Re: 2.5 or 3" exhaust? 68 dart 360
[Re: pinkduster]
#1398722
03/08/13 09:54 PM
03/08/13 09:54 PM
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Joined: Jan 2003
Posts: 1,263 Southwestern Ontario Canada
racealittle
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,263
Southwestern Ontario Canada
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When I bought my 1974 360 Challenger it had 3" pipe and flowmasters off the headers. It was loud, and gutless. I bought one of the Jegs $200 mandrel bent exhaust kits with mufflers in the 2.5" size. The car picked up quite a bit and sounded better out of the exhaust tips.
I am lowering the car, removing the headers, and putting '70-'71 high flow factory exhaust manifolds on it. I will make up the required pipe to join up to the Jegs setup and will likely add a set of electic cutouts for fun (that might exit something like the T/A pipe).
Too many cars, too many parts, too little coin, too little space to work in, too little time left to make it all happen!
Update: down to one ride, still too many parts, a little more jingle in the pocket, gaining space, and it's going to happen this year!
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Re: 2.5 or 3" exhaust? 68 dart 360
[Re: GTSDart340]
#1398726
03/09/13 11:25 AM
03/09/13 11:25 AM
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Joined: Oct 2005
Posts: 4,957 WI
Dcuda69
master
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master
Joined: Oct 2005
Posts: 4,957
WI
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Re: 2.5 or 3" exhaust? 68 dart 360
[Re: Challenger 1]
#1398727
03/09/13 11:39 AM
03/09/13 11:39 AM
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Joined: Oct 2003
Posts: 11,685 W. Kentucky
justinp61
I Live Here
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I Live Here
Joined: Oct 2003
Posts: 11,685
W. Kentucky
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Quote:
3" is just silly for a 408, even more stupid for a 360 in a dart!!
You guys are a riot.
Call me silly. I get a kick out of some of your stuff too .
My 340 was about 450 hp, hydraulic cam and pump gas. It had 2 1/2" with flowmaster 40s with turn downs at the rear end. I bracket race the car some and had always run it with the exhaust off and deciced to leave it on one night to see what it would do. It was late in the fall and the air was great, in the first round of open time trials all of my friends ran near their best times. I went out and the car ran 7.45 when it should've been in the 7.20s. When I pulled into my pit I put the ramps on tha trailer and pulled the car on them and took the exhaust off. Went right back out and ran 7.26, the best it had ever ran was 7.24. Now keep in mind that my exhaust turned down before the rear end, no bends over the rear end. This was real back to back runs 10 minutes apart, not some keyboard B.S.
The 408 in my car now is around 550 hp on pump 93 and has 3" exhaust turned down at the rear end, it has gone 6.70 with the exhaust and 6.57 without. Not on the same night so I can't say it's holding it back. I drive this car a lot in the summer, there is no resonance at any rpm and it's only loud inside when I gouge on it.
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Re: 2.5 or 3" exhaust? 68 dart 360
[Re: justinp61]
#1398728
03/09/13 11:51 AM
03/09/13 11:51 AM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
3" is just silly for a 408, even more stupid for a 360 in a dart!!
You guys are a riot.
Call me silly. I get a kick out of some of your stuff too .
My 340 was about 450 hp, hydraulic cam and pump gas. It had 2 1/2" with flowmaster 40s with turn downs at the rear end. I bracket race the car some and had always run it with the exhaust off and deciced to leave it on one night to see what it would do. It was late in the fall and the air was great, in the first round of open time trials all of my friends ran near their best times. I went out and the car ran 7.45 when it should've been in the 7.20s. When I pulled into my pit I put the ramps on tha trailer and pulled the car on them and took the exhaust off. Went right back out and ran 7.26, the best it had ever ran was 7.24. Now keep in mind that my exhaust turned down before the rear end, no bends over the rear end. This was real back to back runs 10 minutes apart, not some keyboard B.S.
The 408 in my car now is around 550 hp on pump 93 and has 3" exhaust turned down at the rear end, it has gone 6.70 with the exhaust and 6.57 without. Not on the same night so I can't say it's holding it back. I drive this car a lot in the summer, there is no resonance at any rpm and it's only loud inside when I gouge on it.
He said his was street car, not a race car. 3" system is heavier than a 2.5" pipe. A dart is a smaller car than my challenger with 3" and it's tight under my E body. I don't care for my 3" X pipe TTI system and my 2.5" H pipe TTI pipes sound way better than the 3" X pipe, way better. I have BB in my 3" car, not a little wimpy 408.
Bigger is not always better is my point, especially for street car. Been there, done it.
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Re: 2.5 or 3" exhaust? 68 dart 360
[Re: Challenger 1]
#1398729
03/09/13 12:07 PM
03/09/13 12:07 PM
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Joined: Oct 2003
Posts: 11,685 W. Kentucky
justinp61
I Live Here
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I Live Here
Joined: Oct 2003
Posts: 11,685
W. Kentucky
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Quote:
[He said his was street car, not a race car. 3" system is heavier than a 2.5" pipe. A dart is a smaller car than my challenger with 3" and it's tight under my E body. I don't care for my 3" X pipe TTI system and my 2.5" H pipe TTI pipes sound way better than the 3" X pipe, way better. I have BB in my 3" car, not a little wimpy 408.
