Stop Start
Burning Brakes
Joined: Mar 2021
Posts: 1,008
Likes: 767
From: Pleasant Township, OH
seriously? the 2020/2021's have that "feature" of killing the engine when stopped, then starting it when the brake is released? Is that what we are talking about here? can it be defeated, and I assume it does not engage in M mode, correct? Jeez, that's as bad as the 1st to 4th shift on the C5 (easily defeated though).
Drifting
Joined: Apr 2005
Posts: 1,757
Likes: 484
From: Portland Oregon
seriously? the 2020/2021's have that "feature" of killing the engine when stopped, then starting it when the brake is released? Is that what we are talking about here? can it be defeated, and I assume it does not engage in M mode, correct? Jeez, that's as bad as the 1st to 4th shift on the C5 (easily defeated though).
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Team Owner
Joined: Aug 2000
Posts: 24,020
Likes: 1,309
From: Spring Texas
Race Director
Joined: Aug 2019
Posts: 12,294
Likes: 14,080
From: Central Illinois
That's a reason for who, GM or the owners? I have a 2020 GM vehicle with start/stop and it sucks, my AFM is 100% invisible the only way I know it's doing its thing is the green light that says V4.
Pro
Joined: Jan 2020
Posts: 626
Likes: 466
Moderator
Joined: Dec 2002
Posts: 40,846
Likes: 4,295
From: Lakewood Ranch, FL
I guess it depends on the car. I have start stop on the AMG and the wife's 450 and it is mostly seamless. I like the AFM on the Corvette because you are saving during cruise not just while stopped. Like Phil said, you only know AFM is operating if you look for the light
Drifting
Joined: Aug 2011
Posts: 1,608
Likes: 202
From: Long Beach California
The spouse's Stinger has that annoying Start/Sop and I try to remember to press the disable button when I drive it. When it stops I always get the panicky feeling that the engine failed and I don't think I'll ever get used to it.
Race Director
Joined: Oct 2008
Posts: 16,452
Likes: 7,587
From: NJ
Another waste.. stop start.
They stopped AFM in the full size trucks for a bit due to parts shortages.
Man... that's a great truck to have lol.
AFM is a complicated time bomb.. always has been and probably will be. Best to replace with non collapsible lifters and a non AFM cam. SomethiNg I suspect won't be possible in the new GMs with their encryption..
Man... that's a great truck to have lol.
AFM is a complicated time bomb.. always has been and probably will be. Best to replace with non collapsible lifters and a non AFM cam. SomethiNg I suspect won't be possible in the new GMs with their encryption..
Safety Car
Joined: Jan 2021
Posts: 3,658
Likes: 1,937
They stopped AFM in the full size trucks for a bit due to parts shortages.
Man... that's a great truck to have lol.
AFM is a complicated time bomb.. always has been and probably will be. Best to replace with non collapsible lifters and a non AFM cam. SomethiNg I suspect won't be possible in the new GMs with their encryption..
Man... that's a great truck to have lol.
AFM is a complicated time bomb.. always has been and probably will be. Best to replace with non collapsible lifters and a non AFM cam. SomethiNg I suspect won't be possible in the new GMs with their encryption..
Due to modern engineering and manufacturing advancements, a complicated modern engine is far more reliable than an old simple engine.
Safety Car
Joined: Jan 2021
Posts: 3,658
Likes: 1,937
I think it’s more psychological than an actual driving impediment.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,621
Likes: 12,160
From: NE South Carolina
The upcoming ERay (at some point when required by law) will have to have an electric water pump. In fact I think this may be all C8's at some point. Tadge and company had to plan on that as if you look at the date of the press release link below it was about the time of the start of the C8 design. They Ferrari, Porsche etc all planed to meet the required law! No choice.
This press Release Defines what was to be law starting in 2017 and ALL Sports Cars in 2025 would require ONLY ~40 mpg NOT the average for all cars as it notes 54.5 mpg! Yep stopped by a pen in January 2017. We have another pen now!
https://obamawhitehouse.archives.gov...iency-standard
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Last edited by JerryU; Jun 25, 2021 at 09:45 AM.
Safety Car
Joined: Jan 2021
Posts: 3,658
Likes: 1,937
Not so. The starters and batteries are more robust for start stop and it only works when the engine is hot so they’re not doing the same work as needed for a cold start.