911turbofan

Hello all, I'm looking at purchasing a 2018 GT3 (8000 miles) from a Porsche dealer and requested PCCB rotor density data to get condition of the rotor. The sales guy said that the car has been only tracked twice. This is the data they sent today. I don't plan to track the car and concerned about PCCB condition. I expect to own the car for no longer than 2 years.
Would appreciate your comments and thoughts on condition of the PCCB on this car. I currently own a 991.1 Turbo with steel brakes and nervous about buying a used car with PCCB. Thank you for your help.

blraider97

If I’m looking at it right, does the data suggest that roughly 50% of the rotor life has been used in 8k miles? Seems like all of the measurements are almost in the middle of the original measurement and the wear limit. If so, that seems like a lot for a car that is being represented as a lightly tracked car. Maybe I’m not looking at it correctly. Will be interested to hear what others have to say.

911turbofan

Thanks for the reply, you are correct, it seems that the rotors are at 50% wear between new and wear limit. Seems excessive for a car that the dealer says has been only tracked twice and has less than 9K miles. Should I be concerned? If I don't track the car, not sure about remaining usable life before it needs replacement.

CarManDSL

This rings all sorts of bells in my mind.
Hate to sound pessimistic, but there are electronic devises that you connect to the rear connector of the central display that can control the mileage recorded.
One can easily drive say, 20k miles and only record it as 9k.

As only very hard charging track miles will shorten the life of PCCB's to 50% in that quick a time frame, maybe do a little investigative poking around to get a handle on the true life of your car.
Who was the original owner? Are they a serious track junkie? Maybe find the local track where they like to drive.

This link will give you a proper sense of what it takes to get to 50%

https://rennlist.com/forums/991-gt3-...3-991-2-a.html

inspire

It all depends what you intend to do with the car during your ownership. If you just plan on street driving, 50% life will last and wear very slowly. I bet it would last well over 75k miles. Of course this number all depends on how you drive and your driving tendencies.

marcus1982

What is this density? I thought pccb wear is measured by minimum weight.
Attached pic from a turbo i saw.

NHmacan

Did you Google the vin? There is a lot of information you can find by doing that. Also does the wear on the seats look like an 8K car? Are there any other signs of track use when you get it on the lift? Rubber in wheel wells, Rear heatshields in wheel well banged up, paint marks on suspension components, aggressive track alignment?

spyderbret

The "older" disks were weighed. The new ones are measured at different points on the rotor. The same but different.

Rolling back mileage on a modern Porsche is next to impossible. I vote major track time. That wouldn't scare me though. See if you can use the info to get a discount. Make sure the pads are thick enough too. The PCCB's will last longer if you change pads around 40-50% wear. If you dont plan on tracking they will last you a long time. Good luck!!

Larry Cable

if you are only going to keep it for a couple of years and wont track it - there is NOTHING to worry about w.r.t PCCB wear.

porsche bud

Agree that the wear numbers look quite high for 8K miles and "lightly tracked". Seems like there may be more to the story, but if you're keeping it 2 years and the car checks out with a PPI, and you like the spec with a good price, could be worth considering. If you have these concerns, a future buyer may have the same concerns, so you'll want to factor that into your decision IMO.

CarManDSL

I did not suggest rolling back the mileage.

Devises can be attached to the speedo that control how much mileage is permanently recorded, for 991 and 992 series.
Can be set, for example; to 10%, 50%, 75%, recorded of actual miles driven.
So say, you drive 20k, but it only records as 10k.
Can't be detected unless you remove the display and visually see the devise daisy chained to the connector in back.
Can't be detected with PWSIS after devise is removed and false mileage now recorded, becomes the permanent record.

Devious at the highest level, but folks are doing this.
Do your homework - Buyer beware.

Manifold

I think that car has been tracked a lot more than twice.

Larry Cable

It's an RS and presumably CPO ... 'nuff said!

johnsopa

ECU engine hours still record as normal, right? Seems to me that the avg miles or KM / hour would be absurdly low. No?

911turbofan

Thanks everyone for your inputs. Really appreciate it. This car is being sold by an authorized Porsche dealer and is being offered as CPO. I talked to the Master tech and he said that while its possible to tamper the odometer, there are many other components that register usage in the ECU.
They are confident that the mileage is legit. on brake wear at 40-50% in less than 9K miles, he mentioned is that if the driver turned on PSM while tracking the car or in DE session, brakes would be used excessively in automated mode to keep the car in control and that would be cause excessive wear.

Would be great to get inputs on other who have swapped out PCCB for non-OEM iron rotors on 991.2 GT3.