High revs on start
Thread Starter
6th Gear
Joined: Dec 2019
Posts: 6
Likes: 1
From: Turlock, CA
High revs on start
I have a 2024 C8 less than 1000 miles without Z51 and no performance exhaust. On a cold start, the engine revs to 1600 rpm and I have to put it in gear to bring it down. Even on a relatively warm start, it goes into the 1200's.. I took it to the dealer where I purchased it and they had it overnight. They tried cold starts on 2 floor 2024 c8's and they said they did the same high rev starts. So no resolution.
To me, it seems excessive. When I watch YouTube videos on the C8 I'll pay very careful attention to them when they show a start and most do not show the high revs but I don't know the initial conditions.
I think this is way high and certainly my c7 doesn't do it and I feel it will lead to excessive wear.
To me, it seems excessive. When I watch YouTube videos on the C8 I'll pay very careful attention to them when they show a start and most do not show the high revs but I don't know the initial conditions.
I think this is way high and certainly my c7 doesn't do it and I feel it will lead to excessive wear.
Burning Brakes
Joined: Nov 2022
Posts: 1,047
Likes: 1,108
From: Western Mass
I wouldn't worry about it. And I wouldn't put the car in gear right away to get the initial cold start engine speed down. No need to hammer the clutch on a cold transmission. I just wait for a small amount of time for the engine rpm to come down bellow 1000 or so; then put in gear. The engine ECM knows what it's doing.
Melting Slicks
Joined: Nov 2012
Posts: 3,161
Likes: 686
From: SUFFIELD CONNECTICUT
It is normal and I hate the high rpm and very lengthy cold start of the C8. I have a 2021 and its been that way since new. all the C8's are like that. I have had 2 brand new C7s and one new 2021 Camaro SS, all 3 of those cars with the 6.2 have a 900 rpm cold start and it lasted for 15 seconds versus the awful C8 of 30 seconds and 1600 rpm. BTW, this can be tune out along with AFM.
Melting Slicks
Joined: Nov 2012
Posts: 3,161
Likes: 686
From: SUFFIELD CONNECTICUT
Race Director
Joined: Feb 2001
Posts: 11,119
Likes: 1,984
From: Grapevine Tx
2018 C3 of Year Finalist
2016 C3 of the Year Finalist
1600 rpm was the subject. Doesn't matter how or why it's there. I can hold my mild to wild switch in closed while I'm starting my GS and the valves close almost immediately, so it is actually quieter at initial start rpm than my stock C3 LT-1.
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Drifting
Joined: Feb 2023
Posts: 1,353
Likes: 1,115
Cold engine start up flare - I hate this and calibrated this out on most of the cars I worked on. It can't be good for engine longevity. This is done for emissions. And not what you think - not high CO. What do you think is the highest gas emission at start up? NOX. In the case of your Corvette, this is 'normal'.