يعني ايه oversteering ‎‎& understeering

[EgyptianTune]

أولاً بص حضرتك أنا سوقت جر أماممى وخلفى وكواترو كمان

ثانياً مش محتاجة مواقع ديه خبرة وتجربة

ثالثاً يعنى إيه المصنع بينزل الجر الأمامى والخلفى ب Understeer بنسبة 90%

رابعاً يعنى إيه تبطىء سرعة العربية بدواسة البنزين !!!!

[otefa]

أولاً بص حضرتك أنا سوقت جر أماممى وخلفى وكواترو كمان

ثانياً مش محتاجة مواقع ديه خبرة وتجربة

ثالثاً يعنى إيه المصنع بينزل الجر الأمامى والخلفى ب understeer بنسبة 90%

رابعاً يعنى إيه تبطىء سرعة العربية بدواسة البنزين !!!!

ما هو حضرتك أنا سايق الكلام ده كله برده و4*4 كمان+بايكس كمان.
وليه بس النرفزة دي هو الواحد يا يعدي حاجة فيها لبس يا يبقي غلط!
ودواسة البنزين القصد تشيل رجلك أو تخفف الدوسة

[EgyptianTune]

مش نرفزة واللهى أنا بأتناقش معاك بالعقل والمنطق

[otefa]

أتفضل شوف اللينك ده كدة وواحدة واحدة بالمنطق زي ماقولت


[flash=http://en.wikipedia.org/wiki/understeer]width=900 height=400[/flash]




Common practice

It is common practice among automobile manufacturers to configure production cars deliberately to have a slight linear range understeer by default. If a car understeers slightly, it tends to be more stable (within the realms of a driver of average ability) if a violent change of direction occurs, improving safety. If the owner fits new tires to the rear axle only, that will tend to decrease the understeer margin so the vehicle is actually less stable at high speed, but probably still with some understeer. However, that only applies for lower lateral acceleration. More importantly when on wet surfaces hydroplaning might occur and when the tires get near their friction limit, the new tires with better grip from the deeper tread will give better limit handling of understeer, as claimed in San Luis Obispo County Court Case CV078853, and others.[citation needed] When replacing only two tires, manufacturers therefore recommend fitting the unworn ones to the rear, and the best of the old ones to the front axle (assuming identical tires front and back); however, this is not ideal.

[EgyptianTune]

بص يا باشا سيبك من ويكيبيديا أنا هاوضحها بالمنطق والتجربه :


أولاً العربيات الجر الأمامى بتبقى وظيفة العجل الأمامى وظيفتين فى نفس الوقت توجية العربية فى إتجاه السير (أو الملفات) وثانياً تحريك العربية فبالتالى مع السرعة الزايدة فى الملفات بيبقى صعب على العربية تعمل الوظيفتين فى نفس الوقت فبالتالى إحتمال حصول ال Understeer كبير جداً .

الحل فى ال understeer تسيب بنزين وممكن تشعر فرامل بسيطة بس


ثانياً العربيات الجر الخلفى بتبقى وظيفة العجل الأمامى فقط توجيه العربية فى إتجاه السير (أو الملفات) فبالتالى مش ممكن يحصل ال understeer وبالتبعية العجل الخلفى ليه وظيفة واحدة فقط وهى تحريك العربية فبالتالى مع السرعة الزايدة فى الملفات بتحس إن العجل الخلفى بيجبر العربية إنها تمشى فى إتجاه عكس إتجاه العجلات الأمامية فبالتالى إحتمال حصول ال oversteer كبير جداً

الحل فى ال oversteer بيبقى العكس تزود بنزين وتلف العجل فى الإتجاه المعاكس للملف يعنى تعمل دريفت وبالتالى فى الDrifting بيفضلوا العربيات الجر الخلفى

[otefa]

ياباشا الكلام ده مش ويكيبديا بس والله

Understeer is not just present during acceleration through a corner, it can also be found during heavy braking. If the brake balance (the strength of the brakes in terms of the front and rear wheels) is too heavy at the front this can cause understeer. This is caused by the front wheels locking and losing any effective steering. The opposite is true if the brake balance is too strong towards the rear wheels causing the rear end to spin out (like a child skidding on a bicycle). In ordinary road cars a safe brake balance (tending towards slight understeer) must be found.
Racing drivers, on asphalt surfaces, generally prefer a neutral condition (with a slight tendency toward understeer or oversteer, depending on the track and driver preference) because both understeer and oversteer conditions will scrub off speed while cornering. In rear wheel drive cars understeer is generally faster on a circuit because the rear wheels need to have some grip available to accelerate the vehicle out of the turn.

