Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
Cam Motion
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Engine | Drivetrain | Powertrain Technical Discussions > Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons

Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

Reply
 
Thread Tools
Old 02-10-2011, 04:09 PM   #1
robertway

 
robertway's Avatar
 
Drives: 2012 Challenger SRT8 Auto
Join Date: Sep 2009
Location: Central New Jersey
Posts: 842
NOWEEDS Exhaust Diverters on LS3 with LTs (idle/rev/drive-by/dyno video)

Installed my NOWEEDS Exhaust Diverters last week after having installed a cam the week before. I am running Kooks 1 7/8" headers with their Hi-Flow Cats and they hook up to the stock mid-pipes and garbage cans, I mean mufflers . Last week when I got the car tuned we forgot to do a back-to-back with the diverters closed and then open so I had to wait until the shop could get me back in this week to do the pulls.

Steve at NOWEEDS.net was great to work with, he went out of his way to get my diverters in the next production batch so I didn't have to wait too long to finish my car after having done the cam and waiting on the diverters before going for a tune. When I received the diverters they were very well packaged and came complete with everything necessary to install including detailed instructions which are also available on their web site.

The install went very smooth and only took a couple of hours taking my time. I am not going to go into a DIY with pictures as member "CanadianCamaro" already did a very thorough DIY some time ago which I used along with the instructions from Steve at NOWEEDS.

I did run into one issue after install in that after a day's worth of driving and heat cycles into the diverters, the passenger-side unit would no longer close all the way and it's butterfly valve was falling short of full close by about 1/16" which doesn't seem like much but it something you can hear. I immediately reached out to Steve and within a short time had a response back that mentioned there is a possibility after the first few long heat cycles that the actuator may have to be adjusted slightly but this has only happened on rare occasions and he clearly outlined the procedure for adjusting the throw on the actuator which only took about 10 minutes from wheels up to wheels down in the garage. After the adjustment everything has been fine.

As for the pulls on the dyno, I got back into East Coast Supercharging who got me squeezed back in for a handful of pulls despite their hectic workload (and me pestering them for most of the week) to get the closed/open comparison and try to help put to rest whether they help at all. Getting in first thing in the morning, Matt at ECS had to get a few pulls in on their DynaPak dyno to get it warmed up a bit and there was already good temp in the car from the drive to the shop. After the warm-up pulls he did back to back pulls, first pull with the diverters closed, let the car settle back into idle for 15 seconds, open the diverters, and then pull again. The car gained 9RWTQ and 10RWHP with the diverters open and that was on the second pull of an immediate back to back. The gain really showed itself above 5000 rpm and all the way until the end of the pull. If we wanted to play dyno games we could have let the car cool off for 5-10 minutes and maybe seen a 15-20RWHP increase based on speculation but I think the back to back says a lot as numbers tend to drop off a bit on immediate back to back pulls, not increase so it is obvious the stock cans are choking the LS3 just a bit. Overall the car pulled a little less than it did the week before when it was tuned for the cam but "different day, different numbers" as the story goes, still kicking myself for not getting the open diverter pull done the same day the car was tuned to get some nice before/after cam and closed/open diverter graphs.

Here is a video with footage of idle, rev, in-cabin cruise, in-cabin acceleration, roadside fly-by, and dyno pulls all with the diverter closed/open comparisons. Video just does not do the sound justice. When the diverters were open on the dyno it was shaking the garage and you could feel the sound waves pounding you in the chest, and I was standing outside the door of the dyno room with the camera. TURN THOSE SPEAKERS UP!!!



For any haters out there that think the pulls weren't actually back-to-back with VERY little time between here is the unedited video as I had to split the above to get the different titles at the bottom of the screen. Back-to-back pulls, 15 seconds between, +9RWTQ and +10RWHP with dyno sheet.





