does it...?
#17
09-27-2006, 04:15 PM
Technically speaking, the act of downshifting by itself does not negatively affect fuel consumption; rather, it helps. If there is zero throttle, the car is in gear, and above 1800 rpms, the car uses ZERO fuel. So if you are engine braking/decelerating, above 1800 rpms, it actually uses less fuel than if you were in neutral.
However, if you rev-match when you downshift, then you obviously just used up the some/all of the gas that you are saving by engine-braking. <<< In no way am I suggesting that one does not rev-match when downshifting.
However, if you rev-match when you downshift, then you obviously just used up the some/all of the gas that you are saving by engine-braking. <<< In no way am I suggesting that one does not rev-match when downshifting.
#18
09-27-2006, 04:37 PM
Originally Posted by trey.hutcheson
Technically speaking, the act of downshifting by itself does not negatively affect fuel consumption; rather, it helps. If there is zero throttle, the car is in gear, and above 1800 rpms, the car uses ZERO fuel. So if you are engine braking/decelerating, above 1800 rpms, it actually uses less fuel than if you were in neutral.
However, if you rev-match when you downshift, then you obviously just used up the some/all of the gas that you are saving by engine-braking. <<< In no way am I suggesting that one does not rev-match when downshifting.
However, if you rev-match when you downshift, then you obviously just used up the some/all of the gas that you are saving by engine-braking. <<< In no way am I suggesting that one does not rev-match when downshifting.
#19
09-27-2006, 04:45 PM
If you rev-match, there is absolutely no effect on the tranny but, as you know, when you hit the gas to rev-match, you are using gas that you would not have used had you not hit the gas (basic math). If you don't rev-match, you won't use that gas, but your clutch and tranny will take the hit.
+1 on the sleeping at night.
+1 on the sleeping at night.
#20
09-28-2006, 11:31 AM
Originally Posted by TheKnite
Can anyone explain this, how could this be? Logically thinking, as long as the engine is running, it needs air and gas. I understand it would need less when you're off the throttle, but how much? I doubt it's zero fuel. I bet you cut off the fuel and the car will stall. Anyone with some knowledge on this?
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or operation
of the vehicle at excessively high speeds.
Fuel to each cylinder is cut off during deceleration, operation of the engine at excessively high speeds or operation
of the vehicle at excessively high speeds.
SYSTEM DESCRIPTION
If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine
speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies
based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.
If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine
speed is over 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies
based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.
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