How to tune out NPP? - CorvetteForum - Chevrolet Corvette Forum Discussion

Notices
C7 Tech/Performance Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

How to tune out NPP?

Old 10-10-2018, 07:45 AM
  #1  
jimxms
CF Senior Member
Thread Starter
 
Member Since: Jul 2011
Posts: 436
Thanked 21 Times in 16 Posts
Default How to tune out NPP?

I've heard people mention that they have managed to prevent the NPP valves from closing in tuning, but my tuner tells me that the NPP is controlled by the BCM not the ECM and therefore it cannot be modified as part of a normal tune.

How do I go about disabling NPP entirely for sport/track modes but leave it enabled for Eco? I have Diablosport, HPTuners and a Drewtech J2534 at my disposal.
jimxms is offline  
Old 10-10-2018, 08:12 AM
  #2  
hcvone
CF Senior Member
Support Corvetteforum!
 
Member Since: Aug 1999
Location: Huntingdon Valley Pa
Posts: 18,466
Thanked 251 Times in 207 Posts
Default

Originally Posted by jimxms View Post
I've heard people mention that they have managed to prevent the NPP valves from closing in tuning, but my tuner tells me that the NPP is controlled by the BCM not the ECM and therefore it cannot be modified as part of a normal tune.

How do I go about disabling NPP entirely for sport/track modes but leave it enabled for Eco? I have Diablosport, HPTuners and a Drewtech J2534 at my disposal.
I replace the exhaust on everything I own, on the Z06 and ZR1 I have Akrapovic and installed Mild to Wild switch, the valves are always open, unless I use the supplied remotes to close the valves, for me this works great, I never touch the dash settings
hcvone is offline  
Old 10-10-2018, 10:03 AM
  #3  
jimxms
CF Senior Member
Thread Starter
 
Member Since: Jul 2011
Posts: 436
Thanked 21 Times in 16 Posts
Default

Originally Posted by hcvone View Post
I replace the exhaust on everything I own, on the Z06 and ZR1 I have Akrapovic and installed Mild to Wild switch, the valves are always open, unless I use the supplied remotes to close the valves, for me this works great, I never touch the dash settings
Good call on the mild to wild. I may have to go that route if there is no simple software fix.
jimxms is offline  
Old 10-10-2018, 10:11 AM
  #4  
RonC7
CF Senior Member
 
RonC7's Avatar
 
Member Since: Dec 2012
Location: St. Louis Metro East IL
Posts: 828
Thanked 168 Times in 133 Posts
Default

Pull the fuse.
RonC7 is offline  
Old 10-10-2018, 10:16 AM
  #5  
jimxms
CF Senior Member
Thread Starter
 
Member Since: Jul 2011
Posts: 436
Thanked 21 Times in 16 Posts
Default

Originally Posted by RonC7 View Post
Pull the fuse.
You miss the point dude. I want to be able to still use NPP in eco mode.
jimxms is offline  
Old 10-10-2018, 10:18 AM
  #6  
Wandering Scot
CF Senior Member
 
Member Since: Jul 2011
Posts: 260
Thanked 2 Times in 1 Post
St. Jude Donor '13
Default

You can wire in a remote.
Build it for under $20 using parts on Amazon.
Once you have it installed you can pair it with the Homelink buttons and not have to have a separate remote.
Wandering Scot is offline  
The Following 2 Users Say Thank You to Wandering Scot For This Useful Post:
A320Flyer (10-11-2018), Harbgrogan (10-12-2018)
Old 10-10-2018, 10:24 AM
  #7  
BrunoTheMellow
CF Senior Member
 
BrunoTheMellow's Avatar
 
Member Since: Jan 2015
Posts: 1,430
Thanked 225 Times in 174 Posts
Default

Originally Posted by Wandering Scot View Post
You can wire in a remote.
Build it for under $20 using parts on Amazon.
Once you have it installed you can pair it with the Homelink buttons and not have to have a separate remote.
Oh that's nice.

