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How do you make a 300d-T go fasTER ? Like, really FAST
guys, simple question: how do you make a w123 300d-t go faster? The exhaust is pretty restrictive, and so is the exhaust manifold. How about some custom headers with a turbo bung, and a completely different kind of turbo? what kinds of aftermarket turbos have people tried, how much boost have they run with them, and what internals needed to be replaced?
this car is like, waaaay too slow for my taste, but i know it has potential |
#2
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Mild performance improvements can be made to a 300D Turbo for reasonable amounts of money and effort. BUT you're not going to make a W123 go really fast without spending a buttload of cash.
For the same money you'll get a lot more of what you're looking for by trading up to a newer model with the 6-cylinder turbo and selling your W123 to someone who appreciates their other fine qualities. Just my 2 cents.
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1984 300 Coupe TurboDiesel Silver blue paint over navy blue interior 2nd owner & 2nd engine in an otherwise 99% original unmolested car ~210k miles on the clock 1986 Ford F250 4x4 Supercab Charcoal & blue two tone paint over burgundy interior Banks turbo, DRW, ZF-5 & SMF conversion 152k on the clock - actual mileage unknown |
#3
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Quote:
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2007 BMW 328XI |
#4
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The stock exhaust is not restrictive at all, it is free flowing. A straight pipe gives a very small performance increase in low end torque because the turbo spools a bit faster, but otherwise no difference. The problem with the 617 is that it is not a cross flow head, and only has 2 valves per cylinder. This makes performance mods pretty much moot for the motor. A better motor to mod is a 603 or 606...they can make serious power. The boost is already as high as it needs to be. With more boost you put more strain on the engine, bearings, head gasket, everything. And there will be no additional power unless you also increase the fuel, which means fancy injection pump tuning and changes ($$$$$)....and if you increase the fuel, it will run too hot at high load and your EGT could become a big problem very quickly....once again limited by the head design. The 617 already has a free flowing air intake and exhaust....changes to that are pointless....and modding the engine would cost a fortune to make any additional power. If you want Speed you bought the wrong car, simple as that. Go buy a 280e if you want speed. Don't ruin a perfectly good 617 with mods that won't work.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#5
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Do a search in the diesel performance section. There is plenty to read about there and you'll get an idea.
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1983 123.133 California - GreaseCar Veg System |
#6
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There is a sub-forum called diesel performance tuning. As you shamelessly don't seem to let things be I'm sure you'll find alot of fun stuff to do there.
Also: http://www.youtube.com/watch?v=czV3fwZ73gc
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1985 500SL Euro w/ AMG bits 130k 1984 300SD Turbodiesel 192k 1980 240D Stick China 188k 2001 CLK55 AMG 101k 2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!! |
#7
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From what I've been able to glean so far, after doing many mods to a w123 617 you will still have slower car than a stock 280E.
An 87 300D has decent performance right out of the box. The w201 190D 2.5 turbodiesels have excelent performance as well. Nice examples are available for between $2 and $3k, which is less that you will have invested in a modified 617, which is still going to be slower. I love the 617 and I'm satisfied with the mediocre performance it provides. It's old tech now, but for the late 70s early 80s, especially in it's 126 chassis iteration, it seemed pretty high tech in it's day.
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1979 240D, 4spd manual, Power Sunroof, manual windows, 147k miles, Pastel gray/Black MB Tex. 1991 300D 2.5 - Smokes like it's on Crack! |
#8
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so, guys. what can i do to get some mild performance gains, without breaking the bank, and without taking apart the engine and messing with pistons?
so far all i've done is delete the egr, and install a K&N air filter. how about an aftermarket air intake? perhaps going with the half-sized oil cooler (for models without A/C, presumably), and using the area above the small cooler for a cold air intake? course this will reduce the oil cooling capacity. or maybe re-route the stock oil cooler (or a larger one) to underneath and behind the bumper? my only other thoughts are light weight CLK wheels, which will only save me a pound or two per corner, which is not bad for a start. i'm willing to entertain any suggestions or links to what others have done (on a budget) |
#9
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RIP: 80 300SD RIP: 79 450SEL 2002 E430 4matic (212,000km) 2002 ML500 'sport' ____________________________ FACEBOOK: PANZER450 |
#10
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Quote:
If you are looking for a sport car's performance then you bought the wrong car.
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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed. W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html 1 X 2006 CDI 1 x 87 300SDL 1 x 87 300D 1 x 87 300TDT wagon 1 x 83 300D 1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry. |
#11
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Quote:
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#12
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hahaha. guys. i knew i should of expected replies like this. no doubt i'm beating a dead horse on this one. i'm not thoroughly convinced about the K&N filter though. I regularly clean, oil and rotate it. but forget about the filter and cold air intake for a sec...
let me re-phrase it this way: if you had $1K to spend, and you wanted to eek out a bit more performance out of this engine, what would you do, specifically? i'm keeping the car essentially stock on the interior, so nothing will be removed to save weight. i already have a 190e which is set up as a track car, i couldn't fathom trying anything like that on a w123 unless it was a beater to begin with |
#13
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buy yourself a nice set of wheels and tires and a smaller diameter steering wheel. new bilstein sport or hd shocks unless you are sure they are not worn out. Absolutely anything else you do you will not be able to feel any difference....not for a grand anyway.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#14
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It sounds like junior, like, needs a, like Honda......
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Jimmy L. '05 Acura TL 6MT 2001 ML430 My Spare Gone: '95 E300 188K "Batmobile" Texas Unfriendly Black '85 300TD 235K "The Wagon" Texas Friendly White '80 240D 154K "China" Scar engine installed '81 300TD 240K "Smash" '80 240D 230K "The Squash" '81 240D 293K"Scar" Rear ended harder than Elton John |
#15
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A highly modified Big Block Chevy under the hood would fill the bill.
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