Recent Topics
Rental car review....
by gregk24
34 minutes 13 seconds ago
Opinions Please about Delo 400 XLE Synblend 10W30
by Pas_Bon
52 minutes 49 seconds ago
natural gas generator
by mobilaltima
Today at 09:07 PM
Delo 400 xle in a 5.4 3v Ford Triton??
by 2012AccentSE
Today at 08:51 PM
PUP 5W20 - $22.29/5QT at Walmart
by Quark
Today at 08:48 PM
Let's fly a kite
by JHZR2
Today at 08:48 PM
Key immobilizer light flashing while driving
by mclasser
Today at 08:42 PM
Regular M1 5W30 - Australian & American formula
by SR5
Today at 08:16 PM
UOAs of same car, but with thick and thin (xw-20)
by paulri
Today at 07:58 PM
Considering 2013+ Lexus GS350
by JEL01
Today at 07:43 PM
10k on a Wix 57356, and it has lots of issues!
by slacktide_bitog
Today at 06:49 PM
5.9l Dodge Magnum oil consumption question
by mbacfp
Today at 06:46 PM
where do you find extended shank 2'' balls?
by motor_oil_madman
Today at 06:32 PM
Very interesting Moog thread
by Kool1
Today at 05:51 PM
Napa buck a at with purchase of filer.
by Dyusik
Today at 05:47 PM
O'Reilly High Mileage ATF
by logcar
Today at 05:08 PM
Is this steelie wheel repairable? Pics
by shadow7
Today at 04:25 PM
Accord drain and refill question
by aquariuscsm
Today at 03:57 PM
Trying to diagnose a front-end clunk
by mrgrim
Today at 03:44 PM
UOA of Mobil 1 EP from '05 V8 4Runner.
by JDMHero47
Today at 03:32 PM
Newest Members
Gare_the_Lubist, Pas_Bon, Bouvie, Italia64, donjuers
61954 Registered Users
Who's Online
75 registered (asleepz, 4WD, Backwoods41695, 901Memphis, 8 invisible), 1788 Guests and 27 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
61954 Members
66 Forums
266999 Topics
4415768 Posts

Max Online: 3590 @ 01/24/17 08:07 PM
Donate to BITOG
Page 1 of 4 1 2 3 4 >
Topic Options
#3211826 - 12/09/13 11:13 PM Are my habits harmful to this CVT?
gr8gatzby Offline


Registered: 11/22/05
Posts: 603
Loc: Charlotte, NC
My mother drives a 2012 Murano with a super sweet CVT. I've never met a CVT I liked, so for me to say this surprises me. Prior to this she drove a 2004 Murano with a [censored] arse piece-o-garbage how-i-loathed-thee CVT. The mannerisms and personality between these two are night and day, and I am amazed how much can change in a generation.

There is a single negative characteristic that has carried over to the current Nissan CVT: it will not "downshift" when going down hills. For example, I'm travelling 70mph at 2k rpm and approach a 1mi decline, revs stay at 2k rpm for the downward run. Being the engineer nerd that I am, I throw the gearbox to neutral to save this wasted energy and add the extra .0000001 miles to the tank of gas.

A regular geared automatic will drop to near-idle revs when the energy is not needed on a downhill slope. On my stick shift Volvo I drop it in neutral as well.

I am curious, is this shifting to and from neutral at speed doing any long term harm to the transmission? Can my OCD regarding wasted energy be justified? Thanks.


Edited by gr8gatzby (12/09/13 11:14 PM)
_________________________
'95 Ford F150 | 4x4 | 5.8 | 9MPG
'11 Honda Crosstour | AWD | 3.5 | 21MPG

Top
#3211828 - 12/09/13 11:14 PM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
Rand Offline


Registered: 08/20/03
Posts: 11633
Loc: NE,Ohio
you will actually use more gas by putting it in neutral.
_________________________
2017 Jeep Cherokee Trailhawk V6

Top
#3211832 - 12/09/13 11:18 PM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
gr8gatzby Offline


Registered: 11/22/05
Posts: 603
Loc: Charlotte, NC
How so? 500rpm vs 2000rpm over 1 mile = less gas.


Edited by gr8gatzby (12/09/13 11:18 PM)
_________________________
'95 Ford F150 | 4x4 | 5.8 | 9MPG
'11 Honda Crosstour | AWD | 3.5 | 21MPG

Top
#3211834 - 12/09/13 11:20 PM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
Shannow Online   content


Registered: 12/12/02
Posts: 35935
Loc: Oz
You are, in all likelihood running fuel cut-off on downhill...dropping it into neutral, the engine will be idling, and using fuel.

You will also have some additional load on the brakes which will be costing you money over time (cents likely).

Top
#3211836 - 12/09/13 11:21 PM Re: Are my habits harmful to this CVT? [Re: Rand]
JHZR2 Offline



Registered: 12/14/02
Posts: 39881
Loc: New Jersey
Originally Posted By: Rand
you will actually use more gas by putting it in neutral.



Thats arguable. In theory, yes, you will because the PWM on the injectors will be re-enabled to maintain idle, as opposed to turned off when closed throttle coasting in gear.

However, if at the end of the slope maximum momentum is required, going in neutral will save the pumping losses which effectively act as a brake.

My concern in any AT type vehicle is that the transmission may not be circulating lubricant properly if the pump is on the input shaft, thus causing increased wear. IIRC, only AT vehicles with a pump on the output side can be suitably pulled/coasted without potential for damage.

