ok, ive googled it and every where i go there is always two sides to it.
i wanna know what GDD thinks about this

1.Does Coasting/shifting to Neutral on a stop or downhill really saves gas?

2.Is it safe doing it on a AT?

DISCUSS.

 

no, it saves gas to leave it IN gear

 

Why put it in neutral at a stop? My car revs higher in N than if it was in drive. Going in and out of neutral all the time on an AT is bad for it.

 

It saves gas to stay at home and not drive any where.

 

Yes, but in gear your engine is under more load.

 

I always do it. I always assume that if your car is in gear, opposed to being in neutral, the engine is always going to be at a higher RPM, generally sucking more gas. But I'm not smart about these things, so don't flame. I just do neutral downhill and then revmatch (not too much) when gassing again.

 

what kind of idiot would do this in an AT car?

 

nope

 

^---How is that not true?

Perhaps you have an ECU problem.

 

When you are off the gas in an automatic it might as well be in neutral if the torque converter is unlocked. Even if the converter locks and you downshift, if you aren't on the throttle no fuel will be injected into engine on most modern cars. Basically shifting into neutral to coast in an auto is pretty pointless.

 

I rev match in my AT.

 

Drive a MT, problem solved.

 

If you don't have your foot on the gas no fuel is going to your engine save for what it takes to idle, the engine is just spinning with the drivetrain.

 

My car does that for me.

 

Come to think of it, I haven't driven an AT in a while, but would the engine speed not drop, when in neutral?

 

It would, but the engine speed is irrelevant because if you are off the throttle there is no fuel being injected. I guess you could have the slight advantage of being able to coast slightly longer in N than in D, but I doubt it would be worth the extra wear on the trans.

 

I ghostride the whip every chance I get.

 

You use more gas putting it into neutral than you do keeping it in gear and engine braking with your foot off the gas.

 

lol people just dont understand AT's

you put it in freaking D and leave it the **** alone

unless you want to park or reverse

if you want to **** with your shifter you should have gotten a manual

i'm curious how long a honda auto would last putting it into neutral at every light.

 

If you're not moving, it does very little damage.

But what would be the point of putting it in neutral at a light?

 

actually i meant coming to a stop at every light. i need to slow the **** down when i post!

 

get out of gear and throw it in neutral!

 

Thats a good question, but my gut tells me you'll save more gas by leaving the car in gear as you throttle down.

By placing the car in neutral and letting off the gas (closed throttle@idle) your ECM/ECU adjusts your engines air/fuel ratio to "rich" condition for the purpose of idle characteristics, so your injectors are firing more fuel by volume each time an injector fires as the motor idles.

The only benefit I see to this is that your idling, which translates into your fuel injectors firing less frequently as oppose to at higher engine speeds.

By leaving your car in gear as you let off the throttle your ECM/ECU adjusts your air/fuel ratios to a "leaner" condition for the purpose of throttle response under sudden acceleration, as not to "flood" the engine with fuel under closed throttle while the injectors are firing at a more rapid rate at higher engine speeds than idle.

Of course by idling down in gear, your injectors are firing less fuel by volume each time they fire, but at a more frequent rate since your not idling.

 

just turn the engine off after you put it in neutral