PCCB vs Steels 991.2 GT3 on road ride

[c4sman]

Has anyone backed to backed the above and noticed any ride quality improvements between the two on road?

[Cheib]

Nope but I do have BBS FI-R’s and OEM wheels on my 991.2 which I do swap over….might be the placebo effect but I do think there’s a very slight difference in how the car rides. Obviously only something you’d notice immediately after change and on a road you know well.

They’re about half the weight saving of the PCCB’s.

[c4sman]

Cheib said:

Nope but I do have BBS FI-R s and OEM wheels on my 991.2 which I do swap over .might be the placebo effect but I do think there s a very slight difference in how the car rides. Obviously only something you d notice immediately after change and on a road you know well.

They re about half the weight saving of the PCCB s.

Stunning wheel and interesting. Maybe not a major difference but a small improvement

[Geneve]

Reduced ‘unsprung’ weight (the mass of the vehicle not supported by the suspension) has a number of benefits, inc reduced NVH and improved ride comfort, because the suspension reacts more quickly to changes in the road surface, allowing the tyres to maintain better contact.

The combination of ceramic brakes and lwt wheels should provide the most noticeable difference.

This was brought to my attention 20 years ago, in a racing environment, and then further confirmed, in road use, by Geoff Turral when he was head of Porsche GB.
I ran a 996.1 GT3 on steels against a 996.2 GT3 on the then Gen1 pccbs and there was a noticeable improvement in road refinement.

For these and other reasons, I’ve specified pccbs since, specifically for road use.

[c4sman]

Thanks, it’s funny as PPCBs give the impression they’re for the ultimate fade free track performance but for many they seem to be best applied for road use to deliver the above benefits. And avoid high replacement cost when used on track meaning track cars are often on steels!

[NDA]

I happened to watch this earlier

https://www.youtube.com/watch?v=RQ6sYbFcdyM

Quite interesting talking about PCCB and going to steels.

[c4sman]

NDA said:

I happened to watch this earlier

https://www.youtube.com/watch?v=RQ6sYbFcdyM

Quite interesting talking about PCCB and going to steels.

Super expensive to replace, but not bad for 22 years and 8 owner car! Who know what it’s been through in those years

[NDA]

c4sman said:

NDA said:

I happened to watch this earlier

https://www.youtube.com/watch?v=RQ6sYbFcdyM

Quite interesting talking about PCCB and going to steels.

Super expensive to replace, but not bad for 22 years and 8 owner car! Who know what it s been through in those years

Yep - a dead clutch at 35,000 miles too.

The steels feel pretty good on a 911 - I am really not convinced about ceramics or indeed centre locks. I just want an easy life.

[c4sman]

Well, I voted with my wallet and bought this new addition to the fleet! PDK CS with PCCBs. Early days but it s blown me away so far (4 days into ownership) and keeping the 997 GTS manual company nicely!

I’m amazed by how well it rides given the handling.

[IMI A]

Stunning.

[TDT]

c4sman said:

Well, I voted with my wallet and bought this new addition to the fleet! PDK CS with PCCBs. Early days but it s blown me away so far (4 days into ownership) and keeping the 997 GTS manual company nicely!



I'm amazed by how well it rides given the handling.

Beauty, congrats.

[guyvert1]

Congrats, looks great... you won't be disappointed , they're brilliant cars and more usable than you imagine !

[c4sman]

Thanks all, it really is a dream come true and so far I cannot quite believe it’s mine when I look at it in the garage. Can’t wait to get to know it better and cover some serious miles and maybe venture on track once it twice to experience its full potential at least once.

[isaldiri]

Cheib said:

Nope but I do have BBS FI-R s and OEM wheels on my 991.2 which I do swap over .might be the placebo effect but I do think there s a very slight difference in how the car rides. Obviously only something you d notice immediately after change and on a road you know well.

They re about half the weight saving of the PCCB s.

it's half the weight saving but as that saving is applied quite a bit further from the centre of rotation, the overall reduction on moment of intertia might well be greater for wheel rims vs brakes. curiously, that also applies to the weight difference between a shiny new and used tyre and while many regularly compliment the 'unsprung weight differential' for improved feel in ceramics vs steel but never negatively comment on a new set of tyres going on.....

[Cheib]

isaldiri said:

Cheib said:

Nope but I do have BBS FI-R s and OEM wheels on my 991.2 which I do swap over .might be the placebo effect but I do think there s a very slight difference in how the car rides. Obviously only something you d notice immediately after change and on a road you know well.

They re about half the weight saving of the PCCB s.

it's half the weight saving but as that saving is applied quite a bit further from the centre of rotation, the overall reduction on moment of intertia might well be greater for wheel rims vs brakes. curiously, that also applies to the weight difference between a shiny new and used tyre and while many regularly compliment the 'unsprung weight differential' for improved feel in ceramics vs steel but never negatively comment on a new set of tyres going on.....

I assumed that the new tyre “uplift” was because the fresh rubber was a bit more compliant.

[993rsr]

Cheib said:

isaldiri said:

Cheib said:

Nope but I do have BBS FI-R s and OEM wheels on my 991.2 which I do swap over .might be the placebo effect but I do think there s a very slight difference in how the car rides. Obviously only something you d notice immediately after change and on a road you know well.

They re about half the weight saving of the PCCB s.

it's half the weight saving but as that saving is applied quite a bit further from the centre of rotation, the overall reduction on moment of intertia might well be greater for wheel rims vs brakes. curiously, that also applies to the weight difference between a shiny new and used tyre and while many regularly compliment the 'unsprung weight differential' for improved feel in ceramics vs steel but never negatively comment on a new set of tyres going on.....

I assumed that the new tyre uplift was because the fresh rubber was a bit more compliant.

I think our friend is meaning the increase in unsprung mass from new tyres is never negatively commented on (he's a cynic )

[ChrisW.]

The new PZero-R seems to test well ... and it's light with a deeper tread than Cup2's ...

Edited by ChrisW. on Wednesday 18th March 18:41