(发了贴才发现是别人的号---西索)

之前看过不少帖子是有关于车子性能的讨论，争论不少，有价值的信息也很多。但都不具体今天和大家具体讨论一下。希望可以帮助对玩车有兴趣的朋友。

首先要看驱动， 以下是3种驱动方式的优点和缺点（转贴自Extreme test drive 专业汽车驾驶学院[URL=http://www.extremetestdrive.com/fwrwawdwhisb.html]http://www.extremetestdrive.com/fwrwawdwhisb.html[/URL]）

全文如下

[COLOR=Blue]There are three drive types that modern sports and sporty cars use. Let's look at some of the advantages and disadvantages of each.

Front Wheel Drive

The main advantage of FWD is that cars can be made lighter due to the close proximity of the engine to the drive wheels. Because of this reason they also tend to have less frictional hp loss between the engine and the tires. Dynamically FWD is an advantage on low grip surfaces because the front of the car is able to pull the rest of the car on the desired path. If you are sliding adding more throttle will help the car gain stability. This generally makes FWD the easiest to drive on pavement. The main disadvantage of FWD is the higher amounts of understeer that comes along with it. You are asking the front tires to both accelerate the car and also do most of the turning work. This leaves the front tires over taxed while the rears still have unused grip available. To the driver this means that the car has trouble rotating, it will tend to want to drive straight off the road more than other drive types. The understeer is further intensified because FWD cars have all their heavy drivetrain parts only in the front; this tends to make them have a nose heavy weight distribution. These effects can be somewhat lessened with suspension tuning and driving techniques but the inherent traits cannot be removed. FWD usually provides the slowest lap times on a dry road course of the three types with a professional driver at the wheels. This may not be true with amateur drivers because FWD is easier to reach the limit with.

Advantages: Easy to drive, good in slippery conditions, light weight, low fricitonal power losses.

Disadvantages: Understeer, least performance for pro road racers. Worst weight distribution of the three types.



Rear Wheel Drive

RWD effectively utilizes the available traction of both the front tires for turning and the rear tires for acceleration. If conditions are sticky it is probably the fastest drive type for pro road racers. The disadvantage of RWD is that it is the hardest to drive of the three types. If you have sufficient power for the grip of the track you will have to fight oversteer on corner exits, increasing the chance of a spin. (Some say this is an advantage in the fun department) Launches from a standing start are faster than FWD but slower than AWD. Usually provides for the best weight distribution of the three types.

Advantages: Evenly distributes the traction duties to the front and rear tires, probably fastest on a sticky road course. Best ability to hang the tail out on corner exits. Best weight distribution of the three types.

Disadvantages: Most challenging for driver to master, worst type in snow/ice/mud, slower launch than AWD.



All Wheel Drive

AWD has some characteristics of FWD and some of RWD. It is the best for really slippery off road conditions. It is also the fastest drive type to launch from a standing start. Although you probably shouldn't try to many drop clutch launches with your street car as the clutch can wear out quickly. You have the grip of four tires trying to accelerate you rather than just two. It is probably the fastest drive type for slippery road course conditions. It is easier to drive than RWD. The disadvantages are that it yields the heaviest car of the three drive types. Its weight distribution is worse than a RWD but better than a FWD. It also understeers more than a RWD because the front tires have to both accelerate and do most of the turning. It has the most frictional hp losses between the engine and the tires of the three drive types.

Advantages: Probably the fastest on a slippery road course. Easier to drive than RWD. Fastest launches of the three types. Best for snow/ice/mud.

Disadvantages: Heaviest of the three types, most hp loss between the engine and the tires of the three types. Not as good of weight distribution as RWD. More understeer than RWD.



