Success - I did it! - PeachParts Mercedes-Benz Forum

oldsouth · #1 10-28-2001, 01:16 AM

Well, after over a year of tinkering I successfully disconnected the EGR on a computer controlled 1995 S-350. Car was using a little oil through the turbo and I had it overhauled. Had them put a pressure control wastegate instead of the stock vacuum controlled unit. Plumbed it to the intake manifold and adjusted it to 14psi boost @ 4000 rpms in third as the book calls for. Now let that computer try to cut boost. Car is 1 second quicker to 60 mph and is getting better fuel mileage but best of all, NO MORE GUNK AND SOOT IN THE INTAKE! Can you tell I'm happy or what.

ymsin · #2 10-28-2001, 02:58 AM

I had to CONGRATULATE you upon reading your accomplishment.

#3 10-28-2001, 03:35 AM

Has your engine been rebuilt? I would not push that engine if I were you!! Be carefull with that thing.

oldsouth · #4 10-28-2001, 03:25 PM

No, the engine has never been rebuilt. I will know in a couple of weeks if the oil consumption was the turbo or the engine. I am 90% sure it was the turbo. Started all of a sudden and Garrett said it was definitely leaking oil. The engine has always ran great in this car and gets 25-30 mpg. In my opinion the main problem with the 350 diesel is all the soot that it breathes. You would not believe the gunk that collects in the intake. And just think how much more goes through the engine. In my opinion an engine should intake only clean filtered AIR. I think that is the life of the 350 diesel. My 2 cents worth.

michael rybikowsky · #5 10-29-2001, 08:33 AM

Old South.With that kind of title,I hope you are a member of the S.C.V My name is Michael Rybikowsky.What is yours.bestregards Michael.SCV MOS&B.FFV.

Snowman · #6 02-21-2002, 10:49 PM

I got a 1994 S350. What exactly does this EGR do? You mention something about your car being much faster because of it. Any info would be much appreciated.

oldsouth · #7 02-24-2002, 04:47 PM

EGR stands for exhaust gas recirculation. The valve recirculates already burnt exhaust into the intake to lower the combustion temperatures to reduct the nox emissions. The main problem with this is that soot coates the intake passages and the fuel does not burn as efficiently. Take your crossover pipe off and look into it.

Snowman · #8 02-25-2002, 09:52 PM

Thanks for the info.

Grdenko · #9 02-06-2004, 12:24 PM

oldsouth,

wondering if you could give us an update on your wastegate. hows it doing? looks like that was about 2 years ago, hopefully you havent sold the car.

ive had trouble with my computer controlled EGR and wastegate, i have at least 1 bad vacuum transducer and probably some bad lines, but only to the EGR and wastegate (all of the others were replaced 2 years ago, mechanic just disconnected the line to the wastegate and EGR, he didnt realize it was computer controlled).

i was thinking that either i could pay $90 each for new transducers and $20 for new hoses and still have exhaust blowing into my intake, but the turbo would be working again,
OR i could do something like you did (which i think i would prefer)

how much did it cost to get that done?
has anybody else here done it?

thanks

oldsouth · #10 02-06-2004, 01:57 PM

Yes, I still have the car. Everything is still working great! Since I originally did the modification, I have installed a Dawes boost pressure controller inline between the turbo and the intake manifold. This is a better setup than trying to adjust the wastegate. I see you are in Houston, Check with these people http://www.mddistributors.com/locations.html

They are the ones that rebuilt my turbo and are in Houston. If it is a Garrett, they could get the proper pressure operated wastegate for it. Be sure to adjust it where it will fully close and run a vacuum line to the intake with the Dawes device inline to regulate pressure. http://www.dawesdevices.com/

Cost is about $50-75 for the wastegate maybe less and $43 for the controller.

I would not hesitate doing the modification, well worth it. I had my intake off a few months ago and it was clean as a whistle. I also have my blowby routed to atmosphere to keep any oil whatsoever out of the intake. I have had mixed results with that. It keeps the intake perfectly clean but drips oil out the hose in the garage and there is smokey fumes that constantly come out it. Doesn't bother me but it might bother other people.
Good luck!

Grdenko · #11 02-09-2004, 03:59 PM

that sounds great, ill do it as soon as i can

that sounds really cheap, i see that the dawes device is easy to install yourself, but does that price on the wastegate include labor? i dont think id want to do that myself.

thanks

oldsouth · #12 02-09-2004, 07:55 PM

It's really simple. Two nuts hold it on. The hardest part is hooking the pin back up to the wastegate controller. You can use compressed air to retract the rod. That is how I did it. Labor should not be over about $75 to install.

michakaveli · #13 02-09-2004, 08:59 PM

Quote:

Originally posted by oldsouth
No, the engine has never been rebuilt. I will know in a couple of weeks if the oil consumption was the turbo or the engine. I am 90% sure it was the turbo. Started all of a sudden and Garrett said it was definitely leaking oil. The engine has always ran great in this car and gets 25-30 mpg. In my opinion the main problem with the 350 diesel is all the soot that it breathes. You would not believe the gunk that collects in the intake. And just think how much more goes through the engine. In my opinion an engine should intake only clean filtered AIR. I think that is the life of the 350 diesel. My 2 cents worth.

That S-350 is gorgeous.

oldsouth · #14 02-09-2004, 11:58 PM

Thanks, here is a more recent photo.

Grdenko · #15 02-10-2004, 02:14 AM

is the car as fast as it used to be? does the EDS still give you the extra fuel even though it thinks the turbo wastegate is open?

the dawes device website says it goes inline between the intake manifold and wastegate. is there some kind of pressure line that runs between them even on the mechanical wastegate?

sorry for the grand inquisition, but id really like to do this in my car if it really works like the fatory setup did.

thanks

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