Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
TireRack
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Technical Camaro Topics > Dragstrip and Launch Techniques Discussion


Reply
 
Thread Tools
Old 07-15-2012, 10:13 PM   #1
linehand7
 
Drives: 03 duramax 01impala 2010 2ssrs
Join Date: Feb 2009
Location: lead sd
Posts: 140
unhook the exhaust?

In the old days, we used to drop the exhaust and run open headers, bump up the timing, and put high octane fuel in the car and head for the strip... Today we are already running the high octane and the computer takes care of the timing and the air fuel ratio, so .... can you unhook the exhaust from the axle back and gain some power while at the track? Or will the computer go nuts? (need to drop 2/10ths to be happy) car is stock except for tvs 2300 with magnusons tune. 2ssrs on dr turning 12.2 at 1700'
linehand7 is offline   Reply With Quote
Old 07-15-2012, 10:21 PM   #2
John Deere Racer

 
John Deere Racer's Avatar
 
Drives: 2013 zl1 m6
Join Date: Jul 2011
Location: Williamsport,IN
Posts: 915
I'd say ur tune will b off

Especially Sence u have a blower
__________________
2013 ZL1 M6 black on black 10 spokes

592rwhp 616rwtq bolt ons only
www.mikenorrismotorsports.com
Www.lgmotorsports.com
John Deere Racer is offline   Reply With Quote
Old 07-15-2012, 10:25 PM   #3
Denis


 
Denis's Avatar
 
Drives: 2010 SS
Join Date: May 2012
Location: Lexington Park, MD
Posts: 7,625
i dont see why it would be an issue. i mean what would be the difference between removing the exhaust and using cut-outs?
__________________
Denis is offline   Reply With Quote
Old 07-16-2012, 10:42 AM   #4
Pro Stock John
Writer
 
Pro Stock John's Avatar
 
Drives: 2010 SS / 1951 Mercury
Join Date: May 2009
Location: Chicago, IL
Posts: 6,333
Sure you could take the entire axleback off and just run straight pipes. I think it would only run a hair leaner nothing that would concern me personally.
__________________
PROJECT HEAVY CHEVY
Camaro Now: Mods for the Masses Part I | Part II
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune
12.06@113 1.70 | + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune
11.84@115 1.59 | + 3.91s + Race Star 17x7 Fronts
10.90@125 1.47 | + GPI VVT Cam + BW Ported Heads + CD 3800
Pro Stock John is offline   Reply With Quote
Old 07-16-2012, 12:32 PM   #5
Denis


 
Denis's Avatar
 
Drives: 2010 SS
Join Date: May 2012
Location: Lexington Park, MD
Posts: 7,625
Quote:
Originally Posted by Pro Stock John View Post
Sure you could take the entire axleback off and just run straight pipes. I think it would only run a hair leaner nothing that would concern me personally.
i think he means removing the entire cat-back assembly and just running open headers
__________________
Denis is offline   Reply With Quote
Old 07-16-2012, 01:00 PM   #6
Bad70supreme


 
Bad70supreme's Avatar
 
Drives: 2010 aqua blue SS/RS M6
Join Date: Feb 2010
Location: plainfield, IL
Posts: 2,696
It's worth a shot, remove the hole catback and install a 12 inch pipe off the headers. Most engines like a short piece of pipe off the colector for most power, without it you can actually loose power. removing the catback will remove wieght as well and not hard to do. Good luck, my olds ran the fastest with a X pipe off the headers and dumped before the rear without mufflers.
__________________
11.37@120 H/C stock block N/A
On the quest for 10s N/A
Bad70supreme is offline   Reply With Quote
Old 07-16-2012, 07:07 PM   #7
linehand7
 
Drives: 03 duramax 01impala 2010 2ssrs
Join Date: Feb 2009
Location: lead sd
Posts: 140
thanks guys... thought i would have more responces by now, looks like we have some of the young "know it alls" stumped. I spoke to magnuson and they said there tune was good for cai and aftermarket exhaust, any more mods and they recomend a professional tune, this is why i wanted to drop the axle back. I understand the tune wont be perfect, but i was hoping for a few hp. I dont have headers just wanted to drop the axle back, (hoping to reduce enough back pressure-like an aftermarket exhaust system) I agree with PROSTOCKJOHN ... just wondering if it would throw a cel. and DENIS... do the exhaust cutouts throw a cel?... completely taking the axle-back cant hurt for weight either, has anyone else tried these things? my next trip to the track won't be untill Labor Day weekend, but I'll be there for 4 days some of it will be test-n-tune... I think I'll give it a try.
linehand7 is offline   Reply With Quote
Old 07-16-2012, 07:13 PM   #8
HufferSS
I Wanna Go Faster!!
 
