Range device users

JFM-jr · 07-01-2016, 08:26 PM

I am wondering if this will keep the forward AFM valves open 100% of the time. The car sounds so much better at an idle when those valves are open the first 30 seconds after a cold start. Then they close and dampen the exhuast note even if the fuse is pulled on the rear NPP valves.

Glen e · 07-01-2016, 08:29 PM

Yes, it kills AFM......completely

JFM-jr · 07-01-2016, 08:35 PM

Thank you for the response

mjw930 · 07-01-2016, 09:47 PM

Yes, it will kill AFM but I'm pretty sure the AFM valves aren't closing after the motor starts up. It gets quieter because it comes off high idle. If it is the AFM valves closing its not in response to AFM because the car never goes into V4 mode at idle. I can confirm the car is no louder with the range device installed, I have one that we don't use because AFM in the LT1 works light years better than it did on the Gen 5 but when it was installed the car still quieted down as it came of high idle.

raptor5244 · 07-01-2016, 09:56 PM

Quote:

Originally Posted by mjw930

Yes, it will kill AFM but I'm pretty sure the AFM valves aren't closing after the motor starts up. It gets quieter because it comes off high idle. If it is the AFM valves closing its not in response to AFM because the car never goes into V4 mode at idle. I can confirm the car is no louder with the range device installed, I have one that we don't use because AFM in the LT1 works light years better than it did on the Gen 5 but when it was installed the car still quieted down as it came of high idle.

Yep. I think the OP is just referring the volume of the exhaust on a cold start. I can't even tell when the LT1 switches modes. I watch it on the dash switch from v4 to v8 but I can't feel it.

Algeron · 07-01-2016, 10:08 PM

Quote:

Originally Posted by raptor5244

Yep. I think the OP is just referring the volume of the exhaust on a cold start. I can't even tell when the LT1 switches modes. I watch it on the dash switch from v4 to v8 but I can't feel it.

I have had the same experience.

SSport16 · 07-01-2016, 10:14 PM

Don't bother with a Range device on the LT1, I have one with the latest FW version, even verified it with the company, keeps throwing CELs, not worth the hassle.

SuperSound · 07-02-2016, 12:08 PM

Agree with everyone else...AFM valves only close in V4 mode when crusing. NPP will go fully open on cold start then close up which is what you hear. Also not sure if everyone knows this but if I'm driving in Manual shift mode AFM will not engage regardless of drive mode or speed.

Sent from my SAMSUNG-SM-G920A using Tapatalk

JFM-jr · 07-05-2016, 08:39 PM

NPP fuse is pulled and on a cold start after about 30 seconds the volume of the exhaust note changes VERY noticeably. Id have a hard time believing its simply coming off high idle. It sure sounds like something mechanical happens to me.

Number 3 · 07-05-2016, 08:49 PM

Guessing you mean the performance exhaust which is from my experience open on start up. The exhaust valves close quickly quieting the exhaust.

This has nothing to do with exhaust valves, which by the way should NEVER stay open 100% of the time unless you want a massive destructive collision with a piston..........which is bad.

Zeke.Malvo · 07-05-2016, 09:01 PM

To add, all cars get quieter after initial startup. Most of the time it's the CATS warming up, but also just in general the exhaust warming up too. My '69 Mustang is much louder on start up.

raptor5244 · 07-05-2016, 10:50 PM

Quote:

Originally Posted by JFM-jr

NPP fuse is pulled and on a cold start after about 30 seconds the volume of the exhaust note changes VERY noticeably. Id have a hard time believing its simply coming off high idle. It sure sounds like something mechanical happens to me.

There is more to it during cold start. One of the reasons the exhaust is louder is that during a cold start the timing is retarded to meet emissions standards, etc.

When it is colder out you may notice it to be even louder as more timing is pulled during a cold start. Once the engine temp starts to rise you notice it start to come off high idle and the ECU adds more timing, which affects the exhaust note.

Ajrothm · 07-06-2016, 12:11 AM

Quote:

Originally Posted by raptor5244

There is more to it during cold start. One of the reasons the exhaust is louder is that during a cold start the timing is retarded to meet emissions standards, etc.

When it is colder out you may notice it to be even louder as more timing is pulled during a cold start. Once the engine temp starts to rise you notice it start to come off high idle and the ECU adds more timing, which affects the exhaust note.

Have you logged timing to verify this?

Engines are more efficient with more timing advance, to a degree...(no pun intended)

Zeke.Malvo · 07-06-2016, 12:33 AM

Quote:

Originally Posted by Ajrothm

Have you logged timing to verify this?

Engines are more efficient with more timing advance, to a degree...(no pun intended)

Exactly. My '69 runs louder and better mpg with more timing.

