Tyre Pressures

[Alpine]

I was advised to run at 32psi all round (on standard design 90s)

 

[Guest]

My manual says 36 front and back. Thats what I run and seems ok for me.
This subject has been touched on. I think everyone runs slightly different. So expect different replies.
As long as you are not crazily far from the reccommended pressure, then run which best suits/feel for the car. Check for the way the tyres are wearing then adjust accordingly.

 

[Diver944]

Flaming is right. Up to 1989 the handbook for 16" wheels stated 36 front and rear. After that it is 36 F and 44 R.

I ran mine at 44 rear for a while and the handling was awful round corners and the tyres wore unevenly in the middle of the tread. 944 folklore (or rumour) seems to agree that Porsche upped the pressures at the rear to ward off any legal action from high speed blowouts on German autobahns.

I run 34F and 36R on my '90 S2 and after 70k miles (and several sets) my tyres wear nice and even

 

[Richard Savage]

David - I would agree with the previous statements. Set the pressures to what 'feels' right but be guided by that stated in the Handbook. Then, examine the running surface of the tyres regularly to check that there is no uneven wear due to over / under inflation.

R.

 

[dseume]

Sorry, I should have remembered to check for previous threads on this topic, but thanks for your comments - quite illuminating as well as reassuring. I have just checked some earlier posts as well and, all things considered, I shall drop mine back to 34/36 in the morning and take it from there.

 

[mik_ok]

I 've only had the car 6 months, but I too thought "what excrement" when I read the figures on the fuel cap.

Set them to 33/35 myself, and subsequently had 34/36 recommended by the (semi) local specialist.

 

[vitesse]

I've used 36/36psi for the 924S(which after all is really a944 but lighter and quicker),the 36 at the front keeps the steering lighter(for my wife who drives both porsches on a daily basis).Seems to be a sensible compromise.

 

[Diver944]

What size wheels are you on Vitesse? Because the 944 Lux had 15" wheels with 195/65 tyres on the front and the handbook for those is 29F and 36R.

We're talking about a much heavier S2 here which is on 16" wheels with 205/55 tyres and I'm just a little suspicious that your 924S could be running much too high a pressure on the front [&:]

 

[mik_ok]

ORIGINAL: VITESSE
the 924S(which after all is really a944 but lighter and quicker)

[]

ORIGINAL: Diver944
What size wheels are you on Vitesse? Because the 944 Lux had 15" wheels with 195/65 tyres on the front and the handbook for those is 29F and 36R.

Peter Dron ran a 944Lux as a long term test for FastLane mag in the mid-80's. It was his writing all those years ago that sold me on a 944 []

I remember him slating the recommended pressures, and playing around until he reached a balance he was happy with. From memory (and this is 20-odd years of "from memory" [] ) he ended up at 32F/34R. Can't remember if this was in isolation, or with some confirmatory input from the much respected Mark Hales (who was dep ed at the time).

 

[vitesse]

Thanks for your concern and interest.To be honest I have never carried around in my head the tyre sizes so will report back tomorrow after I have checked tonight.It's only my daily driver(the BMW)that I bother about memorising,Suffice to say we have run a924 then924S since 1985/6 and other poster's are right to say that they check tyre wear patterns.The fronts on the 924S have & are wearing very evenly and whilst they are only lowly Firestones,the essential neutral handling characterics of the 924 coupled with the speed my wife enjoys being driven at(through bends-she's happy upto around 100mph on straights)means that the lighter steering gives an attractive drive.My previous day car,a Rover Vitesse sport Turbo chipped& boosted to 250BHP needed more rubber so I fitted 235ZR45 17's to the standard alloys that come with that model.Until I tried 42PSI in the fronts it was hopeless,the wheels seemed to wobble around within the tyres.Incidentally,the starting point for a suitable pressure was to look at similar cars with that size tyre fitment,in this case a BMW.I then lowered the pressure a bit at a time with experience,how it stopped in the wet,amount of torque steer etc.

 

[vitesse]

You are quite correct,the tyres are 195/65-ZR 15's and yes the tyre pressures should be 29F-36R but it seems Ok at 36/36.Again I run the 964 at different pressures to those given on the engine compartment,the rears give a more comfortable ride for day to day driving onA & B roads set at 40psi.

Regards,
Colin.

 

[NeilW]

I've stuck with the 29F/36R that the label on the petrol filler cover states. I realise that this would probably have been aimed at the original 215/15 tyres and not the 205/225 D90 combination that I now have, but it certainly works well.

 

[vitesse]

Eventually I had to reply to your pick up on a 924S:You must be aware that the Official Porsche PET system starts each 924S part no with "944"[]

 

[Guest]

Cheers matey. The tyres I've got are the correct size, the wheels are 7x15 front and 8x15 rear, they're original Fuchs alloys and the added bonus is that they're lightweight alloys.

 

[Fen]

If they're 15" they are also worth quite a lot as they are a popular size for racers and concourse puffs on early-70's 911's

 

[Fen]

Start around 35psi all round and have a tweak to see what suits you. Probably somewhere between 34 and 36 wil be what you decide.

 

[Guest]

Front 225 50 16...33psi
Rear 245 45 16...36psi

 

[944turboS]

As Fen says around 35psi will be right, the 968 recommended pressure for 17" rims is 36psi all round.

 

[rpjg_1975]

I'm running mine at 34psi and they're on the same size tyres

 

[northo]

All around?

I've been running mine at 36 (front) and 44. Was a little bit twitchy in the soaking wet yesterday at Knockhill!