Those With NPP AND Aftermarket Exhaust...

Chris C 1SS 1LE · 01-26-2019, 09:39 AM

Got the 11925 installed the other day, went to pick up a fuse -- couldn't find the one I pulled.

Put fuse in, started car. Waited. Valves stay open.

Yes, wires are connected and I don't think there is a way to mess up putting the actuators on the aftermarket pipe.

Would like to hear from anyone with this same experience or wisdom!

Thanks, Chris.

cignul9 · 01-26-2019, 07:11 PM

Might be a dumb question, but did you put the exhaust in stealth mode? That's what closes the valves.

Chris C 1SS 1LE · 01-27-2019, 08:33 AM

Quote:

Originally Posted by cignul9

Might be a dumb question, but did you put the exhaust in stealth mode? That's what closes the valves.

Hello. Appreciate the thought; however functionality is a bit different than just a mode. There is no stealth mode on my vehicle either.

Chris C 1SS 1LE · 01-27-2019, 08:42 AM

Any electro-mechanical engineers out there?

At some point I'll first detach the electrical connections and hook up the multi meter to see if some DC is getting to the actuators. I've even swapped the 15 fuse out for another to see if that's the problem.

Hunch is it has to be power to actuators. Don't see how actuators can be put on the valves incorrectly.

Other part of this is the sound is amazing. No drone. Not too difficult to drive relatively quiet either. In the gas is a symphony. A veritable potpourri of auditory mana from heaven.

This impacts my motivation to troubleshoot. Bit of a PITA to disconnect the actuators wiring given space and my mits for hands too.

squish72 · 01-27-2019, 09:58 AM

Quote:

Originally Posted by Chris C 1SS 1LE

Hello. Appreciate the thought; however functionality is a bit different than just a mode. There is no stealth mode on my vehicle either.

If your car originally came with npp then it does have stealth mode

Chris C 1SS 1LE · 01-28-2019, 05:19 AM

Quote:

Originally Posted by squish72

If your car originally came with npp then it does have stealth mode

Indeed. Just saw this when in settings yesterday.

crosive · 01-28-2019, 06:17 AM

stealth closes the valves 100% of the time, even on startup.

touring opens on startup, then closes most of the time, unless you go almost wot, then they open.

sport and track open on startup and idle and most cruising until you are cruising about 40mph then they will close partially, but always open 100% on wot and close to it.

kropscamaro16 · 01-28-2019, 11:17 AM

haha tried to start my car in stealth mode with longtubes and exhaust and npp

car did not sound happy lol

Shawnqa800720 · 01-30-2019, 01:21 PM

Quote:

Originally Posted by crosive

stealth closes the valves 100% of the time, even on startup.

touring opens on startup, then closes most of the time, unless you go almost wot, then they open.

sport and track open on startup and idle and most cruising until you are cruising about 40mph then they will close partially, but always open 100% on wot and close to it.

Mine will not close on startup. I've put in touring mode before parking, and set it to stealth in the screen, and it still opens up with a huge bark before quieting down...

This happen to anyone else??

squish72 · 01-30-2019, 01:49 PM

Quote:

Originally Posted by Shawnqa800720

Mine will not close on startup. I've put in touring mode before parking, and set it to stealth in the screen, and it still opens up with a huge bark before quieting down...

This happen to anyone else??

should never open in stealth. here is the exhaust rumble on a factory file, 0 touring, 1 sport, 2 track, 3 stealth.

0,1,2 are active meaning they open when you first start it
3 is off so it should stay shut during start up

fivewunoh · 01-30-2019, 02:12 PM

What does the "exhaust rumble enable" do?
Is that what creates the pops and crackles?

Shawnqa800720 · 01-30-2019, 02:21 PM

Quote:

Originally Posted by squish72

should never open in stealth. here is the exhaust rumble on a factory file, 0 touring, 1 sport, 2 track, 3 stealth.

