不錯的 RPM Tools

[e46bimmer]

http://www.368s.com/tools_rpm.phtml
可以計算出愛車每一檔的轉速和時速 不過要先知道車子每檔的齒輪比
Examples:
E46 325
Automatic gear ratios (:1) 3.67/2.00/1.41 I/II/III
1.00/0.74/4.10 IV/V/R final ratio: 3.46
Manual gear ratios (:1) 4.23/2.52/1.66 I/II/III
1.22/1.00/4.04 IV/V/R final ratio: 3.15
E46 330
Automatic gear ratios (:1) 3.45/2.21/1.59 I/II/III
1.00/0.76/3.17 IV/V/R final ratio: 3.38
Manual gear ratios (:1) 4.35/2.50/1.66 I/II/III
1.23/1.00/0.85/3.93 IV/V/VI/R final ratio: 2.93