As I wait for my down pipe back exh to arrive...is there any reason I shouldnt cut my muffler off untill I replace the whole system? Just curious and anyone has any gains (hp or mpg or sound) without a muffler.
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2002 Excursion PSD 4x4 XLT Premium- TN BB 1.0 Turbo , 6.0 IC, 8 inch Sky Jacker lift, FOX shocks with remotes, 35-12.50R17 BFG Muds mounted on 17x10 Boyd Coddington Billet wheels, ORU Frozen rotors, custom hybrid intake, DVD/2 monitors, Billet grill, XM radio, DP Tuner PCM QLJ5/PMT1 combo, Edge Juice/Attitude for gauges.
Re: Any reason why I shouldnt cut my muffler off??
I tried it and it sucked. It sounded okay but there was a huge lose in power. I found out that the stock and aftermarket parts have a certain amount of back pressure that is crutial to it running right.
Re: Any reason why I shouldnt cut my muffler off??
I don't quite cotton to the back pressure needed on a turbo charged diesel....
but I will tell u that while it helps a lot with your egt's
and lightens your X about 100 lbs it seems,
it was too much noise on long trips...
in a SD it might be fine,
but I guess the LONG cab of the X just resonates too much and
after a few hours at "SPEED" it wears on ya...
but to each his own - try it you may like it... [img]/ubbthreads/images/graemlins/smokin.gif[/img]
( I opted for a 3.5 to 4" turbo back system from Quad after about 3 months of straight pipe noise and ONE loud trip from dfw to memphis and back !)
Re: Any reason why I shouldnt cut my muffler off??
[ QUOTE ]
I tried it and it sucked. It sounded okay but there was a huge lose in power. I found out that the stock and aftermarket parts have a certain amount of back pressure that is crutial to it running right.
[/ QUOTE ]
Every N/A (normally aspirated) "expert" will tell you that a certain amount of backpressure is required for a good power band, etc.
I'll raise the BS flag on that one for sure!!!! [img]/ubbthreads/images/graemlins/rolleyes.gif[/img]
1. The most ideal situation for ANY turbo charged application is for NO backpressure downstream of the turbo.
2. Even in N/A applications, why do you suppose that there are virtually NO race cars running a restrictive exhauast???? It's all in the tune!!!!!!!! Let me repeat, it's all in the tune.
If you lost power removing the muffler in a turbo charged application, and lost power, one of two things are to blame.
a. It was a percieved loss and not real.
b. There was already something dreadfully wrong with the state of tune.
Now, with all that said, I wouldn't recommend removing the muffler for one simple reason. Extreme noise and drone inside the truck/car.
__________________ TurboDave, EWCS(SW)USN Ret H&N Turbo 6 Racing
Seviervile TN A MAN AND HIS TRUCK, IT'S A BEATUFUL THING 01 Excursion LTD (EBM3) 7.3L, PSD, Turbo, 4X2, TTS Race Magnum (original owner) 86 GN (original owner) 87 GN (second owner) 08 Honda Accord EX-L
Re: Any reason why I shouldnt cut my muffler off??
I took my stock exhaust system off and installed a Magnaflow stainless steel 3.5 down pipe 4 inch after that with their straight through muffler and the drone was a little bit much when towing at 1800 to 2200 RPMs. I installed a flex pipe in the down pipe and the drone got slightly quieter but was still there. Last week I took the flex pipe out and installed a Aeroturbine 4040L resonated muffler in front of the Magnaflow just behind the transmission cross member and the peace and quiet is back along with the performance of a larger exhaust system. I haven't towed the trailer since the Aeroturbine muffler was installed but I think it will be a lot quieter now by how it sounds with just the every day type driving I have done so far. I would not recommend a straight pipe on any of the diesels, they flutter too much and sound like crap in my opinion and would defiantly not recommend a straight pipe on a Excursion or Van. JMHO
FMT
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Re: Any reason why I shouldnt cut my muffler off??
Believe me. Try cutting it off and tell me that the response is not the same during take off and from a crusing to full throttle. It is not the same at all and a week later I installed a magnaflow 4" turbo back exhaust and what a difference. The muffler is a straight design but the small perfs inside it create a small amount of back pressure to keep the turbo spooled for quicker response.
Re: Any reason why I shouldnt cut my muffler off??
The purpose of installing a larger diameter/ less restrictive exhaust system is to help control EGT's when running a chip/ tuner along with a opened up air intake. With the restriction of a stock exhaust, you'll see excessive EGT's sooner.
With turbocharged diesel engines- Less backpressure= Better, but there is a point of diminishing return. Unless you are competing with the full blown Cummins crowd, a 4" turbo back system will probably do just fine. Straight through type mufflers make it more tolerable for the long hauls.
