STARTING AND OPERATING 125
It is recommended that the suspension
system, brake system, prop shaft, and half
shaft boots be checked for wear or damage
after every track event.
Track usage results in increased operating
temperatures of the engine, transmission,
driveline and brake system. This may affect
Noise Vibration Harshness (NVH) countermea-
sures designed into your vehicle. New compo-
nents may need to be installed to return the
system to the original NVH performance.
Tire pressure:
Recommended tire pressure of 33 psi
(230 kPa) when tires are cold, or below
42 psi (290 kPa) when hot.
NOTE:
It is recommended that you target below 42 psi
(290 kPa) when tires are hot at the conclusion of
each track session. Starting at 33 psi (230 kPa) cold
and adjusting based on ambient and track condi-
tions is recommended. Tire pressure can be moni-
tored via the instrument cluster display and can
assist with adjustments.
Track burnishing your brakes
To avoid “green lining fade” during track use,
the brake pads and rotors must have a thermal
burnish for factory-installed components or
when new brake friction components are
installed:
1. Use one track session to burnish brakes by
driving at 75% speed. Brake at approxi-
mately 0.60 - 0.80g max without Anti-Lock
Brake System (ABS) intervention.
2. Complete one lap in this manner until you
start smelling the brakes. Continue for
another half lap at speed, then complete
a two lap cooldown with minimal brake
applications. Ensure the brakes are not
smoking. If they are, complete another
cooldown lap.
3. Getting the brakes to smoke is an indication
that the brakes have overheated and may
negatively affect future track usage.
4. Allow vehicle to sit and cool for at least
30 minutes. If an infrared thermal gun is
available, allow rotors to cool to 200°F
(93.3°C) before returning to the track.
5. There should be a thin layer of ash when
inspecting the brake pads. Having the ash
layer go more than half the thickness of
the pad material is a sign of an overly
aggressive burnish.
6. Occasionally, a second burnish session is
required. If the brake pads begin to emit an
odor during the next track session, reduce
vehicle speed and braking deceleration rate
to burnish targets and follow steps 2-4.
7. New brake pads installed on old rotors
require a burnish. New rotors installed with
old brake pads should be burnished at the
track or driven for 300 miles (485 km) of
city driving to develop an adequate lining
transfer layer on the rotor surface prior to
track use.
8. Rotors that pulsate during track use should
be replaced.
NOTE:
Resurfacing of the rotors is not recommended, as it
removes mass from the rotor, reducing its thermal
capacity. Resurfacing also thins the rotor cheek,
making it less robust and increasing the likelihood
of pulsation in further track use.
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21_WD_OM_EN_USC_t.book Page 125
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