Question about 1984 Mercedes-Benz Mercedes Benz 300 Class

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Looking for more Power from my 300CD Diesel engine

These days, everyone has heard about the amazing power that can be found from tweaking a diesel or adding extra components. I have a 1984 300CD and am very skilled at mechanical fixes and troubleshooting, but I still can't find any info on how to get more power out of my little turbo charged 5 cylinder diesel engine. Anyone ever try to ''trick'' their mini diesel engine?

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  • loft404
    loft404 Jun 18, 2009

    EW, thanks, you're right I dont want to shorten the life of the engine or kill the MPG. I love the car and so far I have 290,000 miles on it and on highway it has no problem getting up to 100-110mph, though I dont like the rpms going past 4k. I guess most important for this car is the initial traffic light to traffic light need for low end well as those scary moments at a yield sign getting onto a fast and busy do I wish I could just get up to traffic speed quickly without getting hit in the rear. Thanks for the info either way:)

  • loft404
    loft404 Jun 18, 2009

    HAha...yes I know. But if I had the money I'd go for one of those new Tesla Roadsters, I think they might even smoke the porsche....second choice is the MeanGreen Super biodiesel 65 Impala featured on Pimp my Ride a couple years ago...I think I'm in love with that car...

  • loft404
    loft404 Jun 18, 2009

    Aha, what about a diesel diaper ! I could pin one to the back of my car with lavender scent every time I accelerate. But diesel, no electric...then tell me what you suggest is closest to a closed loop transportation device for those of us who can bicycle or take the train to work. I like the idea of a possible biodiesel hybrid...havent seen one yet, but that would be pretty clean...hydrogen sounds neat, but the production of all the parts and fuel seems to create it's own problems. Corn and soybeans seem smartest...or wind powered generation of electricity to charge electric vehicles...and to get around lead acid batteries, why aren't we seeing more use of capacitors instead, maybe not soley, but they can be used in support of the batteries and are much lighter. I like this topic, what have you heard that seems practical...or should we just throw that word out the window since it's infrastructure that is seeming to bee in the way?

  • Marvin
    Marvin May 11, 2010

    If u knew hat i know about electric cars u would not think the way u do, ignorance is truly bless. as far as diesel goes never would own one, and they pollute and smell, u should be behind your smog producing car in traffic.

  • Marvin
    Marvin May 11, 2010

    buy a Corvette.(:

  • Marvin
    Marvin May 11, 2010

    these tricks you here about involve changing the boost pressure to the engine from the turbo and changing the fuel flow through the injectors, this can be done because modern diesels are electroniclly controlled, your system is mechanical, so there is no way to change the engine programming. U can increse boost but u must also add more fuel, to do this would cost allot of money as the injection pump would have to be modified, the other side is that u will decrese the life span of the engine and the fuel comsumption will go up allot, there are no free lunches.



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You turn up your ADLA,but you wont have any overboost protection,some guys remove this,or you can just clean it out,this gives the boost to the turbo.

Posted on Jun 23, 2009

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Those old engines were made to last - compare the weight of the motor to one of similar capacity nowadays; the old ones were made of cast iron which is quite heavy, the newer ones like the C270CDi Mercedes motor weighs about 30-40%less due to aluminium parts. Longevity suffers, but you need less power to drive the engine, giving you more power to drive the car. Furthermore, the common rail injection used nowadays are a lot more flexible and powerful, due to the fact that the exact amount of diesel needed per cylinder stroke is injected, whereas the old system injected a fixed amount per stroke, whether you are doing 20mph or 80mph. So, it overfuels at low revs and underfuels at higher revs. To prevent it from burning too lean the engine has a rev limit, roughly where the mixture is running at "100%" effectivity. The newer motors use computers to make the decisions based on 83452 different inputs, the older ones just measured the diesel needed and the air supplied.

So, the sad news is that the only way to get the car to perform a lot better is to put in a new moter eg. C270CDi, or put in a REAL motor like a 350Chevy :-D but leave the 300D badge on and see the other guys $h@ their pants when this "diesel" smokes them!

Posted on Jun 18, 2009


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