For a diesel engine, the general rule is: the higher the engine speed, the greater the consumption. After all, at moderate speeds, the engine has more time for internal mixture formation, which is so typical for diesel engines: the engine therefore works more profitably. For example, a turbodiesel engine "Golf" consumes, as a rule, about 6.9 liters per 100 km; in continuous mode "full throttle" it consumes 2 liters more diesel fuel for every 100 km of run. Therefore, it is desirable that the engine runs at 50-70% of the maximum speed.
Thus, without fear of causing damage, one can adhere to the following way of driving: move with acceleration, depress the accelerator pedal not too timidly, but shift to the next higher gear as soon as possible. When the desired speed is reached, shift to the highest possible gear and let the car move while lightly depressing the accelerator pedal. It is desirable for the engine to operate at high speeds only if the situation on the road requires it, for example when overtaking or when driving in a convoy.
You can also save fuel by letting the car roll freely. When a certain speed is set and the accelerator pedal is released, the diesel engine receives the amount of fuel that corresponds to idling. But in this case, the free movement due to the high braking effect of the diesel engine is incomparably shorter than with neutral in the box. Automatic transmission also works on this principle (lever position "E").
For example, the shift lever can be set to neutral if you are in "cork" in traffic, at a bus stop, or on a sloping highway. On the contrary, you should leave the speed on when descending a mountain, otherwise the brakes will get a big load. Never consider depressing the clutch pedal while in gear, always in neutral, otherwise there is a risk of clutch engagement in low gears and higher speeds. Never turn off the engine if the car is coasting! After several brakings, the brake booster will fail.
At every long stop, turn off the engine, for example, in front of a barrier, before "cork" in traffic, in front of a traffic light. Even 5-7 seconds of waiting time can save fuel.
Formula E
For continuous fuel savings in already cost effective diesel models "Golf" And "Jetta" there is also a tooling according to the so-called formula E. External characteristic features: large front fairing (spoiler) only for model "Golf" or rear spoiler for model only "Jetta"; there are also coatings on the front windows and an inscription on the back. Along with external signs, there is also a shift indication and a slightly modified 4-speed gearbox.
But the test results of the firm "Volkswagen" the engine is less stressed at low speed and high load than at high speed and partial load. To do this, the electronic control unit processes information about the speed and angle of rotation of the lever of the high-pressure fuel pump. If the load on the engine proves to be uneconomical, a signal is given for the corresponding switchover. Riding with shift indication does not mean that high speeds must be avoided. At "sports" full throttle accelerations and when reaching maximum speeds, the shift indication does not flash because the desired high acceleration prevents early upshifting. Only when the next higher gear gives the same speed, there is an immediate signal that it is possible to shift.
The indicator board remains dark when driving downhill with the accelerator pedal released or in the highest gear E.
The so-called 3+E gearbox is not designed for strong acceleration, driving in the mountains and at maximum speed. It is designed for favorable conditions that contribute to economical fuel consumption, that is, if movement is carried out at medium and high speeds. With this gearbox, the gear ratio of 3rd gear corresponds to the 4th gear of a conventional 4-speed gearbox. This is the so-called direct transmission. Gear E is designed for lower engine speeds and lower fuel consumption.
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