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991 Turbo track car

 
Old 01-25-2019, 10:26 PM
  #226  
nolimits
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Default Girodiscs - for TTS

Any comments on how well Girodisc rotors worked on track vs OEM PCCBs ? Stopping power same or lesser due to less swept area? What pads did you use and were they quiet, street worthy too? I like the PCCB stopping capability and lack of noise but am weighing the cost/performance issue. Giros less of course. I'm assuming aggressive pads could offset less Giro swept area and thus stop similar, but would be noisy on street. Want to keep OEM PCCB calipers. Any input appreciated, lap data differences especially if you have any. Thanks
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Old 01-26-2019, 02:02 AM
  #227  
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Originally Posted by nolimits View Post
Any comments on how well Girodisc rotors worked on track vs OEM PCCBs ? Stopping power same or lesser due to less swept area? What pads did you use and were they quiet, street worthy too? I like the PCCB stopping capability and lack of noise but am weighing the cost/performance issue. Giros less of course. I'm assuming aggressive pads could offset less Giro swept area and thus stop similar, but would be noisy on street. Want to keep OEM PCCB calipers. Any input appreciated, lap data differences especially if you have any. Thanks
Girodisc rotors combined with Ferrodo DS1.11 pads are different in feel from PCCB and stock pads, but the overall effect is a wash on lap times. The OEM pads have a harder initial bite, the Ferrodo's are more constant. Both feel brilliant, both give me similar lap times. I found the Ferrodo's have a bit of squeal for the first few hundred miles until they are truly bedded, but after the rotors are really set there is very little brake noise at all on the street. After a track event, if they do have some noise, I use a power washer to spray into the calipers to clean out any dust and it clears any remaining squeal or grinding sounds. Overall, the risk of killing a set of rotors (at $5600 per rotor) is not worth it to me, and the Girodisc/Ferrodo combo is every bit the equal. I'm putting that setup on my GT2 RS before the first track event in March, without hesitation. If you have questions, contact Clarke at Apex Performance and get ready to hear an expert at work.
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Old 01-27-2019, 08:45 PM
  #228  
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Sounds good, will probably get a new set of pccb to store, and get Giro for use til any sale. I see 2rs ADMs coming down, vodoo 2rs tempting if possible. If I can get TTS to keep up with 2rs I'd be happy, need to do a little power work to get there, suspension tires good.
Any like new Giros out there ?
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Old 02-11-2019, 01:55 PM
  #229  
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Originally Posted by Randyc151 View Post
Definitely give the Cup 2 in 265/325 a try sometime. I run the 991.2 GT2 RS version of the 265, and the Mercedes version of the 325. They cut my times 1.5 seconds, and seem to be stiffer for better control in braking too. And they also fit my car with Techart springs without meaningful rubbing. I try to keep them between 30-33 psi.
What about 20" 265 CUP2 R front and 325 CUP2 Mercedes rear?
Is it safe for 4 wheel drive considering different models of tires?
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Old 02-11-2019, 03:02 PM
  #230  
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Originally Posted by wirx View Post
What about 20" 265 CUP2 R front and 325 CUP2 Mercedes rear?
Is it safe for 4 wheel drive considering different models of tires?
I've thought about that combination, but ultimately decided that it's possible it would be too unbalanced. I don't think it would hurt the 4WD, but without the same rear traction, I think you loose any benefits of the better front grip with more understeer as you wrap the corner. But hey, give it a try and report back!!
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