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Ray
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/08 19:45:04 (permalink)

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AndrewCS
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/08 23:45:19 (permalink)
In general, yes ... thank you.
 
In detail, not really as this appears to be a `perfect world - conditions` test and not representative enough of the cars - roads - conditions we here drive on.
 
My PS4S`s are now at 10k and 5-6mm, I find them excellent in all conditions and would not change for another brand. Part being that I want to maintain N rating compliance (even though this tyre was not on the original Porsche fitment list for the car). 

Andrew
981 Cayman S PDK
Aberdeenshire (R2)

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Motorhead
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/09 14:05:58 (permalink)
Thanks Ray.
 
I think that tests of this type are very useful and relevant precisely because the tyres are tested under controlled and identical conditions; but as always the results inevitably are somewhat vehicle dependant, in this case a front-engined rear wheel drive car. How well they translate to our mid-engined cars with more rear weight bias and lower polar moment of inertia is open to question, particularly for dry road and wet road handling.
 
Jeff
 

987.2 Cayman S
North Beds (R10 & R24)
BJ Innes
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/09 15:29:30 (permalink)
I agree with Jeff.
 
Although tyre comparison tests are useful for learning about the general grip characteristics of the tyre, the behaviour of the tyre carcass under cornering load conditions is very different between front-engined rear wheel drive cars and mid-engined cars. Completely different dynamics are at play here.
 
Brian  

Nairnshire,
Highlands
Previous:
2007 Cayman 987.1 2.7 Manual.
2010 Cayman S 987.2 Manual
2012 Cayman R Manual
2019 718 Cayman S PDK
Current:
2015 Abarth 595 Competizione 180bhp Manual
718 Cayman GTS PDK

Ray
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/09 15:43:36 (permalink)
BJ Innes
I agree with Jeff.
 
Although tyre comparison tests are useful for learning about the general grip characteristics of the tyre, the behaviour of the tyre carcass under cornering load conditions is very different between front-engined rear wheel drive cars and mid-engined cars. Completely different dynamics are at play here.
 
Brian  


I agree that differing outcomes can result from vehicle to vehicle. But, unless an individual takes a punt at a different set of tyres which have not been tested by Porsche then people could be limited only to the tyres tested by Porsche?
 
Ray

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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/09 16:07:23 (permalink) ☄ Helpfulby Andrew_CS 2019/07/09 19:18:18
I have the following alignment on my 981 CGTS with MPS4S. Felt amazing on my road trip to the Alps last week, loads of grip, balance and confidence, car feels very neutral. I run my tyres at 33psi hot as I find this gives best grip.  I also had fitted X73 rollbars (my car has PASM) and 718 rear brace at the same time as the new alignment. 
 

 
 
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/09 19:44:37 (permalink)
Those settings look pretty much spot-on to me.
 
Brian 

Nairnshire,
Highlands
Previous:
2007 Cayman 987.1 2.7 Manual.
2010 Cayman S 987.2 Manual
2012 Cayman R Manual
2019 718 Cayman S PDK
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2015 Abarth 595 Competizione 180bhp Manual
718 Cayman GTS PDK

Ray
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/25 12:05:18 (permalink)
https://www.youtube.com/watch?v=VpZss_Y_JHc&feature=em-uploademail
 
Hi Guys, Don't know if you have seen the latest tyre review from "Tyre Reviews"?
 
Ray

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AndrewCS
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/25 23:42:20 (permalink)
Thanks Ray,
 
Good to see the `competition` progressing; interesting car on Goodyear`s webpage  
 
Supersport range ... https://www.goodyear.eu/en_gb/consumer/why-goodyear/uuhp.html
 
N  rated ... 
 
EAGLE F1 SUPERSPORT RS265352099YXL | N0EAGLE F1 SUPERSPORT RS3253021108YXL | N0 
post edited by Andrew_CS - 2019/07/25 23:53:08

Andrew
981 Cayman S PDK
Aberdeenshire (R2)

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Cayman R Manual


andrewjb
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/07/30 19:12:26 (permalink)
Just has M PS 4S fitted and alignment done today! car feels lcompletely different! alighnment settings previous were really out!
Rocket_Rabbit
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/08/13 23:46:17 (permalink)
I have done geo on plenty of cars over the years and, unless you've clobbered something, they don't really move.

So either vibrations are moving the adjustment bolts or the metalastics are degrading at a rapid pace!  Or you've whacked something without realising.

Not ideal...
AndrewCS
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/08/21 18:02:07 (permalink)
Recently had a run South .... Aberdeen - London - Bristol - Swansea - Aberdeen ... 1600 miles. 
 
Outward & Return trips ... both ~ 550 miles - 10 hours - 37mpg 
 
Superbly comfortable and with impeccable behaviour in serious monsoon conditions on the return M6 leg, the way we cut through and braked in the standing water was most impressive (MPS4S`s are on 5mm).
 
I think I am correct in saying that a `63` plate CS does not have brakes that `clear` the discs by occasional, automatic brake application ? 
 
Craziest experience / observation was during the serious monsoon ... > 50% of vehicles with no rear lights and > 90% without rear fog lights in near impossible visibility conditions !

Andrew
981 Cayman S PDK
Aberdeenshire (R2)

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Motorhead
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/08/22 08:58:27 (permalink)
Andrew,
 
I'm no brake expert but my understanding of modern ABS systems it that they maintain a small pre-charge to keep the pads in light touch with the discs. Although this has the effect of keeping the discs clear, primarily this is to minimise brake application time in the event of an emergency application. Probably there's an algorithm which detects the time taken to come off the throttle and on to the brake and uses a threshold time below which the system applies max braking force up to the ABS limit since most driver's don't apply sufficient braking effort in the event of an emergency.
 
