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#1
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Improving low end power of 617
So my dad's had a 240D for years and now we're making the car he always wanted, a 300D Turbo with a manual transmission. Engine is now in the car but we are having to sort out the turbo as none of the multiple spares I have are rebuildable. One thing my dad is worried about is low end power. He didn't like the turbo lag in his friend's 87 300TD and wants to figure out if we can do something about that for this car.
What options do we have? We've thought about putting in a Sprinter turbo but don't really know how exactly that would be accomplished. Are there simpler solutions? We're not trying to make the engine significantly more powerful, just want better low end.
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
#2
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The flanges are different between the turbo of a sprinter and a om617. That's easy enough to make and fabricate with some welding and cutting to fit.
To decrease turbo lag, you would want a small turbo housing. Larger housing increases lag. If you want more power, intercool it, larger turbo, exhaust and tune the pump. The om603 does not have a lot of turbo lag. Something had to be wrong with that car. Mine hauls a$$ for what it is.
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Only diesels in this driveway. ![]() 2005 E320 CDI 243k Black/Black 2008 Chevy 3500HD Duramax 340k 2004 Chevy 2500HD Duramax 220k |
#3
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Quote:
There's a person on eBay selling a flange adaptor for a T3 to Sprinter turbo so that bit isn't hard to figure out, it's the intercooler piping and air filter housing.
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
#4
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You can always delete the ALDA and not have to worry about the reduced fueling at low RPM/boost.
A turbocharged diesel is one application where an automatic transmission is superior to a manual - it allows the turbo to stay spooled between gear changes.
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Current stable: 1995 E320 157K (Nancy) 1983 500SL 125K (SLoL) Gone but not forgotten: 1986 300SDL (RIP) 1991 350SD 1991 560SEL 1990 560SEL 1986 500SEL Euro (Rusted to nothing at 47K!) Gone and wanting to forget: 1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz] |
#5
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If I had a straight drive and wanted a hole shot I'd spool it up before I dumped the clutch. Not really, I rev it then let the clutch our easy to get it rolling properly.
It seems like a 617 would launching a 123 body.
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84 300SD 85 380SE 83 528e 95 318ic |
#6
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It's probably better to adjust the ALDA or change rear end ratios, but a great opportunity to get a more modern turbo in there. Let's face it, the old T3-45s are crap...
Something with a smaller turbine housing will spool faster but you don't want to choke your top end. Something like a Holset HE200WG (only bring that up because I have one) would be alright since you're not going for more pwoer really (although it's compressor will flow more). Need a T3 to T25 adaptor for one of those though. Still many other options out there as well. Just remember intercoolers etc will add to the lag slightly...
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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making.... 1977 280> 300D - 500,000km+ (to be sold...) 1984 240TD>300TD 121,000 miles, *gone* 1977 250 parts car 1988 Toyota Corona 2.0D *gone* 1975 FJ45>HJ45 1981 200>240D (to be sold...) 1999 Hyundai Lantra 1.6 *gone* 1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist) 2001 Holden Rodeo 4JB1T 2WD ![]() |
#7
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A friend that drives Datsun Z turbos complains that no one has problems with NA lag. He swears that people drive and don't rev the motor to the proper level.
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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do. |
#8
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Twin scrwoll but that's expensive.
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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily 1992 Mercedes 300D 2.5 202,000 - Pure junk 2000 Mercedes E320 Black - 136,000 miles - Needs repair Don't forget to grease the screw and threads on the spring compressor. |
#9
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How about a tune up and properly rebuilt turbo? No one would have paid what these things cost new if there was turbo lag.
Sixto 98 E320s sedan and wagon |
#10
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We're putting in the 240D rear end. Engine is a factory rebuilt unit we pulled out of a wagon in the yard, tested nearly 400psi on all cylinders. We put in rebuilt injectors that we tested for consistent spray pattern. Fresh valve adjustment. I might just reseal this K26 we've got laying around then my dad can decide whether or not he wants us to upgrade the turbo.
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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon. |
#11
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Are you saying the 617 with laggy turbo doesn't pull better from a stop than the 616? I'm surprised you feel turbo lag with 3.88 gears. The best part of such a swap might be longer legs like a 3.07 unless you don't do much long distance cruising.
Sixto 98 E320s sedan and wagon |
#12
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I had no problem with mine,I turned up boost by using a gas valve between the little hose on the turbo, then removed ALDA.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt |
#13
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I'd say keep all stock but make darn sure the turbo is healthy (building 14 psi at WOT at 2400 RPM) and the ALDA is not leaking pressure (new o-rings). You'll probably be happier if you get a rebuilt IP with new ALDA, much simpler than trying to source / engineer a different turbo that will fix the low end.
Also note that these engines are much higher revving than what most 'Mericuns are used to, one must keep the engine at a higher speed to get all the torque and power. A manual trans will facilitate that. I vote against the "ALDA delete" recommendation, that may be effective as a trouble shooting method but in the long run I would think it bad for the engine (excessive carbon buildup from excessive fuel that doesn't burn completely). I would also expect that fuel consumption would increase.
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Respectfully, /s/ M. Dillon '87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted '95 124.131 (E300) "Sapphire", 380k miles '73 Balboa 20 "Sanctification" Charleston SC |
#14
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Quote:
Let 'er spin.
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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap |
#15
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If you really want boost get a variable vane from a sprinter or jeep.
With a 2056v I could build boost revving in neutral. When driving I could get pretty much instant boost, it made a huge difference.
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
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