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  #1  
Old 06-05-2006, 12:59 PM
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Location: Arizona
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Dangerous in traffic? Jeez this thing is slow!!

Does anyone else feel like they are a road hazard in their diesel Mercedes? I've been honked at 3-4 times already and I have the pedal to the floor everywhere I go as a desperate attempt to get up to speed. I feel bad flooring it so much but crikey this thing needs a little more go. It's an 83 300DT with 156k miles, meticulously maintained.

The funny thing is... the owner I got the car from said proudly it's the fastest one he's ever driven. He's had over 20 W123/W126 vehicles so I assume he knows what he's talking about.

How do these cars react to modifications? I've done a little research and found that the IP can be adjusted along with increasing the turbo boost... but how safe is this? I've been tuning turbo gas vehicles for a long time now but am a total newbie to the diesel world

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  #2  
Old 06-05-2006, 01:18 PM
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Change all the fluids, filters. Adjust the valves, check for chain stretch while your doing the valves.
Clean out the banjo fitting on the back side of the intake manifold. Make sure this line is clear to the IP.
Tweek the ALDA if its still too slow for you.

Do a search here. Lots of good info.
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  #3  
Old 06-05-2006, 01:49 PM
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Yeah, I would say your car has problems

I have 200# on you, and I easilly see 85mph on highways. of course most don't belive me on the speed of my 126 car. if you are having problmes getting up to speed or maintaining speed, there is a problem with your airfilter, turbo, or alda fuel boost valve.
fuel filter can also cause the problems you describe.
go to dieselgiant.com and look at the mercedes repair sections good place to start.
John
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  #4  
Old 06-05-2006, 01:52 PM
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The turbodiesels seem to have plety of power to get into traffic. I had issues with the N/A diesels, but I live in Denver.
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  #5  
Old 06-05-2006, 02:03 PM
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eh, the mechanic says there is nothing wrong with it. It does 0-60 in just under 12 seconds according to the ghetto stopwatch method. Once it's up to speed it's really nice... it's just off the line power that is a bit lacking. I could fall asleep in the time it takes to get from 0-30 mph.

I guess I'm just spoiled in the fact that my other car gets to 60 almost 3x faster

I'll need to change my driving style, wait for larger openings in traffic, etc. I did a search for ALDA and came up with a ton of stuff... does anyone have a direct link on how to tweak it for slightly more power?

Thanks guys
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  #6  
Old 06-05-2006, 02:04 PM
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I would time my 0-60 and compare it against posted averages. Would perhaps give you some insite or at least let you know when you have normal speed back again. Edit: I got beat by a the last post it seems. Still might be wise to check your 0-30 or an alda tweek does help a little I have heard.
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  #7  
Old 06-05-2006, 02:44 PM
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My '82 300D was a dog for years. I just thought that's the way a diesel was supposed to be. Cleaning out the switchover valve line resulted in a significant improvement. A quarter turn on the ALDA really helped initial acceleration. Adjusting the valves helped a little. Also, my injection timing was quite retarded. Adjusting the timing helped a little, but the primary affect is that the engine now starts almost immediately. Adjusting the governor idle pin got rid of the "shakes."

The bottom line is that my "dog" now runs like a sewing machine and performs like a sports car. Well, almost like a sports car. I don't feel like I have to say a prayer before merging into traffic any more.
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  #8  
Old 06-05-2006, 02:59 PM
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Thumbs up

Try crankin the ALDA up and make sure throttle linkage is correct.
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  #9  
Old 06-05-2006, 07:31 PM
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dont ever worry about flooring it.

they are made to be driven that way. absolutely no danger to the car.

also be sure to count and see if you are using all four gears. sometimes they will take off in second and then it is blankey and pillow time as you have time to take a nap while it is spooling up.

tom w
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  #10  
Old 06-05-2006, 07:43 PM
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Quote:
Originally Posted by t walgamuth
dont ever worry about flooring it.

they are made to be driven that way. absolutely no danger to the car.

also be sure to count and see if you are using all four gears. sometimes they will take off in second and then it is blankey and pillow time as you have time to take a nap while it is spooling up.

tom w
Thanks for the information It's just a bit unnerving to have the pedal on the floor all the time. I'd be headed to jail if I did that in either of my other vehicles
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  #11  
Old 06-05-2006, 08:36 PM
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You could also do other things like propane fumigation, install electric cooling fan(s), run a 'premium' diesel fuel, and run synthetic oil.

I think a cumulative effect works best.
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  #12  
Old 06-05-2006, 09:09 PM
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The last time I was in Tucson the speed limit was 35 on most streets!!! If the car cannot get out in traffic at that speed I would have to say that you do have a problem. I am currently driving a 300D Euro and have no problem from the traffic light or merging onto the highway. But as others have suggested replace the all of the filters.
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  #13  
Old 06-05-2006, 09:12 PM
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think that is slow, try driving a 240D heh, well anyways, if anyone gets on my but or anything, i just floor is and watch a big cloud of smoke come out, then they always change lanes.... never fails
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  #14  
Old 06-05-2006, 09:16 PM
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Tweaking the ALDA should cure any 0-30 problems you might have short of sloppy throttle linkage.

check your linkage to make sure it's contacting the full stop screw. Have an assistant hold the throttle all the way to the floor (With the engine off) and see that it touches the bolt. See the picture for the bolt I'm talking about.
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  #15  
Old 06-05-2006, 09:17 PM
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If you are having trouble driving a 12 second 0-60 car in AZ "traffic" it isn't the car thats the problem...

My SD is slower and I have never had a problem driving it in heavy traffic. Like steep I-95 on ramps where you merge or die at the top.

I find about 2k rpm is enough out of the SD for daily use. Same with the SDL since the ALDA has been adjusted.

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