Tyre pressures

[thewan]

Going to get the full alignment done tomorrow @ elite - just wondered what ppl are running pressure wise for their porkers?

I am running 225*40*18 Fulda extremos on the fronts at 40 and 265*35*18 Conti SP cont N1's on the rears at 44

[tony.t]

Personaly I wouldn't bother with the alignment until you have matching tyres front and rear.( or fit matching tyres after the alginment)

[thewan]

why?

how would different tyres affect the alignment?

serious q btw not trying to be funny

[tony.t]

The different tyre front and rear ought not affect the alignment but it does seem to have a seriously adverse effect on the handling characteristics of the car whether aligned properly or not.
There is a general consensus of opinion that the front and rear tyre should be the same make, model and N number.
Many wouldn't ft non N tyres in any case, as per the Fuldas ?

[thewan]

hmmm!

I will change the fronts but they have a load of life left on them at the mo!

[Melv]

First -match the tyres and N ratings.

Second -try 36psi cold all four.

Rgds
Mel

[tony.t]

thewan said:

hmmm! I will change the fronts but they have a load of life left on them at the mo!

It's always the way. If the Fuldas were on the rear at least you could get your moneys worth doing donuts.

[thewan]

well - all lined up now - alignment was out on 9 out of 12 measurements - all lined up and feels much better - will try dropping the pressure to 40 on the rears tomorrow and see how that feels!

T

[Joe911]

I run Michelin Cup's (on a 964RS) and only tend to drive on circuit - but I run 30 to 32, hot, all round. Any more than that and it feels right dodgy.

The Michelin Cup's do dramatically increase in pressure once their being used properly - if you set them cold for the road and then go on circuit they can easily be 15 psi too high.

[tony.t]

Joe911 said:

I run Michelin Cup's (on a 964RS) and only tend to drive on circuit - but I run 30 to 32, hot, all round. Any more than that and it feels right dodgy.

So do I but MPSCs have stiff sidewalls and your RS will be about 300kg lighter.

Having said that 44 looks too high for 18ins rears. I would have thought 36 all round a good start point.

Using road tyres I'll run 36 hot all round and can tell if presure is rising at track because over 40 the handling is just nasty.