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Helpful ReplyHot!981 Cayman S Geometry & Michelin PS4S N0 tyres

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AndrewCS
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2017/12/12 18:23:15 (permalink)

981 Cayman S Geometry & Michelin PS4S N0 tyres

20" wheels and PASM ... 
 
Fitting a set of Michelin PS4S tyres followed by a four wheel alignment soon, does anyone have the standard settings plus advice on alternatives ?
 
Primary use is rural A & B roads plus a few trackdays.
 
Thank you. 
post edited by Andrew_CS - 2018/03/01 11:41:37

Andrew
981 Cayman S PDK
Aberdeenshire (R2)

Previously
Cayman R Manual


MrDemon
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Re: 981 Cayman S Geometry ? 2017/12/12 20:20:04 (permalink)
do you have any issues ? it's very hard to talk about alternatives if you are happy how the car is already.
 
you will like PS4S though, I have 2 cars on them, had zero issues in the snow.

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AndrewCS
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Re: 981 Cayman S Geometry ? 2017/12/12 22:08:43 (permalink)
No issues, just looking for background data in preparation for what the alignment shows. I am expecting the alignment to be slightly out from standard given 4k since collection late July. 
 
I have assumed that the alignment was `in spec` back then although the geometry was not checked on the OPC`s rig, the 111 point check covering only visual inspection in this regard. 
 
Perhaps I`m over thinking things ... again 
BJ Innes
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Re: 981 Cayman S Geometry ? 2017/12/13 10:56:28 (permalink) ☄ Helpfulby Andrew_CS 2017/12/13 11:34:15
Andrew,
 
I can guarantee your wheel alignment will be skew-whiff at the moment. If it's not, it'll be the first time in my experience.
 
You'll not get much deviation of adjustment from the pre-programmed Porsche settings on the Hunter 4-wheel laser kit for your 981CS. My advice is, max-out the slots on the front top strut mounts to give as much negative as you can get. See photo of my 718. Don't heed resulting red figures. No harm will arise. Porsche always dial-in gobs of understeer in the pre-programmed settings so as to limit the amount of negative camber. Set the front toe to zero.
 
On the rear suspension, you'll not get much adjustment on the eccentrics to deviate greatly from the pre-programmed settings. As a guide I would suggest around 2.0 degrees negative camber if you can get it, and total toe-in values somewhere around 0.12' - 0.16'.
 
Wheel alignment on the stock 981 is a fine tuning thing only. Every car has different tolerances of adjustment in my experience of Caymans, so make the best of what you've got.
 
Brian                

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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

ralphmusic
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Re: 981 Cayman S Geometry ? 2017/12/13 11:08:48 (permalink) ☄ Helpfulby Andrew_CS 2017/12/13 11:34:34
^^^^
plus ask when their set up table/ramp was last certified as level and to what degree of accuracy. If the table/ramp ain't flat, the settings will be out.
 
Also make sure castor isn't too far different side to side, you can get some odd sensations if one wheel's centre is much behind the other.

Modified Reg - Asst RS
R15 Devon
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ralphmusic
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Re: 981 Cayman S Geometry ? 2017/12/13 11:08:57 (permalink)
^^^^
plus ask when their set up table/ramp was last certified as level and to what degree of accuracy. If the table/ramp ain't flat, the settings will be out.
 
Also make sure castor isn't too far different side to side, you can get some odd sensations if one wheel's centre is much behind the other.

Modified Reg - Asst RS
R15 Devon
12 - RSRTC
AndrewCS
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Re: 981 Cayman S Geometry ? 2017/12/13 11:33:52 (permalink)
Thank you all ... 
MrDemon
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Re: 981 Cayman S Geometry ? 2017/12/13 12:13:19 (permalink) ☄ Helpfulby Andrew_CS 2017/12/13 12:33:26
I would stay stock geo if you are happy with how the car drives and tyre wear.
 
hence my 1st post asking if you had any issues ;-) 

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BJ Innes
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Re: 981 Cayman S Geometry ? 2017/12/13 19:32:19 (permalink)
Andrew,
 
It's all about optimisation. If you are happy with your car as it is then stick to stock settings. i.e. all green on the printout.
 
If, like me you enjoy track driving your car, and can appreciate optimising your car's geometry within the limited adjustments available, then do so.
 
It's a personal choice.
 
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

AndrewCS
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Re: 981 Cayman S Geometry ? 2017/12/13 19:45:02 (permalink)
Aye, sure is Brian ... I`ll see what it is currently set at and then decide. It`ll be `me` that needs the real optimisation !
 
I have never found it to under-steer at all, have had both front and rear `minor moments` but that is not really surprising given our road conditions these past few months (on PZero N0`s). 
 
Thank you. 
BJ Innes
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Re: 981 Cayman S Geometry ? 2017/12/14 15:04:19 (permalink)
Andrew,
 
Be assured, if you carry sufficient speed into a corner on the track, all Caymans will understeer at some point along the radius. Optimising your geo settings help fine tune the "feel" of the car for your preferences.
 
