On 19/8/20 9:43 am, wrote:
> AMuzi:
>
> Corvair
>
> The Corvair had a Front/Rear weight difference that
> definitely warranted the big difference between
> recommended front and rear cold tire pressures.
>
> The cars I'm talking about are somewhere in between
> that extreme, and the other: rear- and all-wheel drive
> sports sedans with almost no(less than 55/45) front-rear
> weight bias. The last time I checked, a typical BMW
> F/R weight split is like 51/49%. Yet recommended
> front/rear pressures differ by 5psi.
>
> My Honda Accord, for example, is F/R: 54/46% axle
> weight split. Some 'econoboxes' venture toward 60/40,
> yet for the Accord and those cars, a single pressure
> figure, for all tires, is specified on the door frame placard.
>
Varying the tyre pressure will vary the slip angles at which the tyres
run. The *specification* of that variation, ie. different pressure F &
R, will ensure the car runs understeer rather than oversteer.
Manufacturers design cars to oversteer and, depending on the suspension
design, tyre pressure variation is the way to ensure it.

--

Xeno


Nothing astonishes Noddy so much as common sense and plain dealing.
(with apologies to Ralph Waldo Emerson)