I'm with you on the lack of - and misuse of - both main driving lights and rear fog lights in very poor driving conditions. Drivers using rear fog lights at night when conditions don't demand it is another pet hate of mine.!
 
Jeff
 

987.2 Cayman S
North Beds (R10 & R24)
AndrewCS
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/08/22 10:33:22 (permalink)
Thank you Jeff ... well put.
 
The way that the car immediately lost speed and remained straight / true, without any lack of feel was extremely reassuring. 
 
Emergency braking ... it was on a Porsche driving day some fifteen years ago that I learned to push the pedal through the floor in order to get the best from the ABS and hence car controlability. Only took me another twelve years to purchase one ! 
 
Lights .... the latest daytime running and dashboard systems have a lot to answer for in not assisting drivers in such poor conditions. 

Andrew
981 Cayman S PDK
Aberdeenshire (R2)

Previously
Cayman R Manual


Motorhead
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/08/22 13:07:53 (permalink)
Agreed on lack of driver assistance Andrew. Neither my Cayman nor my daily drive have auto wipers but I would have thought it a simple matter to link headlight activation automatically with wiper activity, although auto fog light activation could be a bit trickier.
 
One of my long-term pet gripes about Porsche equipment is that auto headlight and wiper functions are costly extras when quite clearly there's a safety benefit from having them, and generally there are manual overrides for those who prefer to DIY.
 
Apologies for wandering way off-topic.!
 
Jeff

987.2 Cayman S
North Beds (R10 & R24)
AndrewCS
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/09/17 21:05:45 (permalink)
Alignment time again, prompted by a 50 mph encounter with a smallish pothole on a dark country lane. Given the rather loud thump I was convinced that the front, nearside tyre had burst and with worse for the wheel and suspension. 
 
Roadside visual inspection revealed nothing sinister and the feel was as was but being 100 miles from home I diverted to a local hotel. Morning inspection revealed nothing more, pressures and wheel bolt torques all OK. 
 
Once at home all wheels were removed and anything that is anything was inspected, nothing found ... thank you Porsche !
 
Not being the first (but by far the worst) pothole experience during the past twenty months and 14,000 miles I am amazed at the durability of these tyres ... thank you Michelin !
 
As can be seen there was a significant affect on the nearside cambers, whether all down to this event though ? 
 
Initial feel on the corrected settings was certainly different, the front feeling much lighter and the rear ... just different. A 100 mile bedding in run home reset the senses well enough 
 
Page 1 - Post 12 shows the settings when last aligned. 
 
.................
 
Wear pattern is even across all four tyres and is at ~ 5mm, looking back in the thread I noted them at 6mm after 6,000 miles ... Specsavers may need a visit 
 
The feel and grip has certainly improved as they have worn down with wet performance simply outstanding.
 
I run the pressures up to 3 psi less than the handbook / sticker plate given that local ambient is rarely at the noted setting condition of 20`C. 
 
 
post edited by Andrew_CS - 2019/09/17 21:11:49

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Andrew
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AndrewT
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/09/18 08:27:45 (permalink)
 
Andrew, It’s very unfortunate that you’ve encountered a pothole. Do you think there’s any possibility that the tyre has suffered damage which is not visible externally?
 
 I ask because my recent pothole encounter didn’t cause a blow out but it did visibly damage the tyre - if my tyre hadn’t split I feel there’s still a chance that the carcass may have suffered internal damage. Anyway, in my case, the Michelin PS2s did enable me to carefully drive the 10 miles home.
 
 

Andrew.
987.2 Cayman S
Romsey, Hampshire. (R17).
AndrewCS
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/09/18 10:30:50 (permalink)
Thank you Andrew, good point. 
 
I can`t discount internal damage but without any external signs and no loss of pressure I have taken the optimistic view that all is well. The garage that did the alignment also had no concerns.
 
I inspect my tyres rather regularly, i.e. prior to any use  hence hope to catch any potential deterioration before escalation.
 
When I had all the wheels off for inspection I noticed that some of the balance weights were starting to deteriorate (rust / loosen). I attended by cleaning and taping over with a mind to a future re-balance ... an opportunity to remove tyre from rim and inspect internally.  

Andrew
981 Cayman S PDK
Aberdeenshire (R2)

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Cayman R Manual


Motorhead
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/09/18 11:10:01 (permalink)
Andrew,
 
Take a look at this video posted by a chap on PH who'd imported a 987 Spyder into NZ and on changing the tyres was informed that the two left wheels were out of true. The damage was not visible without removing the wheels from the car as the faces were unmarked.
 
https://www.youtube.com/watch?v=jDjup27OScM&feature=youtu.be
 
Inner rim distortion - how did that happen..??
 
Jeff

987.2 Cayman S
North Beds (R10 & R24)
AndrewCS
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/09/18 11:40:05 (permalink)
Thank you Jeff. 
 
Pretty sure that mine are quite straight given the checks completed. I did rotate them off the car but maybe need to jack up and give them a spin. 
................ 
Maybe I can sell my spare set of CR / Spyder wheels with Cup 2`s to NZ   

Andrew
981 Cayman S PDK
Aberdeenshire (R2)

Previously
Cayman R Manual


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