How does swapping the final drive effect your top Speed?

How does the final drive ratio affect your top Speed?

Whenever you swap from a lower final drive ratio to a higher drive ratio, this affects your top speed. Going to too aggressive on your final drive ratio, and you'll be shifting too much and greatly decrease your top speed.

Here is a comparison of Top speeds grouped by transmission gear ratio types. The gear ratios between transmissions is very close. Tops speeds vary by 1-2 mph in the first 2 gears. Gears 3, 4, 5 have identical top speeds between all transmissions.

Redlines of 6500 and 7000rpm are listed for comparison. This shows the effect of higher redlines and top speeds. When going with aggressive ratios, software that raises your rev limit to 7000 rpm is highly recommended to offset the effect of shorter gearing.

You can use my Gear Ratio Calculator to see how transmission gear ratios, final drive ratio, tire size, and engine redline affect your top speed.

Final Drive Ratio
redline
1st
2nd
3rd
4th
5th
6th
323/325 5spd 3.07 6500 37.2 62.4 94.8 126.9 157.3
-
3.07 7000 40.1 67.2 102.1 136.6 169.4
-
3.15 6500 36.2 60.8 92.4 123.6 153.3
-
3.15 7000 39.0 65.5 99.5 133.1 165.1
-
3.23 6500 35.3 59.3 90.1 120.6 149.5
-
3.23 7000 38.1 63.9 97.0 129.8 161.0
-
3.38 6500 33.8 56.7 86.1 115.2 142.9
-
3.38 7000 36.4 61.1 92.7 124.1 153.9
-
3.46 6500 33.0 55.4 84.1 112.6 139.6
-
  3.46 7000 35.5 59.6 90.5 121.2 150.3
-
  3.64 6500 31.4 52.7 79.9 108.7 132.7
-
3.64 7000 33.8 56.7 86.1 117.1 142.9
-

 

328/330 5spd 2.93 6500 39.2 66.2 99.3 132.9 164.8
-
2.93 7000 42.2 71.3 106.9 143.1 177.5
-
3.07 6500 37.4 63.2 94.8 126.9 157.3
-
3.07 7000 40.2 68.0 102.1 136.6 169.4
-
3.15 6500 36.4 61.6 92.4 123.6 153.3
-
3.15 7000 39.2 66.3 99.5 133.1 165.1
-
3.23 6500 35.5 60.0 90.1 120.6 149.5
-
3.23 7000 38.2 64.7 97.0 129.8 161.0
-
3.38 6500 33.9 57.4 86.1 115.2 142.9
-
3.38 7000 36.6 61.8 92.7 124.1 153.9
-
3.46 6500 33.2 56.1 84.1 112.6 139.6
-
  3.46 7000 35.7 60.4 90.5 121.2 150.3
-
  3.64 6500 31.5 53.3 79.9 107.0 132.7
-
3.64 7000 33.9 57.4 86.1 115.2 142.9
-
                 
330 6spd 2.93 6500 37.9 65.9 99.3 134.0 164.8 193.9
2.93 7000 40.8 71.0 106.9 144.3 177.5 208.8
3.07 6500 36.2 62.9 94.8 127.9 157.3 185.1
3.07 7000 38.9 67.8 102.1 137.7 169.4 199.3
3.15 6500 35.2 61.3 92.4 124.6 153.3 180.4
3.15 7000 38.0 66.0 99.5 134.2 165.1 194.2
3.23 6500 34.4 59.8 90.1 121.6 149.5 175.9
3.23 7000 37.0 64.4 97.0 130.9 161.0 189.4
3.38 6500 32.8 57.2 86.1 116.2 142.9 168.1
3.38 7000 35.4 61.5 92.7 125.1 153.9 181.0
3.46 6500 32.1 55.8 84.1 113.5 139.6 164.2
  3.46 7000 34.6 60.1 90.5 122.2 150.3 176.8
  3.64 6500 30.5 53.1 79.9 107.8 132.7 156.1
3.64 7000 32.8 57.1 86.7 116.2 142.9 168.1

* Calculations base on 225/45/17 tire.

 

©2005 sycE46