My 300SD = straight pipe - PeachParts Mercedes-Benz Forum

Actros617 · #1 02-28-2009, 02:09 PM

After Paying $100, Forced to read about STRAIGHT PIPE DISCLAMER, and 3 HOURS of work (I HAVE TO WAIT FOR 3 @#!@^!% Hours IN THEIR STINKY LOBBY!), IT IS DONE... I ll post a video later, i am cold and tired for now, BUT THE IDLE TURBO SOUND IS INTOXICATING I CAN SIT IN THE COLD AND HEAR THAT IDLE WHISTLE mmm....

As for the sound:
Idle Bass sound NOT LOUD AT ALL. is noticeable
Not in gear rev, LOUD outside, A little rumble inside but not annoying
In gear in the cabin
500-1500 DRONE NOISE but not annoying not that loud
1800 & UP, Sounds just like a stock, (as if you have the resinator and muffler is installed)
Outside
500-1500 not so loud outside but not annoying to the neighbors...
1800-Up LOUD and but still not annoying to the neighbors...

As i said i ll post a video LATER now i have to zzzzz....

INTERISTING NOTE: i lost 1 psi in boost doing that straight pipe form 11.5 to 10.5 PSI
made diesel truck driver look twice
Made drivers behind MAD (BLACK SMOKE

BUT NOT SO MUCH just enough to make them mad)
Scared a Cat reving it in netural

oldsinner111 · #2 02-28-2009, 02:47 PM

Sounds real good with a glasspak.

ColLonewolf · #3 03-02-2009, 10:44 AM

Then you removed the resonators and the muffler? How much of that lovely turbo wine do you get when you drive or is it just at idle? I have been contemplating this mod for some time as my 89 F350 7.3L has been stright piped since I got it and I love the sound of the turbo. Was a bit concerned about the in car noise for long trips in the car though. Thanks for the intel.

pawoSD · #4 03-02-2009, 11:03 AM

I have had one for almost a year...and its awesome.

The turbo sound is pretty sweet. I will try to make a video sometime soon of mine....at warm idle it really does sound like a truck.

Mine is a 2.5" pipe from the turbo to the rear....nothing else.

Lexxani · #5 03-02-2009, 11:11 AM

any thoughts on a straight exhaust system (full length pipe to the rear) on a non turbo application?

freeride · #6 03-02-2009, 11:16 AM

To me it sounds too loud, I kinda regret I did this. It was so quiet before my non diesel friends went "Wow!" Now the noise inside bothers me as I drive and i feel redneck, this is MB not a truck. Two reasons I did this:

- I loved my SEC sound with straight pipe, but it was way different car
- from reading posts here I thought the dual resonator is clogged witch huge chunks of soot, turned out it was clean and free flowing

Well, it's ok for now, maybe I'll just play with it and put Ferrari muffler when I find one cheap

pawoSD · #7 03-02-2009, 11:20 AM

Quote:

Originally Posted by Lexxani

any thoughts on a straight exhaust system (full length pipe to the rear) on a non turbo application?

Too loud, the turbo muffles a lot of the sound and keeps the noise level acceptable.....a straight pipe on a non-turbo is going to sound like you're in the engine room of a 1900's ship!

The turbo spools faster and there's more low end torque with a straight pipe....thats the biggest difference I noted....as well as about 1mpg....

Actros617 · #8 03-02-2009, 03:01 PM

Well its has been 3 days so far is i like it and now the new pipe is BLACK covered in a layer of soot!!! I finally took it to the highway and it drives just the same as stock but more smoother IMO, Entering in the highway ramp is awsome, IT JUST GOES like a rocket, though my FLEX pipe form the turbo to the exhaust is cracked and makes a BUZZING noise (simillar to one of those RICER high flow), funny thought is it dose not smoke as much as i though it would be, and the pipe is 2 inch i think, IF your planning to do a straight pipe is best to let the pipe as far form the body to prevent that massive bass sound, I need a chrome tip, i found one on ebay for $30 its a OVAL tip from a 2002 S500 it says AMG on the side i might get it, i hope it fits... I am going to post a video ASAP probally today or tomorrow. I cant really hear the turbo unless if i was beside a wall, like one of those construction barrier or if someone else drives my car and i watch it go. Form 0-60 is 14.5 Seconds improved form 16 seconds, and it makes a shot fart sound when you floor it from stand still i gussing its a 2 inch pipe idk, My next upgrade will be a AERO TURBINE muffler, i heard people says it make it sound good...for now i ll stick with a straight pipe

pawoSD · #9 03-02-2009, 03:07 PM

Chrome tips are too bling, I just have a sawed off pipe.

Actros617 · #10 03-02-2009, 03:09 PM

well i could just get a tip that aims down that way i dont make a black spot on a white car

pawoSD · #11 03-02-2009, 03:13 PM

Quote:

Originally Posted by Actros617

well i could just get a tip that aims down that way i dont make a black spot on a white car

Where I back up in the alley behind our house my car is so long that I come within a few inches of the person's garage every time I back out, so their (white) garage door has developed a black sooty area on it because of my car.

clarencethecool · #12 03-02-2009, 03:19 PM

i recently pulled my exhaust off, from the flange, on my 75 300D. it sounds like a war plane. I found a nice glass pack sitting in the middle of the road and will get around to installing it. surprisingly I have been pulled over twice since then but not for noise violations, one of the cops gave me a jump when i was having battery issues, when the benz fired its throaty growl the cop exclaimed "beautiful" lol its like they are expecting my diesel to be this loud! also the other night i was next to a fairly ricey honda at a light, there was a police officer across the intersection, when the light turned green I opened to WOT for just a second to gain some speed then let off, (this makes an extreme racket) the cop immediately turned his lights on a flipped a U turn, to pull over the honda next to me, while I crept away!!! hhaha

It would be cool to paint a very loud diesel benz as a German war plane!

cell · #13 03-02-2009, 05:23 PM

this raises a question for me: in the case of the 1979 300SD, it has both a muffler and a resonator. I'm curious as to what role each plays. That is, does one deaden sound more than the other?

My assumption is that the muffler makes the system quiet, but that engineers discovered a resonant mode inside the cabin, and put in a resonator to absorb sound of that specific frequency.

thoughts?

Actros617 · #14 03-02-2009, 05:33 PM

The muffler and resinator work together to rid the loud noise, after all its was a luxury car...

Dose anyone know who sells the flex pipe that goes between the turbo and the exhaust pipe or could i use Quick steel but i am afraid that it might STINK Up the entire car when it warms up..

ConnClark · #15 03-02-2009, 05:55 PM

I noticed a drop in maximum boost too when I threw a glass pack on my car. Only mine was about 1/2 a psi. My theory is since the waste gate valve has less pressure behind it is easier for the exhaust gasses to push it open.

If you know how to adjust your boost on your turbo that fixes it.