Table 11 The gear ratios, interval of gear ratio and transmission efficiency of ZF 9HP
From: Configuration Synthesis and Performance Analysis of 9-Speed Automatic Transmissions
Gear | Gear ratio | Interval of gear ratio | Transmission efficiency |
|---|---|---|---|
Reverse gear | − 3.80 |  | 0.8960 |
1st gear | 4.70 | Â | 0.9660 |
2nd gear | 2.85 | 1.65 | 0.9738 |
3rd gear | 1.90 | 1.49 | 0.9836 |
4th gear | 1.38 | 1.38 | 0.9917 |
5th gear | 1 | 1.38 | 1 |
6th gear | 0.80 | 1.24 | 0.9855 |
7th gear | 0.70 | 1.16 | 0.9878 |
8th gear | 0.58 | 1.21 | 0.9778 |
9th gear | 0.48 | 1.21 | 0.9736 |