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DALL ARA iR01 | USER
MANUAL
REAR
ARB STIFFNESS
The ARB (Anti-Roll Bar) stiffness setting adjusts the roll stiffness of the rear suspension via a change in the ARB’s diameter.
Increasing the ARB stiffness will increase the roll stiffness of the rear suspension, resulting in less body roll but increasing
mechanical oversteer. Conversely, reducing the ARB stiffness will soften the suspension in roll, increasing body roll but decreasing
mechanical oversteer. This can result in a less-responsive feel from the steering, but grip across the rear axle will increase.
ARB BL ADES
The configuration of the Anti-Roll Bar arms, or “blades”, can be changed to alter the overall stiffness of the ARB assembly. Higher
values transfer more force through the arms to the ARB itself, increasing roll stiffness in the rear suspension and producing
the same effects, albeit on a smaller scale, as increasing the diameter of the sway bar. Conversely, lower values reduce the
roll stiffness of the rear suspension and produce the same effects as decreasing the diameter of the sway bar. These blade
adjustments can be thought of as fine-tuning adjustments between sway bar diameter settings.
PULLROD DELTA
Changing the Pullrod Delta results in a change in overall length of the rear suspension pullrods, directly affecting the rear-end
ride height. Increasing the Pullrod Delta will lower the rear end and decreasing the Pullrod Delta will raise the front end. Due to
the car’s mono-shock design, this adjustment changes both rear pullrods equally and prevents any crossweight changes. This
adjustment can be used to alter the ride heights without affecting the rear heave spring preload.
SPRING PERCH OFFSET
This changes the static load of the rear heave spring via an adjustable spring perch. This is used to alter the overall rear end ride
height as well as the static deflection and preload in the rear Heave Spring.
SPRING RATE
The Heave Spring is a spring element configured to provide resistance only in vertical suspension movement without affecting
roll stiffness. This spring element is used to control increasing aerodynamic loads and helps to maintain the proper aerodynamic
attitude around a circuit. Higher spring rates will increase the rear suspension’s vertical stiffness, useful for maintaining a
consistent rear ride height but can cause a loss of grip in the rear end over bumpy surfaces. Softer spring rates will result in
more rear end travel, reducing the control over the aerodynamic attitude, but will result in better rear-end mechanical grip.
DALLARA iR01 | ADVANCED SETUP OPTIONS | CHASSIS