Bigger is not always better is my point, especially for street car. Been there, done it.
Mines a street car too. What does the bad big block Challenger run? 8.20?
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Re: 2.5 or 3" exhaust? 68 dart 360
[Re: justinp61]
#1398730
03/09/13 12:18 PM
03/09/13 12:18 PM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Quote:
[He said his was street car, not a race car. 3" system is heavier than a 2.5" pipe. A dart is a smaller car than my challenger with 3" and it's tight under my E body. I don't care for my 3" X pipe TTI system and my 2.5" H pipe TTI pipes sound way better than the 3" X pipe, way better. I have BB in my 3" car, not a little wimpy 408.
Bigger is not always better is my point, especially for street car. Been there, done it.
Mines a street car too. What does the bad big block Challenger run? 8.20?
I have no idea what it runs because I have never taken it to the drag strip. Even a 10 second ride is not exciting to me anymore on the track. On the street is totally different story. Now it's about cruising in a reliable muscle car for me. My 440 has eddie heads on it and a 6 pak. It'll smoke my 12" wide mickeys at 35 MPH roll.
I just got a go pro camera for Xmas and wanted to use it today but it is still too salty on the streets. I've been downtown and to work already today on separate trips checking out the streets because it's going to be 55 today and the rest of the snow will melt. It's gonna have to wait. My cars are no slouches but I'm not claiming to have the fastest car.
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Re: 2.5 or 3" exhaust? 68 dart 360
[Re: JohnRR]
#1398732
03/09/13 04:54 PM
03/09/13 04:54 PM
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Joined: Nov 2004
Posts: 6,653 Near Reading PA USA
pinkduster
master
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master
Joined: Nov 2004
Posts: 6,653
Near Reading PA USA
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Quote:
Quote:
you should have stayed with this post only ...
YEAH, I know! All this talk about pea-shooter sized exhaust is quite entertaining though.
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Re: 2.5 or 3" exhaust? 68 dart 360
[Re: justinp61]
#1398734
03/11/13 04:47 PM
03/11/13 04:47 PM
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Joined: Apr 2005
Posts: 15,134 Kelowna, B.C. Canada
DPelletier
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 15,134
Kelowna, B.C. Canada
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Quote:
Quote:
3" is just silly for a 408, even more stupid for a 360 in a dart!!
You guys are a riot.
Call me silly. I get a kick out of some of your stuff too .
My 340 was about 450 hp, hydraulic cam and pump gas. It had 2 1/2" with flowmaster 40s with turn downs at the rear end. I bracket race the car some and had always run it with the exhaust off and deciced to leave it on one night to see what it would do. It was late in the fall and the air was great, in the first round of open time trials all of my friends ran near their best times. I went out and the car ran 7.45 when it should've been in the 7.20s. When I pulled into my pit I put the ramps on tha trailer and pulled the car on them and took the exhaust off. Went right back out and ran 7.26, the best it had ever ran was 7.24. Now keep in mind that my exhaust turned down before the rear end, no bends over the rear end. This was real back to back runs 10 minutes apart, not some keyboard B.S.
The 408 in my car now is around 550 hp on pump 93 and has 3" exhaust turned down at the rear end, it has gone 6.70 with the exhaust and 6.57 without. Not on the same night so I can't say it's holding it back. I drive this car a lot in the summer, there is no resonance at any rpm and it's only loud inside when I gouge on it.
I bet those crappy flowing Flowmasters cost you far more restriction than the 2.5" pipe does/did
Dave
1970 Super Bee 440 Six Pack
1974 'Cuda
2008 Ram 3500 Diesel
2006 Ram 3500 Diesel
2004.5 Ram 2500 Diesel
2003 Ram 3500 Diesel
2006 Durango Limited
[url] http://1970superbee.piczo.com [/url]
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Re: 2.5 or 3" exhaust? 68 dart 360
[Re: Dr-Dave2]
#1398737
03/12/13 10:07 AM
03/12/13 10:07 AM
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Joined: Jan 2003
Posts: 338 Montreal Quebec
STROKIE
enthusiast
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enthusiast
Joined: Jan 2003
Posts: 338
Montreal Quebec
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Quote:
The DynoMax tech section has some good information about calculating exhaust diameter based on C.I,D. and horse power seems like muffler selection is also a factor in their calculations http://www.dynomax.com/assets/2012catalog_pdf/2012_Dynomax_techsection.pdf
As per DynoMax tech piping chart about horsepower. It is brake horsepower or rear wheel horsepower. Big difference... My engine is a 451 with 373 RWH and I use 3.00 may be It's too big.
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