GM removing AFM
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GM removing AFM
I wish they would do this for the C8. Does anyone even want it in the first place?
https://finance.yahoo.com/news/gm-bu...151631874.html
https://finance.yahoo.com/news/gm-bu...151631874.html
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Mar 15, 2021, 04:14 PM
Le Mans Master
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From: One Hour From Boston!
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Unlike in the C7, it is truly seamless in the C8. If not for the indicator on the dash, I would not know when it was engaged. BTW, you can have it not active in several ways:
One of the innovations on the 2020 Stingray is the integration of AFM with a DCT. We a quite proud of how seamless we've been able to make it. We believe we are getting the efficiency benefit with virtually no compromise to the driving experience. Numerous drive impression articles have been written and I do not remember reading any negative comments about it. Bottom line is that we must balance conflicting demands and make smart choices so we can continue to offer the driving pleasure of a naturally aspirated V8 engine.
So now to the heart of your question. Yes, when you are in manual mode the engine stays in V8. That is true either by hitting the "M" button or by entering "temporary tap" by pulling one of the paddles. Temporary tap will revert to "Drive" after about 5 seconds if you don't request an additional shift in that time. AFM is also de-activated in "Track" mode. Since PTM is only available in Track mode, the answer is yes to that one too. If you are in PTM, it will be V8 only. New for 2020 is the "Z" mode which will come from the factory set up as an extra sporty mode including shift schedules pulled from the "Track" mode, so that will be V8 only. Of course, you can customize "Z" mode any way you want, so if you elect another shift pattern, AFM will return.
So now to the heart of your question. Yes, when you are in manual mode the engine stays in V8. That is true either by hitting the "M" button or by entering "temporary tap" by pulling one of the paddles. Temporary tap will revert to "Drive" after about 5 seconds if you don't request an additional shift in that time. AFM is also de-activated in "Track" mode. Since PTM is only available in Track mode, the answer is yes to that one too. If you are in PTM, it will be V8 only. New for 2020 is the "Z" mode which will come from the factory set up as an extra sporty mode including shift schedules pulled from the "Track" mode, so that will be V8 only. Of course, you can customize "Z" mode any way you want, so if you elect another shift pattern, AFM will return.
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I know it can be temporarily disabled. It's just extra complexity I don't even want.
I never had a C7 but did have a truck with it and seemed liked there were quite a few lifter failures from what I recall.
I never had a C7 but did have a truck with it and seemed liked there were quite a few lifter failures from what I recall.
Race Director
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I was dead set against it until I owned it. It's exactly like Zymurgy said in that if it wasn't for the indicator light, I wouldn't know it had engaged. I'm a bit of a fan of it now.
Le Mans Master
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Ok, but it would be a major downside if that happened, and it did happen in the trucks. (Not sure about the C7 as I didn't have one.) People probably drive trucks a lot more than Vettes which could be a factor.
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Racer
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When it returns to V8 mode, that is seamless.
IT only appears to be active in TOUR & MY MODE.
Drifting
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It works so well in my C8, I'm fine with it as a feature. It really is seamless. The only indication it even switches to V4 mode is the icon in the dash and a little less exhaust noise. But on the interstate in tour mode that's nothing bad anyway.
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It is active in Sport mode also (unless of course you are in Manual)
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Or maybe my AFM valves don't open with a slam. Multiple others report it is seamless. Maybe your valves are a problem.
Drifting
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I think the main concern is will this lead to other problems down the road with 4 cylinders going dead when driving and coming back on. I don't recall if that was ever linked to the shutter in the transmission with the C7's or not, but I think that it is things like that where the OP is coming from.
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It sure sounds like it. I took a friend of mine for a ride and he has a lot of seat time in his fathers C7. We weren't talking and I said, "it just went into 4 cylinder mode" and he was in disbelief. He said he perceived absolutely nothing and it was noticeable in the C7. It went in and out several more times and he just shook his head at how transparent the whole system was.
Burning Brakes
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Here is a link that includes AFM removal:
https://www.corvetteforum.com/forums...nce-parts.html
The C8 LT2 engine is a Generation V LS engine but check with the vendor to see if the AFM delete works with the LT2
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https://www.corvetteforum.com/forums...nce-parts.html
The C8 LT2 engine is a Generation V LS engine but check with the vendor to see if the AFM delete works with the LT2
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Last edited by B Stead; Mar 15, 2021 at 11:03 PM.