Summary

For racing its really a toss up between RWD and AWD, each has its advantages and disadvantages. All three types can be very fun to drive with at the limit, and that is most important, right? The truth is AWD can be better sometimes, RWD can be better other times, and FWD has its moments. The more slippery the track, the worse the tires, or the more hp your engine has the more AWD gets better. RWD is by far the most commonly used drive type for racing. For off road or slippery tracks AWD is hard to beat. On the street, the truth is it doesn't matter much which drive type you choose. Handling differences really don't become apparent until you get close to the limit, which is not smart to try on the street. For most people who drive only on the street the differences would be invisible, except maybe if you floor it from a stop. [/COLOR]

所以也就是说后驱和四驱是最理想的驱动系统。

著名的汽车厂商也都选择这两种驱动方式。

[COLOR=Red]后驱[/COLOR]：法拉利，奔驰，宝马，捷豹，宝石杰，奥斯顿马丁，陵志，尼桑（部分），丰田（部分），INFINITI(部分)等等

[COLOR=Red]四驱[/COLOR]：兰博基尼，奥迪，尼桑（SKYLINE），苏巴鲁，等等


然后就是发动机的构造。分类（I, H,V,A,R.T.,W）缸数(4-12)个别有更多的
这个没什么好说的，各有各的有点。同样的发动机布局不同公司也有不同的性能。I 直列，H并列，V 就是V型排列，A就是全铝制，R.T.就是转子（最新推出，但好不好现在还不好说），W就是双V排列(跑车中比较少见)。 发动机是车子的动力来源，功率越大越好


（YS,要求加精!!!!!
吃饭去了，待续！希望爱车的朋友踊跃发言，大家互相交换意见）

不好意思，刚刚用了女朋友的号码。

车子发动机的性能要从两个方面来看, 马力和扭力。 有些朋友以为转速也是，其实转速高也是为了追求以上两个数据的最大值。 有的厂商喜欢做小缸，高转速的发动机。有的厂商喜欢，大缸，低转速的发动机。总体而言，没有什么区别。 高转速的发动机的声音一般比较高，但发动机的磨损也就高，而且最快加速比例比较晚。 低转速的发动机的声音低沉，前冲加速比较早。 跟性能没有什么关系。 马力呢就是发动机中轴半径垂直面转动方向的推力，一般决定着车辆的后期加速和最高速（最高速也取决于驱动方式，依次--〉〉后驱，前驱，四驱）。扭力就是发动机中轴面的扭转力，一般决定着车辆的爬坡能力，初始加速能力。 一般来说200匹马力，200以上扭力的车辆就可以被看作是具备基本性能的跑车。240匹马力240匹扭力的车子以上就可称为，高性能跑车。 280匹280扭力以上的车辆就是超级跑车。340匹300扭力以上的就可以成为顶级跑车。

然后就是车体，车身的气流分配，车体的重量，底盘的紧密度。 气流没什么好说的，只有顶级跑车之间才看这个。底盘紧密度呢，现在基本上所有的厂商都作的很不错。（我说的是能做高级跑车的厂商）。 车体重量是最重要的， 车体越轻，马力利用率就越高，但同时，高速安全指数和稳定性就越低。 车体重的 则反过来讲。（待续）

我给你加精了 继续努力。。

马力和扭拒跟转速有关的，尤其扭拒
正入西索所说有些厂商是小缸高转速，这以为这车子达到最大功率和扭拒是转速比较高，也就是我们要给很大的油让车子保持高转速，这样才能达到最佳动力
而大缸低转速，车子达到最大功率和扭拒的转速低，也不需要给很大的油去保持高转速
我觉得这个地方还是低转速有优势
也就是两部车子的功率和扭拒一样，哪个在更低的转速达到最大扭拒和功率哪个更有优势

也就是两部车子的功率和扭拒一样，哪个在更低的转速达到最大扭拒和功率哪个更有优势[/QUOTE]
这句话就可就错了 这是根据不同车的需要而定的 是可以通过发动机的timing可以调节的 绝对不是谁先到peak power谁就有优势的hp大的车是谁后到谁nb的 说白了 就是说 从0到peak我一直在加速 但是先到的那个就提前减速了 这玩艺我已经玩上了 效果还不错 而且这和你的齿轮比也有很大的关系 如果你一挡得行程不叫小的话 你可以调timing + + 让peak提前到 这样你彪车的时候就不用用一挡了 （4缸车阿）

SUPERMONKEY 又在这儿蛋呢，有这时间打红警阿！！！