[928uk] 1980 928 brakes.

[Paul R Smith]

Strange choice of sizes. For an 80 ( non-S) I would expect 215/60x15, for an
S it would be 225/50x16.

Tyre pressures for these are 2.5 bar (36 psi)  fronts, and 3 bar (43 psi)
for the rear, except for a non-S on 16s where the book says 2.5 bar.

The things to look out for when adjusting tyre pressures are:
reducing the pressure and the tyres becoming too hot, (hot to the touch)
grip is lost as the tyre surface "melts", this can be dangerous as the tyre
can fall apart.
increasing the pressure, tyres stay cold, getting less grip, and giving a
skittish feel.

Too low or too high can result in less grip

For my 1980 S, on 225/50x16 tyres, I run 31psi front and 38 rear in the
winter, putting them up to 36/43 for long journeys in the summer.

Smiffy

----- Original Message ----- 
From: <Patporsche928 at aol.com>
To: <smiffypr at onetel.net.uk>
Sent: Wednesday, December 31, 2003 2:13 PM
Subject: Re: [928uk] 1980 928 brakes.


> thanks smiffy,even  with the rear regulators out the rears dont seem to be
> doing any braking.i take on board what you are saying about the danger of
> this.ihad not thought about tyre pressures,and i am stunned by your
increase.ihave
> fitted new tyres this year.205 front,225 rear goodyear eagle nct f1.im not
sure
> of the correct pressure though,i run front and rear at 30 psi.any
> suggestions otherwise would be apreciated.
>              regards pat.
>