Frequent Shifting To N With Auto Box

[Dantay]

wanted to see if dropping out of drive to neutral as often as i could (stopped, rolling into lights) would make a difference to my fuel eco. Its made a huge different now getting about 100Km/10.1L. Just wondering if anyone can think of any reason why i shouldn't do this? possible damage to the transmission or the TC?

I wondered how the it goes finding and appropriate gear if i suddenly put it back into drive while rolling?

cheers

[GTRsean]

Well when you are stopped at the lights, the engine is under load in anything other than P or N, you can hear the engine unload when you select neutral,park. It does save fuel, it won't damage your gbox. I'd only select neutral when stopped thoiugh, not rolling along in case you need to accelerate in a split second etc.

[sl33py]

I wondered how the it goes finding and appropriate gear if i suddenly put it back into drive while rolling?

I've got a friend who does this stupid trick in his manual, and yes it does save SOME fuel, BUT you are sacrificing a degree of control over the car. What if you suddenly need to speed up to avoid someone whose about to rear end you, or dive into the next lane to avoid a someone literally trying to 'merge' with you? In both situations, if you can't plant it and get yourself out of trouble, your a sitting duck. In my opinion, diminished ability to accelerate (or NO ability in this case) is equally as bad as diminished braking capability.

Oh and whatever you do, don't turn the engine off altogether while rolling, like a mate's mate did - the steering wheel locked up and he was killed in a head-on (no 5h1t).

Go buy a econobox if you can't afford the petrol.

Edited September 4, 2008 by sl33py

[Dantay]

I understand what your saying, but I'm pretty selective when i chose to do it, only coming to a halt. I have been racking my brain but cannot think of a situation where planting it will get me out of an accident without causing one at the same time. I was almost taken out by a Hi-lux which got under steer coming around a corner and headed straight for me waiting at the lights, but even then pushing forward into the intersection would have caused an incident also.

I'm more concerned about doing damage to the drive chain. either the fuel saved is huge or my odometer is reading wrong because I'm getting 10.2L per 100Kms consistently without changing anything else.

[Basti]

as long as you rev match before putting it back into D, it will find the right gear. you should be fine

[Dantay]

just like a dog box?

[cankas]

I can come up with a good reason, its called lubrication. your gearbox has a pump in it the faster you go the more it pumps, if your putting it in N at speed it reduces the oil being pumped. might not sound much but over time it will all add up. At the lights is fine and does work just dont rev up b4 putting it in D, real quick way to blow a gearbox. If u really want to save fuel when ur coming to the lights take your foot off the throttle and pull it through the gears manually, with no throttle and more revs than idle the ecm wont need to let any fuel through to the engine.

Edited September 5, 2008 by cankas

[sl33py]

cannot think of a situation where planting it will get me out of an accident

I know people who have accelerated to narrowly avoid being rear ended by a *^%&tard.

But you do what you want - you're in Bris, I'm in ACT - doesn't bother me