Odd Anti Sway bar Question
Joined: Nov 2004
Posts: 17,181
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From: OC - So Cal
Odd Anti Sway bar Question
I have Stillen anti-sway bars... currently med front, med rear settings... would changing the rear setting help plant inside rear wheel on aggressive turns to the extent that I can (help) overcome the wheel-spin from open differential?
Registered User
Joined: Dec 2003
Posts: 2,514
Likes: 5
From: Marietta, Georgia
Remember a sway bar reduces the traction on the end where it is placed by transfering some of the transfer weight off of the loaded tire.
One normally selects springs so that the stiffness ratios are equal to the front rear weight ratios say 55% front 45% rear [obviously this changes in braking and acceleration when axle weights can shift 20% depending on wheelbase].
Sway bar ratios should be the same as weight ratios................however you have to pick either corner entry, mid corner, or corner exit as the weight ratios will be different in each..............as so accelerating out of corner will reduce rear traction as the tire friction must be shared.
Often times too much rear bar stiffness will actually lift the inside tire making spinning more common on corner exit power on driving.
Try softening the front sway bar as oem and thus after market are always too stiff.
Softening the front has the effect of stiffening the rear RATIO without as many downsides.
One normally selects springs so that the stiffness ratios are equal to the front rear weight ratios say 55% front 45% rear [obviously this changes in braking and acceleration when axle weights can shift 20% depending on wheelbase].
Sway bar ratios should be the same as weight ratios................however you have to pick either corner entry, mid corner, or corner exit as the weight ratios will be different in each..............as so accelerating out of corner will reduce rear traction as the tire friction must be shared.
Often times too much rear bar stiffness will actually lift the inside tire making spinning more common on corner exit power on driving.
Try softening the front sway bar as oem and thus after market are always too stiff.
Softening the front has the effect of stiffening the rear RATIO without as many downsides.
Joined: Nov 2004
Posts: 17,181
Likes: 154
From: OC - So Cal
Originally Posted by Q45tech
Remember a sway bar reduces the traction on the end where it is placed by transfering some of the transfer weight off of the loaded tire.
One normally selects springs so that the stiffness ratios are equal to the front rear weight ratios say 55% front 45% rear [obviously this changes in braking and acceleration when axle weights can shift 20% depending on wheelbase].
Sway bar ratios should be the same as weight ratios................however you have to pick either corner entry, mid corner, or corner exit as the weight ratios will be different in each..............as so accelerating out of corner will reduce rear traction as the tire friction must be shared.
Often times too much rear bar stiffness will actually lift the inside tire making spinning more common on corner exit power on driving.
Try softening the front sway bar as oem and thus after market are always too stiff.
Softening the front has the effect of stiffening the rear RATIO without as many downsides.
One normally selects springs so that the stiffness ratios are equal to the front rear weight ratios say 55% front 45% rear [obviously this changes in braking and acceleration when axle weights can shift 20% depending on wheelbase].
Sway bar ratios should be the same as weight ratios................however you have to pick either corner entry, mid corner, or corner exit as the weight ratios will be different in each..............as so accelerating out of corner will reduce rear traction as the tire friction must be shared.
Often times too much rear bar stiffness will actually lift the inside tire making spinning more common on corner exit power on driving.
Try softening the front sway bar as oem and thus after market are always too stiff.
Softening the front has the effect of stiffening the rear RATIO without as many downsides.
Registered User
Joined: Dec 2003
Posts: 2,514
Likes: 5
From: Marietta, Georgia
BMW was one of the first to create a workable rear sway bar auto adjuster tied to rain and wipers to decrease bar stiffness as the weather and rear traction turned foul.
The concept could be adapted. As to straight line the bars don't function as long as there in no body roll.
One normally selects springs and uses sway bars to fine tune the steering response.
Getting the stiff stocks to auto expand [nitrogen pressure]to help force the springs down quicker is often a trick only accomplishable with external reservoir units.
Weight the unsprung components: tire, wheel, brakes, hub, half the suspension arms springs and shocks to determine the maximal amount of sway bar stiffness allowable [to transfer to the tire patch] be sure to correct for bar mount and attachment and side wall stiffness of tire.
If the unsprung is 150 pounds make sure the real rear bar stiffness corrected for motion and angle to the tire tread is no more than that.
Don't be confused by the rated inch pounds of the bar alone as it can be 3-4 times the real tread number.
Normally one just softens the rear bar until the problem goes away.
The concept could be adapted. As to straight line the bars don't function as long as there in no body roll.
One normally selects springs and uses sway bars to fine tune the steering response.
Getting the stiff stocks to auto expand [nitrogen pressure]to help force the springs down quicker is often a trick only accomplishable with external reservoir units.
Weight the unsprung components: tire, wheel, brakes, hub, half the suspension arms springs and shocks to determine the maximal amount of sway bar stiffness allowable [to transfer to the tire patch] be sure to correct for bar mount and attachment and side wall stiffness of tire.
If the unsprung is 150 pounds make sure the real rear bar stiffness corrected for motion and angle to the tire tread is no more than that.
Don't be confused by the rated inch pounds of the bar alone as it can be 3-4 times the real tread number.
Normally one just softens the rear bar until the problem goes away.
Last edited by Q45tech; Apr 16, 2007 at 11:02 AM.
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