The static noise test is generally based on the MSA procedure (Castle Combe don’t follow the rev level on 100dB days) which can be found on the MSA website and specifies proximity to exhaust outlets.
Another Cayman
- Thread starter ralphmusic
- Start date
With the OEM rear brake pads back on (having swapped back from 332 PFC) I cleaned out the discs after Goodwood on Monday and noticed the rather odd pad profile pictured below:
That both OS and NS were the same suggested the pads are OK and looking on Rennlist, one poster showed an image of the same profile on his 2022 model remarking that the pad surface in contact with the rotor was less than 1/2 of the total area of the actual pad size and there ‘seemed’ to be two tiers of pad material. The initial tier is much smaller that the base tier of the brake pad.
I am now not sure how to measure pad thickness and what to do when the second ‘tier’ is worn down but will find out.
That both OS and NS were the same suggested the pads are OK and looking on Rennlist, one poster showed an image of the same profile on his 2022 model remarking that the pad surface in contact with the rotor was less than 1/2 of the total area of the actual pad size and there ‘seemed’ to be two tiers of pad material. The initial tier is much smaller that the base tier of the brake pad.
I am now not sure how to measure pad thickness and what to do when the second ‘tier’ is worn down but will find out.
My Centre (Exeter) opined (since it was all news to them) that I should replace the pads when the raised tier gets down to 3mm. I am not sure that is right but tomorrow I'm having "full size" PFC 332 rear pads fitted. I'll get the OEM rear pads back and look up the part # - oddly the OEM factory fitted front pads (# 9GT.615.115.G) are not listed in the PET system (I have PFC 331 compound front pads on the car).
Mystery solved, the OEM rear pads have a wide chamfer which can't be seen when the pads are mounted, as in image below:
Reducing the car's weight today, trimmed 820 grams (1.8lbs) of OPR from the tyres after Silverstone track day on Wednesday. Hot track, slicks and soft semi-race rubber being laid down. Only 7 red flags including a Silverstone instructor off in the gravel at Brooklands...
Starting to see cracks in front discs after 8 track days so PFC slotted discs going on next week - same price as OEM discs, both after 10% discount and inc. VAT.
Starting to see cracks in front discs after 8 track days so PFC slotted discs going on next week - same price as OEM discs, both after 10% discount and inc. VAT.
Design911 with 10% Club discount. PFC supply chain isn't great so you're correct to look earlier than later - if supply problems, call PFC on +44 1295 221023 - they may have some, can tell you the names of all their distributors, or worst case tell you when stock may arrive in UK.
AndrewCS said:
I had Girodiscs on the 3.8L Cayman with Ferodo DS2500 pads.
First GT4 was all OEM.
I had/have OEM discs with PFC pads on the GT3/GT4.
I will have PFC front discs and PFC pads front and rear.
3.8L combo was good
First GT4 was better (380mm OEM discs v 350mm Girodiscs)
OEM with PFC pads GT3 OK
This GT4 with OEM discs with PFC pads Outstanding
PFC front/OEM rear discs + PFC pads - we'll see...
Giro discs are £721 each v PFC £535 each (both pre discount and VAT) at Design911. I bought Girodiscs directly from Girodisc USA and they were slightly cheaper than UK supply.
The other thing about Cup2 tyres is that they are soft and they pick up small stones which get embedded - also the car sits on carpet back pads and the tyres picked up that pattern when parked up on return from Silverstone - a 3 - 4 hour drive on a hot day. It is a little odd because Michelin specs show the Cup2 rubber being marginally harder than 4S and of course with less tread depth and fewer block they should not heat up as much as 4S would given same duty cycle.
One thing about the PFC discs is that they have a common bell for Iron and Ceramic discs. This means that there are ten holes, five for drive pins and 5 for wheel bolts. The OEM/Girodisc Iron discs have just the 5 holes + 2 for the screws that secure (lightly) the disc to the hub so a bit fiddlier to fit callipers , see images below.
I have had two issues with Porsche Connect; one being ‘Track Precision’ which remains unresolved after several months, and the other being ‘My Porsche’. This latter case has been abandoned with the issue being attributed to “intermittent“ connections.
Anyway, Porsche offered compensation in the form of two days at Ascot but being more interested in horsepower, I’ve swapped that for Carrera Cup hospitality at Thruxton at the end of August.
Anyway, Porsche offered compensation in the form of two days at Ascot but being more interested in horsepower, I’ve swapped that for Carrera Cup hospitality at Thruxton at the end of August.
Thanks again for the PFC info Ralph. I've just ordered a complete set of discs and 331/332 pads via Ninemeister to have ready to go whenthe need arises.
I was told PFC have a batch of 50 sets of discs heading for production and they should be available in approximately 6 weeks. But I'm fully expecting them to take longer than that...
I was told PFC have a batch of 50 sets of discs heading for production and they should be available in approximately 6 weeks. But I'm fully expecting them to take longer than that...
Have been running the PFC on my GT4 since 2020. From a performance and endurance PoV - they stand up well.
Done around 21 track days + road usage including to European tracks - and only had 1 change of front rotors. Still on the first set of rears.
I have had a few pad changes most recently moving from the MR pads to normal Pagid RSL 29... and these work really well with the PFC Rotors.
***NOTE***
Only thing is that because they are truly floating only held with the retaining spring clip... you may develop some rotor rattle, when the brake are cold or not expanded at full operating temp... which is annoying, if you hate rattles like me!. Once at full temp .... like on track - its less of an issue....also because the rotors are actually driven by the dogs, its not a performance issue either. Occurrence of this issue will also depend on if you have the 2 coil or 3 coil clip. The clips are NOT interchangeable so if you have a rotor that has 2 coil - the hat and rotor are also for 2 coil and you cannot just change the spring to 3 coil. So definitely check what you have, as sometimes the batches can get mixed up and you might get unlucky and missed matched on one of your corners... That said, i believe there are only supplying 3 coil now.
***NOTE***
Done around 21 track days + road usage including to European tracks - and only had 1 change of front rotors. Still on the first set of rears.
I have had a few pad changes most recently moving from the MR pads to normal Pagid RSL 29... and these work really well with the PFC Rotors.
***NOTE***
Only thing is that because they are truly floating only held with the retaining spring clip... you may develop some rotor rattle, when the brake are cold or not expanded at full operating temp... which is annoying, if you hate rattles like me!. Once at full temp .... like on track - its less of an issue....also because the rotors are actually driven by the dogs, its not a performance issue either. Occurrence of this issue will also depend on if you have the 2 coil or 3 coil clip. The clips are NOT interchangeable so if you have a rotor that has 2 coil - the hat and rotor are also for 2 coil and you cannot just change the spring to 3 coil. So definitely check what you have, as sometimes the batches can get mixed up and you might get unlucky and missed matched on one of your corners... That said, i believe there are only supplying 3 coil now.
***NOTE***
Thanks, good info..
^ I had slotted on my old 3.8L Cayman because of track usage
I don't mind - I post my experiences as shared info has helped me in the past and you give, you receive..
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