HufferSS's Avatar
 
Drives: 2011 2SS Synergy Green M6
Join Date: Apr 2011
Location: SC
Posts: 3,328
You will gain nothing.

It will sound cool though.
__________________
Built by Vengeance Racing
9.31@154.81 mph
Procharger F1-X
RPM Level 7 4L80e + Coan Converter
Hendrix 9" Rear Axle + 3.50 Gear
ARH 2" LTs+3.5" Exhaust
Fore Fuel System, Bogarts + Hoosier Slicks
Pfadt Drag Pack Suspension
My Build Thread | Best Pass To Date
HufferSS is offline   Reply With Quote
Old 07-16-2012, 07:15 PM   #9
linehand7
 
Drives: 03 duramax 01impala 2010 2ssrs
Join Date: Feb 2009
Location: lead sd
Posts: 140
bad70supreme... good advise, thankyou, I'm also doing a Nova for the wife ( her dream hot rod) and was planning on doing that exact same thing. would you recommend 3inch pipe... It will be a small block chevy with a blower, If I have one she's gotta have one... You know howthat goes...lol
linehand7 is offline   Reply With Quote
Old 07-16-2012, 07:33 PM   #10
linehand7
 
Drives: 03 duramax 01impala 2010 2ssrs
Join Date: Feb 2009
Location: lead sd
Posts: 140
My daughter has been running my extended cab duramax (with a Predator Programmer) at a 14.7 at 95 mph... She wants to make the 100mph club (you get a sticker for your car) I thought if i drained the auxillary fuel tank (30 gallons of fuel in it) and removed it, took out the fifth wheel hitch, removed the tonue cover, the spare tire, the reciever hitch and the tailgate I would lose close to 600 pounds, and if i dropped the exhaust from the cat back (and put on a tuner pipe) and prayed for a south wind ... she would probably make it...LOL Any other tips for a duramax 4x4 would be appreciated... thankyou CAMARO5 this is THE BEST FORUM for all chevys. Even the vette guys think so... even if they don't admitt it.
linehand7 is offline   Reply With Quote
Old 07-16-2012, 07:44 PM   #11
linehand7
 
Drives: 03 duramax 01impala 2010 2ssrs
Join Date: Feb 2009
Location: lead sd
Posts: 140
hufferss... any reason why? will i lose boost? is it because its not tuned for it? please elaborate...
linehand7 is offline   Reply With Quote
Old 07-16-2012, 08:01 PM   #12
Pro Stock John
Writer
 
Pro Stock John's Avatar
 
Drives: 2010 SS / 1951 Mercury
Join Date: May 2009
Location: Chicago, IL
Posts: 6,333
Won't run slower. Usually blowers like less restriction. So do nitrous and turbos too.

Sent from my PC36100 using Tapatalk 2
__________________
PROJECT HEAVY CHEVY
Camaro Now: Mods for the Masses Part I | Part II
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune
12.06@113 1.70 | + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune
11.84@115 1.59 | + 3.91s + Race Star 17x7 Fronts
10.90@125 1.47 | + GPI VVT Cam + BW Ported Heads + CD 3800
Pro Stock John is offline   Reply With Quote
Old 07-17-2012, 10:27 AM   #13
HufferSS
I Wanna Go Faster!!
 
HufferSS's Avatar
 
Drives: 2011 2SS Synergy Green M6
Join Date: Apr 2011
Location: SC
Posts: 3,328
Quote:
Originally Posted by linehand7 View Post
hufferss... any reason why? will i lose boost? is it because its not tuned for it? please elaborate...
No...the factory exhaust just isn't a restriction past the headers and cats.
__________________
Built by Vengeance Racing
9.31@154.81 mph
Procharger F1-X
RPM Level 7 4L80e + Coan Converter
Hendrix 9" Rear Axle + 3.50 Gear
ARH 2" LTs+3.5" Exhaust
Fore Fuel System, Bogarts + Hoosier Slicks
Pfadt Drag Pack Suspension
My Build Thread | Best Pass To Date
HufferSS is offline   Reply With Quote
Old 07-18-2012, 11:03 AM   #14
dkg11
 
dkg11's Avatar
 
Drives: 2010 Camaro 2SS
Join Date: Apr 2012
Location: Cleveland Ohio
Posts: 387
I have QTP cut-outs and i have yet to dyno my car to see the difference...but i think the only power gain you get from cutouts is you sound louder
__________________
2010 Camaro 2SS/LS3
Magna Flow Street series Exhaust
Airaid Intake+throttle body
Custom tune by Bob Morreale www.thetuningschool.com
QTP Electronic Exhaust cut-outs
12'' Alpine type R with 1500watts double ported box
Tinted windows
392RWHP on Mustang Dyno
#13933
dkg11 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 02:59 AM.


Powered by vBulletin® Version 3.8.9 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.