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Old 10-02-2002, 05:12 PM
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Know of any Performance Diesel Mechanic in San Francisco Bay Area?

Hi All!

I've seen several posts here on how to increase the performance of the Diesel cars. I have a 1984 300D TurboDiesel and many of the posts have suggested tweaking with the Wastegate and ALDA controllers and removing the trap oxidizer to improve diesel performance.

I understand that some tweaks will shorten the diesel engine's life. Most independent MBZ mechanics won't touch the Wastegate or ALDA controllers. But since my car is 18 years old, I'm sure the Wastegate and ALDA controllers are out of adjustment and was wondering whether any of you know of a mechanic or do it yourselfer who lives in the San Francisco Bay Area and who can diagnose/tweak the Wastegate and ALDA controllers to improve performance a bit or at least put it back to factory specifications. I'm not too technically minded, mind you, so thats that purpose of my asking.

Any and all suggestions will be much appreciated.

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Old 10-02-2002, 05:43 PM
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If you want performance get a SL55...

Diesel arent meant to be speed machines. Meant to transport you from point A to point B efficiently and reliably. The measure of "Performance" in a MB diesel would be how much mileage you can rack up before engine needes rebuilding.
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Old 10-02-2002, 07:15 PM
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I wish I could afford that SL55, but as that is not the case, I am interested in optimizing the performance of the diesel, even though it is not known for performance. Just want it operating at its diesel best.
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Old 10-05-2002, 11:21 PM
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Join Date: Mar 2002
Location: S.F. Bay Area
Posts: 502
Diesel performance


Don't despair, diesels can be performance cars just ask Mercedes about the 1976 diesel version of the C111. Seems they took the normally asperated 300d engine turbo charged, intercooled and tweaked it a few other places stuffed it in the C111, took it down to the Nardi Racetrack in Italy. There they ran it for 50 hours and averaged 156.9 for the entire time.

So the facts are that you can not only have the performance, durablity and better mileage, too.

Check page four here for "300DT Intercooler Pictrues".

By the way, I'm in the Bay Area and just gave another MB devotee a drive in the "Super Diesel".

If you interested in driving a turbo diesel, intercooled and with a manual transmission respond on the Intercooler thread.

I'll look for your reaction there.

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Old 10-06-2002, 12:31 PM
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Join Date: Mar 2002
Location: S.F. Bay Area
Posts: 502


Regarding the preformance upgrade, most turbos aren't actually adjusted for factory boost specs so why don't you get yourself a boost gauge and then you'll know what your turbo is producing. J.C. Whitney hasd one for about $16.00 dollars and you can mount it easily in one of the air vents in the dash. See pictures under "300DT Intercooler Pictures".

Then if you also pick up an adjustment device to put in between the turbo and the wastegate, you can adjust for factory specs. If I remember correctly it's .8-.9 atmospheres. (11.76-13.23 psi.).

Or, drive down and see the real thing.

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Old 10-06-2002, 09:25 PM
crx crx is offline
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Join Date: Oct 2002
Posts: 39
anyone know how much boost a 300sd is producing?
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Old 10-07-2002, 03:09 PM
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Join Date: Dec 2000
Location: Fairfax County, Virginia
Posts: 856
I could take the 603 engine out of my 350SDL, put it into an aero body that weighed 2200 pounds and do pretty well, too.

It is a diesel .... accept it for what it is.
George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg
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