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03-10-2019, 05:13 PM
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#1 |
 Drives: 2018 Camaro 2SS, redline edition Join Date: Jun 2013
Location: Hackettstown, NJ
Posts: 209
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AFM Valves Closing and Exhaust Flow
Does anyone have a picture of what the actual AFM exhaust valves look like?
My question is when the car goes into V4 mode and the AFM valves close, how does the exhaust exit the car? |
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03-10-2019, 05:36 PM
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#2 |
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2016 loaded 2SS
Drives: Maverick X3 Turbo R Join Date: Feb 2015
Location: United States
Posts: 242
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edited to correct info
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Last edited by hitmix300; 03-11-2019 at 07:24 PM. |
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03-10-2019, 05:37 PM
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#3 |
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Drives: 2018 Camaro 2SS, redline edition Join Date: Jun 2013
Location: Hackettstown, NJ
Posts: 209
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Thank you!
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03-10-2019, 06:18 PM
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#4 |
   Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,201
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Unfortunately I don't have a picture of the inside, although I believe it is the same part as the rear NPP valve. Although the actual butterfly valve on the AFM valve may be different, I would imagine it may have perforations in it or maybe a slight hole, as I don't think they would design it to completely block off flow. I know they do a good job of silencing the exhaust. The problem is they don't transition good enough so when the open and close when AFM activates and deactivates you definitely notice it. |
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03-10-2019, 11:13 PM
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#5 |
Drives: 2016 Camaro 1SS Red Hot Join Date: May 2016
Location: Memphis
Posts: 282
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They close fully. The valves have holes in them so the exhaust can pass through once they’re closed.
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03-11-2019, 07:18 AM
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#6 |
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Drives: 2018 Camaro 2SS, redline edition Join Date: Jun 2013
Location: Hackettstown, NJ
Posts: 209
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Thanks everyone for the replies.
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03-11-2019, 09:13 AM
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#7 |
    
Drives: 2019 ZL-1 Join Date: Feb 2009
Location: Troy, MI & Naples, FL
Posts: 2,019
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Think of a bolt washer, it has a hole in the middle. When V4 mode kicks in it closes so the sound waves are reflected back but exhaust gases exit.
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2019 ZL-1 Acquired 4/23/21 at 6300 miles. Riverside Blue, A10, PDR. Traded in 2017 2SS with 6M and 32k miles. Continental Extreme Contact Sports. Now has 10,000 miles...
2012 Yukon XL Denali w/ 6.2 AWD |
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03-11-2019, 03:08 PM
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#8 | |
Drives: HB 2SS Join Date: Apr 2017
Location: Vancouver, BC
Posts: 518
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Quote:
Check out this post: https://www.camaro6.com/forums/showthread.php?t=507367 Little further into the thread has the picture you're looking for. The valves close fully but there's a hole in the plate where it breathes. |
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03-11-2019, 06:01 PM
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#9 |
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Drives: 17 2SS, 8L90, Cam, Heads, E85 Join Date: Dec 2016
Location: US
Posts: 1,201
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You can use a scan tool and force the AFM valves closed, then you will see how much of a restriction they do make, the car will barely shift at WOT, and it screws up the torque model and makes the shifts off.
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