OP. Do you really mind the small amount of time the exhaust goes quiet in TRACK mode setting? I got used to go to the settings menu and swapping between track/auto. I don't go to stealth as I rather not gun my supercharged car and forget to open it first. At least in auto and in TOUR it will open up before it becomes too restrictive.
BrunoTheMellow is offline  
Old 10-10-2018, 10:32 AM
  #8  
DAVE396LT1
CF Senior Member
 
DAVE396LT1's Avatar
 
Member Since: Jul 2003
Location: Redmond WA
Posts: 7,215
Thanked 1,364 Times in 909 Posts
Default

I wish Tr was "Track" and just held them open. If I needed Sport at the track, it's there. But there's no "always open" mode. If I had access to the BCM, I'd change it in there!
DAVE396LT1 is offline  
The Following User Says Thank You to DAVE396LT1 For This Useful Post:
JerryU (10-10-2018)
Old 10-10-2018, 10:34 AM
  #9  
jimxms
CF Senior Member
Thread Starter
 
Member Since: Jul 2011
Posts: 436
Thanked 21 Times in 16 Posts
Default

Originally Posted by Wandering Scot View Post
You can wire in a remote.
Build it for under $20 using parts on Amazon.
Once you have it installed you can pair it with the Homelink buttons and not have to have a separate remote.
Do tell me more! Do you have a link?
jimxms is offline  
Old 10-10-2018, 10:41 AM
  #10  
jimxms
CF Senior Member
Thread Starter
 
Member Since: Jul 2011
Posts: 436
Thanked 21 Times in 16 Posts
Default

Originally Posted by BrunoTheMellow View Post
OP. Do you really mind the small amount of time the exhaust goes quiet in TRACK mode setting? I got used to go to the settings menu and swapping between track/auto. I don't go to stealth as I rather not gun my supercharged car and forget to open it first. At least in auto and in TOUR it will open up before it becomes too restrictive.
With decat headers, x-pipe and lopey cam the car sounds like sh*t when the NPP close. I thought my engine was screwed when I first took it out for a drive after adding those mods.

i only want to keep it operational for when the wife is in the car.
jimxms is offline  
Old 10-10-2018, 10:52 AM
  #11  
TriPinTaZ
CF Senior Member
 
TriPinTaZ's Avatar
 
Member Since: Mar 2004
Posts: 1,436
Thanked 111 Times in 83 Posts
Default

Originally Posted by jimxms View Post
I've heard people mention that they have managed to prevent the NPP valves from closing in tuning, but my tuner tells me that the NPP is controlled by the BCM not the ECM and therefore it cannot be modified as part of a normal tune.

How do I go about disabling NPP entirely for sport/track modes but leave it enabled for Eco? I have Diablosport, HPTuners and a Drewtech J2534 at my disposal.
HPTuners allows you to license the BCM and tune its parameters but it takes 2 additional credits. Your tuner needs to do some studying because you can absolutely tune the NPP system to operate the way you want it to. I've done it myself to my Z51. It's awesome.
TriPinTaZ is offline  
The Following User Says Thank You to TriPinTaZ For This Useful Post:
A320Flyer (10-11-2018)
Old 10-10-2018, 10:55 AM
  #12  
TriPinTaZ
CF Senior Member
 
TriPinTaZ's Avatar
 
Member Since: Mar 2004
Posts: 1,436
Thanked 111 Times in 83 Posts
Default

Originally Posted by DAVE396LT1 View Post
I wish Tr was "Track" and just held them open. If I needed Sport at the track, it's there. But there's no "always open" mode. If I had access to the BCM, I'd change it in there!
You can access the BCM using HPTuners. You might need to use the Beta version for the NPP controls (thats what I use). It does take 2 credits to license the BCM.

I've set my Track Mode to never close the NPP valves so now when I go to track mode it is just like pulling the fuse, always open 100% of the time. You can even tune Sport Mode to close the valves partially so that Sport mode is softer at low speeds and then queit at highway speeds. Then Tour mode is quiet always below 4500 RPM. And Track mode is god awful loud all of the time. Works great for my car because I have full headers and Borla exhaust.

Last edited by TriPinTaZ; 10-10-2018 at 10:56 AM.
TriPinTaZ is offline  
Old 10-10-2018, 11:36 AM
  #13  
Wandering Scot
CF Senior Member
 
Member Since: Jul 2011
Posts: 260
Thanked 2 Times in 1 Post
St. Jude Donor '13
Default

Originally Posted by jimxms View Post


Do tell me more! Do you have a link?
You need these:

https://www.amazon.com/gp/aw/d/B00EQB8O7K?psc=1&ref=yo_pop_mb_pd_title https://www.amazon.com/gp/aw/d/B00EQB8O7K?psc=1&ref=yo_pop_mb_pd_title

https://www.amazon.com/gp/aw/d/B00OZGA8O8?psc=1&ref=yo_pop_mb_pd_title https://www.amazon.com/gp/aw/d/B00OZGA8O8?psc=1&ref=yo_pop_mb_pd_title

