Firestone 4-corner, Installation Instructions Manual

COMMONLY ASKED QUESTIONS

What is the lifetime expectancy of the Firestone dryer?

If there are no system leaks it should be for good for system life.

What type of accuracy is available with our system?

The height sensors that we use are capable of an accuracy of 0.67% of 1 degree. Our system with ECU programming is designed to work with 1/4
of a degree of accuracy. For comparison sake, a pneumatic leveling valve can have a dead band of approximately 3/8”.

How do electronics help increase the life of the compressor?

Mechanical valves waste air when the vehicle goes around corners or stops with a wheel in a hole or on a curb. The ECU recognizes these situa-
tions and responds accordingly, not allowing unnecessary air consumption. The situations when mechanical valves cause unnecessary compressor
use can be approximately 15% of trip time.

Are the valves environmentally protected?

The valves are plated for corrosion protection.

Are the connectors environmentally protected?

Firestone uses connectors that have IP68 moisture protection. This means they can withstand 1/2-meter water depth.

Why do the height sensors need to be mounted with the arms in a certain direction?

If provided with a wire harness the power and ground to each vehicle corner expects the height sensor arm to be in a certain position relative to
the body of the sensor. If mounting backwards, the system would act in reverse, or may not work at all.

Does the ECU have to be reprogrammed if the power source is removed?

No, the memory is nonvolatile.

How durable is the Firestone height sensor arm?

The height sensor arm of the Firestone system is designed to withstand the most severe vehicular environments. The sensor has been used on
high-mileage and off-road applications. The tensile load that the arm has withstood approximately 600lbs in an application. Although the arm is
designed for durability, this durability is a function of proper installation. Offset, shear loading has the potential to damage the arm. While it is true
that the shear loading can be corrected using a strong, metal arm the force will then be exerted elsewhere in the sensor. The result is typically
cracking the sensor body or pivot point leading to the introduction of moisture, corrosion and failure.

Is the ECU certified for electromagnetic interference (EMI)?

The Firestone ECU has been certified to E11 standards, far exceeding the base requirements for EMI. This means that the Firestone IntelliRide sys-
tem does not emit an electromagnetic disturbance that will affect other electronic systems.

What is electromagnetic interference (EMI)?

Any electromagnetic disturbance that interrupts, obstructs, or otherwise degrades or limits the effective performance of electronics/electrical equip-
ment. It can be induced intentionally, as in some forms of electronic warfare, or unintentionally, as a result of spurious emissions and responses,
intermodulation products, and the like.

How much travel should I have with my WR8-760-2230 IntelliRide system?

The amount of travel is dependent upon the working range of the height sensor as well as the position of the height sensor arm and linkages
(mechanical advantage). The system will perform if the sensor arm operates within the yellow section of the sensor template. Refer to Step 5 of
Height Sensor Installation in the 2230 Installation Instructions.

Is the ECU environmentally protected?

The ECU has a conformal coating agent which protects it from moisture.

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