Forza Tuning Labs

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Author:  Driver [ Mon Aug 04, 2014 12:52 pm ]
Post subject:  Oversteering/understeering

A very elementary topic, I'm sure, but always of interest. For clarification, how does one recognize excessive under- or oversteer? I suspect understeer is easier to detect, because one turns the wheel and the car doesn't turn. Oversteer, however is more problematic. How can one tell when the excessive turning is due to the driver and when it is due to the car or the tune?

Author:  RelaxedPRKid [ Tue Aug 05, 2014 8:49 pm ]
Post subject:  Re: Oversteering/understeering

I really these go hand-to-hand (the driver, and, the oversteer amount).....let me you get much better on the Driver scale, you will be able (and actually want) to manage a lot more oversteer and use it to your advantage to gain speed. If the car is looser, and you can drive it, it should help! Excessive is a "relative" measure per the driver.

Author:  SynapticLive [ Mon Oct 13, 2014 1:42 pm ]
Post subject:  Re: Oversteering/understeering

You're right about the elementary nature of "over" and "under" steering... however, it's something that you'll return to time and time again.

In regards to understeering, your exactly right... you turn the wheel and the car rotates (laterally) less than the wheels would normally dictate... I'm sure you're imagining a front wheel drive car when you wrench the steering wheel to the right, the front of the car hunkers down but it just keeps plowing straight ahead... or in the snow, same effect... understeer typically happens more on a corner entry, or given the right circumstances, when trying to power out of turn. Front wheel drive cars are known for all sort of understeering tendencies. If the wheels do not have enough traction while trying to power out of a turn, it will typically pull the car further from the turn (instead of into the turn).

Oversteer is just the opposite, when the car turns more than the steering wheels would normally mandate. Typically this happens during either extremely heavy corner entry braking, or after the corner has been entered, and when powering out of the corner. In essence, it's anytime the rear wheels step out of line from behind the car. Doing "donuts" in a parking lot, it basically enjoying one very long instance of oversteering. Some drivers prefer a bit of oversteer as it allows the car to be redirected and the powered straight out of a turn. If you imagine sliding a car perfectly sideways so that at some point prior to exiting a turn the car is already pointed directly out of the turn... a driver would simply apply the right amount of counter steering and mash the gas to power straight out of the turn. Incidentally, this is what a single turn would look like if someone were "drifting".

There are a myriad of ways to over come one or the other, the most typical method of managing over or understeering is via the anti-sway bars. Given the correct combination of front rear settings, understeer and oversteer can be eliminated, or a tendency to oversteer can be introduced.

The most rudimentary tuning concept starts with this... you want the most even temperature across all four tires. Ideally, that temp will be between 180 and 210. Tire pressure will be between 32 and 35psi.

For further reading, I'd recommend taking a gander at this... Tuning Guide post found on ForzaMotorsport.Net

Best of luck

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