BustaWrench › Answers › How do anti-roll bars change the balance of an iRacing car?
The short answer
Stiffen the front bar and you get understeer; stiffen the rear bar and you get oversteer. An anti-roll bar only does anything when the chassis rolls, which makes it the surgical tool for mid-corner balance — use it after ride height and springs are set, and one click at a time.
Springs do the heavy lifting: ride height, weight transfer over bumps, the big pitch and roll. An anti-roll bar connects the left and right wheels and resists roll. Stiffer bar, less roll — but it also loads the outside tyre harder and unloads the inside tyre faster.
Stiffen the front bar and the front resists roll, so you lose front grip mid-corner: understeer, a push, the car wanting to go straight while you are turning. Stiffen the rear and the rear resists roll, which unloads the inside rear: oversteer, especially on exit.
So if the car ploughs mid-corner, stiffen the rear bar or soften the front. If it is twitchy and wants to spin, do the opposite.
Springs affect everything — braking, acceleration, kerbs — and they change ride height. Bars mostly only kick in when the chassis rolls. That is why you use them to fine-tune balance after the springs and ride heights are set, rather than to fix a fundamental problem.
A bar that is too stiff can lift the inside tyre off the ground mid-corner, and then you have no grip at all. One click, a couple of laps, feel the difference, then decide.
Bar changes are meant to be small. If one click makes no difference to you, the real problem is probably elsewhere in the car — or in your inputs.
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