NPP Exhaust Valve Controls

[XfireZ51]

Originally Posted by mike100

That studded bracket was quite useful on my installation also.

Mike,

The way I have this wired would allow me to use the wireless fob IF I can determine how to make it work. Altho don't have a ton of initiative at this point on that front.

[XfireZ51]

OK. Time to see how the check valve works.

Here's the NPP control installed in rear quarter



And then here's the NPP control working w the check valve in-line. so this will give me a ON/OFF capability depending on which way the console rocker switch is set.

[mike100]

Yeah...I gotta add an off switch to mine as well...easy enough, but where to put it?

The NPP trick is all well and good, but it is still very loud when they open up (got pulled over again). So... I need the totally turn it off when I'm in certain parts of town since the temptation to pull a gear is just too strong sometimes.

[XfireZ51]

Bolted a pair of borrowed seats from PW and so I was able to drive the car. Took it this morning for a wheel alignment. This gave me a chance to try out the NPP control. It really sounds sweet driving w the actuators closed. You get a nice purrrrr from the back. There is some 'boom" at 12-1300rpm, but flip the switch and it really gets louder. Very noticeable. The switch works just great. An hour after shutting down, the actuators were still closed indicating that the system was holding vacuum very nicely.

[Karl]

Will something like this work instead?

http://m.ebay.com/itm/150727996468?nav=SEARCH

[XfireZ51]

Mike,

I ran a ground interrupt circuit to a simple toggle switch I installed in one of the "cup holder" recesses of the console. That, together w the vacuum check valve is working well in terms of either keeping the actuators fully open or closed shut.
I'll also reiterate that a portion of the loudness and flabby sound of the exhaust is related to a "too rich" fuel mixture. I observed that sometime ago and have confirmed it with my latest tuning sessions working w injector offset values.