997 GT3 Mk1 - front disc thickness?

[MB 1]

Anyone know what the OEM dimensions are for steel discs? Diameter seems like 350mm, but I need the thickness.

Can't find anything conclusive on the web!

Thanks.

[nsm3]

Not sure if this helps, but my last report states the front disc thickness at 33.3mm, with no % worn indication and no advisory that they need changing?

Car has 8,800 miles.

[agtlaw]

6RS discs are 34mm new.

[nutcase]

I'm sure someone will be around in a minute with this info- but cautionary tale for you:

Recent discussion with Porsche when I was pressured into changing front discs on a Cayenne (when it went in for pads according to sensor):

They call me and say that on checking pads, the front discs are 'dangerously low'.

Me: "What's the measurement then?"

OPC: "well, they're at 32.5mm, Sir- and the minimum is 32.00mm"

Me: "What's the thickness when new?"

OPC: (2 minutes checking/fumbling around, then back on the phone) "34.00mm Sir"

Me: "So in reality they've still got 25% life left"

OPC: "Errm, yes"

So well worth asking the question.

In the end I decided to get them done, as it was just about to do a Cornwall trip.

[agtlaw]

I heard somewhere that Cayenne turbo discs are the same size as GT3 discs but that GT3 discs are more expensive! I can't confirm this as I've never checked.

If you're replacing your GT3 discs then consider getting the motorsport discs as there is no discernible difference apart from the cheaper price of the motorsport part.

[MB 1]

Thanks for the info chaps.

Might be trialling a new disc / pad setup. My current ones are near new but will be kept as spare

[S1MMA]

States 34mm front, and 28mm rear disc thinkness in the orig brochure for 997 GT3, non ceramic.

[chris7676]

nutcase said:

In the end I decided to get them done, as it was just about to do a Cornwall trip.

You must be a nutcase

[majordad]

One of the things people hate about Piston Heads is the amount of posters that say things like " you must be a nut case ". I know a lot of people who have left here due to comments like this.

The man has his reasons, dont lable him a nutter !

[ttdan]

agtlaw said:

I heard somewhere that Cayenne turbo discs are the same size as GT3 discs but that GT3 discs are more expensive! I can't confirm this as I've never checked.

If you're replacing your GT3 discs then consider getting the motorsport discs as there is no discernible difference apart from the cheaper price of the motorsport part.

I believe the discernible difference is that the m/s ones are thinner/lighter.

[agtlaw]

not the ones i bought.

edit: measured thickness of cup car discs at 34mm but didn't actually compare weight.

Edited by agtlaw on Wednesday 21st September 21:48

[MB 1]

Are they OPC supply?

[chris7676]

majordad said:

The man has his reasons, dont lable him a nutter !

I haven't, it's his very profile name

Seriously, there were no reasons to change the discs, 2-3 mm could have lasted for tens of thosand miles.

[Slippydiff]

majordad said:

One of the things people hate about Piston Heads is the amount of posters that say things like " you must be a nut case ". I know a lot of people who have left here due to comments like this.

The man has his reasons, dont lable him a nutter !

I suspect Chris was being ironic. With 25% of "Nutcases" disc wear left, a trip to Cornwall was unlikely to see them worn to their wear limit (unless of course the "Nutcase" was starting off from N Korea . . . . .)

One of the things which people hate ?
If people are leaving PH, having been accused of being "nutters" or "nutcases, perhaps this isn't the best forum for them to post on in the first place !

Edited by Slippydiff on Thursday 22 September 09:51

[MB 1]

agtlaw said:

I heard somewhere that Cayenne turbo discs are the same size as GT3 discs but that GT3 discs are more expensive! I can't confirm this as I've never checked.

If you're replacing your GT3 discs then consider getting the motorsport discs as there is no discernible difference apart from the cheaper price of the motorsport part.

Are the motorsport ones OPC supply?

[rash_decision]

majordad said:

One of the things people hate about Piston Heads is the amount of posters that say things like " you must be a nut case ". I know a lot of people who have left here due to comments like this.

The man has his reasons, dont lable him a nutter !

[fioran0]

If it matters, the cup (motorsport) discs have different cross drilling and the wheel bolt holes are a larger diameter to allow the bushings for the centerlocks to fit through.

The difference is subtle but it is there. You can't fit the road car discs onto the Cup due to the smaller 5 holes.