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S2 tyre pressures

pauljmcnulty

pauljmcnulty

Active member
36 front and 44 rear sounds mighty high to me. [8|]

What does everyone else run their tyres at? My van only needs about 50, so 44 seems excessive for a pretty light car with one occupant. Albeit a large occupant. [&o]
 
I thought the handbook says 36psi all round.

I'm running 34 psi all round on my D90s

at 32psi all round I was getting wear on the outside edges
 
The 944 S2 is 18 plus years old, tyres have improved 5 fold, in that time I have played with 26 PSI front and 32 rear on yoks AVS, best I have found is 32 psi cold front and rear. but this may depend on tyre manufactor.
 
ORIGINAL: barrysmith

The 944 S2 is 18 plus years old, tyres have improved 5 fold, in that time I have played with 26 PSI front and 32 rear on yoks AVS, best I have found is 32 psi cold front and rear. but this may depend on tyre manufactor.
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Yup that is what I run on my Lux which has S2 suspension, brakes & wheels. This is with Goodyear GSD3s
 
Different year manuals say different things, but its usually either 2 BAR and 2.5 BAR or 2.5 BAR all around (29 PSI front and 36 PSI rear or 36 PSI all around).
 
The later manuals state 44psi rear for both Turbo and S2 but this makes the rear of the car unbelievably skittish at speed and wears out the centre of your tyres very quickly. Around 34-36 front and rear gives perfect wear and much better ride/ grip.

I think the consensus on the Titanic mail list years ago, was that Porsche increased the rear psi to counteract potential legalities from exploded tyres when running at three figure Autobahn speeds for a looooooong time. This could just be forum gossip though [:D]
 
Could this be a mistake made when theyve converted metric to imperial (similar to that made with wheel nut torque in some manuals)?
 
We've had threads about this before on here - could be worth a search.

I run 38psi all 'round (measured on a separate gauge, not on the gauge on the forecourt air pump as these are notoriously inaccurate) - slightly higher than the 36 usually spoken of as I found it made the car a little crisper and improved the MPG a smidge.

FWIW, that's with the Falken whatever-they-are tyres.


Oli.
 
I'm assuming FK452 or ZE912s Oli :).

My car says 36PSi all round in the filler cap and the same value in the manual. However I am on 17s so that figure sort of goes into the bin, but not quite.

For 17" wheels (Feel free to correct) I believe the forum searches say that 34PSi all round is a happy medium.
 

ORIGINAL: ChasR

I'm assuming FK452 or ZE912s Oli :).
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Probably the first one, thanks!

(Call me controversial, but I can find more interesting things to read than the sidewalls of my tyres ... [;)] )


Oli.
 
Oi![:'(][;)]

This is what happens when you have had a rather rare and forlorn size on a previous car with next to none of the usual (great) suspects available (my Peugeot GTi-6 on standard wheels).
 
Ive been running 29/36 on my 235/45/17s, after trying 36 all around and a number of other variations.
 
ORIGINAL: pauljmcnulty

36 front and 44 rear sounds mighty high to me. [8|]

What does everyone else run their tyres at? My van only needs about 50, so 44 seems excessive for a pretty light car with one occupant. Albeit a large occupant. [&o]
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I think the high pressure relates to driving cars in Germany where they have the Autobahn and therefore cars travel at higher speeds. When a tyre is driven at 150mph compared to 70mph the pressure inside the tyre needs to be increased to enable it to deal with the high speed conditons the tyre is put under.

Some useful info here on the matter http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=72

Edd
 
Isnt it so the side wall flexes less at v high speeds for this is what warms tyres up as well as heat from traction/friction and could cause catastrophic side wall failure.

Lower profile/stiffer sidewall tyres are probably less prone?
 
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