Lotus Elise S1 Service Notes page 501

Lotus Service Notes Section XA
At the lowered ride height, the suspension geometry should be set as follows:
Subject
Front Camber:
Specification
- 0 . 3 °
(std. ride height: - 0.1°)
Tolerance
+ 0.1°, - 0 . 2 °
Max. difference side/side
0.2°
Front Caster
+ 3.8
± 0 . 2
0.2
Front Toe 0.2 mm
toe out overall
- 0, + 0.2 mm
Rear Camber* - 2.0° ± 0.2° 0.2
(std. ride height: - 1.8°)
Rear Toe 1.2 mm
toe in each side
- 0, + 0.2 mm 0.2 mm
* In extreme cases, it may be necessary to machine the top ball joint plinth in order to attain sufficient negative
camber.
Rear Bump Steer
The rear suspension toe-links are designed to steer the rear wheels in incremental amounts as the car rolls
with cornering forces, in order to produce the required handling characteristics. The general requirement is for
the outside wheel to adopt a small amount of toe-in as it moves towards bump with roll.
A shim stack is provided at the outboard end of the toe-link, by which the joint height, in relation to the
wishbone pivots, may be adjusted. A basic stack dimension detailed below, will provide an approximately
correct geometry, but in order to optimise the characteristic, accurate individual wheel alignment equipment (or
a dedicated bump steer gauge) must be used to measure the toe change for each rear wheel. Lowering the
joint height by 0.9 mm (1 shim washer) will increase the toe-in at 40 mm bump travel by approx. 0.2 mm.
Refer to the graph below, and select a shim stack to provide a toe change on bump travel to lie within the
tolerance band. Note that if the Uniball toe link is used, the shim stack is distributed above and below the joint.
Bump
travel
40
30 •
20
Displacement
from
ride
height
(mm)
Droop
travel
10
0
-10
-20
-30
-40
Tolerance band
-0.3 -0.2 -0.1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Increase in toe-in
from base setting (mm)
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