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what is over and understeer

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Old Dec 27, 2006 | 02:03 PM
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what is over and understeer

and can someone give some examples how to make it easier for the car to not overandundersteer like bracers etc
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Old Dec 27, 2006 | 02:07 PM
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Ok, hold on. Don't get in the habit of coming to a site as a newbie and just posting up a newbie question without 1) searching, 2) using the newbie forum and 3) using the proper forum where such things are discussed.

Head to the Motorsports forum and/or the Driving Techniques forum at the bottom. Basically, to understand these 2 concepts, you have to experience them. However, in laymen's terms, understeer is when you go to make a high-speed turn, and you turn the steering wheel, but the car keeps going straight - it's called "pushing." Oversteer is the opposite in that your rear end whips around while making that same turn and often results in a "spin-out."

The Evo inherently understeers, so when we do suspension/tire mods to make the car faster around the track, we typically work on ways to increase grip up front to reduce understeer. You will find greater details in the aforementioned forums, and you will also find that the major suspension tuners have different methods for achieving the end goal. Just be sure you don't start buying cheap $100-150 "suspension" mods like chassis braces, strut tower bars, sway bars, etc etc, but rather do a full suspension package that is designed to work together.
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Old Dec 27, 2006 | 02:08 PM
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Oversteer is when the rear end comes out too much, and understeer is when the car is not turning as much as the input you put in the steering wheel, like "pushing" the car.

Well, most of the time EVO's will understeer more than over. If you would like to make the car car more neutral, you can put a larger rear sway bar in.
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Old Dec 27, 2006 | 02:10 PM
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Looks like someone's desperate to get enough posts to post in the "for sale" section
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Old Dec 27, 2006 | 02:11 PM
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Not while I'm watching.....Moved.
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Old Dec 27, 2006 | 02:14 PM
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angry you are right in a way but 50 is alot and i dont have time but these are real questions cuz ive just been getting into cars reading everything i can to learn and doing everymod myself so i have alot of questions lol and thanks for the info guys and ive been online searching for about 4hrs now on the site for a few questions so i figured i could get a coupole answered by posting thanks guys
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Old Dec 27, 2006 | 02:17 PM
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Please learn to use punctuation, proper grammar, and complete sentences. I'm sure you learned not to do run-on sentences in elementary school.

Also, if you do every mod yourself and have searched for 4 hours, you would not have made these incredibly noobish threads (I count 4 so far).
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Old Dec 27, 2006 | 08:59 PM
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Under-steer is the condition experienced when the cornering load on the FRONT tires exceeds the grip available for cornering.

Over-steer is the condition experienced when the cornering load on the REAR tires exceeds the grip available for cornering.

To better understand these conditions, you really need to develop an understanding of the traction circle. The traction circle is a representation of the total grip available from each tire. Mechanical grip is a byproduct of the compound, tread, and vertical loading of a tire as well as the grip properties of the driving surface. While in general, this is represented as a circle, it is important to note that on most modern tires, it's more of an ellipse. The tire design, including tread, ply construction, compound, and cross-section are all vary from tire to tire. However, for your purposes, the circle idea will work.

Remember, a tire can only do so much work. It has a limited amount of grip available, and it must be shared across all the tasks the tire performs. Acceleration, braking, and cornering. As you accelerate, grip is used for that purpose, making less available for cornering. The same goes for braking. Obviously, as you ask the tires to use more grip for cornering, there is less available for braking. Because of the mechanics of weight transfer, some additional vertical loading may be achieved on the front or rear tires by braking or accelerating, respectively. Again, however, if you're honestly asking this question, don't worry about this right now.

The key to controlling tire slip (whether over or under steer) is smooth driving. Yes, you can spend money modding your car. The guy who spends money on seat time will always be faster (in the twisties, any way). At the-winding-road.com I list a number of excellent books on car control that anyone who is serious about getting the most out of their vehicle should read.

Returning to your question, the previous posts describe the symptoms of over-steer and under-steer very well. In an over-steer condition you will feel the steering wheel become "lighter" (easier to turn) with much less effect. In most cases, easing of the brake while winding out (reducing) steering input will correct the situation. In an over-steer condition, you will notice the back-end sliding toward the outside of the turn. I often notice a slight dizzy feeling as this begins. Nothing serious, just enough to let me know that the car is spinning more than it would under balanced conditions. This is often solved by gently reducing throttle while winding on opposite-lock (pointing the front wheels where you want to go). I have induced under-steer with the throttle and over-steer with the brakes, but you have to be pushing pretty hard for that to happen.

Note, I make no warranty that my advice will actually help you recover from an unbalanced condition, so please don't blame me if you wind up turning your car into scrap metal.

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Old Dec 27, 2006 | 09:54 PM
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Can all ways count on Top Gear for a nice explanation. The best visual on the difference:
http://youtube.com/watch?v=lIB3bbdU9oU
Under steer at it best:
http://youtube.com/watch?v=1bZmLxDb5RM

Last edited by Grey_Fox; Dec 27, 2006 at 10:01 PM.
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Old Dec 28, 2006 | 07:36 AM
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Originally Posted by IAmADirtDude
and can someone give some examples how to make it easier for the car to not overandundersteer like bracers etc
I am guessing you know what it is, stopping it from happening is easy.

Slow down.

(Now, "How do I stop under and oversteer while staying at the same speed or going faster?" is a much harder question to answer.)
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Old Dec 28, 2006 | 05:53 PM
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+1 on the traction circle. I learned it from the "Driving Faster" DVD...
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Old Dec 28, 2006 | 05:58 PM
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Warrtalon... do you nevermind. Why cant you just answer a question without being you!! DAMM! BTW whats a ring land? What sway bars can I use to make the car more neutral?

Last edited by WrX Kila; Dec 28, 2006 at 06:01 PM.
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Old Dec 29, 2006 | 10:21 AM
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You don't use sway bars to make a car neutral - you get a proper suspension with the proper daming, spring rates, and corner balancing. If you add a rear sway to reduce understeer, then all you're doing is REMOVING grip from the rear as opposed to adding grip to the front. You won't understeer, but you'll have less overall grip.
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Old Dec 29, 2006 | 11:14 AM
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Understeer = when you turn the wheel yet the car keeps going straight. You know you've crashed due to understeer because you closed your eyes the moment before impact.

Oversteer = When the rear end steps out on you. You know you've crashed due to oversteer when you never closed your eyes because you hit the wall back end first.
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Old Jan 3, 2007 | 11:31 AM
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Originally Posted by Warrtalon
You don't use sway bars to make a car neutral - you get a proper suspension with the proper daming, spring rates, and corner balancing. If you add a rear sway to reduce understeer, then all you're doing is REMOVING grip from the rear as opposed to adding grip to the front. You won't understeer, but you'll have less overall grip.
you can use sway bars to increase/decrease understeer/oversteer if you do not want to switch out springs/dampening shocks. thickness/stiffness to a sway either increases/decreases oversteer and understeer handling and depending on either the front or rear being +/-.

but yes with spring rates you can also change the characteristic of oversteer/understeer as well as with dampening rates partially to the rebound rate.

not much to driving an awd with the ecu controlling everything anyway.
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