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Discussion Starter #1
So my "treasured" Carlsson rear box is finally installed and resonator deleted. I must admit, I was a little uneasy about deleting the resonator at first, watched quite few video clips and listened the sound clips. Renntech used it on their cars, mahunt recently posted nice pictures of the "eliminator" piece and since the late R129's did not come with the resonator at all, I got rid of mine.

Very nice young guys with great skills and car enthusiasts, they do great custom work https://www.facebook.com/eagexhaust/

Results - could not be happier! It's deep buttery at the start and under load, and yet, while just cruising at any speed, there is absolutely NO drone and annoying tones. Driving home from the shop yesterday, purposely took a longer route, with highway and twisty river road mixes, never turned on the radio once for 40 min drive. Just enjoyed the variations of these very very pleasing buttery tones of new exhaust.

WP_20180705_19_49_23_Pro by Duh_Vinci, on Flickr

20190425_144901 by Duh_Vinci, on Flickr

P1010977 by Duh_Vinci, on Flickr

2019-04-26_12-52-14 by Duh_Vinci, on Flickr

Regards,
D
 

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I too was pleasantly surprised at the very reasonable tone improvement from my own efforts.

The resonator eliminator adds just the right amount of exhaust note without overwhelming the whole setup. It is magical.

For anyone contemplating the switch to resonator eliminator (98 and earlier cars), bear in mind that this is what MB did to the 99 and up V8 SL500. I happen to think this is the sole reason for whatever performance improvement was "gained" by the switch from the M119 engine to the M113.

I will be visiting the dragstrip in a few weeks to see if there is any performance improvement with the resonator eliminator on my car from last 1/8th mile time of 9.02 seconds.
 

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Discussion Starter #3
...The resonator eliminator adds just the right amount of exhaust note without overwhelming the whole setup. It is magical.
Well said, it really is magical, very pleasant to the ear!

...I will be visiting the dragstrip in a few weeks to see if there is any performance improvement with the resonator eliminator on my car from last 1/8th mile time of 9.02 seconds.
I would be very interested to hear about your results. Its almost silly to mention, but for what it's worth... My "butt-dyno" (sure, can be attributed to placebo effect), but after quite few miles with in the last 24 hours after this new exhaust pieces, the car feels a little different. M119, generally seem to "wake up" at 3000 rpms (or so)... And this wake up is fairly noticeable. Not any any longer (or so it seems), even with the light throttle, the wake up starts a bit earlier, as if one is seeing an earlier rise and smoother rpm/torque curve than it was before, it is almost "effortless" with lighter pedal feel under acceleration?

Am I imagining things? Maybe, however, to me, the car feels a bit more light footed. Next - going to swap my factory LH module for the WOT enrichment unit and allow the adaptation to take place.

Regards,
D
 

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My V12 also seems quicker, but that's why I'm going to the dragstrip to see if it's just my imagination.

Even if it isn't quicker, the car is more enjoyable to drive just because of the exhaust feedback.
 

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Discussion Starter #5
Good! I'm glad you too feel the difference! Your numbers will show, please share. For now, indeed, just more enjoyable car with this exhaust feedback for sure.

Regards,
D
 

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Discussion Starter #7
Do you think it would change the m113?
Your car is 1999, not sure if there is any difference in month of the build, but you most likely already have the resonator missing from factory (check under the car, see if there is a second box just before the driver's side axle (2 pipes in one out)?

Regards,
D
 

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Oh yes, I am missing the resonator.

Do you think it would change the m113?
Your car is 1999, not sure if there is any difference in month of the build, but you most likely already have the resonator missing from factory (check under the car, see if there is a second box just before the driver's side axle (2 pipes in one out)?

Regards,
D
 

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If it's good enough for the factory 1999 and up V8 R129s, then it's good enough for the earlier cars.
 

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You guys comparing m113 to m119(pre1998, post 1998). M113 of later ‘98 is missing resonator from factory. M19 came with one from factory. Be advised, depending on numerous things, in general, reducing backpressure May free a few ponies, but usually at the cost of low end torque. If loosing the resonator reduces backpressure, torque may drop on low end. Seems like the engineers at MB probably figured best for the task a 129 was to fill, in other words, best all around performance. I believe changes will garner improvements, but not across the spectrum. Gaining on one end but loosing on another is what I believe will be the result. Nothing wrong with that. Best know the consequences so an informed decision can be made. Seems like a lot of mental masturbation for “noise”... If someone has torque/power curves to share, then all would have info to make an informed decision... 1 test can cure a thousand opinions.
 

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A drop in low end torque you say?

The V12 M120 probably has a little to spare on the bottom end, I'm not worried.

I'll find out in a few weeks whether or not the resonator eliminator change has veered into self abuse with a trip to the track.

If RENNtech and MB (MY 99+ cars) saw the wisdom in removing the resonator for increases in performance, then I'm willing to roll the dice myself.

The "noise" is kind of hard to pin down as there is no difference (even with the top down) during steady state driving. In my case, the only difference in exhaust note is when the engine starts and during acceleration. It's subtle, but noticeable only due to the almost completely silent stock exhaust. I don't think anyone other than an R129 owner would notice. It's not overt in any way and the slight increase in sound during acceleration speaks volumes to the mechanical sophistication that is a DOHC 4 valve engine, quite nice.

