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meangreenEG




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208 posts [100%]
Rockland NY
5-19-2007
  Cruising in neutral with Automatic Transmission?« » Reply  Edit


I know that it is smart to cruise in neutral on downhills to save gas with a manual car, but is it ok to throw it neutral with an automatic transmission?



1992 VX hatch ....SOLD
Injen SRI, Magnaflow catback exhaust 2.25" piping from cat, JDM amber corners, JDM clear taillights, Tokico Illumina 5-way adjustable shocks, Skunk2 adjustable coilovers, BLOX rear control arms, B&M shortshifter, NRG front and rear strut bars, JBL 450 watt amp



Ajax




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611 posts [97%]
5-9-2004
 « Re: Cruising in neutral with Automatic Transmission? (meangreenEG)« » Reply  Edit


Pointless in both situations.

dbrd




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44 posts [100%]
Saint Augustine FL
9-4-2007
 « Re: Cruising in neutral with Automatic Transmission? (meangreenEG)« » Reply  Edit


Pretty flat around where I live, but I do it with my manual tranny, coming down bridges and in anticipation of red lights and turns. It gets me another 2 miles per gallon with the mix of highway/urban driving I do. It is as natural as shifting gear to gear.

Cannot tell you if it is good with an auto. I won't have an auto until they offer the CVT; it drops the rpm to idle whenever you get off the gas, plus it is geared higher.

Why Honda won't offer a high mileage model with taller gears I cannot understand. I have to drive like an old man to get over 40 mpg. I think this car could easily beat 50 mpg without heroic driving technique with the right gearing.


Rick Ross




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45 posts [100%]
the internet
7-11-2008
 « Re: Cruising in neutral with Automatic Transmission? (meangreenEG)« » Reply  Edit


Quote, originally posted by meangreenEG »
I know that it is smart to cruise in neutral on downhills to save gas with a manual car, but is it ok to throw it neutral with an automatic transmission?
a manual transmission gets better mileage coasting in gear.

BudgetFitting




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135 posts [100%]
San Clemente CA
4-22-2008
 « Re: Cruising in neutral with Automatic Transmission? (Ajax)« » Reply  Edit


Quote, originally posted by Ajax »
Pointless in both situations.

What are you talking about?

Driving normally in my Fit, I got a best of 36 mpg for a tank average. When I started doing the pulse and glide (accelerating then pushing in the clutch and coasting) I got 47 mpg as a tank average.

So please explain how that is pointless...



R.I.P. 300 WHP Single Cam


Rick Ross




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45 posts [100%]
the internet
7-11-2008
 « Re: Cruising in neutral with Automatic Transmission? (BudgetFitting)« » Reply  Edit


Quote, originally posted by BudgetFitting »

What are you talking about?

Driving normally in my Fit, I got a best of 36 mpg for a tank average. When I started doing the pulse and glide (accelerating then pushing in the clutch and coasting) I got 47 mpg as a tank average.

So please explain how that is pointless...

just an FYI, but running your car with the clutch pushed in wears the throw out bearing.

claymore




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94 posts [100%]
Far side of the Moon
2-1-2006
 « Re: Cruising in neutral with Automatic Transmission? (meangreenEG)« » Reply  Edit


No problem with coasting with an auto ......AS LONG as the engine is running. Do not coast with the engine off in an auto.

jewjew bean




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413 posts [100%]
9-18-2006
 « Re: Cruising in neutral with Automatic Transmission? (Rick Ross)« » Reply  Edit


Quote, originally posted by Rick Ross »
just an FYI, but running your car with the clutch pushed in wears the throw out bearing.

more importantly, pushing the cluth in puts pressure on the thrust bearing which will cause it to wear faster. I always get on the clutch and get off as soon as possible. I leave it nuetral with the clutch out when waiting at a light.

I would not shift a tranny in to nuetral when the car is moving. I would think it would put more wear on the tranny when shifting back in to drive as it will have to catch up with with the axles. And I don't see any benifit by doing so because the tranny should be in the lowest gear possible when coasting and if the t- converter remains unlocked, the rpms with be even lower minimizing engine breaking



Are you a compression test technician?

