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Old 10-07-2013, 01:03 PM   #1241
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Quote:
Originally Posted by TheHumbleGeek View Post
Uh... What? Unless one's focus is equipped with citystop, fuel to the engine is never cut off otherwise rpms would be zero. In neutral, mine ran at around 600rpm at minimum...

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I'm speaking while in gear. My understanding was that on modern engines if you were in gear but coasting (Foot off the throttle) the computer would stop feeding fuel because you aren't asking for power? I've no source for this other than having read it various places whenever this exact subject comes up.
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Old 10-07-2013, 01:10 PM   #1242
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What they are saying is that when in gear, but off the gas, the engine's fuel is cut, but the momentum of the car keeps the motor spinning. If you put the car in neutral, the engine is than supplied fuel to idle.
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Old 10-07-2013, 01:47 PM   #1243
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Quote:
Originally Posted by MetalMuffins View Post
What they are saying is that when in gear, but off the gas, the engine's fuel is cut, but the momentum of the car keeps the motor spinning. If you put the car in neutral, the engine is than supplied fuel to idle.
To the best of my understanding, this is correct.
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Old 10-07-2013, 02:19 PM   #1244
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What they are saying is that when in gear, but off the gas, the engine's fuel is cut, but the momentum of the car keeps the motor spinning.
True above 1500 RPM.
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Old 10-07-2013, 03:18 PM   #1245
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Originally Posted by TboneZX3 View Post
True above 1500 RPM.
And at certain speeds I believe..
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Old 10-07-2013, 04:03 PM   #1246
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That's true of most modern, completely computer controlled engines. Basically turns your engine into a giant, gravity powered air pump.

I do wonder though; which is more efficient. Not burning any fuel BUT slowing the vehicle with the drag of the engine, OR idling the engine with small amounts of fuel whilst in neutral (or with the clutch in) with less drag and thus the ability to coast longer without needing to apply throttle?
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Old 10-07-2013, 06:06 PM   #1247
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Originally Posted by Romans5.8 View Post
That's true of most modern, completely computer controlled engines. Basically turns your engine into a giant, gravity powered air pump.

I do wonder though; which is more efficient. Not burning any fuel BUT slowing the vehicle with the drag of the engine, OR idling the engine with small amounts of fuel whilst in neutral (or with the clutch in) with less drag and thus the ability to coast longer without needing to apply throttle?
Using the engine to slightly slow you down while saving fuel is better before coming to a stop then idling the engine to give yourself a longer coast distance. Given that most of the time people spend coasting is before a stop I would think the current setup is the most efficient.
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Old 10-10-2013, 01:28 AM   #1248
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Originally Posted by Romans5.8 View Post
I do wonder though; which is more efficient. Not burning any fuel BUT slowing the vehicle with the drag of the engine, OR idling the engine with small amounts of fuel whilst in neutral (or with the clutch in) with less drag and thus the ability to coast longer without needing to apply throttle?
With a manual, it depends on the circumstance. In situations where you will not need the brake, coasting is more efficient. In a series of repeated 0.8* mile downhill runs (resetting the MPG ahead of each run), I got a 4.1 MPG gain by coasting and a 3.3 MPG gain by idling, then throttling as necessary to maintain comparable ETs. Engine braking adds unwanted drag ~ more fuel consumed.

BUT if you need the brake to slow (steeper hill or stop ahead), it is better to take the foot off the throttle and leave it in gear. The closed throttle will save gas and brake wear.

(* 3.3 mile loop including .8 mi. downhill; reset MPG 1/4 mi. ahead of run; start and end MPG noted for each run and averaged; beginning speed 55 MPH, end speed 45 to 50 MPG, temp. 63degrees F, 87 Octane gas; no traffic effect. Results were consistent over 4 runs.)
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Old 10-10-2013, 06:25 AM   #1249
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Quote:
Originally Posted by roderunner View Post
With a manual, it depends on the circumstance. In situations where you will not need the brake, coasting is more efficient. In a series of repeated 0.8* mile downhill runs (resetting the MPG ahead of each run), I got a 4.1 MPG gain by coasting and a 3.3 MPG gain by idling, then throttling as necessary to maintain comparable ETs. Engine braking adds unwanted drag ~ more fuel consumed.

BUT if you need the brake to slow (steeper hill or stop ahead), it is better to take the foot off the throttle and leave it in gear. The closed throttle will save gas and brake wear.

(* 3.3 mile loop including .8 mi. downhill; reset MPG 1/4 mi. ahead of run; start and end MPG noted for each run and averaged; beginning speed 55 MPH, end speed 45 to 50 MPG, temp. 63degrees F, 87 Octane gas; no traffic effect. Results were consistent over 4 runs.)
Interesting. Good work on trying to get repeatable data driven results. The only thing i would be wary about is how accurate the built in MPG calculation would be.

It would be nice to see a data log of the tests that would be able to tell us exact fuel consumption for the runs, and allow us to get (possibly) more accurate results.

Like I said through, good work on the tests / data gathered so far. Nice to see someone actually testing this.
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Old 10-10-2013, 06:54 AM   #1250
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There is a discussion about coasting to a stop in gear and in neutral with logs there are a few pages on this topic.

Found Here
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