Please Help!
Thread Starter
Racer
Joined: Mar 2004
Posts: 318
Likes: 0
From: Hershey PA
Please Help!
I picked up an 07 cpe with Z06 exhaust. It has a valve behind the mufflers that appears to open and close. Is this the NPP option and if so, how do you actuate it? I didn't get any additional remotes with the car.
Thank You for your help!
Regards,
Dean
Thank You for your help!
Regards,
Dean
Race Director
Joined: Jun 2002
Posts: 12,198
Likes: 15
From: Columbia MD
NPP "dual-mode" exhaust option didn't arrive until 2008. Previous owner must have swapped out the OEM for the NPP. It opens an exhaust valve in each muffler momentarily when you start the car, and also opens the valves under acceleration at 3500 rpm, and then closes the exhaust valves when the rpms drop below 3500. Butterflies open via computer controller signal when RPMs reach a certain level. or, you can install a bypass to open and close them on demand, available from LG Motorsports (manual switch) or Mild-to-Wild from nakidparts.com, remote switch.
Moderator
Joined: Dec 2002
Posts: 40,888
Likes: 4,342
From: Lakewood Ranch, FL
If it has the Z06 Exhaust, you can control the butterflies with the NPP in a box from Ed (Pipedreams) www.nakidparts.com. I have that setup on my car and it works great. The unit is a small vacuum pump in a box with electronics and installs in the right rear cubby. On/Off is with a wireless remote. There is an option to have it open/close via rpm but I don't have that option.
Thread Starter
Racer
Joined: Mar 2004
Posts: 318
Likes: 0
From: Hershey PA
Assuming that your car is not a Z06...
If it has the Z06 Exhaust, you can control the butterflies with the NPP in a box from Ed (Pipedreams) www.nakidparts.com. I have that setup on my car and it works great. The unit is a small vacuum pump in a box with electronics and installs in the right rear cubby. On/Off is with a wireless remote. There is an option to have it open/close via rpm but I don't have that option.
If it has the Z06 Exhaust, you can control the butterflies with the NPP in a box from Ed (Pipedreams) www.nakidparts.com. I have that setup on my car and it works great. The unit is a small vacuum pump in a box with electronics and installs in the right rear cubby. On/Off is with a wireless remote. There is an option to have it open/close via rpm but I don't have that option.
Team Owner
Joined: Mar 2008
Posts: 21,502
Likes: 461
From: Southern Utah
Others will correct me if I'm wrong but I think it stays open when the car is turned off because there is no vacuum produced by the engine when it is off. So the normal state is for the valves to be open when the engine is not running. Thats why it is open momentarily when the engine starts also.
Thread Starter
Racer
Joined: Mar 2004
Posts: 318
Likes: 0
From: Hershey PA
Others will correct me if I'm wrong but I think it stays open when the car is turned off because there is no vacuum produced by the engine when it is off. So the normal state is for the valves to be open when the engine is not running. Thats why it is open momentarily when the engine starts also.
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Brett Foote
Race Director
Joined: Apr 2008
Posts: 17,373
Likes: 6
From: Chatsworth California
Others will correct me if I'm wrong but I think it stays open when the car is turned off because there is no vacuum produced by the engine when it is off. So the normal state is for the valves to be open when the engine is not running. Thats why it is open momentarily when the engine starts also.