07-01-2016, 08:26 PM	#1
JFM-jr Drives: 2016 Camaro 2SS Join Date: Mar 2016 Location: Suffolk Long Island Posts: 954	Range device users I am wondering if this will keep the forward AFM valves open 100% of the time. The car sounds so much better at an idle when those valves are open the first 30 seconds after a cold start. Then they close and dampen the exhuast note even if the fuse is pulled on the rear NPP valves. __________________ 2016 Hyper Blue 2SS A8,NPP,Moonroof Pray ported factory intake manifold Ported TB Rotofab ARH 1 7/8 longtubes hi flow cats AFM deleted E85 11.0@124.9 11.65@118.8 pump gas,stock tune/exhaust New combo: Pray Performance Heads/cam MSD intake manifold and Circle D 3C 554/491 on E85 all work & tuning done by Pray

07-01-2016, 08:29 PM	#2
Glen e Retired from Car mfrs.... Drives: 2LT RS/HR-V Join Date: May 2013 Location: /Fort Lauderdale Posts: 10,048	Yes, it kills AFM......completely __________________ Glen CLICK HERE for detailing a new car: detailing for non detailers CLICK HERE for how to rinseless CLICK HERE for EASY wheel sealant

07-01-2016, 08:35 PM	#3
JFM-jr Drives: 2016 Camaro 2SS Join Date: Mar 2016 Location: Suffolk Long Island Posts: 954	Thank you for the response __________________ 2016 Hyper Blue 2SS A8,NPP,Moonroof Pray ported factory intake manifold Ported TB Rotofab ARH 1 7/8 longtubes hi flow cats AFM deleted E85 11.0@124.9 11.65@118.8 pump gas,stock tune/exhaust New combo: Pray Performance Heads/cam MSD intake manifold and Circle D 3C 554/491 on E85 all work & tuning done by Pray

07-01-2016, 10:14 PM	#7
SSport16 Drives: 2016 Garnet Red Camaro 2SS Join Date: Jul 2015 Location: North Carolina Posts: 5,435	Don't bother with a Range device on the LT1, I have one with the latest FW version, even verified it with the company, keeps throwing CELs, not worth the hassle. __________________ 2SS Camaro, Garnet Red, Adrenaline Red, NPP, MRC, A8, 5 Split Spoke Bright Silver Wheels (56W) 1100 Status - 7/24/15 (Ordered) 3800 Status - 10/13/15 (Built) 6000 Status - 12/22/15 (Delivered)

07-02-2016, 12:08 PM	#8
SuperSound Drives: '17 Camaro 2SS A8 Join Date: Jan 2015 Location: Eastern NC Posts: 5,063 View My Garage	Agree with everyone else...AFM valves only close in V4 mode when crusing. NPP will go fully open on cold start then close up which is what you hear. Also not sure if everyone knows this but if I'm driving in Manual shift mode AFM will not engage regardless of drive mode or speed. Sent from my SAMSUNG-SM-G920A using Tapatalk __________________ Current: '17 2SS Hyper Blue, A8, MRC, NPP Past: '99 SS Camaro A4, '73 Camaro 383 A3 "Voices in your head are not considered insider information." 3800 Status - 6/16/16 (Built!) 6000 status - 6/29/16 (Delivered!)

07-01-2016, 09:47 PM	#4
mjw930 Drives: 2015 Porsche BGTS, 2016 2SS Join Date: Oct 2013 Location: Ormond Beach, FL Posts: 235	Yes, it will kill AFM but I'm pretty sure the AFM valves aren't closing after the motor starts up. It gets quieter because it comes off high idle. If it is the AFM valves closing its not in response to AFM because the car never goes into V4 mode at idle. I can confirm the car is no louder with the range device installed, I have one that we don't use because AFM in the LT1 works light years better than it did on the Gen 5 but when it was installed the car still quieted down as it came of high idle.

07-05-2016, 08:39 PM	#9
JFM-jr Drives: 2016 Camaro 2SS Join Date: Mar 2016 Location: Suffolk Long Island Posts: 954	NPP fuse is pulled and on a cold start after about 30 seconds the volume of the exhaust note changes VERY noticeably. Id have a hard time believing its simply coming off high idle. It sure sounds like something mechanical happens to me. __________________ 2016 Hyper Blue 2SS A8,NPP,Moonroof Pray ported factory intake manifold Ported TB Rotofab ARH 1 7/8 longtubes hi flow cats AFM deleted E85 11.0@124.9 11.65@118.8 pump gas,stock tune/exhaust New combo: Pray Performance Heads/cam MSD intake manifold and Circle D 3C 554/491 on E85 all work & tuning done by Pray

07-05-2016, 08:49 PM	#10
Number 3 Hail to the King baby! Drives: '19 XT4 2.0T & '22 VW Atlas 2.0T Join Date: Dec 2008 Location: Illinois Posts: 12,170 View My Garage	Guessing you mean the performance exhaust which is from my experience open on start up. The exhaust valves close quickly quieting the exhaust. This has nothing to do with exhaust valves, which by the way should NEVER stay open 100% of the time unless you want a massive destructive collision with a piston..........which is bad. __________________ "Speed, it seems to me, provides the one genuinely modern pleasure." - Aldous Huxley

07-05-2016, 09:01 PM	#11
Zeke.Malvo Drives: 1969 Mustang MaCh1 Join Date: Nov 2015 Location: SJ Posts: 835	To add, all cars get quieter after initial startup. Most of the time it's the CATS warming up, but also just in general the exhaust warming up too. My '69 Mustang is much louder on start up. __________________ 1969 Pro-Touring MaCh 1 - CHP 427w 10.8 comp - 3140 lbs. - 460 rwhp / 490 rwtq T56 Magnum \|\| 14" 6 piston front / 13" 4 piston rear Wilwood brakes \|\| Hydraulic clutch \|\| 9" Detroit Locker \|\| TCP Coilovers \|\| Forgeline Wheels 18x10 275/35 front, 19x12 325/30 rear

User Name		Remember Me?
Password