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CR to CS PDK


Mk1

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2012 CR manual - 8k in thirteen months ... to ... 2013 981 CS PDK - 4k in thirteen weeks :Banane21:

 

No regrets on the change, what a difference the PDK makes ... :)

 

 

4a.jpg

12.jpg

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Neither daily drivers, fortunate to have the time to get out and enjoy them. The durations / mileages are an indication of the comparison, the 981 being all and more than the CR was, albeit I have not yet had it on track.

 

The CR was my first owned Porsche and whilst superb was for me too singular in it`s application for the roads up here i.e. too stiffly sprung with not enough `feel`. The front end whilst always communicative used to `go light` after a few hours of Highland touring, it also had a tendency to engage the ABS rather readily on the unloaded wheel. Both traits were never a real issue, I kept the front tyre pressures lower than recommended and had the alignment checked. The ABS engagement a condition of the springing and the `fun` road terrain up here.

 

The CS has all the Sport functions apart from PTV, it has improved body rigidity but with more compliance hence improved `feel` ... imparts much more confidence on the roads up here. The PDK allows much easier and safer use of the performance, the car is an absolute, mindboggling joy ! 

 

 

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Tyres ...

 

The CR was on Michelin PS2`s for the road and Michelin PS Cup2`s on the track.

The PS2`s were a fine all weather tyre; even when running at 3mm on the rear throughout last Winter.

 

Ran the Cup2`s for one trackday and ~ 1,000 miles on the road. As expected they are much more compliant and transform the ride. Grip on the dry track is superb, no dramas on the road even in damp conditions. 

 

..............

 

The CS came on Pirelli PZero NO`s ... I had read a lot of `bad press` about them but with little actual description as to what their issue was / is ? Yes, they are all `cracked` between the treads but pronounced OK by the selling OPC, Pirelli UK offered to inspect but with no local access I relied on the OPC`s review. 

 

I have had no issues with these PZero`s and am impressed with their all round performance, especially in the wet.

The fronts appear to be able to last forever, the rears have worn ~ 1mm in the 4,000 miles completed and when due for replacement will cause me a dilemma ?

 

Do I `upgrade` to the PZero N1 and then have to change the fronts likewise or move all to the new Michelin PS4S N0 ?

 

 

 

 

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I hardly ever use the computer systems, generally it is only the oil level but whilst waiting for the level to settle yesterday I found the trip history since it`s arrival with me ... 

 

~ 100 hours 

~ 4,000 miles 

~ 30 mpg

 

Note to self ... must try harder !!!

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  • 1 month later...
On 03/11/2017 at 14:55, Mk1 said:

 

Or move to the new Michelin PS4S N0 ?

 

 

Further to the PS4S discussion in ... http://www.caymanoc.com/forums/topic/1005-tyre-wear/?page=2 ... the full set are now in stock, fitting TBA in the New Year.

 

may :10_wink: report back ... :12_slight_smile:

 

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  • 3 weeks later...

PS4S N0 fitted last Monday, initial impression is very positive ... geometry reset. Still scrubbing them in, 200 miles down with a few more to go.

 

5a5a299815dfd_CSGeometryJanuary2018001.jpg.5cf2177cf105f47367fed9838f006183.jpg

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  • 1 month later...

1500 miles on the PS4S N0`s now, motorway - rural A & B`s - extremely dirty (loose gravel & salt) Highland roads. 

 

As expected, performance is excellent ... difficult to say if markedly better than the PZero N0`s as not yet `pushed` as hard as the PZero`s were. The slighter softer feel / ride does detract something from the overall experience though. 

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  • 2 months later...

4500 miles (total) on the PS4S N0`s ... pushing on reveals superb traction / performance. Assuming 8mm tread depth at new, fronts have hardly worn ... rears down by 1mm.

 

Are they `that much improved` over the PZero N0`s ? ... impossible for my skills to ultimately determine.  

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  • 4 months later...

6,000 superb miles on the PS4S`s, wear as follows:
 
4 6666 4                 Front            4 6667 5
 
4.5 6666 4.5           Rear             4 6666 5
 
A little surprised at the `equal` front to rear wear.
The previous PZero N0`s being 6mm front and 4mm rear upon car purchase at 11k, fifteen months on we are at 22k 
 
Of that 6k, only 1200 motorway miles .... the remainder on Highland A & B`s 
Excellent tyres, thoroughly recommended. 

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On 13/01/2018 at 17:29, Mk1 said:

PS4S N0 fitted last Monday, initial impression is very positive ... geometry reset. Still scrubbing them in, 200 miles down with a few more to go.

