skip barber iracing setup

Now we understand how an axle can lose grip under cornering, and is this precisely what causes handling issues.

Get the Skip Barber out for a spin, and see if you can adjust the ARB to your liking! After the tyre pressures, which we handled in 5.2, another significant setting to tweak on the Skip Barber is the anti-roll bar (ARB) in the rear. You still get more grip, but proportionally less. Get the Skip Barber out for a spin, and see if you can adjust the ARB to your liking! The coefficient on the left tyre decreases from 1.25 to 1.11, while on the right tyre it increases from 1.25 to 1.35. For further explanations on the matter of ARBs, please see the more advanced chapters of this guide, which we’ll publish soon.

A softer ARB causes less lateral load transfer on its axle, compared to a stiffer ARB. If you ask too much of the car (overall G’s), the ARB won’t help.

To understand how balance is affected, we need to understand that as vertical load on a tyre is increased, the coefficient of friction of that tyre decreases. The main purpose of the ARB is to change the roll stiffness of the axle it’s installed on, which has two important implications: The ratio of roll stiffness between the front and rear axles affect the balance of the car, especially its tendency to under- or oversteer. 5.3: Anti-roll bar basics (Skip Barber F2000), 5.2: Tyre pressures basics (Skip Barber F2000), 5.4: Spring rates basics (Formula Renault 2.0), Additional Terms of Use for Coaching Platform. The ARB connects the suspension elements of two wheels on the same axle.

If you find the car unwilling to turn, you can try stiffening the rear ARB. See if you feel the effect of it, and try to visualise the forces working on the car as you go through the corners.

A stiffer rear ARB thus reduce available grip at the back while increasing it at the front, hence, making the car more oversteery and less understeery.

Let’s work through an example, using the chart above. This is because the mass of the chassis is not willing to change direction, while the tyres that grip to the surface are. Controlling how much lateral load is transferred on the front versus rear axle is a balancing act, to optimise how much grip is available at each axle. Pricing A stiffer rear ARB causes more of the lateral load transfer to be distributed to the rear axle.

When the available grip of the rear tyres is exceeded first, the car goes into oversteer; when the grip of the front tyres is exceeded first, the car goes into understeer. To give an example of an ARB’s importance: When a car without an ARB installed goes through a fast right-hand corner, the inertia forces the car to lean to the left side, which is on the outside of the corner. Cornering causes lateral (left/right) load transfer at each axle. It’s important to note that tuning the ARB will only make a difference if you are utilizing the traction circle, as explained in 3.1. Tuning the rear ARB on the Skip Barber car is mostly a question of driver preference: If you find the car too unstable for your liking, you can try reducing rear ARB stiffness. So while the total load on the axle remains the same (800kg), the total available grip is now only 955 kg. The red component in the illustration below is an anti-roll bar, which nearly every racing car has on its rear and/or front axles. Relative to the chassis, the left tyres move upwards, the right tyres move downwards, causing body roll. 550 kg + 405 kg = 955 kg (axle). Additional Terms of Use for Coaching Platform However, the ARB is essentially a torsion spring which stores some of the energy when twisted, so not the entire movement of one tire is transferred to the other. Using the ARB to balance the car See if you feel the effect of it, and try to visualise the forces working on the car as you go through the corners. For further explanations on the matter of ARBs, please see the more advanced chapters of this guide, which we’ll publish soon. The ARB stiffness can also determine the lateral load transfer between the front and rear axles, even if a car only has one ARB, like the Skippy, which only has one on the rear. An ARB can balance this out.

At 400 kg of vertical load on a tyre, the coefficient of friction is 1.25. This is known as load sensitivity. Just when you need grip the most! Try to visualise this in your mind.

Unlike downforce, this is highly relevant for the Skippy.

Additional Terms of Use for Coaches. Academy » iRacing career guide » 5.

As a result, as soon as one wheel moves up or down, the other wheel is forced to follow that motion. If you ask too little, you won’t notice any difference in handling.

This can improve the balance of the car, and increase overall grip on the axle as shown in the earlier example.

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