On 19/8/20 1:42 pm, Xeno wrote:
> 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.Â* 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.Â* 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.
>
Make that; "Manufacturers design cars to *understeer*".

--

Xeno


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