 

5a5a299815dfd_CSGeometryJanuary2018001.jpg.5cf2177cf105f47367fed9838f006183.jpg

 

 

interested about the discrepancy of LF and RF camber? (-1.0 and -0.58)

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Re. camber ... numerically a discrepancy but negligible effect overall, given the compromises required to set the rest up.

The camber is outside OEM standard and required use of the slots in the turret tops, not always possible to achieve a perfect `match`. 

 

The `before` settings were after six months / 4,000 miles since collecting the car from the OPC, they do not conduct a full alignment prior to sale, only a visual. The `after` settings were agreed upon after consultation with an experienced (Cayman owner) friend and the non OPC alignment specialist. 

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  • Founder

The amount of negative camber you can achieve does vary from car to car, bit of a shame really.  

 

Also surprised about the equal front to back wear too, mind you it's a good thing and gates that "do I change fronts now too" question I always seem to find myself asking - inevitably the answer is yes and then feel i've wasted a good few mm of rubber! 

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  • 4 weeks later...
  • 1 month later...

What does one naturally do when the weather deteriorates ... give Sport Plus it`s head !

 

Up until now I`ve not used Sport Plus a great deal but with an itch for a possible change of car emerging I decided to explore it further. After an hour`s run over a favourite hill / forest run I was left with both a headache and a severe case of what took you so long 😖 ..😍.. WOW ... it`s so much easier to drive quickly / quicker and reveals yet another superb dimension. 

 

That was last week, only change for today was to switch the Sport Exhaust off ... 100 quieter and more satisfying miles later, new dimension number two ! 

 

In addition one ... yet another shout for Michelin`s PS4S N0`s, they just get better or is that down to me 😉 😁

 

In addition two ... steering feel. Much has / is said regarding the feel of the 981 vs the 987 and the latest 718 (i.e. the 981 is lacking). Having owned a Cayman R and spent many, long hours in borrowed 718`s ... what the 981 has suits it`s demeanour perfectly ! 

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  • 3 months later...

Coolant System Alarm ... unexpected outcome !

 

On a recent late evening run out, Amber alarm ... Coolant System Fault - visit garage.
 
Torch in hand, checked under the car ... no visible leaks so returned home ... without issue.
 
Next morning ... fluid level OK so another check underneath ... again, no leaks but the vacuum hose connection at the nearside PSE valve actuator had sheared ... is this related ? 
 
Discussed / booked in with OPC service dept ... still none the wiser. Come the investigation / repair it appears that the the failed connection causes an open circuit in the coolant alarm system.
 
I have trawled the PET file but have yet to find a visible hardware link between the two systems.
 
The failed connection was due to the actuator port / nozzle shearing from the body, a new actuator was fitted and the original hose reconnected (all covered under warranty). 

 

Advice from `another` ... is that the cooling system valves are also vacuum operated hence the `link` and given alarm indication. 

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  • 4 months later...

~ Twenty months and 14,000 miles on the PS4S`s, now at ~ 5mm all round.

 

Recent alignment (first since tyres fitted) due to nearside hitting a small pothole at 50 mph. Not the first `hole in the time-frame but certainly the most significant in terms of the `bump` experienced. 

 

Removal of all four wheels and inspection of strut top mounts revealed no apparent damage to anything; was pleasantly surprised !

 

Took the opportunity to inspect brakes and remainder of visible parts, apart from some surface rust on some screws / bolts - trim / steering rack mounts all looks good after ~ six years and 29,000 miles. I use the car all year round. 

 

The rear discs are worn more than the fronts, the front pads (~ 5mm) worn more than the rears (~ 8mm),  all are original equipment. Wishing that I had a caliper / micrometer for the discs as I believe that the minimum thickness is 18mm and 26mm. The rears have a small `lip`, the fronts negligible `lip`. The master cylinder level is just above minimum, so much easier to gauge with the trim cover removed, did not look as low when viewed through the aperture. I purposely use the brakes `hard` and in the 18,000 miles of my ownership the `feel` has definitely improved.

 

Alignment print below, significant nearside `action` but unsure if all caused during the recent `hole encounter. Conducted on a Hunter rig that had just been recalibrated, the new software was the seventh generation since the car was last aligned. The geometry hardware reset without any issues / complaints. 

 

Tyre wear is extremely even across all four units. I mostly run the pressures lower than the OEM setting of 2.3 bar / 33 psi as this is for an ambient of 20`C / 68`F , don`t see that too often up here.  The technical rule of thumb says that for every 10`F the pressures change / adjust by 1 psi ... works well for me. 

 

 

 

 

CS Geometry Sept 2019 001.jpg

Edited by Mk1
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