coasting
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Senior Member
Joined: 12-20-2008
Posts: 835
From: durham north carolina
The engine keeps turning and it's not any different than normal behavior on deceleration; in fact I couldn't tell if I was not seeing the scanguage reading.
What's the harm? The engine is still getting lubrication, and it's the transmission that is turning the engine, but other than a bit of an extra load on the transmission, I don't see what could go wrong.
Yves
What's the harm? The engine is still getting lubrication, and it's the transmission that is turning the engine, but other than a bit of an extra load on the transmission, I don't see what could go wrong.
Yves
....i will consider that it may even be benificial to the rings and cylinder walls since there is no pressure pushing the piston it may be cleaning those parts , but i doubt it.....have you ever tryed to turn an engine by hand ?....either way i would surely think that less rpms on the engine means less fricton and wear....so my next ? would be about rpms and cooling.....less the rpms = less the cooling needed , unless the engine is stopped completely and no coolant would then be circulating....so now me think -coasting good if engine is still turning low rpms , and reverse lockout is working
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Joined: 08-18-2006
Posts: 1,036
From: Hatboro, PA
[QUOTE=catdaddy137;399184....so , what about the 2 other gears ? will go down past D without the lever thingy?....is this info in my owners manual ?...i've heard of a few having issues with the auto shifter , so i've always tryed to be gentle but firm with mine....i really can't believe i put it in R , but i did.
...i get a little tired/stressed on my 275 mile a day route.[/QUOTE]
No it won't go past D. It should only bump between N & D without touching the button (lever thingy). I don't think its in the manual.
...i get a little tired/stressed on my 275 mile a day route.[/QUOTE]No it won't go past D. It should only bump between N & D without touching the button (lever thingy
). I don't think its in the manual.
Senior Member
Joined: 08-18-2006
Posts: 1,036
From: Hatboro, PA
...would want to know what the I is for more before i did it.
in D i definitely think there is a mechanical drag. As soon as i switch over the mpg shoots up. Even if it didn't though, with Less resistance I can roll a lot farther. I have to watch the speed on mine since it is technically 25 or 35 (who knows...)
in D i definitely think there is a mechanical drag. As soon as i switch over the mpg shoots up. Even if it didn't though, with Less resistance I can roll a lot farther. I have to watch the speed on mine since it is technically 25 or 35 (who knows...)
The MPG does get better if you coast. Even though there is now fuel going to the engine as opposed to the cutoff on decel, you are not linked to the drivetrain and the car will roll farther in neutral than it will in D. I know I get better mileage when I do it.
Member
Joined: 07-14-2009
Posts: 30
From: Minneapolis
I have a 5 speed manual transmission. today at speeds of about 30-45 I shifted into to 5th going down hills or on long straights on level ground. My mileage average went up .5 mpg in 20 miles with 250 total miles on the average. So I think if it went up that much in that short of time that it was really helping the mileage. I will continue this test and reset the meter and we'll see how it goes. JC
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Joined: 06-19-2008
Posts: 1,454
From: Indiana
But I guess if you got in an accident, it may come up.
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Joined: 05-13-2009
Posts: 466
From: Western North Carolina
Roller Coaster (of love)
I used to coast all the time with my old shifter (Nissan 5-speed). No coasting now with my Auto trans HHR. An automatic tranny seems to coast more anyway (in gear or not).
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Joined: 08-18-2006
Posts: 1,036
From: Hatboro, PA
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