High revs at cold start
11-26-2023, 04:37 PM
#1
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High revs at cold start
Does it matter if tranny is engaged while revs are initially high at cold start or is it better to wait until RPMs settle down? I usually wait. What do others do?
11-26-2023, 04:42 PM
#2
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Sometimes I wait if I'm not in a hurry, sometimes I just let it warm up for a minute or so then go. I do watch my RPMs and avoid any spirited driving until the oil and transmission fluid temps are in the white zone.
12-15-2023, 01:33 PM
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
I wait till it revs down, I think that is healthier for the transmission, but it might be negligible.
12-15-2023, 02:48 PM
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'21 AMG53 wDPP & ARC, 19 GLC300 - Former- 10&14 ML BlueTecs, 20 GLE450 E-ABC, 15 Cayenne D, 17 Macan
The reason - it comes up to operating temperature more quickly and that's a better state to be in, as an engine.
The only reason to delay driving, is to make sure that oil is circulating throughout the engine, which only takes a few seconds with modern oils.
I agree on watching the transmission and oil temperatures before racing around. The tranny takes a while.
Last edited by mikapen; 12-15-2023 at 05:17 PM.
12-15-2023, 03:48 PM
#5
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On transmissions with a torque converter the difference between engaging at high cold idle and warm idle is not significant. The slight difference in speed will simply be absorbed by the converter. Certainly wouldn't recommend neutral drops or launches with a cold engine/transmission but driving normally is a non-issue.
12-15-2023, 08:08 PM
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PFL205.064 with M276.823 (Oil pump solenoid defeated)
The best way to warm up a vehicle is not at idle. Instead it's under a low load, as in driving gently.
The reason - it comes up to operating temperature more quickly and that's a better state to be in, as an engine.
The only reason to delay driving, is to make sure that oil is circulating throughout the engine, which only takes a few seconds with modern oils.
I agree on watching the transmission and oil temperatures before racing around. The tranny takes a while.
The reason - it comes up to operating temperature more quickly and that's a better state to be in, as an engine.
The only reason to delay driving, is to make sure that oil is circulating throughout the engine, which only takes a few seconds with modern oils.
I agree on watching the transmission and oil temperatures before racing around. The tranny takes a while.
12-15-2023, 08:59 PM
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2024 GMC Canyon Denali..... 2018 Audi SQ5
As I recall, the GLE 53 doesn’t have a torque converter like a normal automatic. (Nor any other Mercedes with the ISG.) The ISG, licensed from Continental, eliminates it. Some other ISG’s might still use a TC.
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12-16-2023, 11:31 AM
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'21 AMG53 wDPP & ARC, 19 GLC300 - Former- 10&14 ML BlueTecs, 20 GLE450 E-ABC, 15 Cayenne D, 17 Macan
The 53 has a torque converter transmission, TCT
The 63S has a dual clutch transmission, DCT.
After putting my TCT through its paces yesterday, I think AMG did a fine job on their Speedshift TCT!
(Boy does that little 6 pull hard at 135!)
The 63S has a dual clutch transmission, DCT.
After putting my TCT through its paces yesterday, I think AMG did a fine job on their Speedshift TCT!
(Boy does that little 6 pull hard at 135!)
