you took off when you decked the mounting surface of the front 993 caliper?
Also, what rotor were you running on that experimental caliper?
Finally were you keeping the parking brake?
Do you remember how much you took off when you decked the mounting surface of the front 993 caliper?
Also, what rotor were you running on that experimental caliper?
Finally were you keeping the parking brake?
In these photo's Bill removes the mounting tabs off a RS rear caliper so that (from memory) he could mount them on his Early hot rod.
#11
Race Car
That's essentially how the stoptech caliper kits work. The caliper bodies are all radial mount then you add the axial adapter depending on the size of the rotor.
Here is the adapter I drew up in Fusion 360 and had made to put the 355mm rear rotors on my car.
I used studs instead of bolts, makes it easier for pad changes etc.
Here is the adapter I drew up in Fusion 360 and had made to put the 355mm rear rotors on my car.
I used studs instead of bolts, makes it easier for pad changes etc.
#12
#14
Drifting
brakes only slow you down...who needs thatt! I havent found need for better rear disks unless you change brake bias via different (RS or some other) calipers or another way. not that cost effective. My rear pads/rotors last forever and that with P/Vs removed.