The diverters really give me the best of both worlds in that I save my marriage by keeping the relatively quiet setup with the stock mufflers but also have the ability to scare children and rattle dentures when I want to. Looking forward to getting video of this thing hauling down the front straight at Pocono Raceway this coming summer . Does it really matter that I gained 10RWHP, probably not as I would be hard pressed to feel it but I am just wondering how much more the car may pick up closed-to-open when the ECS Paxton Centri blower is on it as it is obvious the stock mid-pipes and cans are a bit restrictive.

Once again I have to thank Steve at NOWEEDS for his help both before and after the sale and as always Doug, Chris, Mike, and Matt at East Coast Supercharging for accommodating me and fitting in my "do over" pulls amidst their workload.
__________________

"When the people find they can vote themselves money, that will herald the end of the republic." - Benjamin Franklin




LS3 Camshaft Swap Do-It-Yourself Instructions - 2010 LS3 gone but not forgotten!!!
robertway is offline   Reply With Quote
Old 02-10-2011, 04:19 PM   #2
mikeSS


 
mikeSS's Avatar
 
Drives: 2013 E92 M3
Join Date: Nov 2009
Location: MI
Posts: 7,335
i kind of want to get this. i have kooks with cats . but i am worried i might have problems hooking them up to my corsa cat back..? idk if it will be worth it if i already have a corsa. does anybody know how much louder it will be then corsa?

other then that you did a very good job with the video and review. thanks !!!
__________________

2010 camaro cammed- sold
2013 E92 V8 M3 DCT ZCP
C7 pending order
mikeSS is offline   Reply With Quote
Old 02-10-2011, 04:24 PM   #3
BigMatt
2010 Camaro 2 SS/RS M6
 
BigMatt's Avatar
 
Drives: 2010 Camaro SS/RS
Join Date: May 2009
Location: Landenberg, Pa
Posts: 1,095
Send a message via AIM to BigMatt
sounds awesome!!
__________________
LS3, JRE Smooth Idle cam, CAI Inc, ARH 1 7/8, Corsa, MSD Wires, MGW Shifter, Street slayer clutch, Tick braided clutch line & speed bleeder, DSS 1000hp ds & 1400hp axles, BMR Split drop, Sway Bars, Trailing Arms, Toe Rods, Pro bushing kit, Spohn lcas, Whipple, LPE dual fuel pumps, Rx catch can, Id850s, Powerhaus Performance tuned.
BigMatt is offline   Reply With Quote
Old 02-10-2011, 05:49 PM   #4
robertway

 
robertway's Avatar
 
Drives: 2012 Challenger SRT8 Auto
Join Date: Sep 2009
Location: Central New Jersey
Posts: 842
Quote:
Originally Posted by mikeSS View Post
i kind of want to get this. i have kooks with cats . but i am worried i might have problems hooking them up to my corsa cat back..? idk if it will be worth it if i already have a corsa. does anybody know how much louder it will be then corsa?

other then that you did a very good job with the video and review. thanks !!!
Looking at the full Corsa cat-back, it doesn't look like the NOWEEDS will easily mate up with the mid-pipes. You would have to cut some of the mid-pipes off at the front but doubt they would line up correctly. NOWEEDS also makes a diverter that fits a full American Racing Headers setup as it gets inserted into a straight section of pipe. I would reach out to Steve at NOWEEDS if you are really interested, let him know what you have and he can let you know if there is a way to make it work. I know he has helped one other member with a full Kooks exhaust setup using the ARH version of the diverter.

As for "how much louder", I have never heard Corsa in person, if I had already done a cat-back I wouldn't have done these though as they cost almsot as much as some of the full cat back setups.
__________________

"When the people find they can vote themselves money, that will herald the end of the republic." - Benjamin Franklin




LS3 Camshaft Swap Do-It-Yourself Instructions - 2010 LS3 gone but not forgotten!!!
robertway is offline   Reply With Quote
Old 02-10-2011, 06:58 PM   #5
mikeSS


 
mikeSS's Avatar
 
Drives: 2013 E92 M3
Join Date: Nov 2009
Location: MI
Posts: 7,335
Quote:
Originally Posted by robertway View Post
Looking at the full Corsa cat-back, it doesn't look like the NOWEEDS will easily mate up with the mid-pipes. You would have to cut some of the mid-pipes off at the front but doubt they would line up correctly. NOWEEDS also makes a diverter that fits a full American Racing Headers setup as it gets inserted into a straight section of pipe. I would reach out to Steve at NOWEEDS if you are really interested, let him know what you have and he can let you know if there is a way to make it work. I know he has helped one other member with a full Kooks exhaust setup using the ARH version of the diverter.

As for "how much louder", I have never heard Corsa in person, if I had already done a cat-back I wouldn't have done these though as they cost almsot as much as some of the full cat back setups.
ya thats what i was thinking. if i still had stock mufflers i would for sure get them. well thanks anyways
__________________

2010 camaro cammed- sold
2013 E92 V8 M3 DCT ZCP
C7 pending order
mikeSS is offline   Reply With Quote
Old 02-10-2011, 07:58 PM   #6
10aSSee D

 
10aSSee D's Avatar
 
Drives: Silver 2010 SS Camaro
Join Date: Jul 2009
Location: TN
Posts: 1,977
Best of both worlds is what I say... sounds great man.
__________________
MODS:

ADM built 417, 2.9L Whipple with 3.250 pulley, ADM ported and polished LSA heads,ADM stage3 cam,ADM LSA belt drive system,ADM CAI race scoop, ADM dual fuel pumps, ID 850's, BMR full suspension, Gforce 9 inch kit with 3.5 inch driveshaft, Street Slayer twin carbon clutch, Lingenfelter oil seperator. Tuned by built by ADM Performance, 740rwhp,685rwtq
10aSSee D is offline   Reply With Quote
Old 02-10-2011, 08:59 PM   #7
Jay_LHD3

 
Jay_LHD3's Avatar
 
Drives: CGM 2SS/RS LS3
Join Date: Aug 2009
Location: SW Georgia
Posts: 1,978
Lol. I was just on youtube and did a camaro search for the last 24 hrs. I found your video and instantly recongized your car due to your wheels and garage! I remember when you got your wheels and you posted pics of them in your garage side by side with your stock wheels.

Sounds and looks great!!
__________________
Jay_LHD3 is offline   Reply With Quote
Old 02-11-2011, 05:29 PM   #8
now
 
Drives: silverado ss
Join Date: Aug 2008
Location: fairfax sd
Posts: 112
Robert,

Thanks a ton for all your effort with these videos- Sound is so hard to capture accurately without camera's automatic gain control 'flattening' everything out. This is the best i have seen to date.

Beautiful job on the editing too.

One thing that i have yet to capture on film is the lack of exhaust at the tail pipes with diverters open- the scene in the garage with the cold temps shows this perfectly.

Thanks again!

Wicked Camaro...


steve
now is offline   Reply With Quote
Old 02-11-2011, 05:52 PM   #9
Jcobra

 
Jcobra's Avatar
 
Drives: 2010 2ss/rs M6
Join Date: Nov 2010
Location: Il
Posts: 926
How much are those things?
Jcobra is offline   Reply With Quote
Old 02-11-2011, 05:55 PM   #10
Jcobra

 
Jcobra's Avatar
 
Drives: 2010 2ss/rs M6
Join Date: Nov 2010
Location: Il
Posts: 926
Nevermind I found their site.
Jcobra is offline   Reply With Quote
Old 02-11-2011, 07:00 PM   #11
Alain

 
Alain's Avatar
 
Drives: 2010 SS, RS, Manual. 2012 F150, FX4
Join Date: Dec 2009
Location: Northern NJ
Posts: 1,567
car sounds nice man. you did an awesome job with the videos.
Alain is offline   Reply With Quote
Old 02-11-2011, 07:07 PM   #12
robertway

 
robertway's Avatar
 
Drives: 2012 Challenger SRT8 Auto
Join Date: Sep 2009
Location: Central New Jersey
Posts: 842
Thanks for the compliments folks....

