718 Cayman Tyre Pressures

[Option1]

Hi all

This is my first post...

I have a 718 with 20 inch wheels - 265/35R20 on the back and 235/35R20 on the front. Standard issue Bridgestone rubber from the dealer (unfortunately...)

The manual suggests 33psi all the way round and i have had them inflated with nitrogen (it was £4, so what's the harm!) and it gives a pretty firm ride and not the greatest lateral grip.

I have noticed that under 'normal' driving conditions the tyre pressures quickly rise to 35-36 PSI and on somewhat more 'spirited' driving it can go to more than 40psi... In fact, on a warm day/road... WELL above 40!!!

This is my first car with tyre pressure monitors so i am OBSESSED!!!

I was wondering what pressures you all run and if you have any suggestions/recommendations?

Thanks!

[Twinfan]

I have a 981 but run the 'standard' pressures of 2.3bar/33psi on OEM Pirellis. While not the best tyres in the world, they work fine once up to temp and the car feels good. I don't see any reason to change the pressures away from what Porsche recommends.

[DJMC]

Twinfan said:

I have a 981 but run the 'standard' pressures of 2.3bar/33psi on OEM Pirellis. While not the best tyres in the world, they work fine once up to temp and the car feels good. I don't see any reason to change the pressures away from what Porsche recommends.

Same here. 20" on 981. Goodyear F1 A2 all round. 2.3 BAR = 33psi. Pressure set when cold so of course it will rise as they heat up.

There is something called a "comfort pressure" but I've never looked in to it. No need.

Although Bridgestones are Porsche N marked, I don't think I've ever ever heard of them being fitted to a new car?
Most 718 models with 20's seem to be on Pirellis.

[Maxym]

I use 2.3 bar all round (981 CGTS). The 'comfort' setting - not for mental speeds - is 2.1 all round IIRC.

[Twinfan]

Yep, 2.1bar for the "comfort" setting with reduced top speeds. You need to select this option in the tyre monitoring system if you're running it.

[Bennachie]

You do realise that 70% of air is Nitrogen............................................?







OK, ok. Bigger atoms so less seepage loss etc. Less water vapour................................. significantly less than 1%.........

A good profit generator though...........

[DJMC]

Wait a minute... wait a MINUTE!!!...

...that's THREE 981 owners being nice to a 718 owner!

[Maxym]

DJMC said:

Wait a minute... wait a MINUTE!!!...

...that's THREE 981 owners being nice to a 718 owner!

Yeah well the 982 isn't a bad car you know. Best thing about it over most 981s is the steering - quicker rack and more feel. I even quite liked the engine (lol), though I have to say it wasn't as smooth (at very low revs) or as musical as the F6.

[DJMC]

Maxym said:

Yeah well the 982 isn't a bad car you know. Best thing about it over most 981s is the steering - quicker rack and more feel. I even quite liked the engine (lol), though I have to say it wasn't as smooth (at very low revs) or as musical as the F6.

No... please don't...

Let's get back to tyre pressures. I was just pointing out we all like each other whatever our chosen model!

[Maxym]

DJMC said:

No... please don't...

Let's get back to tyre pressures. I was just pointing out we all like each other whatever our chosen model!

Sorry, I've been dying to stick in my two-pennorth having finally got to drive one...

[arcamalpha]

Comfort pressures will help the ride a bit. On mine comfort pressure is fine up to 100mph. Ample for me (sadly!).

[dreamcar]

Option1 said:

Hi all

This is my first post...

I have a 718 with 20 inch wheels - 265/35R20 on the back and 235/35R20 on the front. Standard issue Bridgestone rubber from the dealer (unfortunately...)

The manual suggests 33psi all the way round and i have had them inflated with nitrogen (it was £4, so what's the harm!) and it gives a pretty firm ride and not the greatest lateral grip.

I have noticed that under 'normal' driving conditions the tyre pressures quickly rise to 35-36 PSI and on somewhat more 'spirited' driving it can go to more than 40psi... In fact, on a warm day/road... WELL above 40!!!

This is my first car with tyre pressure monitors so i am OBSESSED!!!

I was wondering what pressures you all run and if you have any suggestions/recommendations?

Thanks!

I run the tyres on my BGTS (981), same 20” wheels and tyre spec as you have on the comfort rating of 30PSI all round, which Porsche say are good for speeds up to 165mph. These pressures are listed in the technical specification in the back of the book of words. If you do choose to set comfort pressures you need to go to TPMS in the multi function display and check the comfort pressure box so you don’t get low pressure TPMS warnings.

[Pinball]

Mine came with the pressures set to comfort mode. I haven’t changed them yet. The speed limit for comfort is about twice the national speed limit.

[ryanchan]

What happens if you are below 33psi and try to go over 165, is there a speed limiter then?

[JonA65]

Haha. Ultimately I guess the tyre bursts and speed reduces rapidly, self regulating you might say.

[Pinball]

ryanchan said:

What happens if you are below 33psi and try to go over 165, is there a speed limiter then?

No idea. I doubt I’ll try it. Some cars do, I was watching Shmee putting winter tyres on one of his cars a while back and that gave an option to limit the speed based on the tyres. Don’t know if Porsche do this.

[dreamcar]

ryanchan said:

What happens if you are below 33psi and try to go over 165, is there a speed limiter then?

You get a warning in the multi function display.

Edited by dreamcar on Friday 8th June 20:48

[arcamalpha]

I never understand why more pressure is needed for higher speeds. Surely at higher speeds heat and therefore pressure increases beyond normal so if anything lower starting pressures needed..?