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Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion > Diesel Performance Tuning

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  #1  
Old 05-04-2015, 08:16 PM
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help with performance upgrades

I have searched for a while now but I can't seem to find what I'm looking for.
I have a 1983 300SD that will make the Mercedes purist hate me, I made the exhaust exit through the hood (sounds pretty cool) Also I have cut the springs to lower the car a few inches. Now for what I would like the car to do..... I have already removed the ALDA but I want the car to blow more black smoke maybe even "roll coal". More power is a plus I'm not too concerned with MPG as the car is now it gets 20 in the city and 25+ of the highway. Something to make the car a little faster off the would be great.
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Old 05-05-2015, 08:35 AM
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You can't do much with a 617 turbo engine,not made for high rev's.Propane would be the easiest power add on. Set for about 6 psi at full throttle.So much cheaper than buying a myna pump.Or replace with better diesel.I saw a cummins in a old Caddy.
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Old 05-05-2015, 08:58 AM
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Quote:
Originally Posted by oldsinner111 View Post
You can't do much with a 617 turbo engine,not made for high rev's.Propane would be the easiest power add on. Set for about 6 psi at full throttle.So much cheaper than buying a myna pump.Or replace with better diesel.I saw a cummins in a old Caddy.
Is there anything I could do to to put fuel in the engine or more boost? Without dumping a ton of money into it.
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Old 05-05-2015, 09:25 AM
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Quote:
Originally Posted by doorjam13 View Post
Is there anything I could do to to put fuel in the engine or more boost? Without dumping a ton of money into it.

You couldn't drive that car in my state with the exhaust coming out of the hood, where do you drive it?
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  #5  
Old 05-05-2015, 09:28 AM
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Originally Posted by strelnik View Post
You couldn't drive that car in my state with the exhaust coming out of the hood, where do you drive it?
I live and drive it in south Texas.... I have not been pulled over..... yet
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  #6  
Old 05-05-2015, 08:24 PM
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Rolling coal is stupid.
Edit: But hood stacks are awesome, so I guess you break even


For more power get your timing fixed(check the chain stretch, get a new tensioner spring, and drip time the IP position)
Adjust valves("free")
check your overflow spring, or replace it ($30)
get your injectors rebuilt with 315 nozzles($150? 200?)
turn up the boost just a little until it doesn't smoke at full speed
get a pyrometer($75)
then we can talk about more mods


The 617 is definitely a high revver for diesels, the governor is set at what, 5500rpm?
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Last edited by Simpler=Better; 05-06-2015 at 09:11 AM.
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Old 05-07-2015, 12:18 AM
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^^what he said
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1982 300D Turbodiesel, daily driver. Mods so far: Fram 8038 paper filter, 4 brake light mod, Gen II w126 (front) rotors/calipers, boost turned up to 12lbs, non-egr manifolds, water/methanol injection, 4-speed manual
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  #8  
Old 05-07-2015, 02:50 PM
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Thanks for the help y'all.
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  #9  
Old 05-07-2015, 06:47 PM
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I'd get a Cummins,you can make huge horsepower.Mercedes diesels are to small.
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Old 05-07-2015, 07:06 PM
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Originally Posted by oldsinner111 View Post
I'd get a Cummins,you can make huge horsepower.Mercedes diesels are to small.
Would a cummins fit in the engine bay? Would you need build a sub frame to handle the power?
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Old 05-07-2015, 07:14 PM
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Quote:
Originally Posted by doorjam13 View Post
Would a cummins fit in the engine bay? Would you need build a sub frame to handle the power?
A straight 4 cylinder Isuzu diesel engine would.

The stack through the hood is awesome on an MB diesel car.
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  #12  
Old 05-07-2015, 07:24 PM
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Originally Posted by doorjam13 View Post
I live and drive it in south Texas.... I have not been pulled over..... yet
Cars and Texas - just go together.

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Last edited by Skid Row Joe; 05-09-2015 at 08:02 PM.
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  #13  
Old 05-07-2015, 09:03 PM
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One more thing-adjust the modulator pressure and shift points o nteh transmission. It just takes time and maybe $30 to slap a pressure gauge together. Shifting at the right points and not slipping will make a huge difference in acceleration.

The list above comes out to like $500(assuming you bu a new timing chain, gaskets, little stuff, etc.) and should put you at somewhere around 140hp/240ft-lbs? Most crappy driver 300Ds are actually running around at 90hp and shift way too soon.

The 617 doesn't make crazy power, but after you get the base list done, you can probably get it higher for another $200 and some time tweaking. No one has dyno sheets but rave about results. You've gotta get the basics done first, or the extras won't help much.
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  #14  
Old 05-08-2015, 10:02 AM
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YouTube the "Evil Doctor Burt" video, I think he advanced the cam a bit with an offset key and also advanced the injection pump timing a bit. Set the valves just a bit tighter so they stay open longer = more air to burn more fuel.

Beyond that and other things mentioned above, you'll need to start modifying the injection pump and the injectors. There is information out there, beware that DIY injection pump modifications run the high risk of putting your pump so far out of calibration that you either have to replace it or send it out for calibration. You might also risk destroying the pump.
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  #15  
Old 05-08-2015, 10:11 AM
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https://www.youtube.com/watch?v=PFhaRefTRUM

This is the video I was talking about.
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'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
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'73 Balboa 20 "Sanctification"
Charleston SC
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