Tyre pressures

[rav]

Probably been discussed to death somewhere, but what tyre pressures should i be running on my 1986 944 turbo?

I am running 16" turbo teledials with Continental 205/55 and 225/50 rubber.

Car is used for normal 'enthusiastic' road use.

 

[robwright]

It should be in the petrol flap mate. 29 front and 35 back. PSI of course not bar []

 

[Hairyarse]

Hi Rav I've got D90's on my S2 and I think the same tyre sizes. I've only had it a week or so but pumped them up last night to what it says in the handbook, 36 psi front and 44 psi rear. Seems ok so far Cheers Andy

 

[Lowtimer]

They raised the quoted rear tyre pressure to 44 psi suddenly one year while making no changes to the car. The general view is that this change was a backside-covering exercise based on prevention of blowouts at continuous 160 mph runs on the autobahn. For my taste 35 is a lot better. At 44, the car skips about a bit and I believe has poorer traction at 44, plus it is reputed to wear out the crowns of the tyres. I too put mine up to 44 when I got the car (late Turbo), spent a week thinking "this is a bit grim" and put them back to 35 again with great relief. RAV's being an early car will have 35 in the book for the rears.

 

[rav]

Thanks for the quick replies. I should have seen the number in the petrol flap, i seem to always be filling the car at the moment. A trip to Shell last night and £40 worth of V-Power showed little/no movement to the petrol gauge. Lowtimer - i will check the pressures in my tyres tomorrow and set as you have suggested. I have been running 36 rear and 29.5 front but the car feels strange. I will re-check tomorrow and let you know how i get on.

 

[Hairyarse]

I did think it was unusually high tbh, never had a car with 44 psi before! Guessed I'd give it a bash and see what it handled like but to me sounded like a pressure which would wear out the centre of the tyres too quickly

 

[Hairyarse]

ORIGINAL: rav A trip to Shell last night and £40 worth of V-Power showed little/no movement to the petrol gauge.

Mine was the same Rav when I bought the car last weekend. Rob looked at the sender in the boot and just checked the wires were connected properly (with an official 'wiggle' of them[]) It's worked ever since!

 

[spyro_x]

ORIGINAL: rav A trip to Shell last night and £40 worth of V-Power showed little/no movement to the petrol gauge.

Or the fact these things have 80 litre tanks! That's a tonne today and probably about £150 this time next year! Worth every penny in my book though!

 

[Lowtimer]

Hi, Rav You may have misunderstood me. As Rob said, 35 or 36 Rear, and 29 or 29.5 Front is the 'early' book figure and is a decent enough set of numbers. It is the high 'late' book figures you want to be wary of. I was really addressing Hairy with that comment. In what way does your car feel peculiar?

 

[robwright]

Precisely does it wander, lurch or wallow about. Another potential ARB problem?????

 

[jasonp]

i always go 36psi back and front,

 

[rav]

ORIGINAL: Lowtimer Hi, Rav You may have misunderstood me. As Rob said, 35 or 36 Rear, and 29 or 29.5 Front is the 'early' book figure and is a decent enough set of numbers. It is the high 'late' book figures you want to be wary of. I was really addressing Hairy with that comment. In what way does your car feel peculiar?

Lowtimer -> The car really drives and handles differently on these 16" wheels after driving it for a year on 17" wheels. I would say its more go-cart type handling now - and a much smoother ride with less tram linging and pot hole bounce. I thought that the tyres were a little too full though as the car was skittish on the road. This maybe due to the decreased footprint of the rear tyres. I will try again with the pressures that you and the others who kindly responded have sugested. 36 rear 29 front and see how i get on over the weekend. I will also officially wiggle the sender wires too, although the problem lies more with how much tax the government are charging on fuel at the moment.

 

[Alpine]

34 psi all round for D90s

 

[Hairyarse]

ORIGINAL: Hairyarse Hi Rav I've got D90's on my S2 and I think the same tyre sizes. I've only had it a week or so but pumped them up last night to what it says in the handbook, 36 psi front and 44 psi rear. Seems ok so far Cheers Andy

I must have spent half an hour at least with a foot pump putting air in the tyres - they needed plenty. Realised the other night what a nob I'd been - got an official Porsche compressor in the boot!!![] Not something I'm used to but it wont happen again[]

 

[Lowtimer]

Do you know what, I have done exactly the same. Mind you, you know how much you are putting in with a foot pump. And it's good exercise! Still... [][]

 

[Hairyarse]

It certainly made me feel less guilty for not going to the gym as planned that day[]

 

[Neil Haughey]

I always used to run about 2 psi more in the rear tyres on my S2 when it was a road car and we do the same on the 968. Front pressure will be between 34 and 37 psi depending on which tyres on which car and when. On the 968 I currently set the fronts to 36 and the rears to 38.