Hellooo Smitty, hope my question finds you safe and well. This is actually part tire pressure and part springs related, as pertains to street automobiles. When you open the driver's door of most modern cars, you'll find a sticker with specified cold tire pressures on it. Some recommend the same cold pressure front and rear axle. Some recommend offset: The old Corvair had a whopper of an offset: 15psi front, 26psi rear. Most recent Porsches have a offset: 35 front, 43 rear. For mass-produced econoboxes and family sedans, even front-wheel drive only ones with weight biases up to 60% front / 40% rear, the same cold tire pressure is specified on both axles. My theory is, on those cars where the same cold tire pressure is specified for both axles, that different thickness of spring coil are used, so the owner doesnt' have to remember which axle gets which tire pressure. On my 2010 Honda Accord, and my wife's older Corolla, the front coils measure 1-2mm thicker than those on the rear. Was this done so the weight bias would not have to be compensated for with different front and rear tire pressures? And do cars where different pressures are recommeded(IE: aforementioned Porsches, Audis, Subarus, etc) for different axles have the same coil thickness? Thanks for any insight you may have on this!
Hellooo Smitty, hope my question finds you safe and well.
This is actually part tire pressure and part springs related, as pertains to street automobiles.
When you open the driver's door of most modern cars, you'll find a sticker with specified cold tire pressures on it.
Some recommend the same cold pressure front and rear axle. Some recommend offset: The old Corvair had a whopper of an offset: 15psi front, 26psi rear. Most recent Porsches have a offset: 35 front, 43 rear.
For mass-produced econoboxes and family sedans, even front-wheel drive only ones with weight biases up to 60% front / 40% rear, the same cold tire pressure is specified on both axles.
My theory is, on those cars where the same cold tire pressure is specified for both axles, that different thickness of spring coil are used, so the owner doesnt' have to remember which axle gets which tire pressure.
On my 2010 Honda Accord, and my wife's older Corolla, the front coils measure 1-2mm thicker than those on the rear. Was this done so the weight bias would not have to be compensated for with different front and rear tire pressures?
And do cars where different pressures are recommeded(IE: aforementioned Porsches, Audis, Subarus, etc) for different axles have the same coil thickness?
Thanks for any insight you may have on this!
What about shocks that let you independently change fast vs slow damping control on both compression and rebpund? Is that a thing that's possible?