Golf Mk 6 BlueMotion Stop/Start Efficiency?

[Hepialid]

Does anyone know how efficient the Golf BlueMotion Stop/Start technology is?

The system is normally engaged when the car is stationary, at say traffic lights, when you put the handbrake on, out the car into neutral and release the clutch. The engine is started again by pressing the clutch.

I have only tended to use this system when I know I am going to be stationary for any more than 15 - 20 seconds. I am aware that restarting even a warm enginer requires a spurt of fuel.

Does anyone know if there is any available information to show what is the minimum stationary (i.e engine off time) needed to cancel out the engine restart fuel consumption?

Thanks in advance.

[Piwoslaw]

Originally Posted by Hepialid

I have only tended to use this system when I know I am going to be stationary for any more than 15 - 20 seconds. I am aware that restarting even a warm enginer requires a spurt of fuel.

Does anyone know if there is any available information to show what is the minimum stationary (i.e engine off time) needed to cancel out the engine restart fuel consumption?

From what I've read, in fuel injected cars the "spurt" of fuel at startup is negligible. Someone here calculated (I can't find the post, this was quite a while back) that killing the engine is worthwhile whenever your stop is longer than 2-3 seconds. (The actual number was less than a second, but you should factor in 1-2 seconds for driver reaction and actual startup.)

Often you can kill your engine while coasting towards a red light, before actually stopping - this how second generation Start-Stop systems work.