S2000 Under The Hood S2000 Technical and Mechanical discussions.

cruising in neutral

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Old 03-30-2006, 11:01 AM
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Default cruising in neutral

Anybody know of any known damage to the engine or transmission if the car is in neutral on a down hill stretch of road???
Old 03-30-2006, 11:11 AM
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No damage to powertrain that I can think of, but this practice is poor driving skill. Why would you want to do this anyway? You need the tranny in gear and connected to the engine to have full control of your vehicle.
Old 03-30-2006, 04:31 PM
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your car will explode! dont do it!
Old 03-30-2006, 04:33 PM
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btw:

Cruising = leisurely drive

COASTING = driving without engine power.
Old 03-30-2006, 04:56 PM
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Originally Posted by trabman,Mar 30 2006, 02:01 PM
Anybody know of any known damage to the engine or transmission if the car is in neutral on a down hill stretch of road???
You'll just gain a lot of speed in neutral down a hill, so you'll have to use your brakes quite a bit to keep a constant speed.

If you leave it in gear engine braking will ensure that you keep a fairly constant speed without the need for brakes.

Also, you don't have much control over the car when it's not in gear. When the car is in gear you have the ability to give it power in an emergency situation.
Old 03-31-2006, 08:13 AM
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Originally Posted by koala,Mar 30 2006, 05:56 PM
you don't have much control over the car when it's not in gear. When the car is in gear you have the ability to give it power in an emergency situation.


Having control of your car at all times is best practice.

"COASTING" in neutral is the same as coasting to a stop instead of properly downshifting to the correct gear.... both are bad practices IMO.

Tim
Old 03-31-2006, 08:24 AM
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but doesnt coasting down a hill save gas?
Old 03-31-2006, 08:30 AM
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Coasting uphill saves more.
Old 03-31-2006, 08:35 AM
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Originally Posted by Ztopgun28,Mar 31 2006, 09:24 AM
but doesnt coasting down a hill save gas?
Not as much as just staying at home....
Old 03-31-2006, 09:10 AM
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Originally Posted by Ztopgun28,Mar 31 2006, 10:24 AM
but doesnt coasting down a hill save gas?
NO! "Coasting" as you describe it, where you have it in neutral with the clutch out, requires the engine to idle. This uses fuel. Having it in gear and rolling down an incline with the throttle closed, shuts down the injectors completely. This uses NO fuel. You decide.
I kinda thought you did this thinking it would save fuel. In this case, it's false economy and false reasoning. Not only do you not save fuel, you are relinquishing control over your car.
Not necessarily on this car, but on some cars, putting it into neutral when rolling confuses the hell out of the ECU. The engine revs sporadically and without much control. The ECU hates this.


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