944 REAR TYRE PRESSURES
Discussion
Recently got a 944S2 and was amazed at the recommended rear tyre pressure - 44 psi 
Thats more like motorcycle tyre pressures!! I double checked the owner's book with information on line and they tally up!
Anybody tried them with less to provide a slightly softer ride, maybe more grip?? The rears are 225/50 x 16". Even the recommend front pressures seem high to me, 36 psi. That's more than my other car, a Puegeot diesel.
Thats more like motorcycle tyre pressures!! I double checked the owner's book with information on line and they tally up! Anybody tried them with less to provide a slightly softer ride, maybe more grip?? The rears are 225/50 x 16". Even the recommend front pressures seem high to me, 36 psi. That's more than my other car, a Puegeot diesel.
I have a 1990 S2 and its manual also states 44 psi for the rear. Discussion with other 944 owners shows that the 1989 cars and earlier states 36 rear yet 1990 and after it is 44 psi.
There has been much discussion on the 944 Titanic forum and the consensus is that 44 is too high and wears the centre of the tyre drastically. It was possibly raised to 44 psi by Porsche to cover themselves against high speed blowouts on the autobahn.
I have run at 36 all round for 50,000 miles with even wear.
>> Edited by diver944 on Wednesday 21st May 17:45
There has been much discussion on the 944 Titanic forum and the consensus is that 44 is too high and wears the centre of the tyre drastically. It was possibly raised to 44 psi by Porsche to cover themselves against high speed blowouts on the autobahn.
I have run at 36 all round for 50,000 miles with even wear.
>> Edited by diver944 on Wednesday 21st May 17:45
Much confusion on Porsche tyre pressures.
The 968 manual which quotes tyre sizes of 16" & 17" suggests 36 lb.
to show how silly it all is on 911 Carrera (not turbo) the tyre pressures are quoted at 36lb front 44lb rear.
this has been the same for 1990-2003,,,including 16,17&18" wheels 2& 4wd versions and obviously different weights of all the models..it doesn't strike me as an exact science.
The 968 manual which quotes tyre sizes of 16" & 17" suggests 36 lb.
to show how silly it all is on 911 Carrera (not turbo) the tyre pressures are quoted at 36lb front 44lb rear.
this has been the same for 1990-2003,,,including 16,17&18" wheels 2& 4wd versions and obviously different weights of all the models..it doesn't strike me as an exact science.
I have a 1991 944S2 and my manual states 36psi, which I have always used and had no problems with, even at really high speed :-
www.pistonheads.com/gassing/topic.asp?t=38947&f=48&h=0&hw=speed
Andy
www.pistonheads.com/gassing/topic.asp?t=38947&f=48&h=0&hw=speed
Andy
Thanks for the advice so far - 36psi sounds more like it. However, any high speed cruising on German Autobahns would probably justify raising this, as mentioned.
The main problem was that the supply at my local Esso garage (free air
) struggles to get the tyres up to 44psi!! New compressor required methinks.
The main problem was that the supply at my local Esso garage (free air
) struggles to get the tyres up to 44psi!! New compressor required methinks.
Agree its very difficult to see the logic in Porsche recommended tyre pressures - on the 993 there are different rear pressures for each optional size. With 285/30/18s the recommended 44 wears out the centre, but I've just checked my PZeros after running 5 months on 40 rear and the centre is less worn than the edges (nothing to do with Bruntingthorpe!). So I don't think they are far off, although for track days you need to do hot pressures of about the same value rather than cold.
Cheers, Maurice
Cheers, Maurice
clubsport said: Get yourself a digital guage,the garage ones are allowed to be up to 10% out which is no use if you have decent tyres on a decent car.
Do Not get a digital guage - problem with them is that the only take one reading (if you dont put the guage on absolutely right first time then the reading will +/-) as they dont continuously sample, a GOOD and i repeat GOOD analogue guage is much more accurate, and easier to work with.
Probably cost you around 50 to 70 notes from demon tweeks
ive posted a thread on the evo forum about tyre pressures, basically ive been experimenting on the 968 and set it down to 26 psi all round
as suspected all the comments told me that blowouts are much more likely and that the car must feel like porridge, thing is i dont know whether its my driving or the roads i use but the car feels marginally heavier on its feet but nothing really detrimental, the gain is in straight line tracking (weird), compliance and that feeling of initial/fingertip grip that was lacking before where it felt like i was bouncing from 1 tarmac dimple to the other (probably an exageration)
i suspect the rears should be a bit higher becuase a 255/40 has quite a high profile and that sidewall flexing is more prominent, will try a 28FR/30R setting and see if its a better compromise
>> Edited by CoupeMan on Thursday 22 May 16:52
as suspected all the comments told me that blowouts are much more likely and that the car must feel like porridge, thing is i dont know whether its my driving or the roads i use but the car feels marginally heavier on its feet but nothing really detrimental, the gain is in straight line tracking (weird), compliance and that feeling of initial/fingertip grip that was lacking before where it felt like i was bouncing from 1 tarmac dimple to the other (probably an exageration)
i suspect the rears should be a bit higher becuase a 255/40 has quite a high profile and that sidewall flexing is more prominent, will try a 28FR/30R setting and see if its a better compromise
>> Edited by CoupeMan on Thursday 22 May 16:52
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