Eibach® (11-23) Mopar Anti-Roll Kit

Compatible: (3.6L/5.7L/6.2L/6.4L)

2011 - 2023 Chrysler 300

2011 - 2023 Dodge Challenger

2011 - 2023 Dodge Charger
 

STEP 1: MOTION RATIO

A-arm Suspension - (See Diagram 1)

MR

Motion Ratio

d1

Distance from spring centerlines to control arm inner pivot center (in) or (mm)

d2

Distance from outer ball joint to control arm inner pivot center (in) or (mm)

Beam Axle Suspension - (See Diagram 2)

MR

Motion Ratio

d3

Distence between spring centerlines (in) or (mm)

d4

Distance between tire centerlines

Angle Correction Factor

ACF

Angle Correction Factor

d3

Spring angle From Vertical (see diagram 1)

d4

Distance between tire centerlines

DIAGRAM 1 (A-ARM SUSPENSION)

The motion ratio is a lever arm effect of the control arm acting on the spring. If the spring is mounted at an angle, the reduced motion of the spring must also be taken in account.

DIAGRAM 2 (BEAM AXLE SUSPENSION)

The motion ratio of a live axle setup is shown here. Over two-wheel bumps, the motion ratio is 1:1. Over single wheel bumps and during body roll, the motion ratio as shown in step 1. The motion ratio is only used for calculating roll resistance, not for suspension frequencies.

Wheel Rate (non beam)

WR

Wheel Rate (lbs/in) or (N/mm)

C

Spring Rate (lbs/in) or (N/mm)

MR

Motion Ratio

ACF

Angle Correction Factor

Wheel Rate (non beam)

SF

Suspension Frequency (cpm)*

WR

Wheel Rate (lbs/in) or (N/mm)

Sprung Weight

Vehicle corner weight less unsprung weight

Tip 1: Calculation of Wheel Rate for a given frequency

WR

Wheel Rate (lbs/in) or (N/mm) (see step 2)

SF

SF Suspension Frequency (cpm) (see step 3)

Sprung Weight

Vehicle corner weight less unsprung weight

Tip 2: Calculation of Spring Rate needed for a given Wheel Rate

C

Spring Rate (lbs/in) or (N/mm)

WR

Wheel Rate (lbs/in) or (N/mm) (see step 2)

MR

Motion Ratio

ACF

Angle Correction Factor

Determining Spring Rate

All Eibach motorsport springs are tested between 20% and 70% of the spring’s total travel. This spring rate can be measured easily using the following steps:

Example Spring—Standard: 1200.250.0500 (12”Free Length, 2.5”ID, 500lb/in)

Metric: 0300.060.0100 (300mm Free Length, 60mm ID, 100N/mm)

STEP 1: DETERMINE TRAVEL

For the spring to be rated, please refer to the specifications listed for your spring part number in this catalog and record the travel measurement.This number represents the total available travel from free height to coil bind. Our example spring travel measurements for standard: 6.25" metric: 146mm

STEP 2: DETERMINE TEST RANGE

Calculate the first test point by taking 20% of 6.25" (which equals 1.25") or 20% of 146mm (which equals 29.20mm) and the second test point by taking 70% of 6.25" (which equals 4.375") or 70% of 146mm (which equals 102.20mm). The actual travel between these two points (3.125") or (73mm) is where we determine the spring rate.

STEP 3: SPRING RATE TEST

Preload the spring 1.25" or 29.20mm and record the force measurement. Continue to compress the spring an additional 3.125" (total compression of 4.375") or 73mm (total compression of 102.20mm) and record the force measurement. Calculate and record the difference in force between the two points (1.25">< 4.375") or (29.20mm>< 102.20mm). In our example the difference would be approximately 1565lbs or 7300N.

STEP 4: SPRING RATE CALCULATION

With Eibach4s precise spring rate tolerance of +/- 2% (500 x 2% = 10 lbs) the spring rate should fall between 490 and 510 lbs/in (1565 / 3.125 = 500lb) or 95N and 105N (7300N / 73mm = 100N/mm).

Install Guide:

Warranty: