Larger Cam & NPP Compatibility? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

booneSS13 · 06-05-2016, 12:13 AM

Every since my eengine install I have not been able to getmy NPP exhaust to function. I took it to the dealership and they claim it's because of less vacuum with this cam, which would make sense seeing as that it's vacuum activated. I've just never heard of anyone else having this issue and was curious to know if anyone else has.

My dual mode system was factory installed and I also have a Mild to Wild switch.

Eric14SS · 06-05-2016, 01:42 AM

My npp exhaust is works just fine after my cam swap. Check to see if the vacuum line behind the intake manifold is connected.

booneSS13 · 06-05-2016, 02:14 AM

Quote:

Originally Posted by Eric14SS

My npp exhaust is works just fine after my cam swap. Check to see if the vacuum line behind the intake manifold is connected.

I actually pulled the intake off and made sure it was connected and it was connected fine. I sprayed around the intake manifold with carb cleaner for leaks and couldn't find anything. I almost wonder if my o2 sensor is affecting it since it's been running kind of rough when it's cold at part throttle. I have a code for it. I'll be changing that in a couple days.

christianchevell · 06-05-2016, 09:03 AM

I am on my second cammed engine with NPP no problems, check behind the passenger side panel in the trunk look at the fuse box there and see if its trashed by short, that's where you would pull a fuse to make it always open or hook up a switch like the Forza three way, also look at the hoses to the cans in back etc....one may have come loose, theres a good set of directions for installing the Forza threeway switch that can show you the parts of the system. Good Luck. And BTW I love my Forza switch , the threeway works much better than the mild to wild switches of which I was on my second the first failed in one year.......and I wanted to turn the exhaust on when needed in the morning or to be polite by cops...... In other words mild to wild POS..... most likely your problem......Forza threeway worth it...responds quicker, I keep mine on constantly and turn the exhaust on before driving in the morning and any minor drain is nothing to worry about.... the Three way is built and more of a pain to install, but worth it.....

Unreal · 06-05-2016, 10:19 AM

If the cam is so large that you don't have enough vacuum, then NPP and power assist on brakes will be effected.

Gearheaded · 06-05-2016, 12:37 PM

Npp works fine on my cam swapped LS3 as well. Though, I don't use it lol!

Unreal · 06-05-2016, 12:53 PM

All these people saying "works fine and I have a cam", you realize there is HUGE differences between cams.

A 220/230 won't have anywhere near the vacuum of a 240/250 cam. So without specs, idle speed, etc, saying yours works with a cam is kind of pointless. What vacuum do you have at idle is what he needs to know.

JusticePete · 06-05-2016, 01:48 PM

Quote:

Originally Posted by Unreal

All these people saying "works fine and I have a cam", you realize there is HUGE differences between cams.

A 220/230 won't have anywhere near the vacuum of a 240/250 cam. So without specs, idle speed, etc, saying yours works with a cam is kind of pointless. What vacuum do you have at idle is what he needs to know.

booneSS13 · 06-05-2016, 02:08 PM

My cam is a 235/242 btw. And I had no idea that mild 2 wild is problematic like that. What I think I'm going to do today is put the fuse back in just like it was stock and see if it works to isolate whether it's my M2w switch or not.

Gearheaded · 06-05-2016, 04:06 PM

But what cam is the OP running? Mine is 235/239, so it's no slouch

*mlee* · 06-05-2016, 04:15 PM

Just pull the fuse and don't worry about it.

dentnshell · 06-05-2016, 04:40 PM

GPI ss1, running NPP (not factory)
Everything works just like it did before the cam swap

booneSS13 · 06-05-2016, 05:33 PM

Okay so I disconnected the M2w and put the factory fuse back in, took it for a drive and the dual mode worked perfectly fine! Christianchevelle was right the M2w didn't hold up

Now to do the old fashioned fuse pull

06-05-2016, 12:13 AM	#1
booneSS13 Drives: 2013 Camaro SS LS3 Join Date: Jun 2015 Location: Davenport IA Posts: 718	Larger Cam & NPP Compatibility? Every since my eengine install I have not been able to getmy NPP exhaust to function. I took it to the dealership and they claim it's because of less vacuum with this cam, which would make sense seeing as that it's vacuum activated. I've just never heard of anyone else having this issue and was curious to know if anyone else has. My dual mode system was factory installed and I also have a Mild to Wild switch. __________________ *Romans 5:8* But God demonstrates his own love for us in this: While we were still sinners, Christ died for us. -Fastlane Cold Air Intake, NPP cat back exhaust, Stainless Works LT Headers, 2r max camshaft, Stage 3 Ported Heads (Manley Stainless steel values, titanium retainers, dual valve springs, bronze guides), Wiseco Forged Pistons, K1 Forged Rods, Clevite Bearings, Factory Crankshaft, Comp Cams rocker arm trunion kit, Morel 5315 lifters, JP performance single billet timing chain, Melling oil pump, Spec stage 3+ clutch and flywheel, BMR trailing arms, Nitto 555r 305/35/20.

06-05-2016, 09:03 AM	#4
christianchevell old school chevy rodder Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012 Location: Oregon Posts: 5,587 View My Garage	I am on my second cammed engine with NPP no problems, check behind the passenger side panel in the trunk look at the fuse box there and see if its trashed by short, that's where you would pull a fuse to make it always open or hook up a switch like the Forza three way, also look at the hoses to the cans in back etc....one may have come loose, theres a good set of directions for installing the Forza threeway switch that can show you the parts of the system. Good Luck. And BTW I love my Forza switch , the threeway works much better than the mild to wild switches of which I was on my second the first failed in one year.......and I wanted to turn the exhaust on when needed in the morning or to be polite by cops...... In other words mild to wild POS..... most likely your problem......Forza threeway worth it...responds quicker, I keep mine on constantly and turn the exhaust on before driving in the morning and any minor drain is nothing to worry about.... the Three way is built and more of a pain to install, but worth it..... __________________ 2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop

06-05-2016, 10:19 AM	#5
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	If the cam is so large that you don't have enough vacuum, then NPP and power assist on brakes will be effected. __________________ Nick Corvette Z06 -1200ish rwhp

06-05-2016, 12:37 PM	#6
Gearheaded Drives: 2014 SS Join Date: Apr 2015 Location: Florida Posts: 369	Npp works fine on my cam swapped LS3 as well. Though, I don't use it lol! __________________ Toys: 2014 SS - TSP 235/239, CAI, LT's, 12.2 @ 115 ("SLOWLY" chipping away ET) 2000 Trans Am - Bolt-ons 13.0@110 (sold) 2009 YZF R1 - Race bike (road course)(totaled racing) 2008 YZF R6 - Race bike (road course)(still own)

06-05-2016, 12:53 PM	#7
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	All these people saying "works fine and I have a cam", you realize there is HUGE differences between cams. A 220/230 won't have anywhere near the vacuum of a 240/250 cam. So without specs, idle speed, etc, saying yours works with a cam is kind of pointless. What vacuum do you have at idle is what he needs to know. __________________ Nick Corvette Z06 -1200ish rwhp

06-05-2016, 01:42 AM	#2
Eric14SS Drives: 14 2SS RS and 16 Silverado LTZ Z71 Join Date: May 2014 Location: New Lenox, IL Posts: 68	My npp exhaust is works just fine after my cam swap. Check to see if the vacuum line behind the intake manifold is connected.

06-05-2016, 02:08 PM	#9
booneSS13 Drives: 2013 Camaro SS LS3 Join Date: Jun 2015 Location: Davenport IA Posts: 718	My cam is a 235/242 btw. And I had no idea that mild 2 wild is problematic like that. What I think I'm going to do today is put the fuse back in just like it was stock and see if it works to isolate whether it's my M2w switch or not. __________________ *Romans 5:8* But God demonstrates his own love for us in this: While we were still sinners, Christ died for us. -Fastlane Cold Air Intake, NPP cat back exhaust, Stainless Works LT Headers, 2r max camshaft, Stage 3 Ported Heads (Manley Stainless steel values, titanium retainers, dual valve springs, bronze guides), Wiseco Forged Pistons, K1 Forged Rods, Clevite Bearings, Factory Crankshaft, Comp Cams rocker arm trunion kit, Morel 5315 lifters, JP performance single billet timing chain, Melling oil pump, Spec stage 3+ clutch and flywheel, BMR trailing arms, Nitto 555r 305/35/20.

06-05-2016, 04:06 PM	#10
Gearheaded Drives: 2014 SS Join Date: Apr 2015 Location: Florida Posts: 369	But what cam is the OP running? Mine is 235/239, so it's no slouch __________________ Toys: 2014 SS - TSP 235/239, CAI, LT's, 12.2 @ 115 ("SLOWLY" chipping away ET) 2000 Trans Am - Bolt-ons 13.0@110 (sold) 2009 YZF R1 - Race bike (road course)(totaled racing) 2008 YZF R6 - Race bike (road course)(still own)

06-05-2016, 04:15 PM	#11
mlee CamaroFans.com Drives: ZLE & ZR2 Join Date: Oct 2008 Location: Conroe, TX Posts: 37,507 View My Garage	Just pull the fuse and don't worry about it. __________________

06-05-2016, 04:40 PM	#12
dentnshell Drives: Black 2014 2SS Join Date: Apr 2015 Location: Oologah, OK Posts: 454 View My Garage	GPI ss1, running NPP (not factory) Everything works just like it did before the cam swap __________________ 2014 L99 2SS. 595HP/571ft-lbs Mods: LSA Conversion 2.5" Upper Pulley, 65# injectors, GPI SS1 Cam, SP Long Tubes, ADM Race Scoop & CAI, NPP exhaust (DIY control), BMR 1" lowering springs, ZL1 Rear Differential / Axles, CF Side Strip / Hood Spear, Tint - Windows / Tails / Sidemarkers, Splash Guards, ADM Boost Gauge, ABL Dashkit, '68 Script Badges, ACS T4 Splitter, ZL1 Rockers from Gary's, Z28 Spoiler, Carbon Fiber Hood Vent, Summer - MRR FS01 Satin Black (10" Front 11" Rear) Winter, pictured-Drag DR 64's Satin Black (9" Front-10" Rear.)

06-05-2016, 05:33 PM	#13
booneSS13 Drives: 2013 Camaro SS LS3 Join Date: Jun 2015 Location: Davenport IA Posts: 718	Okay so I disconnected the M2w and put the factory fuse back in, took it for a drive and the dual mode worked perfectly fine! Christianchevelle was right the M2w didn't hold up Now to do the old fashioned fuse pull __________________ *Romans 5:8* But God demonstrates his own love for us in this: While we were still sinners, Christ died for us. -Fastlane Cold Air Intake, NPP cat back exhaust, Stainless Works LT Headers, 2r max camshaft, Stage 3 Ported Heads (Manley Stainless steel values, titanium retainers, dual valve springs, bronze guides), Wiseco Forged Pistons, K1 Forged Rods, Clevite Bearings, Factory Crankshaft, Comp Cams rocker arm trunion kit, Morel 5315 lifters, JP performance single billet timing chain, Melling oil pump, Spec stage 3+ clutch and flywheel, BMR trailing arms, Nitto 555r 305/35/20.