Sway Bars
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Originally Posted by Croc,Oct 11 2010, 11:00 PM
in all my cars when i increase pressure i get better traction.
i'm not talking here about crazy PSIs - but about going from 32 to 36 or 38 (all on hot tires). i never went over 39.
so from my expirience:
more pressure at the rear = more traction in the rear = less oversteer
i'm not talking here about crazy PSIs - but about going from 32 to 36 or 38 (all on hot tires). i never went over 39.
so from my expirience:
more pressure at the rear = more traction in the rear = less oversteer
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The ratio between tire pressure and tire grip is directly related to the type/brand of tire.
Tires are a cylindrical shape, and air pressure tries to make them into a sphere shape. Over-inflate a tire and the 'footprint' is rounded, under inflate, and the sidewalls will roll and the center will buckle in. Because of the sidewall supports, and cording differences between tires, this will vary from each manufacturer/make, and will vary based on the suspension/alignment on the vehicle. Each tire has a 'maximum grip' zone in which the full tire is making contact, and the sidewalls are supported enough to keep the tires in contact with the ground.
Strictly from a pressure perspective, lower pressures are grippier because there is less spring (yes, tires are considered a spring and part of the suspension). This is why drag cars run so little pressure. However, in cornering situations, if the sidewall rolls under, it will offer less grip, thus... it is a balance.
As far as sway bars, take the rear one off or/and slap a big sway bar on the front. I autocross, and use the Saner (1.25" thick solid) sway bar for the front. That bar is more than adequate to tame down the rear end while leaving the rear bar intact.
Tires are a cylindrical shape, and air pressure tries to make them into a sphere shape. Over-inflate a tire and the 'footprint' is rounded, under inflate, and the sidewalls will roll and the center will buckle in. Because of the sidewall supports, and cording differences between tires, this will vary from each manufacturer/make, and will vary based on the suspension/alignment on the vehicle. Each tire has a 'maximum grip' zone in which the full tire is making contact, and the sidewalls are supported enough to keep the tires in contact with the ground.
Strictly from a pressure perspective, lower pressures are grippier because there is less spring (yes, tires are considered a spring and part of the suspension). This is why drag cars run so little pressure. However, in cornering situations, if the sidewall rolls under, it will offer less grip, thus... it is a balance.
As far as sway bars, take the rear one off or/and slap a big sway bar on the front. I autocross, and use the Saner (1.25" thick solid) sway bar for the front. That bar is more than adequate to tame down the rear end while leaving the rear bar intact.
Joined: Mar 2008
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From: Laguna Beach
Originally Posted by AP1EastTN,Oct 15 2010, 01:21 PM
Strictly from a pressure perspective, lower pressures are grippier because there is less spring (yes, tires are considered a spring and part of the suspension). This is why drag cars run so little pressure. However, in cornering situations, if the sidewall rolls under, it will offer less grip, thus... it is a balance.
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From: Israel
so now we have an explanation why higher pressure gives better grip.
ah, i was talking about grip in corners as i never had grip problems rolling on the straight line and i can't imagine understeer/oversteer grip problems on a straight line.
ah, i was talking about grip in corners as i never had grip problems rolling on the straight line and i can't imagine understeer/oversteer grip problems on a straight line.
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