MOSTLY SUSPENSIONS
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Link Length Optimization

LINK LENGTHS

A common problem with a trailing link suspension (e.g., a 3link or 4link) is that a small change in ride height results in a very large change in percent anti-squat. Unfortunately, considerable rise of the chassis...particularly at the front...can be unavoidable during a dragstrip launch. This spreadsheet provides the link lengths that will maintain a constant value of percent anti-squat with an increase of 2 inches in ride height. (The effect is similar to that used in SLA suspensions for camber control.) Note that the equal link lengths commonly found in commercial competition 4link kits would seldom be ideal. Information from this spreadsheet would be useful, then, only for those fabricating their own links and brackets.

The horizontal and vertical dimensions are related to the rear tire patch.

center of gravity height =

wheelbase =

percent anti-squat =

Upper Link Location:

horiz. dist. to rear pivot =

vert. dist. to rear pivot =

Bottom Link Location and Length:

horiz. dist. to rear pivot =

vert. dist. to rear pivot =

vert. dist. to front pivot =

bottom link length (pivot to pivot) =

TOP LINK LOCATION (FRONT) AND LENGTH:

vert. dist. from track surface:

top link length:

ratio of lengths:

INSTANT CENTER LOCATION:

horiz. dist. from rear axle centerline:

vert. dist. from track surface:

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