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APL911
Spa-Francorchamps


Joined: 15 Aug 2017
Posts: 297



PostPosted: Tue Jan 09, 2018 6:43 pm    Post subject: Tyre pressures adjusted. Holy Christmas what a difference! Reply with quote

Just checked my tyre pressures after having my geometry done a few weeks ago.

They were at 40f and 48r!

Dropped to 32f and 34r and WHAT AN IMPROVEMENT!!!

I was quite worried about my car, finding it very jittery, bouncy and tale happy.

Now it’s sweet as a nut.

Check your pressures if you’re a noob like me!
 
  
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911TEL
Barcelona


Joined: 29 Oct 2007
Posts: 1334
Location: Inverness and Highlands

2011 Porsche 997 Turbo S

PostPosted: Tue Jan 09, 2018 6:52 pm    Post subject: Re: Tyre pressures adjusted. Holy Christmas what a differenc Reply with quote

APL911 wrote:
Just checked my tyre pressures after having my geometry done a few weeks ago.

They were at 40f and 48r!

Dropped to 32f and 34r and WHAT AN IMPROVEMENT!!!

I was quite worried about my car, finding it very jittery, bouncy and tale happy.

Now it’s sweet as a nut.

Check your pressures if you’re a noob like me!


Adjusted for temperature also?
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 13991
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Jan 09, 2018 7:25 pm    Post subject: Reply with quote

Those new pressures you've applied are well under. Difference in which way? Bet it feels like a soggy sponge on a waterbed now.
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APL911
Spa-Francorchamps


Joined: 15 Aug 2017
Posts: 297



PostPosted: Tue Jan 09, 2018 7:33 pm    Post subject: Reply with quote

Are they? I’ve been reading arguments all day on tyre pressures and the consensus seems to be around 32f and 36r for 1/2 load.

This also corresponds to what the guys at 911v told me (if I remember right) Question

It just feels less jittery and bouncy now. Not soggy at all.

What are you running? You have mentioned not liking your new tyres recently for similar reasons haven’t you?
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 13991
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Jan 09, 2018 7:35 pm    Post subject: Reply with quote

Err.....no. I'm not keen on my fronts as the grip is too good. I'm running 36/44 as stated by PORSCHE.
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APL911
Spa-Francorchamps


Joined: 15 Aug 2017
Posts: 297



PostPosted: Tue Jan 09, 2018 7:44 pm    Post subject: Reply with quote

Yeah, I’m aware of the Porsche stated figures.

Has anyone else tried lower pressures on here? Or am I off my rocker? Laughing
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 13991
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Jan 09, 2018 7:47 pm    Post subject: Reply with quote

Some folk run lower to have a softer ride, when in reality they're compensating for the stiff suspension by making the tyres less stable.
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EGTE
Imola


Joined: 06 Jul 2015
Posts: 799



PostPosted: Tue Jan 09, 2018 8:30 pm    Post subject: Reply with quote

I use 32/40 psi to 'compensate' for my crappy Exe-TC 3-ways Very Happy

Some Indies advocate as low as 28/36, I believe, but don't tell Alex whatever you do! Grin
 
  
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5146
Location: Brighton


PostPosted: Tue Jan 09, 2018 8:34 pm    Post subject: Reply with quote

Tyre pressures should be set from memory at 20 degrees tyre temp .. so to be spot on a road test then adjust them .

I would agree with say 3 psi lower but more than that and i feel , although i could well be wrong , that you will get uneven tyre wear .. that would be rather expensive .

I can say from experience that low tyre pressures can make a car feel anything from excellent to unstable .. i guess there is a sweet spot but either way then close to the original pressures is what i would have to recomend .

I work in bar so depending on what wheels / tyres you have fitted it should be either 2.5 bar or 2.5 front and 3.0 rear , your original setting would seem to be wrong and a geo should be done with correct tyre pressures .. its kinda basics 1 O 1 on a geo adjust to have correct pressures .

No offence young man.. id hate to cause that .
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APL911
Spa-Francorchamps


Joined: 15 Aug 2017
Posts: 297



PostPosted: Tue Jan 09, 2018 8:43 pm    Post subject: Reply with quote

None taken at all. It’s why I post on here.
I’ll have a longer drive at the weekend and see how I get on.

