LOL this POST HAD ME LMAO!!!!!!!!!

 

the way the op worded the post i assumed he was talking about a MT.
I have no idea when it comes to AT
:shrugs:

 

i admit, i fxcking LOLed.
cause it's fxcking true, same goes for the paddle shift automatics, just leave it the fxck alone

 

1. Yes and No. Yes, while you're coasting No while you're sitting. While you're sitting putting it in Neutral will remove the load and allow it to rev a tiny bit higher which requires more fuel obviously. It's inconsequential really but it does. While coasting you are generally going to be revving lower if you shift into neutral. Besides you'll also gain this wonderous thing called momentum meaning you won't have to get on the gas right away after the hill.

2. Depends on who you ask I suppose. I use the **** out of every AT car I've owned and I haven't dropped one yet. So....

 

Coasting in neutral is a bad idea no matter what type of transmission you have. It's not going to change your mpg significantly and that's just common sense...and the gas pedal should always be functioning even if only for safety purposes. Putting the car in neutral to go down hill or while rounding a corner reminds me of how a beginner uses a manual transmission.

 

someone should submit this to mythbusters

 

Okay, I don't know **** about automatics, so this is for manuals only.

In a manual transmission car, if you are IN GEAR and you are NOT pressing the gas, if you are coasting (aka moving) than the injectors are COMPLETELY TURNED OFF, aka not using any gas.

If you coast in neutral then your injectors need to fire in order to keep your engine running and this it uses more gas.

 

thank you

ive tried to explain this to 'car guys' who 'work on engines' and tell me i'm an idiot for thinking that

 

Wait, wut?

If the motor is running, petrol is being consumed. I don't care what kind of tranny you've got in the car. lol

 

Nope. If you are in gear with the throttle closed(as much as it can be, with your foot off the pedal) you are using zero gasoline, in a modern fuel injected car. It's referred to as Coast On Demand Forced Ignition Shut Off. I have tested it with my scangauge, and it reads 9999 mpg when I'm coasting to a stop in gear, as long as it's above the certain RPM. If you do this and get it too low, you can actually feel the change of the injectors going back into operation. I'm pretty sure engine braking wouldn't be too effective if you were still burning the normal amount of gas in the combustion stroke.

 

I know in one of these threads somebody posted up manufacturer literature stating this. It is common knowledge in the hyper mileage world. Does it make sense? No, but it is the truth.

 

can't say about all the cars, but hondas do turn off the injectors at no load and TPS at zero. you can shut the car off and keep it in gear (MT only) on a downgrade and the engine will keep turning, the same principal applies to the honda ECU.

 

Wait, wait, wait. While the amount of fuel consumed may be close to zero or negligible there HAS to be fuel and air combining to keep the motor turning.

What you are suggesting makes it sound like inertia runs the motor while coasting.

Keep in mind automotive engineering isn't my forte' but what ya'll suggest is antithetical to how a motor runs.

 

Who said anything about the fuel injectors shutting down during coasting? During engine braking, the combustion cycle keeps the engine turning, along with the wheels. The compression cycle and engine friction is what makes the vehicle slow down at a quicker rate than coasting in neutral.

 

I am pretty sure that when any newer car is coasting (no throttle with more than say 1000RPMs) the ecu shuts off all fuel delivery. This is why people are seeing a very high mpgs when coasting with a scangage.

From Wiki:
"Coasting or gliding

The alternative to acceleration and braking is coasting. Coasting is an efficient means of slowing down, because kinetic energy is dissipated as aerodynamic drag and rolling resistance, which always must be overcome by the vehicle during travel. When coasting with the engine running and manual transmission in neutral, or clutch depressed, there will still be some fuel consumption due to the engine needing to maintain idle speed. While coasting with the engine running and the transmission in gear, most cars' ECU with fuel injection will cut off fuel supply, and the engine will continue running, being driven by the wheels. Compared to coasting in neutral, this has an increased drag, but has the added safety benefit of being able to react in any sudden change in a potential dangerous traffic situation, and being in the right gear when acceleration is required."

I also read in a mag, car and driver I think, that also states this. Here is another interesting website :http://www.ecomiling.com/lessons/lesson5.html

 

I'm not sure about the combustion cycle part, I think it is purely the momentum of the car that keeps the engine turning.

 

I have seen some test results that show rpms of a higher range actually use less fuel than at idle.

 

I leave mine in gear and get funky

 

Lock this ****ing thread already.

 

Wouldn't the engine still be taking in air? Or is there some kind of magical valve timing that keeps the valves shut while the gas pedal is not depressed? How do you explain the exhaust noise while engine braking?

 

Dammit Knightsport not you too!

If your car is in gear, your engine doesn't need any petrol to keep turning over, momentum does that. If your off the gas, no petrol is injected into the engine when your coasting above idle. The wheels keep your engine rotating. If gas was added then the rev's wouldn't drop.

 

The engine is definitely taking in air but no combustion is occurring because there is no fuel to burn.

 

Exactly. The noise is just air being compressed and passed through the exhaust system.

 

I swear someone just said there was zero fuel consumption under the aforementioned conditions. Don't look at me, I'm not the one making up ****. lol

 

No, no, no. I got that.

You couldn't "pop the clutch" in a rolling MT car to start it if that wasn't the case.

Someone said earlier that NO fuel is needed to maintain idle with the car in neutral, which is not the same as what you're saying now.

P.S. The plane will not fly.