02-12-2024, 10:41 PM | #29 | |
2020 Shadow Gray 2SS
Drives: 2020 2SS - A10, NPP, MRC, CAI Join Date: Dec 2019
Location: SoCal
Posts: 3,092
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Quote:
Even in Track Mode the NPP will close at certain RPM and throttle settings, the only way to have them open 100% of the time is either tune it that way or pull the NPP fuse (which is what I did) and they will stay open 100% of the time...
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2020 SGM 2SS - A10, NPP, MRC, Red Calipers, Black Fender Badge, Footwell Lighting
After delivery: - GMP CAI, GMP Black Strut Tower Brace, MRR017 1LE Wheels, SS Armrest, Black Fuel Door, Stainless Pedals, SS Wheel Caps, Black Lugs/Locks, GM Splash Guards, DD Smoked LED Markers, Smoked Rear Reflectors, Mishimoto Catch Can, Xpel PPF - Full Front, SunTek 35% Tint, CeramicPro coating, RST Stainless Brake Lines, Castrol SRF, MSD Super Conductor Wires Left: My "fun" ride. Right: My "work" ride: a Gulfstream G600. One's top speed is 180 Mph, the other, 620 Mph... BOTH are a lot of fun to operate... |
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02-13-2024, 07:00 AM | #30 |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,696
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They are different and neither commands the valves open all the time. There are separate tables in the tune that control valve positioning as a function of rpm and torque, and the contents of this table are different in each mode. As 2SS Capt said above, there is a small range within the track mode table (low load highway cruising) that instructs the module (not sure if it's the ECM or the FSCM / CCM, but one of the two) to close the valves.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
02-13-2024, 02:58 PM | #31 |
Drives: Camaro SS 1LE Join Date: Feb 2024
Location: Las Vegas
Posts: 67
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Do the valves fully open when starting the car for a period of time?
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02-13-2024, 05:03 PM | #32 |
Drives: Camaro Join Date: Jun 2023
Location: USA
Posts: 67
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02-13-2024, 05:18 PM | #33 |
Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016
Location: Georgia
Posts: 5,823
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Definitely in track mode they are open.
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ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.
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02-13-2024, 09:05 PM | #34 |
Drives: '23 RRT 2SS 1LE M6, '15 SIM 1LS M6 Join Date: Oct 2015
Location: Communistwealth of Massachusetts
Posts: 68
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In my experience (2SS 1LE), even shutting down in "stealth" still results in next cold start with NPP valves open. = neighbors hating
What am I missing?
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2015 SIM 1LS M6 - fun DD commute car 2023 RRT 2SS 1LE M6 w/PDR - FUN!! |
02-13-2024, 10:02 PM | #35 | |
Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017
Location: East Tennessee
Posts: 11,696
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Quote:
If fast catalyst warmup is enabled in the tune (it is by default), you will still have a little bark in the first half second or so, but then the exhaust will immediately quiet down. I personally haven't seen a Camaro with this changed or turned off, so I don't know if it's actually possible to have a fully quiet cold start.
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2018 Camaro 2SS — G7E MX0 NPP F55 IO6
735 rwhp | 665 rwtq Magnuson TVS 2300 80mm pulley | Kooks 1 7/8" LT headers | JRE smooth idle terminator cam | LT4 FS & injectors | TSP forged pistons & rods JMS PowerMAX | DSX flex fuel kit | Roto-Fab CAI | Soler 95mm LT5 TB | 1LE wheels | 1LE brakes | BMR rear cradle lockout | JRE custom tune 1100 - 1/30/18 | 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 | 3800 - 2/26/18 4300 - 2/27/18 | 4B00 - 3/01/18 4200 - 3/05/18 | 4800 - 3/14/18 5000 - 3/16/18 | 6000 - 3/19/18 |
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02-14-2024, 08:50 PM | #36 |
Drives: 2SS 1LE Join Date: Jul 2023
Location: Massachusetts
Posts: 320
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Cold starts w the NPP exhaust are just the best.
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2024 2SS 1LE | 6MT | Riverside Blue
1100 - Order submitted - 7/12/23 2000 - Order accepted - 8/22/23 Vehicle Built (per chevy chat bot) - 10/10/23 Window sticker available online - 11/4/23 Arrived at dealership - 11/10/23 |
02-14-2024, 09:09 PM | #37 |
Drives: '17 2SS convertible'20 Yukon Denali Join Date: Nov 2011
Location: Cedar Park, Texas
Posts: 2,938
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Sport mode always and fuse F51 out to keep the valves open.
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Richard
2017 2SS SIM convertible, A8, NPP, MRC, 56R wheels, GM CAI, Diode Dynamics Side Markers Delivered: 08/15/2016 #TeamBeckyD |
02-14-2024, 10:25 PM | #38 |
Drives: Camaro SS Join Date: Aug 2023
Location: Middle Park East, Liberty City
Posts: 238
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