Dual Mode Exhaust System
05-30-2010, 05:44 PM
#21
Racer
05-30-2010, 06:19 PM
#22
Burning Brakes
Member Since: Sep 2009
Location: Central Florida Sunshine State
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Another opinion...since I live in an urban area, leaving the NPP open all the time is not an option. And being all open/all closed isn't optimal, imo.
So, I compromised in order to at least hear the exhaust some of the time. I installed the little "collars" around the NPP outlet pipes (2 center ones) and have them barely cracked open all the time.
What this does is, I always have some sound from the NPP, and I get maximum sound when I floor it. But there are no issues in the urban areas from law enforcement re too much noise. A plus is I don't get drone at highway speeds either.
So, I compromised in order to at least hear the exhaust some of the time. I installed the little "collars" around the NPP outlet pipes (2 center ones) and have them barely cracked open all the time.
What this does is, I always have some sound from the NPP, and I get maximum sound when I floor it. But there are no issues in the urban areas from law enforcement re too much noise. A plus is I don't get drone at highway speeds either.
05-30-2010, 06:20 PM
#23
Melting Slicks
Well...
Without a Mild to Wild... you end up with a wimpy sounding idle... and all the mide range rpm's... To me.. NPP has no point without Mild to Wild... as.. I would hardly ever get to hear it... I am not above 3500 RPM much.
And... you can sound VERY quiet at the push of a button...Way Cool
And... you can sound VERY quiet at the push of a button...Way Cool
05-30-2010, 06:36 PM
#24
GM NPP ops sheet
"Exhaust Tail Pipe Flow Control System Description and Operation sheet, Document ID: 1661283
Normal Mode
When the vehicle is stationary with the engine running the exhaust flow control module (EFCM) commands the vacuum solenoid On, which supplies engine vacuum to both exhaust flow control valves. This causes the valves to close, diverting exhaust flow through a baffled path inside the mufflers. As vehicle speed increases, throttle position reaches 25% or greater and engine speed reaches 3500 RPM, the EFCM commands the vacuum solenoid off. This causes the valves to open, diverting exhaust flow through an un-baffled path inside the mufflers, thus enhancing engine performance.
Competition Mode
When traction control is driver disabled, vehicle speed increases, throttle position reaches 25% or greater and engine speed reaches 3000 RPM, the EFCM commands the vacuum solenoid off. This causes the valves to open; [sic] diverting exhaust flow through an un-baffled path inside the mufflers more frequently and at lower engine speeds.
The system also delays exhaust valve activity during wide-open throttle acceleration to inhibit exhaust valve actuation when the accelerator pedal is released and reapplied while shifting gears.
The ERCM has the ability to detect electrical malfunctions within the system. Any electrical malfunction detected will cause the system to be disabled and increase exhaust audibility.
The system uses the engine control module (ECM), body control module (BCM), electronic brake control module (EBCM), EFCM, exhaust flow control valve vacuum solenoid, vacuum reservoir, vacuum lines, 2 exhaust flow control valves and the serial data circuit to perform the system functions."
Normal Mode
When the vehicle is stationary with the engine running the exhaust flow control module (EFCM) commands the vacuum solenoid On, which supplies engine vacuum to both exhaust flow control valves. This causes the valves to close, diverting exhaust flow through a baffled path inside the mufflers. As vehicle speed increases, throttle position reaches 25% or greater and engine speed reaches 3500 RPM, the EFCM commands the vacuum solenoid off. This causes the valves to open, diverting exhaust flow through an un-baffled path inside the mufflers, thus enhancing engine performance.
Competition Mode
When traction control is driver disabled, vehicle speed increases, throttle position reaches 25% or greater and engine speed reaches 3000 RPM, the EFCM commands the vacuum solenoid off. This causes the valves to open; [sic] diverting exhaust flow through an un-baffled path inside the mufflers more frequently and at lower engine speeds.
The system also delays exhaust valve activity during wide-open throttle acceleration to inhibit exhaust valve actuation when the accelerator pedal is released and reapplied while shifting gears.
The ERCM has the ability to detect electrical malfunctions within the system. Any electrical malfunction detected will cause the system to be disabled and increase exhaust audibility.
The system uses the engine control module (ECM), body control module (BCM), electronic brake control module (EBCM), EFCM, exhaust flow control valve vacuum solenoid, vacuum reservoir, vacuum lines, 2 exhaust flow control valves and the serial data circuit to perform the system functions."