Don't be so quick to judge unheard, besides, if you ever did hear one of these exhaust systems; you might become a convert.
 

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A drop in low end torque you say?

The V12 M120 probably has a little to spare on the bottom end, I'm not worried.

Don't be so quick to judge...
You will note upon re-read that I made no comment on the M120, and was pointing out that using a later V8 car without a resonator from factory as a reason to eliminate may be flawed logic.

Also, you will note I did not judge... Just suggested a little thought may be prudent before making a change for noise-sake.

PS... I do like the sound of a well-tuned muscle car exhaust!
 

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Discussion Starter #14
Lets agree, that when a manufacturer "creates" an automobile for a general public, there are compromises to be dealt with. Even, even if there were some type of improvements in terms of power/torque gain with less restrictive exhaust, per say "no resonator", however, the noise level measured was deemed too loud to meet the "standards" (whatever those standards may be), and MB chose this resonator to been installed permanently to keep those "horrible horrible" noises down.

From an old post of 500E guys "...When contacting Gillet regarding their manufacture of the AMG E500E muffler, I enquired about deleting the center muffler section. I was told they made a few "test pieces" but it was rejected because of unacceptable noise..." Could it have improvement on performance? Possibly, but again, a compromise was reached...

I wanted to hear this m119 under acceleration, and that is now accomplished... If I gained anything overall in terms of power, great, if not, the response from the motor with this new setup is noticeably different, noticeably lighter throttle feel up to 3K rpms (the curve feels different).

I will do a full transmission Redline High Temp fluid change when I get this car back from the paint shop, and will drive the devil out of it, from what I remember, factory 1994/1995 SL500 0-60 was 6.2?

This is a soft pull on the day of the exhaust modification (no tire spin, no ASR off, no brake holding, no red line),

I've tried timing few times by watching this small clip, and I get 5.85-5.9 sec with the phone stop watch... so I will make few runs with new fluids to see if there is any difference in those times (with holding the brake, with ASR off and up to red line) and another run once I swap the LH module for the WOT enriched unit. For now, love the sound of my new exhaust.

Regards,
D
 

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One of the BW Old Guard/R129, W204 Moderator
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Lets agree, that when a manufacturer "creates" an automobile for a general public, there are compromises to be dealt with. Even, even if there were some type of improvements in terms of power/torque gain with less restrictive exhaust, per say "no resonator", however, the noise level measured was deemed too loud to meet the "standards" (whatever those standards may be), and MB chose this resonator to been installed permanently to keep those "horrible horrible" noises down.

From an old post of 500E guys "...When contacting Gillet regarding their manufacture of the AMG E500E muffler, I enquired about deleting the center muffler section. I was told they made a few "test pieces" but it was rejected because of unacceptable noise..." Could it have improvement on performance? Possibly, but again, a compromise was reached...

I wanted to hear this m119 under acceleration, and that is now accomplished... If I gained anything overall in terms of power, great, if not, the response from the motor with this new setup is noticeably different, noticeably lighter throttle feel up to 3K rpms (the curve feels different).

I will do a full transmission Redline High Temp fluid change when I get this car back from the paint shop, and will drive the devil out of it, from what I remember, factory 1994/1995 SL500 0-60 was 6.2?

This is a soft pull on the day of the exhaust modification (no tire spin, no ASR off, no brake holding, no red line), https://youtu.be/cS4I8tMIXyU

I've tried timing few times by watching this small clip, and I get 5.85-5.9 sec with the phone stop watch... so I will make few runs with new fluids to see if there is any difference in those times (with holding the brake, with ASR off and up to red line) and another run once I swap the LH module for the WOT enriched unit. For now, love the sound of my new exhaust.

Regards,
D
Cool Beans!
 

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what is the LH module and the WOT enriched unit ? I'm an SL500 newbie and learning as I go but very interested in slightly increasing the growl of the M119 without incurring long distance driving drone or performance so thanks for a very interesting thread.
 

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Discussion Starter #17
what is the LH module and the WOT enriched unit ? I'm an SL500 newbie and learning as I go but very interested in slightly increasing the growl of the M119 without incurring long distance driving drone or performance so thanks for a very interesting thread.
Cheers!

This LH module is located under the hood, in the aluminum computer box (same area where you will find 38 pin diagnostic port, same place where the E-Gas module, and such, once the cover is opened, you will see all of them stacked in the row, basically the computer brain for these non-CIS pre-face lift cars)

Some curious minds figured out that that some early models of W140 fitted with M119 5.0L engines were equipped with LH modules that were a little different from the others, they had a Wide Open Throttle enrichment, basically "richens the mixture" at WOT... And when dyno tested, depending on the condition of M119 engine, once fitted into compatible non-W140 car, would provide additional horse power, certainly not a huge amount, but up to 10HP in some cases. Very popular mode with w124 E500E owners. Personally, I will take any known and proven upgrade/update for m119 I can get my hands on. And these are affordable.

Regards,
D
 
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