***Will bump your FS thread for a small fee***


phootbag




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370 posts [100%]
7-19-2007
 « Re: Cruising in neutral with Automatic Transmission? (jewjew bean)« » Reply  Edit


Sorry, but you are incorrect. RPM's drop when the torque converter is locked. The torque converter locks to regain efficiency lost with a liquid coupling. The regaining of the lost efficiency in turn reduces engine rpm.

I would NEVER coast in neutral because some of your most vital systems depend on a running engine. You could lose control of your vehicle and injure or kill someone else.



They pay me to fix crap.

jewjew bean




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413 posts [100%]
9-18-2006
 « Re: Cruising in neutral with Automatic Transmission? (phootbag)« » Reply  Edit


Quote, originally posted by phootbag »
Sorry, but you are incorrect. RPM's drop when the torque converter is locked. The torque converter locks to regain efficiency lost with a liquid coupling. The regaining of the lost efficiency in turn reduces engine rpm.

I would NEVER coast in neutral because some of your most vital systems depend on a running engine. You could lose control of your vehicle and injure or kill someone else.

don't be sorry because your wrong. Under ENGINE BRAKING, an unlocked torque converter will have a lower RPM.

Before you open your mouth and say I'm wrong, go try it!



Are you a compression test technician?

***Will bump your FS thread for a small fee***


Rick Ross




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45 posts [100%]
the internet
7-11-2008
 « Re: Cruising in neutral with Automatic Transmission? (jewjew bean)« » Reply  Edit


Quote, originally posted by jewjew bean »

more importantly, pushing the cluth in puts pressure on the thrust bearing which will cause it to wear faster. I always get on the clutch and get off as soon as possible. I leave it nuetral with the clutch out when waiting at a light.

I would not shift a tranny in to nuetral when the car is moving. I would think it would put more wear on the tranny when shifting back in to drive as it will have to catch up with with the axles. And I don't see any benifit by doing so because the tranny should be in the lowest gear possible when coasting and if the t- converter remains unlocked, the rpms with be even lower minimizing engine breaking

thats it dude

phootbag




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370 posts [100%]
7-19-2007
 « Re: Cruising in neutral with Automatic Transmission? (Rick Ross)« » Reply  Edit


I misread the part about engine braking. You're right.



They pay me to fix crap.

rocksnap
(trial)

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2 posts [100%]
Granby CT
7-18-2008
 « Re: Cruising in neutral with Automatic Transmission? (claymore)« » Reply  Edit


What! You mean I am not supposed to turn off the car and take my key out while driving! Please don't tell me I have been doing something wrong!!!

nsxmatt




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8572 posts [100%]
Indiana
11-21-2001
 « Re: Cruising in neutral with Automatic Transmission? (BudgetFitting)« » Reply  Edit


Quote, originally posted by BudgetFitting »

What are you talking about?

Driving normally in my Fit, I got a best of 36 mpg for a tank average. When I started doing the pulse and glide (accelerating then pushing in the clutch and coasting) I got 47 mpg as a tank average.

So please explain how that is pointless...

No you didn't. Staying a constant speed uses less gas than accelerating a car just to let it coast then having to accelerate the car again.



94 Del Sol VTEC


BudgetFitting




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135 posts [100%]
San Clemente CA
4-22-2008
 « Re: Cruising in neutral with Automatic Transmission? (nsxmatt)« » Reply  Edit


Quote, originally posted by nsxmatt »

No you didn't. Staying a constant speed uses less gas than accelerating a car just to let it coast then having to accelerate the car again.

That is what I thought too, and I was skeptical until I tried it. For the periods you are coasting at freeway speeds (50-70 mph) you are actually getting around 250 mpg which can be confirmed by a ScanGaugeII. You will want to accelerate with 50-75% throttle to maximize your coasting times.

I am currently at 380 miles and just past half a tank, which should put me on track for 60+ mpg.

If you don't believe me, look at http://www.cleanmpg.com. Look up the pulse and glide (P&G).

It is funny though, how convinced you are that I was wrong or full of shit



R.I.P. 300 WHP Single Cam


nsxmatt




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8572 posts [100%]
Indiana
11-21-2001
 « Re: Cruising in neutral with Automatic Transmission? (BudgetFitting)« » Reply  Edit


Quote, originally posted by BudgetFitting »
That is what I thought too, and I was skeptical until I tried it. For the periods you are coasting at freeway speeds (50-70 mph) you are actually getting around 250 mpg which can be confirmed by a ScanGaugeII. You will want to accelerate with 50-75% throttle to maximize your coasting times.