Maybe they are a bit low. I’ll have to buy a couple of bags of air to put back in them... Question it does feel so much nicer though...
 
  
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chriscoates81
Suzuka


Joined: 17 May 2013
Posts: 1112



PostPosted: Tue Jan 09, 2018 8:46 pm    Post subject: Reply with quote

Of course who's to say whether you're pressure gauge is right? (just to throw that in there Smile.
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crash7
Nürburgring


Joined: 28 May 2011
Posts: 487



PostPosted: Tue Jan 09, 2018 9:40 pm    Post subject: Reply with quote

32/34 hot - Yoko recommend not going above 34 with AD08R.

44 for the rear is laughable, that would be circa late 40's hot!! - Porsche recommended this 20 years ago based on 20 year old tyre technology!

Apart from Alex who quotes 36/44 as gospel and all but attacks everyone who dare oppose it, I know nobody who runs this high! - Tyre technology has come on a long way since 1999 when the 996 was designed.

Porsche themselves now recommend 31/34 on the 991, apart from if your regularly going over 160mph where it's 31/39.

Regardless of how strong the opinion by some, do what feels good for you Thumb
 
  
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P911X50
Monza


Joined: 03 Jan 2017
Posts: 206
Location: Hertfordshire


PostPosted: Tue Jan 09, 2018 10:26 pm    Post subject: Reply with quote

Crash, what pressures do you use
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 13991
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Jan 09, 2018 10:26 pm    Post subject: Reply with quote

crash7 wrote:

Porsche themselves now recommend 31/34 on the 991, apart from if your regularly going over 160mph where it's 31/39.


That's for winter tyres on basic alloys. Full load on 20" alloys is still 36/44.



I've driven mine on the odd occasion with low 30s in them (not by choice) and felt like some Jap drift king.
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911TEL
Barcelona


Joined: 29 Oct 2007
Posts: 1334
Location: Inverness and Highlands

2011 Porsche 997 Turbo S

PostPosted: Wed Jan 10, 2018 1:08 am    Post subject: Reply with quote

I set mine as advised in the Cars handbook ... set at 20degrees

RTFI......... Very Happy
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LOJO
Österreich


Joined: 21 Jun 2003
Posts: 957
Location: Bucks


PostPosted: Wed Jan 10, 2018 7:31 am    Post subject: Reply with quote

I have always enjoyed harder tyres than recommended, until I got my 996. After loads of experimentation I do 34 / 36 on my car. I think 44 is shockingly hard and costs you loads of grip, especially in the winter!!
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asterix_the_gaul
Suzuka


Joined: 20 Dec 2008
Posts: 1073
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Wed Jan 10, 2018 7:45 am    Post subject: Reply with quote

'These tyre filling pressures apply only to the tire makes and types approved by Porsche.'

I.e. If you are not running n-rated tyres different pressures may be applicable..
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LOJO
Österreich


Joined: 21 Jun 2003
Posts: 957
Location: Bucks


PostPosted: Wed Jan 10, 2018 9:55 am    Post subject: Reply with quote

asterix_the_gaul wrote:
'These tyre filling pressures apply only to the tire makes and types approved by Porsche.'

I.e. If you are not running n-rated tyres different pressures may be applicable..


Slightly different point, but do agree with others on this site that the whole N-thing is garbage - a 'system' whereby manufacturers pay Porsche for them to 'test' their tyres and then 'specify' them. Seems very like 'cash for access to the market'.

But I do agree that tyres pressures could vary - depending on the roads, type of use, weather, temperature, etc. People who have never been involved in the racing scene will probably be surprised to realise that racing tyres are pumped as low as possible/permissable - for maximum grip.
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 13991
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Jan 10, 2018 10:09 am    Post subject: Reply with quote

And the fact they get seriously hot and therefore increases the pressure dramatically whilst on the track!
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DerbyJim
Hockenheim


Joined: 25 May 2014
Posts: 727
Location: Surrey


PostPosted: Wed Jan 10, 2018 10:23 am    Post subject: Reply with quote

crash7 wrote:
32/34 hot - Yoko recommend not going above 34 with AD08R.



You use Yoko AD08Rs on your Porsche? How do you find them in comparison to, say, Michelin Pilot Sports?

I have the AD08Rs on the Lotus, absolutely love them and was wondering if I could go that way with the Porsche as well!
 
  
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