jc421 wrote:
Subaru那個影片...(恕刪)
沒錯！
驅動力和抓地力是兩回事
一般行路輪胎都打滑了，你還要繼續踩油門？
四輪打滑都失去磨擦力，你要等到輪胎找回抓地力，車子才能找回循跡性
某幾輪打滑失去磨擦力，也是要靠其它沒打滑輪胎的磨擦力維持循跡性，對輪子輸出力道的分配就很重要，打滑的那輪，輸出要減少，現在很多車都有配備，不是只有AWD才有
如果有靜磨擦力可以用，幹嘛要靠動磨擦力？
其實大家查一下AWD和safty就可以看到很多了
以下是4x4abc.com的「Is 4WD safer than 2WD?」
No 4WD system - no matter how sophisticated - will make driving much safer. Especially not on snow and ice. Not on rainslick roads either. 4WD safety is somewhat of a myth.
If there less traction (the stuff that happens between the tires and the ground) there is less stability to move and operate a vehicle safely. Period.
Snow and ice provide very little traction, and even though 4WD doubles the amount of traction compared to a 2WD vehicle - twice the amount of "very little" is still not much. In fact it is only about 10% to 20% of traction of what is available on dry pavement.
Reducing speed in low traction situations will improve safety - the safety of a 2WD as well as the safety of a 4WD. On snow and ice using good snow tires helps a bit, however, only chains will dramatically improve stability and safety (but they are inconvenient and noisy).
4WD was originally invented to move very heavy loads without spinning wheels on mostly dry surfaces. Or to get a vehicle up steeper grades without spinning wheels.
Today 4WD/AWD is a sales tool to make car buyers feel safer - emphasis on "feel".
4WD or AWD make a vehicle handle a bit more stable and thus a little safer. Powering all wheels adds some convenience when moving on slippery surfaces - but it does not add safety per se. No drive system, no matter how advanced, can defy the laws of physics.
For off-road use 4WD is a wonderful tool enabling you to travel under the most adverse conditions.
“但說到動態的雨天駕駛...拜現在科技所賜...AWD, RWD, FWD都一樣安全...我可以想到AWD唯一的優點就是它讓車有稍微高一點的操控極限....”
高一點的操控極限... 跟 高一點的極限... 不就等於是少一點的失控機率？ 這不是一體兩面？
同一個駕駛人會因為開FF 就很乖很守秩序，開AWD就變玩命飆仔嗎？...
如果不會，那AWD/RWD/FWD在所有變數都一樣的情況下，它動態就不可能是一模一樣的，那怎麼會一樣安全？
我書讀得不多 不要欺負我
當然，對於行車操控而言，輪胎是最基本而直接的配備，在雪地或爛泥路駕駛，沒有選擇適當的輪胎那是萬萬不行的。
不過，這邊主題是談到AWD vs 2WD，我們可以先假設輪胎規格是相同的，這樣才有意義。
還是PO影片吧
https://youtu.be/Hlnw2SUgY6U（AWD vs FWD vs RWD: Who Wins?）
綜合結論而言AWD在部分項目是有一點點優勢，但還是有討論到C\P值的部分。這個就要看個人抉擇了。
https://youtu.be/12wSs4PEUWE（M．B的Ad）
這個很逗，車神居然被另一位冠軍車手譏為Sunday Driver，不過也看得到車廠對於自身科技的信心。
但是，車廠也對廣告下了註解：A Mercedes-Benz will bring you through the winter in style. However, even a 4MATIC drive cannot protect a professional racing driver from the other drivers ...
所以，行車安全的責任最終還是要回到駕駛者的本身。
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