Why is it bad for an automatic car to coast in neutral

Because the automatic gearbox is hydraulically driven. Even if you change to neutral, the friction plate of the gearbox is still working, but the lack of hydraulic pressure after neutral gear is easy to reduce the oil pressure of the gearbox, causing the friction plate and gear to burn out without the cooling and lubrication of the gearbox oil. Therefore, do not coast in neutral gear when the car is in automatic transmission.

Neutral coasting is not recommended for automatic transmissions for the reason of fear of wear and fuel, but as long as the reason is not for all automatic transmissions, it is not possible to slide in neutral. Transmissions that are driven with torque converters should not coast in neutral due to the fact that the gearbox quickly loses its lubrication capacity after neutralization;

Reasons why the car with automatic transmission cannot coast in neutral gear:

1. Different from the 2113 mechanical hard connection of the manual transmission, the automatic transmission uses a hydraulic torque converter for power transmission. Pass.

The engine drives the transmission oil and indirectly transmits power to the wheels, all three of which coexist in the torque converter.

2. However, when the gearbox is in neutral, the engine speed will gradually fall back to a level of about 1000rpm (depending on the model). The wheels continue to rotate, driving the flow of transmission oil, but due to inertia, the transmission oil will be more concentrated on one side of the wheel. As a result, the gears of the transmission components 5261 are still lubricated even in neutral gear.

3. What really causes damage to the gearbox is actually caused by the speed difference between the wheel speed and the engine shaft. On the manual transmission model, the driver hangs the gear from neutral to the forward gear, can choose the appropriate gear according to the engine speed, and the clutch is semi-linked while still through the control of the oil supply to make the car 4102 wheel speed and the engine transmission shaft tend to be synchronized.

But the automatic transmission is not so smart, and this speed difference has the effect when the automatic transmission engages the forward gear in neutral.

Automatic transmission neutral coasting has an impact on the car. Once in neutral, the wheels are mechanically disconnected from the engine, and then the brakes can only be used to control the speed, and the brakes are components that convert kinetic energy into heat energy by friction, and the performance is easy to deteriorate or even fail when working for a long time. That's why it's common on highways to avoid avoidance lanes for large vehicles with failed brakes.

Neutral Coast Severity:The most serious problem with coasting in neutral is safety, because when coasting downhill, the car continues to drive forward by inertia and gravity, and if you coast in gear, then the engine is "dragged" by the wheels and rotates, which plays the role of "braking".

Therefore, it is not recommended that the owner try to coast in neutral, although there is no accurate statement that coasting in neutral will cause substantial damage to the vehicle or can save fuel, but it is clear that coasting in neutral has serious safety risks.

Pacific Automobile Network] automatic transmission neutral coasting has an impact on the car, because when switching to neutral, the gearbox does not supply oil, but it is still moving, so no oil lubrication will accelerate the wear of the gearbox, so the automatic transmission is forbidden to slide the neutral position.

Automatic neutral slippage is harmful to the car, because when switching to neutral, the transmission does not supply oil, but it is still moving, so no oil lubrication will accelerate the wear of the gearbox, so automatic transmission is forbidden to slide neutral.

The car with an automatic transmission cannot slide into neutral. Modern cars are all computer-controlled fuel injection. If you release the accelerator pedal while coasting, the computer will automatically cut off fuel when the engine revs beyond idle, which is as fuel-efficient as a car.

If coasting in neutral, the engine runs at idle speed, but it consumes oil. In addition, automatic transmission cars are lubricated by oil pressure. The neutral coasting mechanism does not have the right to start the oil pressure.

The gearbox is prone to combustion. When a car with the same automatic transmission breaks down, long-distance towing is not possible.

Neutral coasting refers to the operation method in which the driver puts the gear lever in neutral position, separates the engine from the clutch of the driving wheels, and uses the inertia of the vehicle to drive. The air taxi must be carried out under the condition of ensuring the safety and technical condition of the vehicle, and it is not allowed to turn off the engine, especially when going down a steep slope or a long slope, it is not allowed to turn off the engine or take a car empty.

Photo by Pacific Automobile Network Q&A).