new zl1 dual mode exhaust

[CAM....ZL1]

Originally Posted by kaamacat

If you look at each rear muffler, on the outer edge you will see a solenoid attached. When the car is off you will also see the flap inside the outer-most
exhaust tip in the open position. When the car starts you get vacuum to that solenoid and it will close that side.

Basically when you pull the fuse it just says open. (Lots of companies have a dual-mode setup like this under the assumption you are in-town at the lower RPMs to keep it a tad quieter)

You do NOT want to disconnect the vacuum connection. Just pull the power (via fuse)

It actually is exactly reversed from the way you are explaining it. It is open at idle up to 1000rpm and closed from 1000 to 3000rpm. Then open at 3000 to red
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[kaamacat]

I looked at it as when you fire it up immediately you hear the louder exhaust for a few seconds. The actuator then closes the valve... then come 3K+ it will start to open. (I would admit i did not watch from idle-1K). I swear there is one company that makes all of these solenoids...it looks (by memory) like the ones I had on the GT3RS. I disconnected those (had to in that case at the controller up top that powered the vac unit) because the change would drive me nuts at that rpm and was to much OFF/ON"

[mmarx82]

Originally Posted by CAM....ZL1

It actually is exactly reversed from the way you are explaining it. It is open at idle up to 1000rpm and closed from 1000 to 3000rpm. Then open at 3000 to red
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This is the correct operation of the NPP Exhaust on the ZL1.