NPP Exhaust Issue - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

KY1LE · 04-04-2013, 04:40 PM

I just got home with my 1LE and noticed that the exhaust valve on the NPP is staying open all the time. Is this normal? I thought it would shut after start up and then be shut until over 3,000 RPM.

DuskSS · 04-04-2013, 04:50 PM

at idle/startup and below 2k it is open.
at 3k or higher it is also open.

so only if you hold the rpms in that middle range will it be closed

DuskSS · 04-04-2013, 04:53 PM

PS just yank the fuse and be done with it till you get heavily modded

sounds great going through the loud side.

only after I cammed and did my exhaust did I bother putting a mild to wild in to keep the cam at bay while chugging around.

KY1LE · 04-04-2013, 05:06 PM

Great! Thanks, I thought I had an issue already!

2014CamaroRS · 07-08-2014, 04:20 PM

is there a way to keep the chamber open in the exhaust it sounds a lot better!!!!!!

raptor5244 · 07-08-2014, 11:34 PM

Quote:

Originally Posted by 2014CamaroRS

is there a way to keep the chamber open in the exhaust it sounds a lot better!!!!!!

Yes, search for NPP fuse pull. With the fuse pulled the flap stays open all the time.

Indydriver · 07-09-2014, 04:09 AM

Quote:

Originally Posted by KY1LE

I just got home with my 1LE and noticed that the exhaust valve on the NPP is staying open all the time. Is this normal? I thought it would shut after start up and then be shut until over 3,000 RPM.

Not a 1LE but this is how mine is programmed. You can hear it close about 10 sec after cold start and hear it open at 3000.

ST1LE · 07-09-2014, 06:51 AM

Quote:

Originally Posted by Indydriver

Not a 1LE but this is how mine is programmed. You can hear it close about 10 sec after cold start and hear it open at 3000.

That's odd, it should stay open until you reach 2000rpms unless under heavy throttle.

Indydriver · 07-09-2014, 08:20 AM

Quote:

Originally Posted by ST1LE

That's odd, it should stay open until you reach 2000rpms unless under heavy throttle.

Closes backing down the driveway (which is a good thing).

HOJO · 07-09-2014, 09:51 AM

Quote:

Originally Posted by 2014CamaroRS

is there a way to keep the chamber open in the exhaust it sounds a lot better!!!!!!

There is a fuse panel in the trunk, mounted on the right side inner quarter. Remove the trunk liner, pull fuse F8 (ext flap). Reassemble and there you go.

04-04-2013, 04:40 PM	#1
KY1LE Drives: 2013 Camaro 1LE 2SS,RS,NPP Join Date: Feb 2013 Location: Mt Washington, KY Posts: 69	NPP Exhaust Issue I just got home with my 1LE and noticed that the exhaust valve on the NPP is staying open all the time. Is this normal? I thought it would shut after start up and then be shut until over 3,000 RPM.

04-04-2013, 04:50 PM	#2
DuskSS Bayou City Muscle Cars Drives: 2013 2SS Dusk Edition Join Date: Jan 2013 Location: Houston Texas Posts: 1,443	at idle/startup and below 2k it is open. at 3k or higher it is also open. so only if you hold the rpms in that middle range will it be closed __________________ 2013 2SS Dusk Edition Lethal Racing Stage V PER 418ci Forged LS3 530/520 SAE

04-04-2013, 04:53 PM	#3
DuskSS Bayou City Muscle Cars Drives: 2013 2SS Dusk Edition Join Date: Jan 2013 Location: Houston Texas Posts: 1,443	PS just yank the fuse and be done with it till you get heavily modded sounds great going through the loud side. only after I cammed and did my exhaust did I bother putting a mild to wild in to keep the cam at bay while chugging around. __________________ 2013 2SS Dusk Edition Lethal Racing Stage V PER 418ci Forged LS3 530/520 SAE

04-04-2013, 05:06 PM	#4
KY1LE Drives: 2013 Camaro 1LE 2SS,RS,NPP Join Date: Feb 2013 Location: Mt Washington, KY Posts: 69	Great! Thanks, I thought I had an issue already!

07-08-2014, 04:20 PM	#5
2014CamaroRS Drives: 2019 Camaro SS Join Date: Jul 2014 Location: ca Posts: 1	is there a way to keep the chamber open in the exhaust it sounds a lot better!!!!!!