I donít have a schematic handy but I can draw one tonight.
The 2 black wires get joined to a larger ring terminal and go to ground.
The red fuse wire goes to the white remote wire.
You will need a small crimp spade terminal for the red remote wire.
That wire goes to the r/h lower fuse terminal.
The blue wire is antenna.
Take the fuse out of the NPP and put it into the upper fuse position.
Plug the assembly into the vacant NPP fuse.
You will need to make a small notch in the fuse cover for the wires to pass through.
Pair with the Homelink as directed in the owners manual.
The whole thing takes maybe 15 minutes.

Last edited by Wandering Scot; 10-10-2018 at 11:50 AM.
Wandering Scot is offline  
Old 10-10-2018, 12:04 PM
  #14  
sevinn
CF Senior Member
Support Corvetteforum!
 
sevinn's Avatar
 
Member Since: Jul 2009
Location: Baton Rouge LA
Posts: 3,388
Thanked 115 Times in 109 Posts
St. Jude Donor '14, '16
Default

Originally Posted by TriPinTaZ View Post
HPTuners allows you to license the BCM and tune its parameters but it takes 2 additional credits. Your tuner needs to do some studying because you can absolutely tune the NPP system to operate the way you want it to. I've done it myself to my Z51. It's awesome.
I built a mild to wild but will probably end up going this route. I believe I've logged everything I need to know to get this to work the way I want but it hurts to pay 2 credits for it lol
sevinn is offline  
Old 10-10-2018, 12:31 PM
  #15  
jimxms
CF Senior Member
Thread Starter
 
Member Since: Jul 2011
Posts: 436
Thanked 21 Times in 16 Posts
Default

Originally Posted by TriPinTaZ View Post
You can access the BCM using HPTuners. You might need to use the Beta version for the NPP controls (thats what I use). It does take 2 credits to license the BCM.

I've set my Track Mode to never close the NPP valves so now when I go to track mode it is just like pulling the fuse, always open 100% of the time. You can even tune Sport Mode to close the valves partially so that Sport mode is softer at low speeds and then queit at highway speeds. Then Tour mode is quiet always below 4500 RPM. And Track mode is god awful loud all of the time. Works great for my car because I have full headers and Borla exhaust.
That sounds awesome! Is the tuning of the NPP difficult (i.e something that an experienced HPT tuner needs to do)?
jimxms is offline  
Old 10-10-2018, 12:31 PM
  #16  
jimxms
CF Senior Member
Thread Starter
 
Member Since: Jul 2011
Posts: 436
Thanked 21 Times in 16 Posts
Default

Originally Posted by Wandering Scot View Post


You need these:

https://www.amazon.com/gp/aw/d/B00EQ...op_mb_pd_title

https://www.amazon.com/gp/aw/d/B00OZ...op_mb_pd_title

I donít have a schematic handy but I can draw one tonight.
The 2 black wires get joined to a larger ring terminal and go to ground.
The red fuse wire goes to the white remote wire.
You will need a small crimp spade terminal for the red remote wire.
That wire goes to the r/h lower fuse terminal.
The blue wire is antenna.
Take the fuse out of the NPP and put it into the upper fuse position.
Plug the assembly into the vacant NPP fuse.
You will need to make a small notch in the fuse cover for the wires to pass through.
Pair with the Homelink as directed in the owners manual.
The whole thing takes maybe 15 minutes.
Genius! Thanks man. This looks like a good interim fix until I can get it done via software!
jimxms is offline  
Old 10-10-2018, 03:59 PM
  #17  
Bill Dearborn
Tech Contributor
 
Bill Dearborn's Avatar
 
Member Since: Oct 1999
Location: Charlotte (formerly Endicott, NY) NC
Posts: 31,941
Thanked 2,813 Times in 1,933 Posts
Default

Originally Posted by jimxms View Post
I've heard people mention that they have managed to prevent the NPP valves from closing in tuning, but my tuner tells me that the NPP is controlled by the BCM not the ECM and therefore it cannot be modified as part of a normal tune.