0,1,2 are active meaning they open when you first start it
3 is off so it should stay shut during start up

I know it should never open in stealth, but my neighbors and wife beg to differ. Not sure how to diagnose what is happening.

crosive · 01-30-2019, 02:30 PM

Quote:

Originally Posted by Shawnqa800720

I know it should never open in stealth, but my neighbors and wife beg to differ. Not sure how to diagnose what is happening.

the valves are easy to see from the backside. just look at them while the car is started. in stealth mode they shouldn't move at all. in touring mode, they should open, then close shortly after starting.

my car is by no means quiet, but it is noticeably quieter when started in stealth mode.

Karl Carson · 01-30-2019, 02:37 PM

Mine has open exhaust on start up even in stealth also. Pretty loud on start up but it settles down pretty quick.

01-26-2019, 09:39 AM	#1
Chris C 1SS 1LE Drives: 2017 1LE Join Date: Nov 2017 Location: Brooks, GA Posts: 697	Those With NPP AND Aftermarket Exhaust... Got the 11925 installed the other day, went to pick up a fuse -- couldn't find the one I pulled. Put fuse in, started car. Waited. Valves stay open. Yes, wires are connected and I don't think there is a way to mess up putting the actuators on the aftermarket pipe. Would like to hear from anyone with this same experience or wisdom! Thanks, Chris. __________________ '17 Bright Yellow 1LE. PDR, STB, !CAGS Borla 60606, 11925. Tony Mamo ported TB, ROTOFAB, !Sound Tube

01-26-2019, 07:11 PM	#2
cignul9 Drives: 50th 2SS MRC A8 NPP Join Date: Jan 2017 Location: ATX Posts: 259	Might be a dumb question, but did you put the exhaust in stealth mode? That's what closes the valves. __________________ Club F1FTY 50th 2SS, MRC, NPP, 8A, #991 Join the Club F1FTY Registry! Add yourself to the registry here. Read the registry here.

01-27-2019, 08:42 AM	#4
Chris C 1SS 1LE Drives: 2017 1LE Join Date: Nov 2017 Location: Brooks, GA Posts: 697	Any electro-mechanical engineers out there? At some point I'll first detach the electrical connections and hook up the multi meter to see if some DC is getting to the actuators. I've even swapped the 15 fuse out for another to see if that's the problem. Hunch is it has to be power to actuators. Don't see how actuators can be put on the valves incorrectly. Other part of this is the sound is amazing. No drone. Not too difficult to drive relatively quiet either. In the gas is a symphony. A veritable potpourri of auditory mana from heaven. This impacts my motivation to troubleshoot. Bit of a PITA to disconnect the actuators wiring given space and my mits for hands too. __________________ '17 Bright Yellow 1LE. PDR, STB, !CAGS Borla 60606, 11925. Tony Mamo ported TB, ROTOFAB, !Sound Tube

01-28-2019, 11:17 AM	#8
kropscamaro16 Drives: 2016 1ss camaro Join Date: Feb 2016 Location: 909 Posts: 9,830	haha tried to start my car in stealth mode with longtubes and exhaust and npp car did not sound happy lol __________________ 16 1SS NIGHTFALL GRAY METALLIC WITH NPP #BECAUSERACECAR #SAVETHEMANUALS

01-30-2019, 02:37 PM	#14
Karl Carson SHRFT Drives: 2017 2SS vert 50 anniversary Join Date: Dec 2018 Location: Calgary AB Canada Posts: 34	Stealth on start up Mine has open exhaust on start up even in stealth also. Pretty loud on start up but it settles down pretty quick. __________________ Even though all the mosquitoes are roasting in HELL, I still don't like winter.

01-28-2019, 06:17 AM	#7
crosive Drives: 18 zl1 Join Date: Aug 2017 Location: central alabama Posts: 935	stealth closes the valves 100% of the time, even on startup. touring opens on startup, then closes most of the time, unless you go almost wot, then they open. sport and track open on startup and idle and most cruising until you are cruising about 40mph then they will close partially, but always open 100% on wot and close to it.

01-30-2019, 02:12 PM	#11
fivewunoh Drives: 18 NFG 1ss M6 Join Date: Mar 2017 Location: Bay Area, CA Posts: 129	What does the "exhaust rumble enable" do? Is that what creates the pops and crackles?

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