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My new 982 718 Cayman S PDK

penguinman said:
I can add to Steve's experience with PS4S's, fitted to 981S, at Brands Indy circuit, dry but a little cold, back in late March. Totally agree, after a couple of warming laps (me, tyres, brakes), they felt instantly better than the P Zero N1's. Turn in particularly good, and I was a happy panda. But, Like Steve, after 4 or 5 quicker laps, they went off almost instantly, like a switch. Turn in grip lessened, and slidey mid corner similar to Pirellis.

I started on 30psi all round cold , and checked on coming in they were over 40. Reduced to 37 all round hot, went out later and had same experience.

On GP circuit next week, be interesting.
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why did you only reduce to 37PSI !

I start out on about 26psi, any lower can ruin your tyre, then only do 2 laps and bleed down, then another 4 and bleed down, and that's normally that. I then pyro to fine tune to try and get and even temp across the tyre. any way PS4S is a road tyre and why it's so good on the road/and wet track is it's very easy to get heat into it for road use, As always choose right tyre for the job which means for a dry track the Cup2 which takes 2 laps to get to temp.

Most road tyres will not do more than 4 or 5 laps, my P zero's went off in 2 laps when I used them I gave up and went home !!!

5 laps is quite good imo if you are on it.

I ran Dunlop Race MAxx at Spa It would only do 1.5 laps before going off, the ****test track tyre ever and were sitting at 65 degrees+ I have ran PS4S all winter on the road and they have been amazing tyres, I have 2 cars on PS4S and 2 on Cup2's.

Always have 2 bleed down sessions as if you get them too hot they will heat cycle and go off 1/2 worn making you wonder why on tyres with 4mm tread why you are unsteering every where.

 
Interesting stuff Mr D.

I'll take heed on the pressure bleed down process at Knockhill in July. Provided it's hot and sunny........[;)]

Brian

 
I can tell you that as soon as it poured at Blyton my almost bald front nearside PSC2 wasn't worth trying to work with.

The front pair are now replaced, but it was a false economy trying to make their swansong a dry (joke) Blyton .... at least I took the instruction and learnt the lines and am now ready for next time !

With PSC2's I also start at 26psi ( the TPS monitoring throws a wobbler at less) and end up taking up to 10psi out in stages.

 
As previously mentioned, I have a full front and rear brake pad service, including brake fluid change, coming up in a couple of weeks. After 12400 miles and 5 track days it's now time to do this.

987 brakes are currently a topic elsewhere on this forum, so by way of illustration as to how the braking performance has evolved and improved from my previous 987 CR, I have a photo below of 987 CR front pads on the left, with 718 CS stock OE pads on the right. The difference is significant.

The extra swept area of the 718 CS pads is plain to see, and illustrates just how the braking performance has improved from the 987 to 718 models. For serious track day drivers, a 718 fitted with say, Pagid or Brembo pads, and steel braided hoses, as JMT has already done on his 718, will provide ample braking performance. Should the owner then subsequently decide to remap the ECU and and boost the power and torque north of 400bhp and 500nM, the standard callipers and discs of the 718 CS/GTS should be more than adequate for the task.

Brian





 
Very surprising Brian - more than a 50% increase in swept area I'd say - and just illustrates brake development over 10-years+.

All good news of course, as it means that there's plenty in hand for future development.

Jeff

 
I haven't owned a 981 S to compare front brake pads sizes with the 987/718, but before long I'm sure someone on this forum will chip-in with relevant information.

Porsche R&D apply "continuous improvement" to chassis and brakes on all their models. I would expect the 718 CS/GTS brakes to be a further step up from those on the 981CS.

Brian

 
Thank you Ralph, for your comprehensive brake part list. I knew I could rely on you to provide the necessary data.[;)]

As the author of this thread, my purpose is to compare impressions and experiences of my current 718 CS PDK with that of my previous 987 CR manual. The comparable track day braking performances of the two models was one of the main differences I noticed straight-away when moving on to the 718 CS. Although I have previous experience of driving the 981 CS/GTS models, none have been on the track. My new 718 CS delivered a quantum leap in braking performance compared to my CR, despite the latter being fitted with uprated Brembo pads and Goodridge braided steel brake hoses.

Brian



 
BJ Innes said:
Thank you Ralph, for your comprehensive brake part list. I knew I could rely on you to provide the necessary data.[;)]

As the author of this thread, my purpose is to compare impressions and experiences of my current 718 CS PDK with that of my previous 987 CR manual. The comparable track day braking performances of the two models was one of the main differences I noticed straight-away when moving on to the 718 CS. Although I have previous experience of driving the 981 CS/GTS models, none have been on the track. My new 718 CS delivered a quantum leap in braking performance compared to my CR, despite the latter being fitted with uprated Brembo pads and Goodridge braided steel brake hoses.

Brian
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As you know I smoked a set of 718 GTS brakes and set them on fire when I tested it lol

I think it's under braked, non of my own 5 cars set on fire on the same test !!!

Although only one other car got to 126MPh which the GTS went to !!!

The thing is the faster the car the bigger the disks/pads needed, they can all only corner the same speed.

So imo they are still too small looking at your picture. the 981 Spyder Size is about right (at a guess they will be the same as my 996 GT3 calipers shown below or very close too it)

as an example here are my R pads VS my 987.2 Spyder pads which use 996 GT3 calipers, the pads much larger then the 718. I'll not show you my new GT3 ones they don't fit on page lol

next issue is pad costs !!! these sizes cost £400 a pair !!! I dare not ask about the massive 991 prices.

pads.jpg


 
I think the 996 GT3 calipers and 350mm set up is mega on my 987.2 car.

Added to which my car only weighs 1260kg also.

I remember instructors reaching for a grab handle at Anglesey lol

Stops quicker than the P1 ;-)

I still have those 340MM disks to go on my R , but I think I am selling it now :-(

 
PS, Endless pads sound the daddy of all pads, but £800 a pair !!! I have yet to try them but only heard the best reports from them, a bit rich for me.

 
On my recent UK tour I picked up a stone chip on the windscreen. Local authorities persist in top-dressing rural roads with gravel chips. It's always a hazard during the summer, and low slung sports cars are particularly vulnerable.

Autoglass are booked on Monday to do the repair. Thankfully it's a repair, and not a windscreen replacement.

Two photos of the damage for your interest. I'll post the repair results later.

Brian

 
That's the tip for the Autoglass techie!

Autoglass charge £160 for a stone chip repair. Following a telephone conversation with my insurance broker, I pay nothing.

Brian

 
BJ Innes said:
That's the tip for the Autoglass techie!

Autoglass charge £160 for a stone chip repair. Following a telephone conversation with my insurance broker, I pay nothing.

Brian
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Brian,

£160 for a chip you get a bag full at our chippie for £1.60, fish are a little more expensive.

Ray

Very good Brian a freebie.

 
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