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Re: Any reason why I shouldnt cut my muffler off??
sorry all..I disagree...My F350 has had a straight pipe on since new and then went with a magnaflow and love the sound NO DRONE...Excursion...first mod...4" turbo back with 5" tip no muffler and NO DRONE...sounds wicked to me and I love the growl.. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
CUT THE MUFFLER OFF! It is way to restrictive...
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Re: Any reason why I shouldnt cut my muffler off??
[ QUOTE ]
Believe me. Try cutting it off and tell me that the response is not the same during take off and from a crusing to full throttle. It is not the same at all and a week later I installed a magnaflow 4" turbo back exhaust and what a difference. The muffler is a straight design but the small perfs inside it create a small amount of back pressure to keep the turbo spooled for quicker response.
[/ QUOTE ]
It isn't the additional backpressure that is keeping the turbo spooled for quicker response.
I'm not sure where you got that info, but it certainly wasn't from somebody that knows what they're talking about around turbo charged applications.
As to why your truck behaved the way it did is a mystery, and probably has more to do with how it's tuned, and what other mods may or may not be present. I wouldn't go to a straight through (no muffler exhaust) without other mods for increased fuel delivery. Remember your diesel theory, opposite of gasoline engines, if you go lean, you loose power. Gasoline engines can gain power going leaner (but not too lean).
You opened up your exhaust, probably a LOT, and made for much better flow, and likely leaning the system out more because of the increased flow. Thereby (diesel) loosing power.
Doesn't matter what you're driving, you cant just start hacking things out and making changes to an engine's breathing ability without compensating for it else where.
__________________ TurboDave, EWCS(SW)USN Ret H&N Turbo 6 Racing
Seviervile TN A MAN AND HIS TRUCK, IT'S A BEATUFUL THING 01 Excursion LTD (EBM3) 7.3L, PSD, Turbo, 4X2, TTS Race Magnum (original owner) 86 GN (original owner) 87 GN (second owner) 08 Honda Accord EX-L
Re: Any reason why I shouldnt cut my muffler off??
[ QUOTE ]
Every N/A (normally aspirated) "expert" will tell you that a certain amount of backpressure is required for a good power band, etc.
I'll raise the BS flag on that one for sure!!!! [img]/ubbthreads/images/graemlins/rolleyes.gif[/img]
1. The most ideal situation for ANY turbo charged application is for NO backpressure downstream of the turbo.
2. Even in N/A applications, why do you suppose that there are virtually NO race cars running a restrictive exhauast???? It's all in the tune!!!!!!!! Let me repeat, it's all in the tune.
[/ QUOTE ]
The reason race vehicles dont run a restrictive exhaust is because they are designed to run at high RPM. The back pressure issue of tuning an exhaust is for low-end power and idle.
As someone also mentioned opening up the exhaust will also lean out your mixure and this will need to be compensated for.
Re: Any reason why I shouldnt cut my muffler off??
[ QUOTE ]
sorry all..I disagree...My F350 has had a straight pipe on since new and then went with a magnaflow and love the sound NO DRONE...Excursion...first mod...4" turbo back with 5" tip no muffler and NO DRONE...sounds wicked to me and I love the growl.. [img]/ubbthreads/images/graemlins/biggrin.gif[/img]
CUT THE MUFFLER OFF! It is way to restrictive...
[/ QUOTE ]
You wont get the drone in a truck like you will with an X. Drone is caused by harmonics at the exhaust pipes tip. Being that you do not have your cab over the tip, you will not get the drone. The X has the cab over the tip and that is why you get the drone.
Drone can be eliminated by different placing of the muffler therefore changing the lenght of the tail pipe which changes the frequency (RPM range) of the harmonics that cause the drone. We had a big talk of this about a year ago and it was really informative.
1996 PSD F-350 crew cab 4x4, AB CODE CALIFORNIA TRUCK, 5 speed,CON-O SMFW modified by Southbend Clutch, ORU Reverse Shackle kit, 4:10, u.s. gear chip, IDM MOD BY ME , down pipe, 4 inch straight pipe, boost and EGT gauges,PRO COMP A/T's 305-70's, Bilstein's, ditched the k&n filter for an open element Baldwin PA 2818, kenwood & polk audio sound system.
<><
2002 Excursion PSD 4x4 XLT Premium- TN BB 1.0 Turbo , 6.0 IC, 8 inch Sky Jacker lift, FOX shocks with remotes, 35-12.50R17 BFG Muds mounted on 17x10 Boyd Coddington Billet wheels, ORU Frozen rotors, custom hybrid intake, DVD/2 monitors, Billet grill, XM radio, DP Tuner PCM QLJ5/PMT1 combo, Edge Juice/Attitude for gauges.
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