When is it worth it to remove the exhaust.
#991683
05/13/11 02:38 PM
05/13/11 02:38 PM
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Joined: Feb 2004
Posts: 964 Nanaimo, B.C.
GwaiiEagle
OP
Mannix
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OP
Mannix
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
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I drive to the track.
450 stroker, Aluminum heads, Performer RPM intake. 282S Comps Cam (528 lift w/ 1.6 rocker ratio), 850DP, 1 3/4 headers to a 3 inch collector and 3 inch 40 series flowmasters. 3.91 gear.
I run M/T Drags, 28x9x14
Would I see any real timeslip difference by taking the exhaust off at this power level.
Last edited by GwaiiEagle; 06/08/11 12:03 AM.
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Re: When is it worth it to remove the exhaust.
[Re: GwaiiEagle]
#991686
05/13/11 03:52 PM
05/13/11 03:52 PM
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Joined: Aug 2003
Posts: 43,719 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,719
Bend,OR USA
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Quote:
I drive to the track.450 stroker, Aluminum heads, Performer RPM intake. 282S Comps Cam (528 lift w/ 1.6 rocker ratio), 850DP, 1 3/4 headers to a 3 inch collector and 3 inch 30 series flowmasters. 3.91 gear.I run M/T Drags, 28x9x14Would I see any real timeslip difference by taking the exhaust off at this power level.
Try it and see I have had two cars that I have done at the track testing, one was a 1969 Dart GTS with a stock bore high compression 440 motor, 727 and a race nine inch BM converter, BB Hooker fenderwell headers into a 2.5 pipe with 2.5 inch turbo mufflers mounted as side pipes exiting in front of the rear tires, it picked up .9 ET(nine tengths) and 9 MPH by removing the mufflers and pipes in the 1/4 mile at LACR, CA I didn't believe it was posssible, I made a bunch of runs that day and it( the differences) was absolutely accurate My current street and strip car is a BB Duster( a second and a half faster than the Dart was, 10.30 at 128 MPH)) that has a BB 518 C.I. pump gas stroker motor with a 727, ten inch custom built converter and a 3 inch exhaust system with a set of 3x14 oval Mgnaflow muffs mounted at the rear bumper with the same Hooker fenderwell headers as on the Dart, I ran the car at the local 1/8 mile track, Madras, OR and that car picked up .03 ET and .2 MPH by removing the complete exhaust system at the track, not worth doing in my opinion)probally the weight was the differences) My message is to try it and see, maybe it will pick up a bunch and maybe it won't. The mufflers will be the key Let us know your results
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: When is it worth it to remove the exhaust.
[Re: Cab_Burge]
#991687
05/13/11 04:01 PM
05/13/11 04:01 PM
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Joined: Jan 2003
Posts: 1,142 Central New York
slippery440
Crybaby440
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Crybaby440
Joined: Jan 2003
Posts: 1,142
Central New York
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Worth about a .15 gain. We figure part of that is weight lost.You may pick up a bunch if the exhaust system is junk. Worth all the pain? Probly not just for a time slip.
If the MODS did their job I would not be hitting the notify MOD button. LOL
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Re: When is it worth it to remove the exhaust.
[Re: slippery440]
#991689
05/13/11 10:11 PM
05/13/11 10:11 PM
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Joined: Feb 2004
Posts: 964 Nanaimo, B.C.
GwaiiEagle
OP
Mannix
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OP
Mannix
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
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Quote:
Worth all the pain? Probly not just for a time slip.
Especially with an 8 hour ferry ride and a 100 mile drive to the drags.
First time going with this setup, too. Should just run it and minimize the road headaches.
Drags aren't until the 28th. I'll let you know how they went.
TDRA
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Re: When is it worth it to remove the exhaust.
[Re: GwaiiEagle]
#991690
05/14/11 10:52 AM
05/14/11 10:52 AM
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Joined: May 2004
Posts: 3,210 robin hood country
deaks
master
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master
Joined: May 2004
Posts: 3,210
robin hood country
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Alright untill you run 11.01, or 10.01, then the spanners will be straight out.
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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Re: When is it worth it to remove the exhaust.
[Re: deaks]
#991691
05/14/11 12:21 PM
05/14/11 12:21 PM
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Joined: Feb 2004
Posts: 964 Nanaimo, B.C.
