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#3211887 - 12/10/13 12:19 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
actionstan Offline


Registered: 05/22/13
Posts: 472
Loc: Ohio
Originally Posted By: gr8gatzby
Quote:
Maybe even a little dumb and unsafe.


I agree that it is dumb and unsafe. That is not my quandary.

If I am doing no harm to the CVT by shifting to and from neutral while in motion in an effort to prevent unnecessary revs to the engine, and willing to accept the risks to the safety of myself and my passengers, why not do it?


It may not damage anything, but you win nothing by doing it. I think you should go back and read the last part, that just sounds ludicrous..safety among all else should be the #1 priority of whoever is in the driver seat. When rolling while in gear, fuel cutoff happens, to either completely cut, or minimize fuel usage. What are you trying to gain here?


Edited by actionstan (12/10/13 12:25 AM)
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#3211889 - 12/10/13 12:30 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
gathermewool Offline


Registered: 01/09/09
Posts: 3639
Loc: New England
Originally Posted By: gr8gatzby
Quote:
Maybe even a little dumb and unsafe.


I agree that it is dumb and unsafe. That is not my quandary.

If I am doing no harm to the CVT by shifting to and from neutral while in motion in an effort to prevent unnecessary revs to the engine, and willing to accept the risks to the safety of myself and my passengers, why not do it?


1. Have you read the posts stating that:

a. The injectors shut off in many autos while engine-braking downhill;

b. The engine is braking, so you don't need to use your actual brakes to maintain downhill speed;

c. If an emergency arises, you have the vehicle in gear to provide acceleration.

2. Read what you typed and ask yourself if it makes any sense at all...
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#3211896 - 12/10/13 12:46 AM Re: Are my habits harmful to this CVT? [Re: gathermewool]
gr8gatzby Offline


Registered: 11/22/05
Posts: 588
Loc: Charlotte, NC
Quote:
a. The injectors shut off in many autos while engine-braking downhill;


Engine braking is not a factor when revving at idle speeds

Quote:
b. The engine is braking, so you don't need to use your actual brakes to maintain downhill speed;


Engine braking should only be used as a method of deceleration in emergencies. Engines are more expensive to replace than brake pads.

Quote:
c. If an emergency arises, you have the vehicle in gear to provide acceleration.


I agree, that's why I only shift into neutral on a downslope when not surrounded by traffic, and risk is at an absolute minimum.
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#3211903 - 12/10/13 01:28 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
Dominic Offline


Registered: 07/04/02
Posts: 1783
Loc: Alabama
Bad idea, leave it in gear - it will use less fuel with the injectors "off" and the car momentum spinning the engine than if the engine is forced to idle on its own.
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#3211910 - 12/10/13 01:39 AM Re: Are my habits harmful to this CVT? [Re: Kuato]
demarpaint Offline


Registered: 07/03/05
Posts: 21516
Loc: NY
Originally Posted By: Kuato
Originally Posted By: Shannow
Because you get a $180 ticket if the cop thinks you are coasting in neutral (in either an auto or manual) in my state.


It's illegal lots of places in the US also.

/hijack


+1
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#3211913 - 12/10/13 01:47 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
PandaBear Offline


Registered: 08/05/02
Posts: 12521
Loc: Silicon Valley
Just out of curiosity, when did car engine start using fuel cutoff during deceleration or going downhill to save gas? Was it when they started using fuel injectors? or only when they start using computer intensively?
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#3211915 - 12/10/13 01:53 AM Re: Are my habits harmful to this CVT? [Re: PandaBear]
901Memphis Offline


Registered: 08/14/10
Posts: 6310
Loc: Northern Kentucky
Originally Posted By: PandaBear
Just out of curiosity, when did car engine start using fuel cutoff during deceleration or going downhill to save gas? Was it when they started using fuel injectors? or only when they start using computer intensively?


OBD2 iirc
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#3211916 - 12/10/13 01:53 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
Shannow Online   content


Registered: 12/12/02
Posts: 27021
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#3211938 - 12/10/13 03:14 AM Re: Are my habits harmful to this CVT? [Re: 901Memphis]
Tegger Online   content


Registered: 03/20/06
Posts: 1467
Loc: Canada
Originally Posted By: 901Memphis
Originally Posted By: PandaBear
Just out of curiosity, when did car engine start using fuel cutoff during deceleration or going downhill to save gas? Was it when they started using fuel injectors? or only when they start using computer intensively?

OBD2 iirc

Well before that. My '91 Integra shut off the fuel on decel above something like 1,500 rpm.

The shutoff limit has been lowered over the years as engine computers have gotten faster and emissions regulations tighter. I think the newest cars shut off fuel on decel just above idle speed.

My understanding is that fuel-cutoff on decel wasn't practical before electronic injection.
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#3211953 - 12/10/13 05:05 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
Voltmaster Offline


Registered: 10/08/12
Posts: 829
Loc: California
i used to use neutral as much as possible on my Accord, after my tranny failure i decided to just put it at d4 and let it be.

I have not noticed any mpg gains or losses, engine will never rev down to below 500 rmp to your save basicly nothing.

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#3211955 - 12/10/13 05:21 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
eljefino Online   content


Registered: 06/15/03
Posts: 24360
Loc: ME
You've made up your mind! Go for it.

Also take note when you put it back in drive it has to rev-match somehow, which is different than you doing so when stationary.

Originally Posted By: gr8gatzby
Quote:
a. The injectors shut off in many autos while engine-braking downhill;


Engine braking is not a factor when revving at idle speeds


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#3211959 - 12/10/13 05:53 AM Re: Are my habits harmful to this CVT? [Re: Shannow]
fdcg27 Online   content


Registered: 09/25/09
Posts: 9529
Loc: OH
Our old Mercedes four apeed automatics had instructions in the OMs for tow starting them.
You had to be going at a decent clip, though.
It isn't like push starting a stick.
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#3211968 - 12/10/13 06:27 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
Pop_Rivit Offline


Registered: 02/09/08
Posts: 3664
Loc: Midwest
Originally Posted By: gr8gatzby
I agree that it is dumb and unsafe. That is not my quandary.


It should be. You have a responsibility to your fellow motorists as well as your passengers to operate your vehicle in the safest possible manner. If, by your own admission it's both "dumb and unsafe" then the conversation ends there. Don't do it. There are a lot of people here telling you just how dumb and unsafe it is, but you're refusing to listen.

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#3211996 - 12/10/13 07:20 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
Char Baby Offline


Registered: 05/25/05
Posts: 7476
Loc: Rochester NY
Slightly off topic...Though this only pertains to regular auto trannys(for those who want to know), IDK how this in particular relates to CVT's:

In a regular automatic tranny, by putting the gear selector in "N" while coasting as compared to keeping it in "D", the trannys torque converter is spinning at a higher speed and the engine is now at idle. Where as they(engine speed/tranny tq conv) should both be at the same speed while coasting/foot off the gas pedal at speeds.

I too have done this(gear selector in "N") on numerous occassions w/o issues but, it's probably not optimal!

Did I say all of this correctly?


Edited by Char Baby (12/10/13 07:22 AM)
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#3211998 - 12/10/13 07:21 AM Re: Are my habits harmful to this CVT? [Re: Kuato]
Charlie1935 Offline


Registered: 05/18/08
Posts: 372
Loc: DuQuoin, Illinois
Been illegal in Illinois for a long time.
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