As I said, it's a personal choice.
 
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

AndrewCS
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Re: 981 Cayman S Geometry ? 2018/01/10 23:50:07 (permalink)
PS4S N0 were fitted last Monday, preceded by a Hunter alignment check ... see attached. 
 
Expensive Hunter wheel balancer ... https://www.hunter.com/wheel-balancers/road-force-elite
 
A 160 mile round trip and well worth it for the superb attention from GT Tyres, Forres (no affiliation). 
 
Impressions ... a quieter and smoother ride, smoother steering feel. Parking speed acute lock `tyre scrabble` of the PZero N0`s `gone`.
Edit: PZero N0`s were at 6mm front / 4mm rear after 15k
 
The change in `feel` reminds me of when I put the previous Cayman R on it`s Cup 2`s ... from it`s PS2`s. 
 
Brian ... thank you for the recommendation and company on the day. 
post edited by Andrew_CS - 2018/01/11 13:33:21

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Andrew
981 Cayman S PDK
Aberdeenshire (R2)

Previously
Cayman R Manual


BJ Innes
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Re: 981 Cayman S Geometry ? 2018/01/11 13:56:34 (permalink)
Pleased to assist Andrew. You'll love the PS4S N0's.
 
Also pleased to hear your views on the PS4S N0 running quieter than the P-Zeros. I also found this to be the case on my 718 CS.
 
Icy weather in the Highlands is keeping my 718 CS in the garage. Snow I can handle, ice is not worth the risk. It's the other road users seeking ditches that worries me.
 
I'll be having my rear geo set for a touch more negative if I can get it, when the weather warms up.
 
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

Strasbourg
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Re: 981 Cayman S Geometry ? 2018/09/11 20:01:28 (permalink)
I can endorse the improvement in feel and directional stability after four wheel tracking process by my excellent local Porsche Specialist, Brookspeed, Eastleigh, Southampton. Prior to the re-alignement tyre tread depth revealed rear tyre wear 1mm greater on the offside. New tyres were fitted recently and it was the offside rear wheel that was the most out of alignement. So not only better driving feel but hopefully less uneven tyre wear. 
AndrewCS
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Re: 981 Cayman S Geometry ? 2018/11/01 19:07:48 (permalink)
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
 
I assume that they came with a nominal 8mm and 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. 
imi
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2018/12/03 17:44:37 (permalink)
Andrew_CS
20" wheels and PASM ... 
 
Fitting a set of Michelin PS4S tyres followed by a four wheel alignment soon, does anyone have the standard settings plus advice on alternatives ?
 
Primary use is rural A & B roads plus a few trackdays.
 
Thank you. 


can you post your before and after alignment settings?
 
thx
Ray
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2018/12/03 17:57:45 (permalink)
imi
Andrew_CS
20" wheels and PASM ... 
 
Fitting a set of Michelin PS4S tyres followed by a four wheel alignment soon, does anyone have the standard settings plus advice on alternatives ?
 
Primary use is rural A & B roads plus a few trackdays.
 
Thank you. 


can you post your before and after alignment settings?
 
thx


I too would be interested in the settings as these tyres would be my choice when changing my P Zero's
 
Ray
AndrewT
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2018/12/03 20:12:53 (permalink)
imi
can you post your before and after alignment settings?



I think the before and after settings are shown in the image attached to post #12 above although they’re labelled ‘before’ and ‘current’.
AndrewCS
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2018/12/04 15:10:46 (permalink)
AndrewT
imi
can you post your before and after alignment settings?



I think the before and after settings are shown in the image attached to post #12 above although they’re labelled ‘before’ and ‘current’.




Correct AndrewT ... thank you.
 
In addition, for info ... recent experiences, the second one upholding the positive performance of the PS4S N0.
 
A 950 mile day round-trip `down South` saw averages of 35mpg and 59mph for the 16 hour journey time. A comfortable experience ... the 981`s Sport Plus seats being far improved over same in the previous CR.  
 
 ........
 
Last week`s heavy rain saw one of the highlights of my sixteen month / twelve thousand mile ownership ... 250 `enthusiastic` miles of soaking and well puddled Highland B roads proving an absolute joy to traverse. What a car ... feel - balance - traction were amazing, not a bad soundtrack either !  The PDK in Manual Sport Mode and Rain Sensing Wipers being particularly effective in the conditions ... plus `a shout` for gtechniq, their glass treatment product keeping everything crystal clear (no rear wiper fitted)
post edited by Andrew_CS - 2018/12/04 17:44:23

Andrew
981 Cayman S PDK
Aberdeenshire (R2)

Previously
Cayman R Manual


Ray
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Re: 981 Cayman S Geometry & Michelin PS4S N0 tyres 2019/03/18 19:23:20 (permalink)
Hi Guys,
Just an interesting video on tyres and performance. I am aware that the video is not Porsche dominant but it is informational and subjective like many things in life.
 
https://www.youtube.com/watch?v=3rQoBeUH9hY&feature=em-uploademail
 
Ray

West Yorkshire
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