GwaiiEagle
OP
Mannix
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OP
Mannix
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
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Quote:
Alright until you run 11.01, or 10.01, then the spanners will be straight out.
'Spanners'; in U.S. English this means wrenches.
Although 'putting the boot in' means the same thing.
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Re: When is it worth it to remove the exhaust.
[Re: GwaiiEagle]
#991692
05/14/11 12:59 PM
05/14/11 12:59 PM
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Joined: Nov 2004
Posts: 2,825 Sk. Canada
RemCharger
master
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master
Joined: Nov 2004
Posts: 2,825
Sk. Canada
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Quote:
Quote:
Alright until you run 11.01, or 10.01, then the spanners will be straight out.
'Spanners'; in U.S. English this means wrenches.
Although 'putting it in the boot' means the same thing.
Fixed!
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Re: When is it worth it to remove the exhaust.
[Re: RemCharger]
#991693
05/14/11 01:19 PM
05/14/11 01:19 PM
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Joined: Dec 2009
Posts: 21,055 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 21,055
in a cattle trailer down by th...
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I used to drive my 440 Charger to the track bolt on the slicks and run 13.00s all night long. This was when there were 4 different bracket classes so it ran at the bottom of Heavy ET, if I wanted to run in Super Pro I'd drop the exhaust and run 12.80s all night. So for me it was a class ET break, SP paid more than double what Heavy payed.
"Come get your wife"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Front and rear disc and hydroboost conversion. 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: When is it worth it to remove the exhaust.
[Re: Guitar Jones]
#991694
05/14/11 01:55 PM
05/14/11 01:55 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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There is a solution to this, you know. Install cutouts. I run about 18" of 3" pipe off my headers (3" flange); then a set of 3" cutouts, then down to 2-1/2" out the back. I drive to the track, 5 minutes to open up, and away I go. 5 minutes at the end of the night to cork back up. With the old 383, I actually went faster with this setup than open.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: When is it worth it to remove the exhaust.
[Re: 71cuda]
#991697
06/06/11 05:25 PM
06/06/11 05:25 PM
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Joined: Oct 2004
Posts: 1,946 Connecticut
5126brl No more
top fuel
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top fuel
Joined: Oct 2004
Posts: 1,946
Connecticut
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My old setup with 3" TTi and Dynomax muffs added 70 pounds and the car went the same 11.11 to 11.14 every time. So I have never run open headers again.. Too much noise for no reason! OLD SETUP 446 with 1050 dom. and .650 comp flat tappet. 906 heads.
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Re: When is it worth it to remove the exhaust.
[Re: 5126brl No more]
#991699
06/06/11 06:36 PM
06/06/11 06:36 PM
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Joined: Apr 2003
Posts: 1,632 anywhere@ anytime
actionange
top fuel
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top fuel
Joined: Apr 2003
Posts: 1,632
anywhere@ anytime
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Quote:
My old setup with 3" TTi and Dynomax muffs added 70 pounds and the car went the same 11.11 to 11.14 every time. So I have never run open headers again.. Too much noise for no reason!
OLD SETUP 446 with 1050 dom. and .650 comp flat tappet. 906 heads.
You don't take it off because you're too lazy and ...ya know what your daughter said.. LOL
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Re: When is it worth it to remove the exhaust.
[Re: MR_P_BODY]
#991701
06/06/11 10:31 PM
06/06/11 10:31 PM
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Joined: Oct 2004
Posts: 1,946 Connecticut
5126brl No more
top fuel
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top fuel
Joined: Oct 2004
Posts: 1,946
Connecticut
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Quote:
Quote:
My old setup with 3" TTi and Dynomax muffs added 70 pounds and the car went the same 11.11 to 11.14 every time. So I have never run open headers again.. Too much noise for no reason!
OLD SETUP 446 with 1050 dom. and .650 comp flat tappet. 906 heads.
And none of you re-jetted for the open headers so you gained nothing and figured it doesnt matter EDIT but the length of the exhaust might help in making torque because no one puts on a collector extension which the total collector length should be about 16"-18"
Sorry I did not spell out my complete process, Mine was a track only car at this time,
Car had 12" turn down extentions, I also when down about 3 jet sizes if i remember right ,Was 1996 I thought it was a wash since the short times where better but lost 1 mph..
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