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Old 09-30-2012, 04:59 PM   #1
zehkaiser
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Engine revs when removing foot from accelerator

Today I noticed that when I let off the accelerator my engine will rev 125-375 RPMs (1 - 3 ticks on the tach). This happens in Drive and Sport Manual mode. This was tested in 4th, 5th, and 6th gears. There is no correlation with speed or gear that determines how many RPMs it will flair, but it happens very consistently.

I have suspected this was happening for a few months, but never bothered with it. Today I did some testing when I saw it happen again.

This car has a DCT. It has the latest (as of September 27) software updates.


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Old 09-30-2012, 05:26 PM   #2
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Heavy fly wheel
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Old 09-30-2012, 05:58 PM   #3
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So it's disengaging when I let off of the gas?

Sorry for the questions... I've only dealt with traditional automatic transmission with a torque converter.
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Old 09-30-2012, 06:02 PM   #4
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I've got the MTX in mine... As I let off the gas and put the clutch in ill get the revs hanging a bit as the flywheel takes a moment to slow down.
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Old 09-30-2012, 06:02 PM   #5
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Quote:
Originally Posted by zehkaiser View Post
So it's disengaging when I let off of the gas?

Sorry for the questions... I've only dealt with traditional automatic transmission with a torque converter.
It remains in gear with the clutch applied for the current gear, but the flywheel is between the engine and the clutch pack.

This is a combination effect between the heavy flywheel (which maintains more momentum, but is slightly harder to accelerate than a light weight flywheel, and throttle programming.

The car is only in neutral when at a stand still under normal driving conditions in drive or s (auto or manual), as a clutch is always engaged when the car is driving along. It does not freewheel unless you put it into neutral manually.
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Old 09-30-2012, 06:04 PM   #6
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Thanks for all of the information, guys!
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Old 09-30-2012, 06:05 PM   #7
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Quote:
Originally Posted by Sonic_HedgeHog View Post
I've got the MTX in mine... As I let off the gas and put the clutch in ill get the revs hanging a bit as the flywheel takes a moment to slow down. Same is happening on yours, as you slow down or let off the gas one your clutches is disengaging and the engine is allowed to spin down, the weight of the fly wheel is fairly high for a small engine and takes a moment to spin and start slowing...
That's slightly different Sonic, at that point you've disengaged the clutch from the engine, where as under the op's condition the car did not disengage the clutch the second you lift your foot off of the gas pedal. The DCT has a neutral idle feature where the clutch is disengaged when at a stop or else the engine would stall, but if the car is driving along in gear then the clutch is fully engaged right until the time for the next gear change up or down.
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Old 10-01-2012, 09:16 AM   #8
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I've noticed the same thing with mine. If I'm at low RPM's and let off the gas, it seems as though the DCT is disengaging and the RPM will go up a bit. Then when I push a little on the gas, the RPM's go back like the clutch is engaging again. At higher RPM's I don't notice it happening...
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