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Tyre pressure

W

Worsey

New member
Like buses, my posts are all coming at once [:D]

Just had some new rubber on the rear (fronts to follow next month) and they've been inflated to handbook pressure of 44psi. Good god I can feel every lump, bump, nook and cranny (Manx roads not great either).

Was thinking about dropping it to 40psi in the hope it'll softehnthe ride a smidge, and just wondered what everyone else is running at.

PZero Rosso's btw. Bit noisy but seem ok so far.

Cheers
Lee
 
Hand book pressure of 44psi? Most hand books suggest 29psi front and 36psi rear (2bar & 2.5bar).
 
Is there a difference for differing wheel sizes?

ISTR that 17" wheels are 36 all round?

I run 32F and 34R on 17" wheels but don't know why. I run my 16" track tyres at these temps too when hot (have never really played about with the pressures much) but more than happy to listen to those who may know better.

Anyone got a definitive answer, I know some people claim 1-2psi either way makes a massive difference but I'm not so sure my bum dyno is that sensitive.
 
32F 34R is a good start I'd say. 44 is way too high.

Dave - try fiddling about with tyre presures on the track - I'd suggest you'd be surprised how much difference a few psi makes at one end or the other.

FWIW I run 32 F/R on 225/45/17.
 
Ta Ed, was probably you I was listening to then as 32F is 225/45/17 and 34R is 245/40/17.

Will have a play about next year when the weather is good enough to lean on the tyres a bit more.
 
I was in line for air machine behind 996 turbo. Was in the van. But he put 56psi in his!! Must off wanted less traction

Generally the lower the profile the more psi on wheel size changes I ran 36 psi in my 18" and there seem to wear evenly
 
I don't think the profile really matters, it's the weight of the car that matters, isn't it?

56 is dangerously high. 44 is way too hard. I dropped mine from 36 a corner to 32 and it makes a huge difference to the ride (to help my tired old M030s).

Russ
 
The manual for the MY 90 944 S2 states 2.5 bar front/3.0 bar rear.

I've always considered it a misprint as the MY 89 and MY 91 manuals say 2.5 front/2.5 rear. The workshop manual gives the pressures for all 3 model year S2s as 2.5 front/2.5 rear.
 
I dont think its a misprint: they changed their minds and its in manuals which predate the S2 also.
 
My S2 handbook says similar up in the 40+psi but I did once find a Michelin guide for Porsche fitted tyres, though cant find it again I am sure for the 944/968 on 16/17" wheels it stated 36psi all round and I have had mine set to that for years as 40+ psi was just so uncomfortable
 
I thought it might be a mix up as I was at work at the time and had to ring home and get the wife to look in the Driver's Manual, so I checked myself last night.

P99 & 100 (depending on whether it's a non sport chassis or sport chassis)

2.5 bar F 36psi
3.0 bar R 44psi

Either way, I'll be dropping it down a bit until I find something comfortable.

Thanks for the responses anyway chaps, useful as always.
 
Id be interested to see the pages when you have a minute, along with the first page which has the part number on it.
 
Ah, the old tyre pressure debate again...

FWIW I run 36 all round in mind and I am fairly sure that is what my S2 ran too. I am fairly sure this is what one source said (the manuals) but it does seem to be varied to say the least. It is also what one of the ex-owners of my car recommended who runs a 944 outfit :).
 

ORIGINAL: 944 man

Id be interested to see the pages when you have a minute, along with the first page which has the part number on it.
Click to expand...

Sure, I'll bring it in tomorrow and scan the relevant pages.
 
I too run 36psi all round. Actually 37psi for ease because thats the limit for my '250psi' inflator...
 
36 all around on my S2. I did try 44 on the rears for a while (as per my owner's manual) but the rear would tend to crash and skip sideways over the bumps so common on typical British B roads. I therefore went to the 36 PSI / 2.5 bar all round as specified in section 44.01 in volume III of the 944 Workshop Manual. The rear is much more stable at those settings.
 
Found the link to the website for Michelin recommended tyres and pressures for Porsche sorry its the Swedish site but the search still shows in English
http://porsche.michelin.se/?news=porsche-tire-fitment-guide
 
Just to be different I rune 2.25B front and 2.5 rear.

I played around with them quite alot with the 2.5 and 2.5B all round felt best to me but with the 2.7 on 7x 16 and 8x16 rims seems better with a little less in the fronts
 
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