Quote:
Originally Posted by noweeds.net View Post
Robert,

Thanks a ton for all your effort with these videos- Sound is so hard to capture accurately without camera's automatic gain control 'flattening' everything out. This is the best i have seen to date.

Beautiful job on the editing too.

One thing that i have yet to capture on film is the lack of exhaust at the tail pipes with diverters open- the scene in the garage with the cold temps shows this perfectly.

Thanks again!

Wicked Camaro...


steve
Steve, thanks very much for posting. The diverters are great, they wreaked of quality as soon as I opened the box. I showed my father (an old MOPAR man from the 60's) and he thought they were awesome. He remembered the days he used to do cutouts with a cable and lever to activate them, he then told me how we walked to school both ways up hill barefoot in the snow. As soon as I opened them you could see the big smile on his face . Now I just have to get the car to the strip so he can hear them run wide open.

Thanks again for all your help throughout the process.
__________________

"When the people find they can vote themselves money, that will herald the end of the republic." - Benjamin Franklin




LS3 Camshaft Swap Do-It-Yourself Instructions - 2010 LS3 gone but not forgotten!!!
robertway is offline   Reply With Quote
Old 04-03-2011, 03:14 PM   #13
Darth_Emma
Psssssssssshhhhhhhhhhhhh!
 
Darth_Emma's Avatar
 
Drives: under contruction
Join Date: Nov 2009
Location: Marysville, Ohio
Posts: 13,151
Thanks for posting those videos. I've been thinking about doing exhaust cutouts and I've now seen enough vids that I think I'll like them.

My shop (IPS Motorsports) likes to install the QTP electric cutouts, so I'm going with that set up.
__________________
Darth_Emma is offline   Reply With Quote
Old 04-04-2011, 12:09 AM   #14
1up5dn
 
1up5dn's Avatar
 
Drives: 2011 Black RS SS
Join Date: Aug 2010
Location: Chandler, AZ
Posts: 137
Wow, that simply sounds awesome! I have Kooks LT's and Corsa cat back, but am still thinking I would like to add something like this. You can't beat that sound, especially with the cam in there.



Chris....
1up5dn is offline   Reply With Quote
Old 04-04-2011, 08:46 AM   #15
lock

 
lock's Avatar
 
Drives: 11 2SS/RS E-Force Supercharged
Join Date: Apr 2010
Location: Charlotte
Posts: 814
Nice car man. Clean and sounds killer.
__________________
11 IOM 2SS/RS E-Force Supercharged. 616 RWHP/578 RWTQ. Click link for my journal!!!


lock is offline   Reply With Quote
Old 12-17-2011, 07:04 PM   #16
khislop007
ZEUSS
 
khislop007's Avatar
 
Drives: Hard!
Join Date: Sep 2008
Location: Cayman Islands
Posts: 2,576
Man do they sound awesome. Its sounds like going from 426HP to +1000HP with the flick of a switch. I think I'm going to order these after christmas.

Thanks for posting.
__________________
khislop007 is offline   Reply With Quote
Old 12-18-2011, 08:42 AM   #17
AngelSpeedFreak
Most hated in NM....
 
AngelSpeedFreak's Avatar
 
Drives: Boosted, Cammed, Bagged, Dipped...
Join Date: Sep 2011
Location: New Mexico
Posts: 2,872
Quote:
Originally Posted by khislop007 View Post
Man do they sound awesome. Its sounds like going from 426HP to +1000HP with the flick of a switch. I think I'm going to order these after christmas.

Thanks for posting.
That is exactly what it sounds like to be honest.
__________________
AngelSpeedFreak is offline   Reply With Quote
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:54 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.