Is downshifting in an automatic bad for the transmission?

Started by BENZ BOY15, April 03, 2009, 06:43:28 PM

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Rupert

#60
April 07, 2009, 12:13:08 AM
It can...

Didn't you say it was dependent on the ECU programming? So, it might turn off and it might not, yes?
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13 cars, 60 cylinders, 52 manual forward gears and 9 automatic, 2 FWD, 42 doors, 1988 average year of manufacture, 3 convertibles, 22 average mpg, and no wheel covers.
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BENZ BOY15

#61
April 07, 2009, 05:00:06 PM
It is dependent on the ECU programming. It does turn off and on, but sometimes it's somewhere in between.
:rastaman:

Tave

#62
April 07, 2009, 07:05:12 PM
We've had this discussion a million times before whenever someone asks, "Is it better to leave the car in gear while coasting to a stop or put it in neutral?"


The general consensus: a modern engine will stop sending fuel to the cylinders off-throttle, so downshifting isn't going to give you any mpg benefits.
As I write, highly civilized human beings are flying overhead, trying to kill me.

Quote from: thecarnut on March 16, 2008, 10:33:43 AM
Depending on price, that could be a good deal.

Tave

#63
April 07, 2009, 07:08:29 PM Last Edit: April 07, 2009, 07:11:40 PM by Tave
Quote from: TBR on April 06, 2009, 03:39:31 PM
I have always heard that the injectors turn off when you're engine breaking. At the very least, it is probably using even less fuel than it would when idling.

If it does, why would you need to downshift to experience the benefit? How does coasting in 3rd using no gas trump coasting in 4th using no gas?
As I write, highly civilized human beings are flying overhead, trying to kill me.

Quote from: thecarnut on March 16, 2008, 10:33:43 AM
Depending on price, that could be a good deal.
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