trying to get a little more umph on the cheap
 

This is in relation to BenzTurbo's thread on driving a MB hard. I removed the EGR devices off the motor, I have new injectors installed, all the strange noises are gone, It sounds like a mule gargling marbles. starts easy, no smoke. would I gain anything by replacing the muffler with a more free flowing one or even straight pipe?

Hmm... I can't say I'm familiar with this sound.

Dkr.

I searched youtube for "mule gargling marbles". This is what I got:

https://www.youtube.com/watch?v=wtX-o7IyvNI

I don't think that's what the OP's car sounds like.

Straight piping will get you some more noise and maybe a little quicker turbo spool up. I've been considering straight piping mine just for the sound, but I haven't gotten around to it yet.

We have a performance sub forum here for hot rodding the diesels. I'm sure this has been covered there. As for me, when I want to go fast, I just ride my motorcycle.

i want to get get an exhaust off a 300d at the pick n pull so i can cut the rear muffler off and make a nice looking straight pipe that comes out at 45 degrees but still tucked under the car for the most part. i will leave the resonator to help with any drone and because i would get tired of very loud exhaust all the time. :) i want to keep my cd's exhaust because i'm sure it is coupe specific and i will probably want to re install it one day after i have my fun with "big truck" exhaust :D

It depends...
If your catalytic converter is partially plugged, straight piping will certainly improve performance. If everything is right though, only minor changes, and sound will increase.:(

I want my car to sound like this! :D

It purrs at the moment but this is the sound I need for a classical car.;)

The Mufflers on a w123 are already a straight through design. So replacing them with a Cherry Bomb, Glass pack, or some type of performance type muffler won`t do much to increase your Dyno seat of the pants off the line to the next red light, or time off the clock.


http://i128.photobucket.com/albums/p...m/muffler2.jpghttp://i128.photobucket.com/albums/p...m/muffler1.jpg




Charlie

I think you will find that a straight pipe, if you go that way, will sound really "blatty" or sharp and unpleasantly loud at some points in the rev range. I had a straight pipe unintentionally a long while back when my exhaust broke ahead of the muffler. Did not like it at all.

I've run a DT466 International and heard several N-Series Cummins engines straight piped. They sounded pretty good to me.

I see ...........
I live in an area flooded with straight-piped diesel exhausts. Dodge, Ford, Chevrolet and a myriad of medium and heavy duty trucks. As usual, they just sound like they have more oomph. Personally, I could do without all the noise pollution.

I had a diesel Ford that the PO had installed glass-pack mufflers on. Hated the noise, especially on any trip greater than 30 minutes. I've seen/heard vehicles with a "rumbling" exhaust noise that isn't too bad. But, as previously mentioned, a "blatty" exhaust note just sounds immature to me. (Fart can exhausts come to mind.) On a classic car, I just don't see the point. :rolleyes:

well that settles that. not much gain for a lot of extra noise

Have you done the wastegate swap yet? On both of mine, I recovered power I hadn't even known I'd lost.

I removed the egr and the throttle plate device, the turbo is working. I just replaced the injectors with monarks as well as replacing all the vacuum lines. For all this effort I got from snail speed to land tortoise.

I thought the W124 diesels were supposed to be considerably faster than a 123 turbo.

After straight piping my car it feels like I gained about ten hp, lower in the rpm range, and turbo spools up about 500rpm sooner at least. As for people saying it will be too loud, it's only loud if the exhaust doesn't exit outside from under the car (if the exhaust exit is under the car it's loud). Go auth a turn down tip and you should be good.

Also, I think I saw a post about about a catalytic converter I think? Pretty sure these diesels never had them