Anti-Geometry: Difference between revisions
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Anti-Geometry is suspension geometry that is intended to reduce the dive or squat of the car. Anti-geometry includes anti-dive and anti-squat (as well as anti-lift which will not be covered as it is not applicable). Wheel loading remains the same regardless of anti-geometry because the total longitudinal load transfer under acceleration or braking is a function of wheelbase, forces and center of gravity height. Anti-geometry changes amount of load going through the springs and the pitch of the car. Thus, it is largely used for aero benefits. | Anti-Geometry is suspension geometry that is intended to reduce the dive or squat of the car. Anti-geometry includes anti-dive and anti-squat (as well as anti-lift which will not be covered as it is not applicable). Wheel loading remains the same regardless of anti-geometry because the total longitudinal load transfer under acceleration or braking is a function of wheelbase, forces and center of gravity height. Anti-geometry changes amount of load going through the springs and the pitch of the car. Thus, it is largely used for aero benefits. | ||
= Swing Arms = | = Side View Swing Arms = | ||
[[File:Swingarm.png|thumb|549x549px|Side View Swing Arms shown as the red lines. Red dots are instant centers. ]] | [[File:Swingarm.png|thumb|549x549px|Side View Swing Arms shown as the red lines. Red dots are instant centers. ]] | ||
To determine anti-geometry, a side view swing arm must be generated. Draw a line from the 2 mounting points of each front control arm rearward until they touch. Then, draw a line from the 2 mounting points of each rear control arm forwards until they touch. These 2 points are called instant centers. From each instant center, draw a line to its respective wheel's contact patch. This line is the Side View Swing Arm (SVSA). | To determine anti-geometry, a side view swing arm must be generated. Draw a line from the 2 mounting points of each front control arm rearward until they touch. Then, draw a line from the 2 mounting points of each rear control arm forwards until they touch. These 2 points are called instant centers. From each instant center, draw a line to its respective wheel's contact patch. This line is the Side View Swing Arm (SVSA). | ||
== Anti-Squat == | == Anti-Squat == | ||
Anti-squat limits the compression of the rear suspension under acceleration. Anti-squat is expressed as a percentage | Anti-squat limits the compression of the rear suspension under acceleration. Anti-squat is expressed as a percentage. 100% anti squat represents no rear suspension compression under acceleration. % Anti Squat is calculated using: | ||
<math>% Anti Squat = \frac{SVSA height/SVSAlength}{h/L} * 100</math> | <math>% Anti Squat = \frac{SVSA height/SVSAlength}{h/L} * 100</math> | ||
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== Anti-Dive == | == Anti-Dive == | ||
Anti-dive limits the compression of the front suspension under braking. Anti-dive is expressed as a percentage. % Anti Dive is calculated using | [[File:Antidiveex.png|thumb|510x510px|Things needed to calculate % anti dive ]] | ||
Anti-dive limits the compression of the front suspension under braking. Anti-dive is expressed as a percentage. 100% anti dive represents no front suspension compression under braking. % Anti Dive is calculated using: | |||
<math>% AntiDive = %FrontBraking * SVSA height/SVSAlength * L/h * 100</math> | <math>% AntiDive = %FrontBraking * SVSA height/SVSAlength * L/h * 100</math> | ||
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* h is the height of the center of gravity | * h is the height of the center of gravity | ||
* L is the wheelbase length | * L is the wheelbase length | ||
* %FrontBraking is the percentage of braking done by the front brake, also known as the brake bias. | |||
Latest revision as of 17:39, 14 July 2025
Anti-Geometry is suspension geometry that is intended to reduce the dive or squat of the car. Anti-geometry includes anti-dive and anti-squat (as well as anti-lift which will not be covered as it is not applicable). Wheel loading remains the same regardless of anti-geometry because the total longitudinal load transfer under acceleration or braking is a function of wheelbase, forces and center of gravity height. Anti-geometry changes amount of load going through the springs and the pitch of the car. Thus, it is largely used for aero benefits.
Side View Swing Arms[edit | edit source]
To determine anti-geometry, a side view swing arm must be generated. Draw a line from the 2 mounting points of each front control arm rearward until they touch. Then, draw a line from the 2 mounting points of each rear control arm forwards until they touch. These 2 points are called instant centers. From each instant center, draw a line to its respective wheel's contact patch. This line is the Side View Swing Arm (SVSA).
Anti-Squat[edit | edit source]
Anti-squat limits the compression of the rear suspension under acceleration. Anti-squat is expressed as a percentage. 100% anti squat represents no rear suspension compression under acceleration. % Anti Squat is calculated using:
Where:
- SVSAheight is the height of the rear instant center from the ground
- SVSAheight is the rear Side View Swing Arm horizontal length
- h is the height of the center of gravity
- L is the wheelbase length
Anti-Dive[edit | edit source]
Anti-dive limits the compression of the front suspension under braking. Anti-dive is expressed as a percentage. 100% anti dive represents no front suspension compression under braking. % Anti Dive is calculated using:
Where:
- SVSAheight is the height of the front instant center from the ground
- SVSAheight is the front Side View Swing Arm horizontal length
- h is the height of the center of gravity
- L is the wheelbase length
- %FrontBraking is the percentage of braking done by the front brake, also known as the brake bias.
