绅士也疯狂－捷豹 XJR 印象 （２）

HRU

捷豹的钥匙与众不同，是圆柱型齿，其它与沃尔沃相同，相信也是福特的产品。
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. Q- }5 v& O+ N% L; @启动发动机，声音很好听，有一点像野马GT，仪表盘是白色的自发光仪表。奇怪的是总公里表是绿色液晶和黑色字符，和沃尔沃完全一样。
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调整好坐椅，注意到此车车顶也有安全气囊！
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* ]( Y) |) T, t: Z( O; |4 ~# g出发，发动机不温不火，出弯时由于输出太猛，自然打滑。

2 W+ I7 z2 L' Y. Z2 q: L/ ]+ W' E来到１１１ave, 黑色路面平整，车辆稀少，来一个小冲刺！发动机仍然不动声色，瞬间到达８０－９０公里。 来到Antony Hendy, 车辆拥挤，过了yellow head, 北面清静，路面良好，再次提速，在１１０公里到１６０公里发动机突然发力，十分惬意。涡轮增压在４０００转以后才介入，非常自然，几乎无迟滞感觉。
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操控性能非常完美，比奔驰宝马减震还硬。野马GT和此车有几分神似，看来野马的流行绝非复古的简单冲动。

有趣的小插曲：

刚刚开车上路，发现自己视野有点模糊，周围景物车辆异样，以为第一次开高功率捷豹过于兴奋。仔细观察，才发现捷豹的整个前风挡玻璃中间夹有密密的电热丝，司机开始很不适应，看前面车辆感觉很怪。１０分钟后即正常。人的适应能力很有趣.......

shark27

dude, it's super charged, not turbo

HRU

that is why no lag time...
7 M3 H2 f4 }7 X1 y, p( qsupercharge rules if fuel efficiency is not a concern.

工人物语1

shark27

原帖由 HRU 于 2009-4-2 00:09 发表
. I4 b- _$ J; c7 r) H& rthat is why no lag time...
# K' n; d9 U/ [; H+ j5 Bsupercharge rules if fuel efficiency is not a concern.

/ {) P) A3 r' A0 `7 ?there is nothing to do with fuel efficiency either

HRU

supercharge uses engine's partial power to drive the compressor, not like a turbo charge uses exhaust (waste) air to drive the air into the chamber.
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This is the reason supercharge is not as efficicent as turbo charge, however, Turbo charge has lag time due to the low rpm has limited power to spin the turbin, only rpm  is high enough the turbin works well ....
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9 J  R% s! x! R1 }1 h, ZThis is my understanding for the supercharge and turbo chare.
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Supercharge refers uses engines power to drive a belt/chain/ to force more air into engine....
Turbo uses engine's exhuaust air to drive the turbine, which blows the ari into engine, it is a "free ride" from engine, so, it is more fuel efficient.

shark27

原帖由 HRU 于 2009-4-2 14:27 发表
supercharge uses engine's partial power to drive the compressor, not like a turbo charge uses exhaust (waste) air to drive the air into the chamber.

This is the reason supercharge is not as effici ...

; ]" U% }1 G4 y1 L3 H7 c6 t世上没有免费的午餐，要得到就必须付出
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机械增压付出的代价是输出直接输出损耗，涡轮增压的代价是因极高的排气阻力而造成的间接输出损耗。
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引擎工作的黄金理论之一：you can't shit, then you can't eat, thus, you have no power

. p( x, e$ h8 l/ O# x& C& r[ 本帖最后由 shark27 于 2009-4-2 19:47 编辑 ]

特北京

话粗礼不粗。