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Tsikoteer
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August 23rd, 2010 08:00 PM #11Gravity is acceleration so it will always be good for the economy of the car (just have good breaks). I only shift to N when I know I will be hitting full stop from slopes or traffic as it gives less stress to the breaks.
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August 23rd, 2010 08:06 PM #12
Well of course at a stop, the torque converter would still be working hence the minute movement of the car when you put it at D even without stepping on the gas.
So the issue really is if going in neutral early is better for the car or if it would be just as beneficial to coast the same way but in D and then just engage N once the vehicle stops.
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August 23rd, 2010 08:15 PM #13
I think it will be better to keep it at "D". mas mahal pag nasira ang transmission.
never pa akong nag shift to "N" while still moving.
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August 23rd, 2010 09:19 PM #14
Kung talagang hindi gumagalaw traffic mas mainam ilagay mo na lang sa neutral .
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Tsikot Member Rank 2
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August 23rd, 2010 09:57 PM #15put to neutral while in traffic is good to lessen the strain on the transmission and the brakes..
putting the transmission at N while moving will not damage the transmission as long as the engine is running..
the engine drops at idle when you release the accelerator is due to the torque converter.. unlike in manual, the engine is connected directly to the transmission while in automatic, the medium is liquid which is the ATF. you will not feel the engine break in A/t unless you force the transmission to downshift
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August 23rd, 2010 10:13 PM #16
Yup.
The answer is "it depends".
It depends on the speed and the situation. Sometimes it's better, sometimes it's not. Hypermilers have scangauge tools and complex calculations that show them when it's best to coast in neutral or in-gear. Your rpm will only drop down to 1000 rpm in-gear on an automatic when the car either drops to idle or if it goes into OD (high gear). The former uses a little more gas than coasting in OD. Coasting in OD uses none.
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Humps? Pocholo Ramirez before shared this tip with the guys on the Xtra Mile challenge. Don't brake for humps.
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In general, it's actually better to coast down a flyover in-gear (preferably OD)... you'll still accelerate going downhill, gaining momentum, and while you're in gear, you're using virtually no fuel at all. The momentum of your vehicle is running your engine, your alternator and your power steering pump.
Personally, I only disengage if I'm far away from a light and it's red already. If the light is just turning red, I leave it in gear for the stronger engine braking. Then I put it in neutral when I'm stopped.
Honestly, shifting to N doesn't damage the transmission. At least, nowhere near as much as the heat-build-up of leaving it in D in noon-day traffic does.
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August 26th, 2010 01:05 PM #17this is one of the best site which is giving the knowledge for Motor cycle Buy and Sell because there are lot of option for getting the source, but according the motor bike buy and sell there are lot of option for this purpose.
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September 8th, 2010 10:36 PM #18
I tried comparing coasting in D and N, as well as doing some research about it.
The feature niky was talking about is apparently called DFCO (Deceleration Fuel Cut Off), and is present in practically all new cars (A/T or M/T). However, when trying it on normal driving conditions, I noticed that coasting in D makes my engine stay at somewhere around 1200 rpm, as compared to in N, where it goes down to 900-1000. I'm quite convinced that DFCO works, but I can't convince my dad to believe in me because of the higher idle figure.
I tried explaining it to him, and from what I understand, the higher rpm is because its the wheels running the engine, not because the engine is burning fuel. Is this correct? What's the real deal?
Also, I noticed that even if DFCO is engaged in my car, I still engine brake more than if it was in N. Hence, if I don't need to lose speed but want to use gravity to keep my car moving, it appears that N is better. Is there some truth to this or am I missing a fundamental concept?
And how do I compare the consumption? On the downhill part of a flyover, coasting in N or D both give 50-99 km/l from the car's trip computer. :|
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September 9th, 2010 12:47 PM #19
True. The wheels are turning the engine, that is why the rpm is slightly higher.
And yes, true... since the engine isn't running, it's dragging the vehicle speed down (this is known as engine-braking). Yes, if you don't want to slow down, you can pop it in N to coast further.
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September 17th, 2010 12:46 PM #20
T badge premium... imagine a 1.4M car without cruise control... Sent from my Nokia 3210 using...
All New Toyota Corolla Cross