I am currently at 380 miles and just past half a tank, which should put me on track for 60+ mpg.

If you don't believe me, look at http://www.cleanmpg.com. Look up the pulse and glide (P&G).

It is funny though, how convinced you are that I was wrong or full of shit

I've read the links before and unless you shut off your engine it's pointless, your still full of shit if you think your going to get 60mpg. But if you feel better speeding up and slowing down 20mph on the interstate, go right ahead. Next post you make will be how to remove a Mack truck from the back of my Honda because I was driving like a idiot.



94 Del Sol VTEC


BudgetFitting




Online

135 posts [100%]
San Clemente CA
4-22-2008
 « Re: Cruising in neutral with Automatic Transmission? (nsxmatt)« » Reply  Edit


Quote, originally posted by nsxmatt »

I've read the links before and unless you shut off your engine it's pointless, your still full of shit if you think your going to get 60mpg. But if you feel better speeding up and slowing down 20mph on the interstate, go right ahead. Next post you make will be how to remove a Mack truck from the back of my Honda because I was driving like a idiot.

My best tank average is 56.4 mpg and I am ahead of that on this tank. My P&G cycle is 70mph to 55 mph with the engine off, so the mph is still within the legal parameters .

Hate all you want, it does not bother me; I drive a Fit



R.I.P. 300 WHP Single Cam


phootbag




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370 posts [100%]
7-19-2007
 « Re: Cruising in neutral with Automatic Transmission? (BudgetFitting)« » Reply  Edit


If you create a hazard with your vehicle by slowing down, then you are doing something illegal. Not to mention, dangerous. By the way, have you thought about how much a starter will cost versus how much gas you save while shutting off/restarting your engine?

I wish I had enough time on my hands to worry about shit like this.



They pay me to fix crap.

BudgetFitting




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135 posts [100%]
San Clemente CA
4-22-2008
 « Re: Cruising in neutral with Automatic Transmission? (phootbag)« » Reply  Edit


Quote, originally posted by phootbag »
By the way, have you thought about how much a starter will cost versus how much gas you save while shutting off/restarting your engine?

I wish I had enough time on my hands to worry about shit like this.

I bump start it, so the starter does not get used .

I wish I had more time too. As a full time law student, writing for law review, and working in a law firm; time is pretty tight.



R.I.P. 300 WHP Single Cam


nsxmatt




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8572 posts [100%]
Indiana
11-21-2001
 « Re: Cruising in neutral with Automatic Transmission? (BudgetFitting)« » Reply  Edit


Quote, originally posted by BudgetFitting »
I bump start it, so the starter does not get used .

I wish I had more time too. As a full time law student, writing for law review, and working in a law firm; time is pretty tight.

Well that just filled the missing link in the puzzle...



94 Del Sol VTEC


BudgetFitting




Online

135 posts [100%]
San Clemente CA
4-22-2008
 « Re: Cruising in neutral with Automatic Transmission? (nsxmatt)« » Reply  Edit


Quote, originally posted by nsxmatt »

Well that just filled the missing link in the puzzle...


Yup



R.I.P. 300 WHP Single Cam


WebbSpeed


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10 posts [100%]
Reno NV
7-26-2008
 « « » Reply  Edit


If you have an Automatic, leave it in gear, don't put it into neutral while coasting ,it won't like going back into drive.

If you have a manual, coast in neutral, you don't have to worry about engine braking slowing you down while you're in gear.



1996 Honda Civic CX Hatch
K24 Turbo, 6 Speed, 12psi

http://www.webbspeed.com



claymore




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94 posts [100%]
Far side of the Moon
2-1-2006
 « « » Reply  Edit


How does a vehicle "like" or dislike something??

nsxmatt




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8572 posts [100%]
Indiana
11-21-2001
 « Re: (claymore)« » Reply  Edit


Quote, originally posted by claymore »
How does a vehicle "like" or dislike something??

Don't be a smartass. You know what he means.



94 Del Sol VTEC


claymore




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94 posts [100%]
Far side of the Moon
2-1-2006
 « « » Reply  Edit


Do you know what he means? could you please explain what he meant by "it" won't like going back into gear???
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