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03-04-2014, 02:15 PM | #1 |
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RPM varies, cold start, clutch in and out
I've been looking on here for awhile and I haven't seen anyone else talk about this. When I start my car cold in the morning the RPMs vary in neutral depending on if the clutch is in or out. RPM goes up slightly with the clutch in and goes down slightly with it out. Its maybe around a 50-100 rev difference. When warm I don't notice anything, seems to be mainly during the fast idle period. Just wondering in case my clutch is out of adjustment or if its just something the car is programmed to do for whatever reason.
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03-04-2014, 02:42 PM | #2 | |
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Never seen any adverse effects so i'm not concerned but i'd still like to see a more technical response. |
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03-04-2014, 03:01 PM | #3 |
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Cool thanks. I haven't seen any issues either. I too wonder the technical reason for it.
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03-04-2014, 05:08 PM | #4 |
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03-04-2014, 05:42 PM | #5 | |
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This is strictly speculation, but my first guess is that when the clutch is engaged, with all the gears being spun in the cold, and relatively thick, bath of transmission oil, there's real resistance there to be overcome when the trans is cold. De-clutch and that drag on the engine from the transmission is now removed, and so the rpms edge up a little. When the transmission oil heats up, it creates less drag, so you don't notice it much, then. ******* Do I get a prize? |
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03-04-2014, 06:34 PM | #6 | |
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03-04-2014, 07:19 PM | #7 | |
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However, you do get recognition for your excellent explanation ..... humfrz |
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03-04-2014, 10:42 PM | #8 | |
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Alright, I'll come by your place and do some donuts how bout that as a prize haha. |
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03-04-2014, 11:40 PM | #9 |
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