Warm Up - Page 2

Ventmaster · 05-26-2023, 09:14 PM

Quote:

Originally Posted by dpevans

This is 2023 we have fuel injection not a carb, in the days of old you had to let the engine warm up because you had a choke. Computers take care of air fuel mixture now.

Not sure who you're updating on the year and current technology, but in defense of the "the days of old", drivers were wise to pay attention to what was happening under the hood. Now we do have the luxury to start'em up and go. Just put it in 'R' or 'D' and go. But I also prefer to let things idle down and take the manual shifter thru the gates a couple of times before proceeding.

2SS Capt · 05-26-2023, 10:09 PM

All my cars I wait at least until the RPMs are below 1,000 to put it in gear, however the Camaro always gets at least a 3-5 minute warm up on a cold start before I move it... ("Cold Start" being the first start of the day or more than a few hours since it has been run)

JamesNoBrakes · 05-26-2023, 10:39 PM

The car literally tells you when it's ready, the RPMs come down to the normal idle. Now, there is some jerkyness/injection stuff as it's warming up in the first mile or so, so you can drive in a higher gear to fix that easily.

LT4Greg · 05-26-2023, 11:45 PM

I let my ZL1 warm up before pulling off even in warmer weather but especially in cold weather for sure.

yiweno · 05-27-2023, 12:32 AM

Idle until rpms go down (takes around 20 seconds). Shift before 3k rpm until engine oil starts to warm up. Then send it.

arpad_m · 05-27-2023, 01:25 AM

Quote:

Originally Posted by yiweno

Idle until rpms go down (takes around 20 seconds). Shift before 3k rpm until engine oil starts to warm up. Then send it.

This should be added to the owners manual verbatim.

GXP08jrf · 05-28-2023, 07:26 AM

When you 1st crank, the vehicle is operating in open loop until the O2 sensors can warm up and take an accurate reading to move into closed loop control. It's operating off a table and not feedback. This condition should only take a few seconds while the sensor's internal heater has the opportunity to warm up the sensing element.

You also have a period of cat light off to warm up the converters so that they'll be doing thir job. I think this takes a little longer depending on the situation. The car may have generally higher RPM and hold gears longer to generate heat to get the cats to fire, maybe dump more fuel too. This might be some of the difference you're experiencing as well.

During these conditions you might experience some drivability differences versus when the vehicle is warmed-up and approaching operating temperatures and the combustion system is in feedback control. A good tuner (of which I am not) would probably know a lot more about these interactions and the inputs to explain the performance you're seeing.

05-26-2023, 10:09 PM	#16
2SS Capt 2020 Shadow Gray 2SS Drives: 2020 2SS - A10, NPP, MRC, CAI Join Date: Dec 2019 Location: San Diego (North County), CA Posts: 2,508	All my cars I wait at least until the RPMs are below 1,000 to put it in gear, however the Camaro always gets at least a 3-5 minute warm up on a cold start before I move it... ("Cold Start" being the first start of the day or more than a few hours since it has been run) __________________ 2020 Shadow Gray Metallic 2SS - A10, NPP, MRC, Red Calipers, Carbon Flash Wheels, Black Camaro Fender Badge, Footwell Lighting *Added after delivery:* - GMP CAI, GMP Black Strut Tower Brace, SS Logo Armrest, Black Fuel Door, Stainless Sport Pedal Kit, SS Wheel Caps, Black Lugs/Locks, GM Body Color Splash Guards, DD Smoked LED Markers, Smoked Rear Reflectors, Mishimoto Catch Can, Xpel PPF - Full Front, SunTek 35% Tint, CeramicPro coating *On the left, my "fun" ride, on the right, my "work" ride, a Gulfstream G600. One's top speed is 180 Mph, the other, 620 Mph...* Last edited by 2SS Capt; 05-27-2023 at 12:18 AM.

05-26-2023, 10:39 PM	#17
JamesNoBrakes Drives: 2SS 1LE Join Date: Oct 2011 Location: AK Posts: 2,122	The car literally tells you when it's ready, the RPMs come down to the normal idle. Now, there is some jerkyness/injection stuff as it's warming up in the first mile or so, so you can drive in a higher gear to fix that easily. __________________ Everything happens for a reason, except when it doesn't, but even then, you can, in hindsight, fabricate a reason that satisfies your belief system. 2018 2SS 1LE 2022 Stinger GT-line AWD

05-26-2023, 11:45 PM	#18
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,492	I let my ZL1 warm up before pulling off even in warmer weather but especially in cold weather for sure. __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

05-27-2023, 12:32 AM	#19
yiweno Drives: Camaro zl11le Join Date: Oct 2021 Location: Vancouver Posts: 22	Idle until rpms go down (takes around 20 seconds). Shift before 3k rpm until engine oil starts to warm up. Then send it.

05-28-2023, 07:26 AM	#21
GXP08jrf Drives: 2016 1LT 'Vert Join Date: Feb 2022 Location: Midwest Posts: 140	When you 1st crank, the vehicle is operating in open loop until the O2 sensors can warm up and take an accurate reading to move into closed loop control. It's operating off a table and not feedback. This condition should only take a few seconds while the sensor's internal heater has the opportunity to warm up the sensing element. You also have a period of cat light off to warm up the converters so that they'll be doing thir job. I think this takes a little longer depending on the situation. The car may have generally higher RPM and hold gears longer to generate heat to get the cats to fire, maybe dump more fuel too. This might be some of the difference you're experiencing as well. During these conditions you might experience some drivability differences versus when the vehicle is warmed-up and approaching operating temperatures and the combustion system is in feedback control. A good tuner (of which I am not) would probably know a lot more about these interactions and the inputs to explain the performance you're seeing.

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