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Originally Posted by CoyoteStarfish
W123/OM617 modification questions (Intercooler/Myna/VNT/Lighting & cosmetics/Etc.)
INTERCOOLER: Obviously - turbocharged, so next step is to intercool, right? What are some of your experiences intercooling a 617? What kind of HP gains can be made by this swap?.
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No power from just the intercooler, but it will decreace your exhaust temps to allow you to turn up the fuel for more power.
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MYNA DIESEL: I've read bits and pieces about those Finnish modded pumps unlocking the potential of these Mercedes diesel engines.. but really, what is the hype? What is so special about what they do to these pumps half a world away?
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They take a Euro "M" pump, add 7 mm (I think) elements to flow more fuel, and external adjustment to allow easy tuning while the pump is on the car. The US turbo cars have the "MW" pump which has not had as much work done on tweaking it.
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VARIABLE GEOMETRY TURBO: I've seen a few posts about these VNTs and VGTs mounted onto the 617, but sifting through the "how cool" and "I want!" posts made me dizzy, what is the verdict with this new(er) technology added to these classic automobiles? What - if any - HP was gained? Or was it all shaving ET's?
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Again, no more power over stock with out more fuel, but a VGT will give much faster spool times and increase effiency which lowers EGTs allowing room to turn up the fuel.
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LIGHTING: I'm interesting in hearing about lighting modifications from other members, mainly HID / projector / LED upgrades. I'm looking to modernize my 300D slightly - as far as cosmetics go.
My big lighting question is: are there any aftermarket replacements for those darn fog lights?
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The best upgrade for lighting is to get a set of Euro headlights. They replace the US sealed beams with H4 bulbs. They provide better light and look better (IMO) than the US lights with the plastic surrounds. There are two types, the round type which look similar to the US headlight, but with an all glass front (and better light production), and the square type, which give the car a more modern look.
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-Has anyone fabbed up an oil catch can for factory air cleaner deletes? Pictures?
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Many people have used a 240D or aftermarket external oil seperator. No need for a catch can, there is a drain for an oil seperator in the upper oil pan from the factory.
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-AAZ injectors? Can't remember where I read about them, but I was interested. Info?
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ForcedInduction and a few others have used them. They are a two stage design that give a small "piolet" injection for more efficient and quiet opperation.
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-Does a 5 speed manual transmission mate up to the 617?
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Yes, but they are extremly hard to find
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-What is a typical rear end ratio for this vehicle and are there replacements/alternatives? The high RPM's at higher speeds seem ridiculous and also seems like you could get better MPG's with a smaller number.
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240D: 3.69
300D (non-turbo):3.46
300D (turbo): 3.07
300D ('85 only): 2.88
You can also find a 2.46 from a gasser. I would not go any lower than 3.07 with a manual.
Edit: looks like Lance beat me to the punch.
