General Motors X Car Automatic Transmission 21 Mass 1250 kg

General Motors X Car Automatic Transmission 21 Mass 1250 kg Drag Coefficient 0.43 1.9 Low Final 18 drive ratio 17 High 16 2.3 2.5 2.7 2.9 2.5 12 11,5 10.5 9.5 Economy EPA 55/45 (km/) Figure 11.4. The effect of engine displacement liters and final drive ra on performance and fuel economy: Adapted from Porter (1979). Transmission 21 Overal General Motors \'X\' Car Ratio Spread 3-Speed Automatic Transmission at 2.40 2.2 Optimal Axie Ratios 2.84 3.60 2.3/ Sine 20 Economy Gain with Constant 2.5 Engine Size 2.6 19 2.7 Economy Gain 2.8 with Constant Performance 18 10.5 13.0 12.5 12.0 11.5 11.0 Economy EPA 55/45 (km/) Figure 11.5. The effect of transmission overall ratio spread (span) on performance and fuel economy (Porter 1979)

Solution

The figures are related, since the first describes engine displacement (litres) and Final drive ratio to fuel consumption/ at different speeds. The second describes the variation of the same with transmission ratios.

The series of curves shown on the left appear as parallel lines on the right, while the three lines going diagonally up and down are the drive ratios

The vertical axis has been changed from Km to metres.

There is some more info in the second curve about transmission ratios, the first figure has only final transmission ratio