997.1 GT3 Cup Rotors

[WindyM]

Has anyone fitted the Motorsport 997 Cup car rotors to a road (and track day)-going 997.1 GT3 and produced a how-to guide (assuming it's possible)?

And if you have, how does it drive on the road? Are they unbearably squealy?

[Porsche911R]

It’s just a cheapo lighter disk which don’t last as long, race teams just thrown them away every race.

Has nothing to do with squealing.

Better off with Alcon or AP.

[WindyM]

Don't last as long? If the standard Porsche rotor is made of chocolate, what did they make the Cup rotor out of?!
I am running Alcons (because I got 5 track days out of the standard Porsche rotor) and I want to take the warranty up to its 15th birthday, so I was looking for something Porsche but more durable than the standard (then I'll put the Alcons back on).

[STiG911]

WindyM said:

Don't last as long? If the standard Porsche rotor is made of chocolate, what did they make the Cup rotor out of?!
I am running Alcons (because I got 5 track days out of the standard Porsche rotor) and I want to take the warranty up to its 15th birthday, so I was looking for something Porsche but more durable than the standard (then I'll put the Alcons back on).

Standard Porsche discs shrug off 'normal' or even fast road driving with no issues whatsoever. Throw 4 or 5 heavy track sessions at them and of course they'll need replacing, so your 'chocolate' statement is pointless.

Insofar as the Cup ones are concerned, they're designed with both performance and weight saving in mind, so will be much thinner and, therefore, useless after a race.
You might as well invest in standard rotors if all you're going to do is put the Alcons back on anyway.

[WindyM]

Thanks. I'll forget about the Cup rotors - I've been misled by another forum post.
I think you're right - I'll put another new standard set on. I'm annoyed that I trashed my previous set, and if I put those back on, I doubt my OPC will pass the 111 anyway because the cracks around the holes are beginning to join up.
I think I did most of the damage at a V-Max event. I assumed we'd be allowed to cadence brake to the end of the runway, but instead, we had to brake hard into a short funnel way before the end. You live and learn.

[Steve Rance]

They are far better than the standard items and will last a lot longer. I think we got 2 or 3 race weekends out of a set. On a road car they would last several track days longer than standard. Once you have the bells the discs are pretty inexpensive. They are designed to take a real pounding. Not to save weight. They get so hot that pickup regularly used to catch fire if it fell on the disc. If I kept my 997CS I intended to fit them.

[AlasdairB10]

I've had mine on for over 5000 miles and a few heavy track days with race pads and no sign of undue wear. I've got no experience of Alcon's though so I wouldn't presume to comment about discs I haven't driven.

If I slide off the track on Monday because my discs ought to have been thrown away I'll let you know.

[WindyM]

Thanks, Steve and Alasdair
How did you buy the rotors and bells? Do I need a Motorsport account or can I buy through my OPC?
Do you have any part numbers I can give to my OPC spare parts, please?
Thanks
Paul

Supplemental question - would you recommend changing the rears too, or can I run standard rears and Cup fronts?

Edited by WindyM on Wednesday 10th June 16:34

[AlasdairB10]

I think Design911 has them. These are the part numbers for the fronts but a dealer's parts dept ought to be able to confirm for you - OE No 99735140992 & 99735141092

If you already have ceramics, I'm pretty sure they just bolt on. My local specialist put them on without trouble. I'd do all four with RS29 pads, racing brake fluid and change the warning contacts as well.

[Steve Rance]

WindyM said:

Thanks, Steve and Alasdair
How did you buy the rotors and bells? Do I need a Motorsport account or can I buy through my OPC?
Do you have any part numbers I can give to my OPC spare parts, please?
Thanks
Paul

Supplemental question - would you recommend changing the rears too, or can I run standard rears and Cup fronts?

Edited by WindyM on Wednesday 10th June 16:34

Hi Paul.

If you have a standard GT3 diff in your car, the chances are that it’s relatively ineffective and the car is relying on the rear brakes to compensate - it’s part of its electronic safety net. In that case, I’d be inclined to upgrade to a Guards diff and leave you rear brakes as standard and just fit RS29’s. The guards diff is an excellent upgrade and another step towards unlocking the Superb analog potential of the chassis. If you want to keep the diff as standard, you may want to upgrade the rear discs as they will take a real pounding on a track day. My preference by far would be a diff upgrade and leave the rear discs alone

[Porsche911R]

Steve Rance said:

They are far better than the standard items and will last a lot longer. I think we got 2 or 3 race weekends out of a set. On a road car they would last several track days longer than standard. Once you have the bells the discs are pretty inexpensive. They are designed to take a real pounding. Not to save weight. They get so hot that pickup regularly used to catch fire if it fell on the disc. If I kept my 997CS I intended to fit them.

Rotors and bells ?

The 996/997 Uk cup disks are cheap 1 piece items .

Confused ,:-/

[braddo]

FVD’s website shows front 380mm ‘motorsport’ discs without bells for the Cup cars - around 500 eur per disc.

993 part number!

[WindyM]

Thanks, chaps, but my OPC has confirmed I can fit only the standard Porsche steel disc to extend the warranty - no alternative genuine Porsche parts.
As soon as it's 15 years old and no longer eligible for a warranty, I'll try the Motosport options.
Paul

[Porsche911R]

WindyM said:

Thanks, chaps, but my OPC has confirmed I can fit only the standard Porsche steel disc to extend the warranty - no alternative genuine Porsche parts.
As soon as it's 15 years old and no longer eligible for a warranty, I'll try the Motosport options.
Paul

they look the same and an OPC would never know, not sure why you would buy a warranty on a 997 though, it covers very little after the 1st 3 years, and they state most things are "consumables" did not realise any one would have a full oem GT3 by now !

still pointless trying the motorsport ones imo less metal so more heat, as stock oem retail cars don't run the CUP cooling and weigh a lot more than race cars.

[Matter88]

I've been running the same steel replacements made to PCCB sizing on my 7.1 GT3 for the last 2 years.

Lots of roadtrips, many heavy track days in UK and abroad (c.14,000 miles). Pad choice is Ferodo DS1.11

Cost in 2018 was c.£1000 + VAT IIRC for all x 4 discs and bells.

http://www.reyland.co.uk/

They've been excellent - no issues whatsoever and zero cracking. Worth a consider before stumping up for Alcons. I also run Reyland discs on my E36 M3 race car, they're 3 x seasons old and still spot on.