How do I go about disabling NPP entirely for sport/track modes but leave it enabled for Eco? I have Diablosport, HPTuners and a Drewtech J2534 at my disposal.
Do you have an M7 or an A8. If you have an M7 just go to to the Settings menu on your center dash display and use the Engine Sound Management section to set the exhaust in Track Mode. That will leave the valves open all of the time except when the engine is running in V4 mode. Since that can only happen with an M7 when Eco is selected you get both closed and open valves in that mode depending on whether the engine is operating in V4 or V8 mode.

There is no need to pull a fuse or tune anything. It operates the same way with an A8 but the A8 switches from V8 to V4 and back in Tour and Sport modes.

The only time it doesn't switch is when the transmission is place in manual mode.

I have an M7 Z06 with the exhaust set in Track Mode all the time. I have wide open exhaust all of the time except in Eco Mode. The neat thing is when in Eco mode I know when the engine switches from V8 to V4 to V8. Loud exhaust in V8 mode and quiet exhaust in V4 mode. Even in cruise control at 45 mph in 5th gear with rpms somewhere around 1500 I can hear the exhaust switch as the ECM increases throttle as the car encounters a rise in the road and switches to V8 mode or once it is on level ground decreases throttle and switches back to V4 mode.

Bill
Bill Dearborn is offline  
Old 10-10-2018, 04:16 PM
  #18  
jimxms
CF Senior Member
Thread Starter
 
Member Since: Jul 2011
Posts: 436
Thanked 21 Times in 16 Posts
Default

Originally Posted by Bill Dearborn View Post
Do you have an M7 or an A8. If you have an M7 just go to to the Settings menu on your center dash display and use the Engine Sound Management section to set the exhaust in Track Mode. That will leave the valves open all of the time except when the engine is running in V4 mode. Since that can only happen with an M7 when Eco is selected you get both closed and open valves in that mode depending on whether the engine is operating in V4 or V8 mode.

There is no need to pull a fuse or tune anything. It operates the same way with an A8 but the A8 switches from V8 to V4 and back in Tour and Sport modes.

The only time it doesn't switch is when the transmission is place in manual mode.

I have an M7 Z06 with the exhaust set in Track Mode all the time. I have wide open exhaust all of the time except in Eco Mode. The neat thing is when in Eco mode I know when the engine switches from V8 to V4 to V8. Loud exhaust in V8 mode and quiet exhaust in V4 mode. Even in cruise control at 45 mph in 5th gear with rpms somewhere around 1500 I can hear the exhaust switch as the ECM increases throttle as the car encounters a rise in the road and switches to V8 mode or once it is on level ground decreases throttle and switches back to V4 mode.

Bill
I've got an M7, but I don't think I have that option in the Engine Sound Management. I'm pretty sure its either Auto or Disabled. I tried it both ways and neither had the desired effect. What year do you have? Mine is a '14.
jimxms is offline  
Old 10-10-2018, 04:39 PM
  #19  
Bill Dearborn
Tech Contributor
 
Bill Dearborn's Avatar
 
Member Since: Oct 1999
Location: Charlotte (formerly Endicott, NY) NC
Posts: 31,941
Thanked 2,813 Times in 1,933 Posts
Default

Originally Posted by jimxms View Post
I've got an M7, but I don't think I have that option in the Engine Sound Management. I'm pretty sure its either Auto or Disabled. I tried it both ways and neither had the desired effect. What year do you have? Mine is a '14.
I have a 15. The 15 owner's manual reads the same as the 14 manual. From Page 5-42 of the 14 OM:
"Engine Sound Management
This allows the Engine Sound
Management feature to be turned
on or off.
Select Auto (Mode Selector) or Off."

However, I get a selection when I enter engine sound management. The 15 manual could have a misprint in it due to carrying over 14 verbage or maybe they are both wrong. If you look at Engine Sound Management on the screen and only see a selection for Auto or Off I would select Off and see what happens.

This is what shows up in subsequent OM's:
"Engine Sound Management
This allows the Engine Sound
Management feature to be set
independent of the Driver Mode
Selector. See Track Events and
Competitive Driving 0 157.
Select Auto (Mode Selector) or
Stealth, Tour, Sport, or Track."

Bill
Bill Dearborn is offline  
Old 10-11-2018, 09:50 AM
  #20  
djyankees31
CF Member
 
Member Since: Feb 2017
Location: GA/SC/NC
Posts: 86
Thanked 8 Times in 5 Posts
Default

I have a 15 A8 with the settings as described by Bill.

It works great.
djyankees31 is offline  

Thread Tools
Search this Thread
Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: