Can an automatic transmission car coast in neutral Is it fuel efficient

Automatic transmission cars are strictly forbidden to coast in neutral gear, and they are not fuel-efficient.

Neutral gliding planetary gears and other components are poorly lubricated and seriously worn, and a large amount of heat is generated at the same time, and excessive heat will lead to oil carbonization and sludge blocking the complex oil passage, resulting in insufficient oil quantity after normal oil supply and poor lubrication. Therefore, the habit of coasting in neutral gear must not be used on automatic transmission models.

The lubricating oil of the automatic transmission needs to be supplied by the engine, and the oil pressure output when the engine is idle will be relatively low, and at this time, the automatic transmission is dragged by the wheel operation and has been running the linkage, and the oil pressure is low, and the lubricating oil is less, which is easy to cause the hydraulic reversing valve in the automatic transmission.

The traffic regulations stipulate that you cannot coast in neutral, and the regulations are to prevent the brakes from malfunctioning caused by neutral coasting, especially when coasting in neutral is quite dangerous when going downhill for long distances.

The old driver's approach is understandable. This saves fuel (and may not really save fuel) and makes the most of the kinetic energy. Secondly, in the case that some drivers step on the wrong automatic gear, it will not cause the vehicle to rush forward and rear-end.

When driving on urban roads and encountering red lights, the general speed is not fast, the load of the brake is not heavy, and there is almost no brake failure.

Safety is not safe, in addition to the quality of the vehicle, most of the responsibility lies in the driver's awareness, neutral coasting and you with the accelerator are the same, return to the car you have to step on the brakes.

If you are in an automatic transmission, there is no need to put the gear in neutral if you coast, and frequent gear changes will also affect the oil circuit of the transmission.

The D gear itself has a coasting function, and when the downhill or other speeds are higher than the engine output speed, the one-way clutch inside the transmission automatically slips, which is the same as when we ride a bicycle.

The same is true for manual gears, you don't have to hang into neutral, just press the clutch to the bottom and you can slide.

The gear lock of the automatic transmission uses the engine to brake the vehicle so that the vehicle cannot coast quickly.

Since the engine and transmission are electronically controlled, fuel consumption is set. For old drivers with manual transmissions, you can't compete with others for fuel consumption, but for new drivers with manual transmissions, your fuel consumption is definitely lower than theirs.

Is coasting in neutral really fuel-efficient? The old driver told the truth.

Yes, because you don't need to step on the accelerator when you are taxiing, you only need to control the car, so it has a fuel-saving effect.

It cannot serve the purpose of fuel saving. Because when you hang the neutral gear, you remember that the engine is not turned off, and it is still burning gasoline, so it is not fuel-efficient.

Of course not, because as long as the engine does not turn off, it will also inject fuel when it is driven by the inertia of the car.

Manual transmission cars coasting in neutral gear are fuel-efficient. Carburetor injection is purely mechanically controlled, and wherever the gearbox is located, whenever air enters the inlet, the corresponding gasoline is drawn in to participate in the combustion. Even if the driver slides the throttle at high speeds, the engine creates a low enough pressure in the intake stroke that gasoline is sucked into the carburetor chamber, causing unnecessary fuel consumption.

When the neutral gear is hung, the engine only needs to keep idling running, and the engine speed is very low at this time, and the fuel consumption will naturally be reduced, so for the aging oiler cars of that era, the taxi with the neutral gear can really save fuel.

When driving a carburetor engine, the throttle valve we press controls the opening of the throttle valve, which actually controls the amount of air entering the combustion chamber. Unlike more than a decade ago, electronically controlled engine fuel injection systems were out of vogue and most cars generally used carburetor engines, unlike today's electronic injection, the carburetor fuel supply is based on the negative pressure formed when the engine intakes air into the combustion chamber, so the carburetor will continue to supply fuel as long as the air is intake.

If you release the throttle on a downhill slope and hook up a taxi 1 block, the engine will be dragged by the car. The engine speed is not low, so although the throttle is closed and the amount of air entering is limited, while the carburetor supply is still high, the air-fuel ratio is too low, which leads to incomplete combustion of the mixture in the combustion chamber, when the fuel is not full of emissions, it is exposed to air through the exhaust pipe and burns with a "shot" sound.

But if the car is in neutral and the car relies on gravity and inertia to slide downward, the engine will not be towed away by the car and run in neutral, so the carburetor engine is in neutral and it is more fuel-efficient than suspension.

Electric engine cars are basically electric engines. The electron injection system fuels the engine through the accelerator and ECU. When the accelerator pedal is released, the ECU causes the injector to slow down the injection time and stop the injection at high speeds.

Whether the engine is geared or not does not have a great impact on the work, so the EFI engine is not fuel-efficient.

I only look at the title, it doesn't save fuel, it costs fuel.

The professional maintenance technician pointed out that when the neutral gear of the automatic transmission car slides, the internal lubricating oil does not have the high pressure and large flow during normal driving, which will lead to the lubrication capacity can not meet the design requirements, accelerate the wear of running parts and friction plates, and in extreme cases, there will be serious consequences of burning the box.

From the point of view of fuel economy, neutral gear is mainly suitable for carburetor car residue, because the fuel injection of carburetor car is mechanically controlled, and as soon as the carburetor is engaged in neutral, it will automatically return to idle. At present, private cars are all EFI trucks. When the engine owner steps on the brakes and the speed changes from high to low, the computer will give instructions to stop the fuel injection, and Lingna will not resume idle fuel injection until the speed drops to about 1000rpm.

In addition, the unseated traction braking distance without an engine will be extended, which is more likely to cause accidents. The automatic is frequent, but it is very fuel-intensive. In the driving mode of a manual transmission, the vehicle generally presses the throttle deeply, which accelerates and increases the engine speed to meet the conditions of upshifting.

After gently pressing the accelerator and completely releasing the clutch, the owner will definitely press the accelerator deeply to accelerate quickly. This action should be repeated four times before moving on to the more fuel-efficient fifth gear. Even after entering 5th gear, vehicles with manual transmissions still need to press the accelerator more deeply to continue accelerating.

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