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Pulse & coast (engine off) economy (automatic)

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rosieuk
Member

Posts: 184

Pulse & coast (engine off) economy (automatic) Mar 21, 2019 14:51:57 GMT via mobile

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Post by rosieuk on Mar 21, 2019 14:51:57 GMT

I just read that the Australian version of the ADO17 automatic only has a single "front" end transmission pump in the transmission.
If this is the case universally do not use the pulse & coast method of economy driving slipping the transmission into neutral and switching off the engine while the car is moving forward at road speed.
You will eat your transmission in fairly short order and I shudder to think what a new one of those will cost.
P & C is ok in the manual transmission cars (I use it myself) but the problem in a single pump auto is that in most cases the pump doesn't pump when the transmission is in neutral/engine off which is fine when you are stopped - but it's not fine when parts of the transmission are turning at road speeds and are not getting lubrication. If it is an automatic transmission and you can't push start it, then don't do engine off p & c.

dave1800
Global Moderator

Posts: 3,527
Attribute: Technical Guru.

Pulse & coast (engine off) economy (automatic) Mar 22, 2019 0:38:57 GMT

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Post by dave1800 on Mar 22, 2019 0:38:57 GMT

Highway Code

Rule 122

Coasting. This term describes a vehicle travelling in neutral or with the clutch pressed down. It can reduce driver control because

engine braking is eliminated
vehicle speed downhill will increase quickly
increased use of the footbrake can reduce its effectiveness
steering response will be affected, particularly on bends and corners
it may be more difficult to select the appropriate gear when needed.

While there isn't any UK law specifically prohibiting someone from coasting downhill, if you were to be involved in an accident that was influenced by coasting, the argument could be made that the driver did not have control of the vehicle – which would be an offence.

As the UK crabs do not have dual circuit brakes I would definitely not recommend it and savings in fuel economy would be marginal as very little is used going down hill and are probably offset by having less speed to attack the up hill sections where fuel consumption is considerably higher.

Australian auto boxes are the same as the UK spec.

David

Last Edit: Mar 22, 2019 0:53:21 GMT by dave1800