Sport & Track modes or all modes with it inactiveWhat is the loudest setting for the NPP exhaust.
Do you turn it to track mode? I though therenweremstill other options in track mode.
Whatcha think?
Papa
By inactive it means to take the NPP off of automatic setting. This leaves it open all the time. It will be 'loud' anytime you are feeding it gas, however regardless of setting once you are cruising and not stepping on the gas, the exhaust gets quite.Sport & Track modes or all modes with it inactive
What happens when you put it in econ mode? I've heard the back pressure is increased substantially to run V4 mode?By inactive it means to take the NPP off of automatic setting. This leaves it open all the time. It will be 'loud' anytime you are feeding it gas, however regardless of setting once you are cruising and not stepping on the gas, the exhaust gets quite.![]()
With an NPP equipped car there are 2 sets of valves. All cars have 1 set of valves. In econ mode the first set of valves before the exhaust close to dampen the unbalanced exhaust pulses and provide additional back pressure to optimize the operation in 4 cylinder mode. There are both sound and performance reasons for these valves.What happens when you put it in econ mode? I've heard the back pressure is increased substantially to run V4 mode?
That's great news! Let us know if anything strange happens down the roadI don't know if this has already been posted but I found in the C7 manual (10-39) fuses 32 and 41 control exhaust valves 1 and 2. I just pulled the fuses and my car stays loud even cruising under 1700rpms and decelerating it sounds great all the way back to idle. And no more valve squeaking. I didn't get any check engine lights for my 20 min test drive.
Please keep us updated. If you have no problems, I'm doing the same for sure!I don't know if this has already been posted but I found in the C7 manual (10-39) fuses 32 and 41 control exhaust valves 1 and 2. I just pulled the fuses and my car stays loud even cruising under 1700rpms and decelerating it sounds great all the way back to idle. And no more valve squeaking. I didn't get any check engine lights for my 20 min test drive.
I just drove it, and it sounded great. I didn't try Eco mode though. I did get a check eng light.A question for those of you that have pulled both fuses: What does the car sound like (at a steady state speed) when the computer kicks it into the V-4 mode? I have heard all along since the launch, that the engine will produce an annoying drone without the inboard set of exhaust valves active. What say you? (XP800 when you say "sounds crappy" do you mean it drones?)
Your M7 cannot go into V4 unless you are in Eco mode.I just drove it, and it sounded great. I didn't try Eco mode though. I did get a check eng light.
I know thatYour M7 cannot go into V4 unless you are in Eco mode.
I would say it was beyond drone. Boomy. A tractor was the only thing I could think of. My biggest perception was the way the sound seemed to cause more interior vibration. And there was absolutely nothing sexy about the sound. I would imagine that someone outside the car may think something was broken...A question for those of you that have pulled both fuses: What does the car sound like (at a steady state speed) when the computer kicks it into the V-4 mode? I have heard all along since the launch, that the engine will produce an annoying drone without the inboard set of exhaust valves active. What say you? (XP800 when you say "sounds crappy" do you mean it drones?)
Any takers?It takes 30 seconds to pull the fuses and try. I'd be interested in how others would describe it.