Cold Start Question
Thread Starter
Intermediate
Joined: Oct 2014
Posts: 44
Likes: 10
From: Spring Texas
Cold Start Question
After the 500-mile reduced red line went away, upon a cold startup (Car not driven for 24 hours) my 2022 Z51 never indicated a reduced redline until the engine warmed up like my C7 showed. I am assuming it's a software issue but before I go to the dealer do all 2022's have the reduced redline appear until engine temperature is approximately 165 degrees like in the C7.
Looked in the owner's manual but the only reference I could fine was in the pamphlet "Getting to Know Your 2022 Corvette Performance Features" on page 2.
Thanks
Looked in the owner's manual but the only reference I could fine was in the pamphlet "Getting to Know Your 2022 Corvette Performance Features" on page 2.
Thanks
Le Mans Master
Joined: Jun 2002
Posts: 6,433
Likes: 3,624
From: Commerce Texas
For a high performance engine the general rule is to not do more than 4,000 rpms until the car reaches operating temperature - such is the case with, even, my 34-year-old Ferrari. Makes little difference what the electronics show... warm it up... then get on it.
Le Mans Master
Joined: Aug 2015
Posts: 8,243
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From: Southwest Florida
When you say, “warm it up” what engine temp would be considered warmed up?
Race Director
Joined: Mar 2007
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Heel & Toe
Joined: Dec 2021
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A good idea is to just drive your car normal until you see the oil warm up. I usually like to see 140 degrees F or higher before going about 4000 rpm. Good rule of thumb no matter what kind of car you are driving.
Last edited by corstyle72; Jun 2, 2022 at 08:49 AM. Reason: Left out part of the post
Race Director
Joined: Mar 2007
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Racer
Joined: Jul 2021
Posts: 381
Likes: 180
From: Gilbert, AZ
Commuting to work I never really paid attention to the redline. Anyway, this morning I watched... And this is exactly what happens with my 2022.... As the oil/engine warms up the redline raises.
Melting Slicks
Joined: Apr 2021
Posts: 2,763
Likes: 2,332
From: Simi Valley, CA
2022 C8 of the Year Finalist - Modified
Interesting - some here (even with the same model year car) say theirs does show a reduced redline until warmed up, others say not. My 2022 C8 Z51 HTC does NOT. Wonder what's going on?
Race Director
Joined: Mar 2007
Posts: 11,468
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I was not able to find anything in the Service Manual that would shed any light on exactly how the car adjusts the red line. Mine increases slowly after start up - it does not "switch". It gradually comes up to the full limit (about 6500) when "fully warmed up". But what does it measure? There's coolant temp, oil temp, and trans oil temp. There is also probably something that tells it when the CATs are full warmed up, because it adjusts timing at start up to facilitate that. But if it was any of those sensors, you would think that fault would be noticed by the car, or the driver. Makes me lean toward a software thing, but just guessing of course. I did not check, but the display changes with mode, but the displayed red line should be the same regardless.
Le Mans Master
Joined: May 2016
Posts: 7,277
Likes: 1,546
From: Florida
My AMG GTS different car but same principle, has an oil temperature gauge that displays oil temp in blue numbers then changes to white numbers when the oil temp is good to go full throttle. The change comes on at 156* F.
Instructor
Joined: Nov 2021
Posts: 140
Likes: 122
my 2022 shows the reduced redline it moves up as temperature goes up
Racer
Joined: Jan 2016
Posts: 425
Likes: 91
From: West of Boston Massachusetts
After the 500-mile reduced red line went away, upon a cold startup (Car not driven for 24 hours) my 2022 Z51 never indicated a reduced redline until the engine warmed up like my C7 showed. I am assuming it's a software issue but before I go to the dealer do all 2022's have the reduced redline appear until engine temperature is approximately 165 degrees like in the C7.
Looked in the owner's manual but the only reference I could fine was in the pamphlet "Getting to Know Your 2022 Corvette Performance Features" on page 2.
Thanks
Looked in the owner's manual but the only reference I could fine was in the pamphlet "Getting to Know Your 2022 Corvette Performance Features" on page 2.
Thanks