60MPH at 2,500 RPM...then you let off the gas
12-11-2009, 01:28 PM
#1
Cruisin'
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60MPH at 2,500 RPM...then you let off the gas
If you're going 60 MPH, your RPM is going to be around 2,500. Does that drop when you let go of the gas? I changed my tranny fluid recently and I feel like there is more drag on the car when I'm at 0 throttle at high speeds. My RPM stays at 2,500 at 60MPH even when I let go of the gas. Isn't it supposed to drop a bit?
1997 Acura CL 2.2 Automatic
1997 Acura CL 2.2 Automatic
12-31-2009, 08:45 AM
#2
Racer
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Well, your rpm depends on the speed your going at... If your still going 60mph when u drop the throttle, it will still rev at 2.500 rpm..
Auto transmissions are not exactly 1:1 matched to the flywheel (its called a flex-plate for automatics) because of the torque converter, but still, there shouldn't be a noticeable difference between the 2
Auto transmissions are not exactly 1:1 matched to the flywheel (its called a flex-plate for automatics) because of the torque converter, but still, there shouldn't be a noticeable difference between the 2
12-31-2009, 09:49 AM
#3
W/ a manual trans, if you let off the throttle at 60 mph, the engine will not immediately change speed but fuel is cut-off by ECU and engine braking occurs resulting in loss of engine/car speed.
W/ an auto trans, something similar will happen immediately as the torque converter lockup directly connects engine to trans, however the TCU reduces the amount of engine braking by disabling the lockup. Then torque converter slip will reduce the amount of engine braking significantly. RPM should "jump lower" as TCU disables the torque converter lockup. There is a logic in the TCU which controls when lockup is disabled. Obviously if you decelerate to zero mph, lockup must be disabled. Occasionally, a lockup fault will cause lockup to remain active and engine will stall like a manual trans w/ clutch engaged while braking to a stop.
good luck
W/ an auto trans, something similar will happen immediately as the torque converter lockup directly connects engine to trans, however the TCU reduces the amount of engine braking by disabling the lockup. Then torque converter slip will reduce the amount of engine braking significantly. RPM should "jump lower" as TCU disables the torque converter lockup. There is a logic in the TCU which controls when lockup is disabled. Obviously if you decelerate to zero mph, lockup must be disabled. Occasionally, a lockup fault will cause lockup to remain active and engine will stall like a manual trans w/ clutch engaged while braking to a stop.
good luck
01-10-2010, 07:47 PM
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Cruisin'
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W/ a manual trans, if you let off the throttle at 60 mph, the engine will not immediately change speed but fuel is cut-off by ECU and engine braking occurs resulting in loss of engine/car speed.
W/ an auto trans, something similar will happen immediately as the torque converter lockup directly connects engine to trans, however the TCU reduces the amount of engine braking by disabling the lockup. Then torque converter slip will reduce the amount of engine braking significantly. RPM should "jump lower" as TCU disables the torque converter lockup. There is a logic in the TCU which controls when lockup is disabled. Obviously if you decelerate to zero mph, lockup must be disabled. Occasionally, a lockup fault will cause lockup to remain active and engine will stall like a manual trans w/ clutch engaged while braking to a stop.
good luck
W/ an auto trans, something similar will happen immediately as the torque converter lockup directly connects engine to trans, however the TCU reduces the amount of engine braking by disabling the lockup. Then torque converter slip will reduce the amount of engine braking significantly. RPM should "jump lower" as TCU disables the torque converter lockup. There is a logic in the TCU which controls when lockup is disabled. Obviously if you decelerate to zero mph, lockup must be disabled. Occasionally, a lockup fault will cause lockup to remain active and engine will stall like a manual trans w/ clutch engaged while braking to a stop.
good luck
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