Engine lugging in V4 mode
Race Director
Joined: Mar 2007
Posts: 11,244
Likes: 8,380
Pro
Joined: Aug 2004
Posts: 678
Likes: 279
From: Charlotte NC
I had my C8 out yesterday and picked a flat road with no traffic to try and duplicate what this topic is about. At 55 mph in auto the car was in 7th gear and just before the trans needed to go to 6th I could hear a deep harmonic rumble from the exhaust. There was no knock or ping, just that very short deep sound from the exhaust. I really think this is what people are actually hearing and it is the nature of the exhaust system. I will also agree with what was said above about getting on it to clean things out. Over on the Ferrari Forum it is known as an Italian tune up. Maybe we should call it a "Merican Tune up". 
Drifting
Joined: Aug 2022
Posts: 1,875
Likes: 782
From: Stamford, CT
Link for that?
I have a 2024 C8 and the AFM sometimes gets in a situation where I can hear the engine lugging. If you ever owned an old school manual and tried to accelerate in too high a gear, that noise.
It happens somewhere between 1000 and 1500 RPM at low load. I can get on the gas or get off the gas to stop it. Anyway...
Is there any known solution for this besides running in Manual or Track mode all the time? I don't mind AFM except for this issue. I know it's not healthy for the engine. Pretty sure it's low speed knock. When the warranty is out I will get the ECM unlocked and turn AFM off if there isn't any other options.
Update. I have determined it is not coming from the engine, it's some sort of rattle. Doing some research it seems C7's had a similar issue that was usually related to a weak serpentine belt tensioner.
It happens somewhere between 1000 and 1500 RPM at low load. I can get on the gas or get off the gas to stop it. Anyway...
Is there any known solution for this besides running in Manual or Track mode all the time? I don't mind AFM except for this issue. I know it's not healthy for the engine. Pretty sure it's low speed knock. When the warranty is out I will get the ECM unlocked and turn AFM off if there isn't any other options.
Update. I have determined it is not coming from the engine, it's some sort of rattle. Doing some research it seems C7's had a similar issue that was usually related to a weak serpentine belt tensioner.
Last edited by undecided1965; May 8, 2025 at 03:57 PM.
Thread Starter
Burning Brakes
Joined: Jun 2015
Posts: 1,183
Likes: 305
From: Shelbyville Kentucky
Melting Slicks
Joined: Apr 2021
Posts: 2,752
Likes: 2,323
From: Simi Valley, CA
2022 C8 of the Year Finalist - Modified
I agree with both of the above. The C8 will NOT lug - if it does there is something wrong and you should take it to the dealer. However, if you are not accustomed to the C8 and AFM mode you might be hearing the normal AFM sounds. Lugging is something you can feel as well as hear and the computer in the C8 will not allow it unless something is wrong.
Drifting
Joined: Aug 2022
Posts: 1,875
Likes: 782
From: Stamford, CT
There's 3 reasons for the continuation
2. Something may be wrong but it's not obvious what hence the questioning & discussion
3. Dealers are incapable of helping on something like this
