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Old 14 Jul 2008, 11:31 pm
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Default what is the best RPM to change gear in a honda accord 2008 ???

it is the us version , 4 cyl. 2.4 Lautomatic but i feel like it takes the next gear when i stop pressing on the gas pedal, i mean i can let it takes gear at any RPM what is the best to keep the engine life long.and doesn't affect it's performancekeep the engine good on the long run
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Old 14 Jul 2008, 11:46 pm
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As low an rpm as possible. For maximum fuel economy from my 2.3l 4 cylinder Ranger, up shifting at 1200 rpm worked well. It is a 5 speed manual, so that after getting into top gear I could floor it to reduce the pumping losses until reaching cruising speed.
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Old 15 Jul 2008, 12:01 am
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Sorry. You can't have both -- long engine life and maximum performance.You probably know that shifting at higher rpms gives you better acceleration. That's because your engine makes its maximum 190 horsepower at 7,000 rpms. Also, shifting at higher rpms means that your engine rpms are closer to the power peak when you finally do shift up.But engine wear is caused by two things -- stress and repetition.Higher stress happens when a part is subjected to a higher load, like when you accelerate faster than normal. If you can feel the difference in acceleration, so do the parts that move your car. "Easy does it" saves engines (and other drive train parts).Repetition is almost directly linked to rpms. The faster the engine is turning, the more frequently any spot on a moving part is moving against some other part in a unit of time. That's what causes wear. Just think -- every point in every moving part in that engine is rubbing against its mating surface 100 times a second at 6000 rpms. Higher rpms mean higher wear.The other side of the equation is fuel consumption. Slower turning engines create less friction between moving parts. Friction is one of the few factors affecting MPG that you can affect through your driving habits. Keep the rpms down and you lower friction and raise MPG.Another reason this raises your MPG is that in order to keep up with traffic while shifting up early (It's called "short shifting"), you are going to have to use more throttle.An open throttle lowers intake restriction, another one of the factors affecting MPG that you can affect through your driving habits. It's work for your engine to suck in the air it needs to mix with fuel to burn, and work takes fuel. (Think of trying to run while breathing through a dinking straw.) Your intake passages are small enough as it is, and keeping the throttle opening small just makes matters worse.Take it easy and drive safely!
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Old 15 Jul 2008, 12:16 am
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the engines are tested to withstand all of the rpms up to your redline and sometimes above that. So as far as engine life goes, as long as you stay below redline you are perfectly fine. Because you car is auto you dont really have a choice of exactly when the car will change gears. For best fuel economy stay between 2000-3200rpms.
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Old 15 Jul 2008, 12:31 am
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The best shift you can get to give you the longest engine life would be in the middle of the powerband- or for your engine about 3000-3500rpms. Your engine is made to run at that speed, although not for a long period of time. Take your foot off the gas somewhere in that range, let it downshift, and slowly accelerate more. That will give you the best engine life and also the best performance for your gallon of gas.
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