[EgyptianTune]

والله أنا قلت اللى عندى وخلاص

والكلام ده غلط 100% ده من أيام فرامل الجبس والأسمنت قبل ما يخترعوا ال abs , esp, asr

[otefa]

خلاص براحتك وأنا قلت الي عندي برده من غير لا جبس ولا يحزنانون...تحياتي

[EgyptianTune]

أولاً مش كل حاجة مكتوبة فى الويكي تبقى مظبوطة لأن أنا وإنت وأى حد ممكن يخش يعدل فيها

ثانياً شوف حتى اللينك بتاعهم فى أول ال Article كاتبين Disclaimer عشان حد يأكد صحة الكلام المكتوب

This article needs additional citations for verification.
Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (December 2008)

ثالثاً يا باشا ما تزعلش مش عارف ليه بتاخد الكلام شخصى أنا أقصد بالمنطق لو عربية حتى ما فيهاش أحدث تكنولوجيا الفرامل والثبات وماشية فى خط مستقيم إزاى مع الفرامل الجامدة جدا تحدف يمين أو شمال ( عن تجربة عمرها ما حصلتلى ) ديه تبقى تكتوك

[otefa]

ياباشا أنا عارف أن الويكي بيديا مش منزه عن الغلط بس الموضوعات دي أنا متابعها من أكتر من 10 سنين وقاري عنها في أكتر من مقال ومنتدي طيب شوف ده كمان


Understeer and Oversteer

ولا زعل ولا حاجة طالما الهدف الوصول للحقيقة بهدوء وأثباتات



It's possible for a vehicle to exhibit both understeer and oversteer at different times. A classic example of this is the first-generation Porsche 911 Turbo. With the weight of the engine over the back axle, a big tire size difference front-to-rear, and an engine that produces a sudden hit of power when the turbo spools up, the old 911 Turbos were notorious for their evil handling characteristics, going from power-off understeer to power-on oversteer at the speed of thought. Porsche has managed to breed these traits out of the newer 911's through careful chassis tuning, redistribution of weight, and the adoption of an all-wheel-drive system for the newest Turbos.

[otefa]

For this reason, you'll almost never see a factory-stock car with a rear anti-roll bar, but no bar on the front. Without getting into a lot of advanced car dynamics, I'll just say that putting a "swaybar" or anti-roll bar on one end of the car (or replacing an existing one with a stiffer bar) will tend to give the opposite end of the car more traction. Thus, most cars come equipped with a front bar but none in the rear, or if they have both, the front bar will be considerably stiffer. This preserves the tendencyto "safely" understeer once the limits of handling are reached.

[otefa]

ممكن يكون قصدك علي التورك torque steering في السحب الأمامي!

[EgyptianTune]

ياباشا أنا عارف أن الويكي بيديا مش منزه عن الغلط بس الموضوعات دي أنا متابعها من أكتر من 10 سنين وقاري عنها في أكتر من مقال ومنتدي طيب شوف ده كمان


Understeer and Oversteer

ولا زعل ولا حاجة طالما الهدف الوصول للحقيقة بهدوء وأثباتات



It's possible for a vehicle to exhibit both understeer and oversteer at different times. A classic example of this is the first-generation Porsche 911 Turbo. With the weight of the engine over the back axle, a big tire size difference front-to-rear, and an engine that produces a sudden hit of power when the turbo spools up, the old 911 Turbos were notorious for their evil handling characteristics, going from power-off understeer to power-on oversteer at the speed of thought. Porsche has managed to breed these traits out of the newer 911's through careful chassis tuning, redistribution of weight, and the adoption of an all-wheel-drive system for the newest Turbos.

1st this is an example of a problem with the car.
2nd it is a rear engine car so it is an exceptional case, just supercars have that type of engine placement.

We are talking practically again:

understeer is more commonly associated to front wheel drive cars. This is when you go into a corner and turn the wheel as hard as you can but the momentum of the car actually wants to go forward instead of turning.

FWD cars tend to understeer at the limit because they have most of their weights on the front wheels. The car makers design them that way because it is safer for idiots

oversteer is when the rear of your car begins to pass you into a turn. It's a lot more common on rear wheel drive (RWD) cars when the car gets "sideways".

RWD cars can be made to oversteer by breaking the traction on the rear wheels with power (accelerate). We have seen plenty of movie cars where the cars go sideways around corners. That's oversteer.

.

[EgyptianTune]

ممكن يكون قصدك علي التورك torque steering في السحب الأمامي!

I know what is a torque Steer

FWD=torque steer

You can get rid of it if you install an LSD (limited Slip Differential)

[otefa]

you can reduce but you cant get rid of it completely