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When is it worth it to remove the exhaust. #991683
05/13/11 02:38 PM
05/13/11 02:38 PM
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
GwaiiEagle Offline OP
Mannix
GwaiiEagle  Offline OP
Mannix

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Posts: 964
Nanaimo, B.C.
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.
Re: When is it worth it to remove the exhaust. [Re: GwaiiEagle] #991684
05/13/11 02:40 PM
05/13/11 02:40 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline
master
Crizila  Offline
master

Joined: Oct 2003
Posts: 7,506
Az
For sure.


Fastest 300
Re: When is it worth it to remove the exhaust. [Re: Crizila] #991685
05/13/11 02:50 PM
05/13/11 02:50 PM
Joined: Aug 2003
Posts: 11,179
Atco NJ
DJVCuda Offline
I Live Here
DJVCuda  Offline
I Live Here

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Posts: 11,179
Atco NJ
with proper AFR I saw 51 hp difference from my 2.5" muffler shop system to open headers...

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
Joined: Aug 2003
Posts: 43,007
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
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Joined: Aug 2003
Posts: 43,007
Bend,OR USA
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)
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
Joined: Jan 2003
Posts: 1,142
Central New York
slippery440 Offline
Crybaby440
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Posts: 1,142
Central New York
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
Re: When is it worth it to remove the exhaust. [Re: slippery440] #991688
05/13/11 05:45 PM
05/13/11 05:45 PM
Joined: Nov 2009
Posts: 3,082
St. Paul , Mn.
tubtar Offline
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tubtar  Offline
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St. Paul , Mn.
Unless you are running heads up , I'd figure what it likes , write it on the window and go some rounds.
If you have to go as fast as possible , then go for it.
But be ready to jet and tweak a bit.
I'd say that the 1 3/4 primaries are already a restriction if you are looking to go for the whole Magilla though.

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
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
GwaiiEagle Offline OP
Mannix
GwaiiEagle  Offline OP
Mannix

Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
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

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
Joined: May 2004
Posts: 3,210
robin hood country
deaks Offline
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deaks  Offline
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robin hood country
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
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
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
GwaiiEagle Offline OP
Mannix
GwaiiEagle  Offline OP
Mannix

Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
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.

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
Joined: Nov 2004
Posts: 2,825
Sk. Canada
RemCharger Offline
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Sk. Canada
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!

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
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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Guitar Jones Offline
Paddle faster! I hear banjo music!
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in a cattle trailer down by th...
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.


"Follow me the wise man said, but he walked behind"


'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. Rear disc and hydroboost coming soon!
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
S
StealthWedge67 Offline
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StealthWedge67  Offline
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Posts: 4,319
Puyallup, WA
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
Re: When is it worth it to remove the exhaust. [Re: GwaiiEagle] #991695
06/06/11 12:24 PM
06/06/11 12:24 PM
Joined: Feb 2004
Posts: 964
Nanaimo, B.C.
GwaiiEagle Offline OP
Mannix
GwaiiEagle  Offline OP
Mannix

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Posts: 964
Nanaimo, B.C.
Car ran a 7.53 in the 8th. With severe axle wrap.

850DP has not been touched, so I think there may be some there, too.

The 28" tall ET Drags made a monkey of the 3.91 gear.

Never took the exhaust off.

Re: When is it worth it to remove the exhaust. [Re: GwaiiEagle] #991696
06/06/11 02:04 PM
06/06/11 02:04 PM
Joined: Apr 2005
Posts: 205
upstate new york
7
71cuda Offline
enthusiast
71cuda  Offline
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Posts: 205
upstate new york
just tryed it sunday with my 75 duster 360 ootb edelbrock magnum heads,solid cam 904 trans,small tti headers,2 1/2 Pipes full exhaust.
ran 12.37 @108 open header,12.38@108 with the exhaust.

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
Joined: Oct 2004
Posts: 1,946
Connecticut
5126brl No more Offline
top fuel
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Connecticut
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.

Re: When is it worth it to remove the exhaust. [Re: 5126brl No more] #991698
06/06/11 06:14 PM
06/06/11 06:14 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
Master
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Romeo MI
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"

Last edited by MR_P_BODY; 06/06/11 06:19 PM.
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
Joined: Apr 2003
Posts: 1,627
anywhere@ anytime
A
actionange Offline
top fuel
actionange  Offline
top fuel
A

Joined: Apr 2003
Posts: 1,627
anywhere@ anytime
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

Re: When is it worth it to remove the exhaust. [Re: actionange] #991700
06/06/11 06:40 PM
06/06/11 06:40 PM
Joined: Jun 2010
Posts: 3,112
LONG ISLAND
fishy340 Offline
master
fishy340  Offline
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Posts: 3,112
LONG ISLAND
when ur spraying it with 200 shot

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
Joined: Oct 2004
Posts: 1,946
Connecticut
5126brl No more Offline
top fuel
5126brl No more  Offline
top fuel

Joined: Oct 2004
Posts: 1,946
Connecticut
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..

Re: When is it worth it to remove the exhaust. [Re: actionange] #991702
06/06/11 10:33 PM
06/06/11 10:33 PM
Joined: Oct 2004
Posts: 1,946
Connecticut
5126brl No more Offline
top fuel
5126brl No more  Offline
top fuel

Joined: Oct 2004
Posts: 1,946
Connecticut

You don't take it off because you're too lazy and ...ya know what your daughter said.. LOL




It was "I am lazy and inpatient" and in Italian no less!!

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