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Discussion Starter #1
I was given a 1985 300D to drive as my first car, but i have somewhat of a facination with speed, so this car just wont cut it as it is. I am looking for anything that will get me more power out of this car. Anything is a help. I have even thought of throwing a crate engine in there, but im not sure what will fit. If anyone knows about doing anyhting of the sort please tell me.

Thanks,
Steve
 

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I have seen that body car with chevy v-8's before, but I don't think there are any kits for such a conversion.

If you want to get the most out of what you have, you can make sure it is in proper tune and the boost is to spec (it is often below spec).

If you want a little more, then I understand that propane injection in diesels works much like nitrous injection in gas engines...
 

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Discussion Starter #3
Thanks.

I heard of that. I have an aquaintence who threw a rod with propane, so I probably wont attempt that. I also looked for a new turbo without any luck because I could only find extremely large ones that would also probably blow something out. Also, do you have anymore information about the V8 that you know of? Like size of engine?, cost ifthey payed for it to be done?, if the rest of the drive train was able to support it?, and if there were any major chasis modifications needed for more space?
 

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The only reason I am aware of the conversions having been done is because I have seen conversions for sale occasionaly.

The drivetrain is more than likely able to handle it, especially since it is basically the same transmission used the the Porsche 928. The Porsche has a different case to allow for the rear mounting and diffenential integration, but the innards are mostly the same. Some 928 tuners have claimed 400+ rwhp without problems.

If I were to do a chevy conversion on any car, I would probably want to use the R700 transmission with the locking torque converter anyway. This would simplifly installation, leaving only custom mounts and a custom driveshaft.

If you want a car with more power, then why don't you just get a car with more power? A conversion could cost several times what the car is worth, and create alot of downtime. Something like an 80's or 90's Mustang offers impressive 0-60 times, plenty of tuning options, and is cheap to buy and repair too.
 

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Discussion Starter #5
I have thought of that too, however, I live in the S.F. Bay area and I am a young male driver and insuence will cost a fortune for me to pay on a car registered as a V8. Im just trying to consider my options and fine the cheapest overall was of getting a pretty fast car, and I just dont want to go for a rice rocket.

Thanks for your help.
Steve
 

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speed

Hi Steve,
Your 300D SHOULD do zero to 60mph in aprox 14 seconds IF everything is functioning as the FACTORY intended.
Make sure that you have a clean (or NEW) air filter
adjust your valves to spec (required every 15,000 miles)
run DIESEL SPECIFIC OIL and change it hot and often
Clean the "banjo bolt" fitting at the rear of the intake manifold with carb cleaner and a pipecleaner. it should NOT be clogged!
Make sure that the vacuum line from the banjo bolt to the trubo boost wastegate on the firewall is also clean.
Same with the vacuum line to the top of the IP (injection pump) at the ALDA...........some further research on the ALDA will help in the future....HOWEVER........BEWARE AND BE VERY CAREFUL!!!!
There are some other things that can be done inexpensively....ie; bumping UP the MAX turbo BOOST etc.
If you really MUST have a FAST car, then perhaps you should just SELL the 300D to someone who knows just what a JEWEL they happen to be. 8O
Best wishes always,
Spo out 8)
By the way..............please do NOT peg the fuel and BLOW up your new jewel.
Also you need to check timing chain STRETCH and ensure correct fuel delivery timing....ie; the drip method.
 

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Discussion Starter #8
I have heard that there is some vacuum line or slenoid or fitting or something on the california edition that can be removed for more power. Since mine is a calif car, can someone tell me if this exists and how to take it off?
 

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I am familiar with disconnecting and plugging the lines to the passenger side on the 603 engines, but cannot say if the same applies to yours.

I thought you might be interested in this...

http://www.badbenz.com/badbenz/
 

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Hey Need. I understand your frustration. I have been driving benz diesels since i could drive and i still do to this day. I have gone on many forums and asked exactly what you are asking and i can tell you that most people dont recommend modifiying the diesels. These arn't dragsters but they do have some great highway power which redeems it a little. Bottom line is that some mods are simple with high risks and others are expensive and just outweigh the cost of the machine your tuning. I would get it up to spec like someone here suggested, then play with the alda to get a little more oomph but its a car that can last forever if you just leave it how it is. Other options are maybe trying the w124 300d, that is what i have now and it has a big performance and handling jump up from the w123's. My honest suggestion tho is if you want power and you dont want to spend too much then go with a w124 300e, my fiance has a 91' and while my diesel was down i drove hers around and i was able to smoke most of the cars that wanted to play. It is pretty fast believe it or not and you can get a very nice one for very little money. Sorry Bud but getting the diesel to be a threat is just more headaches and money then its worth. I would love to burn those jap car driving asses in a diesel as much as you would but its just not in the cards.
 

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I had a 68 Benz in high school that my uncle had dropped a small-block Chevy 400 and Turbo 400 tranny into. With a 4-barrel intake and carb, it suprised a few people at the stoplights. It was quick.
 

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You did not give the milage on you Car?
Where do you want this speed; in City Traffic or on the Freeway?

Unlike gas cars there is not stuff available to "Bolt on" that gives much of an improvement.

If your car has an Automatic Transmission you could convert it to a Manual Transmission.
Some also swap Differentials to get a different rear end ratio. The ratio is supposed to be stamped on the Differential Housing somewhere.

If your Car has an Emissions Device called a Trap Oxidizer (that has been know to plug up) there is a so called Test Pipe to replace it.
Some also remove the EGR and replace it with a plate.

I do not know if this makes the Car faster but some claim replacing the Mechaincal Engine Fan with an Electric (in addition to the stock one that comes on when the A/C goes on) increases the milage slightly due to using less engine power.
 

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The OM617 in the 123 can be tweaked a little in power output, but if real DIY diesel performance is your goal, I'd opt for an OM603 in a 124, or the OM606 turbo in the 210. The OM606 can be bumped up to around 500hp output, which is one of the reasons I'm currently swapping one into my 124.
 

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If you are looking to go fast for little money go pick up a late 80's early 90's turbocharged Chrysler product. You won't win any prizes for looks but I own a both a 2.5T chrysler Lebaron and a turbo dodge shadow. I bought the shadow for $500 and I have put about $100 worth of junkyard performance parts into it and it ran a 14.3 at the track last year running 14psi with a manual boost controller.
 
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