Top
#3211841 - 12/09/13 11:27 PM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
gregk24 Online   content


Registered: 04/13/13
Posts: 5231
Loc: FL, USA
Doing more harm than good.
_________________________
2012 Honda Accord EX-L K24z3
47,xxx miles
PPPP 0w20 / Fram Ultra

2014 VW Jetta SE 1.8T ea888
27,xxx miles
Castrol Edge 0w40 / OEM filter

Top
#3211856 - 12/09/13 11:49 PM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
daves87rs Offline


Registered: 02/23/09
Posts: 16394
Loc: Michigan
Honestly can't see it helping much....
_________________________
Whatever you are, be a good one.

Top
#3211861 - 12/09/13 11:55 PM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
CHARLIEBRONSON21 Offline


Registered: 08/28/13
Posts: 659
Loc: MEMPHIS, TN
No "L" slot? My fusion has that...
_________________________
'13 Fusion Hybrid: 5w20 PUP/FU
'15 Civic Si: 0W20 PPPP/FU
'16 Fusion Hybrid: FF
'14 Odyssey: 0w20 PUP/FU
'93 Civic: 5W30 M1/TG
'99 SVT Cobra: 5W30 M1/FU

Top
#3211864 - 12/09/13 11:58 PM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
actionstan Offline


Registered: 05/22/13
Posts: 488
Loc: Ohio
Originally Posted By: gr8gatzby
How so? 500rpm vs 2000rpm over 1 mile = less gas.


RPM isn't always equal to fuel usage. The computer will call for less fuel usage when rolling down a hill, as there is less strain on the engine. I feel like this is doing more harm than good, and you are better off staying in gear 100% of the time, until you are parking the car.
_________________________
1999 Saturn SL1
2013 KIA Forte

Top
#3211868 - 12/10/13 12:02 AM Re: Are my habits harmful to this CVT? [Re: JHZR2]
bvance554 Offline


Registered: 09/24/12
Posts: 2190
Loc: VA
Originally Posted By: JHZR2
Originally Posted By: Rand
you will actually use more gas by putting it in neutral.



Thats arguable. In theory, yes, you will because the PWM on the injectors will be re-enabled to maintain idle, as opposed to turned off when closed throttle coasting in gear.

However, if at the end of the slope maximum momentum is required, going in neutral will save the pumping losses which effectively act as a brake.

My concern in any AT type vehicle is that the transmission may not be circulating lubricant properly if the pump is on the input shaft, thus causing increased wear. IIRC, only AT vehicles with a pump on the output side can be suitably pulled/coasted without potential for damage.


Its not arguable. Leaving it in gear and coasting you will use zero gas, versus coasting neutral and using a minimal amount of gas. Given that, there is absolutely no reason to coast down hill in neutral. Maybe even a little dumb and unsafe.

Top
#3211876 - 12/10/13 12:09 AM Re: Are my habits harmful to this CVT? [Re: JHZR2]
Shannow Online   content


Registered: 12/12/02
Posts: 35935
Loc: Oz
Originally Posted By: JHZR2
My concern in any AT type vehicle is that the transmission may not be circulating lubricant properly if the pump is on the input shaft, thus causing increased wear. IIRC, only AT vehicles with a pump on the output side can be suitably pulled/coasted without potential for damage.


Been through that in my head with the 4L60E in my caprice.

In neutral and idling, the pump is still pumping. On over-run, the power flow might be reversed, but the pump is still spinning and pumping normally...even with the ignition off (or a dead fuel pump), as long as you were coming from an operational state in drive, the pump is still turning and pumping.

All scenarios are different from rolling it down a hill with the engine off from the start.

Only ever seen a couple of powerglides and an old humber that could be push started.

Top
#3211877 - 12/10/13 12:09 AM Re: Are my habits harmful to this CVT? [Re: bvance554]
gr8gatzby Offline


Registered: 11/22/05
Posts: 603
Loc: Charlotte, NC
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?
_________________________
'95 Ford F150 | 4x4 | 5.8 | 9MPG
'11 Honda Crosstour | AWD | 3.5 | 21MPG

Top
#3211878 - 12/10/13 12:10 AM Re: Are my habits harmful to this CVT? [Re: gr8gatzby]
Shannow Online   content


Registered: 12/12/02
Posts: 35935
Loc: Oz
Because you get a $180 ticket if the cop thinks you are coasting in neutral (in either an auto or manual) in my state.

Top
#3211880 - 12/10/13 12:11 AM Re: Are my habits harmful to this CVT? [Re: Shannow]
gr8gatzby Offline


Registered: 11/22/05
Posts: 603
Loc: Charlotte, NC
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.


You live in the state of North Korea?
_________________________
'95 Ford F150 | 4x4 | 5.8 | 9MPG
'11 Honda Crosstour | AWD | 3.5 | 21MPG

Top
#3211882 - 12/10/13 12:15 AM Re: Are my habits harmful to this CVT? [Re: Shannow]
Kuato Offline


Registered: 10/23/05
Posts: 6469
Loc: Colorado
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
_________________________
Oil condition is speculation until a UOA is performed.

2013 F150 5.0 4x4 SuperCab 63k on Amsoil

Thick vs Thin test: 6k / 43k miles complete


Top
Page 1 of 4 1 2 3 4 >