05-30-2010, 07:31 PM
#26
Team Owner
http://www.theredlion.us/NPPAdjust.htm
Paul
05-30-2010, 07:52 PM
#27
Team Owner
Member Since: Jun 2005
Location: Northern, VA
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St. Jude Donor '15
"In honor of jpee"
and just as a followup post, that kit is very complete including a long, thin hex tool (wire thin but very strong!) to tighten/loosen the all-stainless steel collars and screws.
05-30-2010, 08:03 PM
#28
Burning Brakes
Me too. I just got a GS w Dual Mode as well.
Can anyone tell me which fuse it is and if there is any down side to removing it?
Or perhaps you might point me to a link where I might get the M2W Kit.
Thanks!
Last edited by MikeySoft; 05-30-2010 at 08:23 PM.
05-30-2010, 08:42 PM
#29
Burning Brakes
Remove floor mat from the passenger side. Pull the panel down from the rear of the floor exposing the fuse block.
Remove the fuse located in the lower RH corner of the fuse block.
The only drawback is with the fuse removed the exhaust may be louder than desirable under certain situations, that's why the M2W controller is a great feature to add.
I run with mine in the "Wild" mode most of the time, however the drone at steady highway speeds can become an issue.
The NCM is a source for the M2W controller.
Regards,
GSRANDY
Remove the fuse located in the lower RH corner of the fuse block.
The only drawback is with the fuse removed the exhaust may be louder than desirable under certain situations, that's why the M2W controller is a great feature to add.
I run with mine in the "Wild" mode most of the time, however the drone at steady highway speeds can become an issue.
The NCM is a source for the M2W controller.
Regards,
GSRANDY
05-30-2010, 09:35 PM
#30
Burning Brakes
Remove floor mat from the passenger side. Pull the panel down from the rear of the floor exposing the fuse block.
Remove the fuse located in the lower RH corner of the fuse block.
The only drawback is with the fuse removed the exhaust may be louder than desirable under certain situations, that's why the M2W controller is a great feature to add.
I run with mine in the "Wild" mode most of the time, however the drone at steady highway speeds can become an issue.
The NCM is a source for the M2W controller.
Regards,
GSRANDY
Remove the fuse located in the lower RH corner of the fuse block.
The only drawback is with the fuse removed the exhaust may be louder than desirable under certain situations, that's why the M2W controller is a great feature to add.
I run with mine in the "Wild" mode most of the time, however the drone at steady highway speeds can become an issue.
The NCM is a source for the M2W controller.
Regards,
GSRANDY
So I just pulled the Fuse out and it did the Trick. Sounds MUCH Better. Is there any ILL EFFECTS on a new Car or any Extra Battery Drain with it running just without the Fuse?
Thanks for all the help as usual, Wow Much Much Better.
Last edited by MikeySoft; 05-30-2010 at 10:00 PM. Reason: Tried Fix / Worked Perfect.
05-31-2010, 03:35 AM
#32
Melting Slicks
ah..
Did you get the Remote? and was it hard to install?
So I just pulled the Fuse out and it did the Trick. Sounds MUCH Better. Is there any ILL EFFECTS on a new Car or any Extra Battery Drain with it running just without the Fuse?
Thanks for all the help as usual, Wow Much Much Better.
So I just pulled the Fuse out and it did the Trick. Sounds MUCH Better. Is there any ILL EFFECTS on a new Car or any Extra Battery Drain with it running just without the Fuse?
Thanks for all the help as usual, Wow Much Much Better.
05-31-2010, 08:19 AM
#33
Burning Brakes
Did you get the Remote? and was it hard to install?
So I just pulled the Fuse out and it did the Trick. Sounds MUCH Better. Is there any ILL EFFECTS on a new Car or any Extra Battery Drain with it running just without the Fuse?
Thanks for all the help as usual, Wow Much Much Better.
So I just pulled the Fuse out and it did the Trick. Sounds MUCH Better. Is there any ILL EFFECTS on a new Car or any Extra Battery Drain with it running just without the Fuse?
Thanks for all the help as usual, Wow Much Much Better.
Actually the M2W install is quite simple with the instructions provided or available for download from the web. If I can do the install, anyone can!
I chose the zero drain install method to avoid any potential battery drain issues.
Love the NPP system!
Regards,
GSRANDY
05-31-2010, 10:41 AM
#34
manual override of the NPP is definitely the way to go... I like the theory of the M2W, but thought the wireless remote controls a bit over the top as a solution... so, I just tapped the fuse and ran it through a rocker switch I mounted in the glovebox.. same effect but not as excessively gimmicky... 
I too run with it open almost all of the time...
I too run with it open almost all of the time...
06-06-2010, 02:05 AM
#37
Melting Slicks
