Minor Modification Best Longevity
Minor Modification Best Longevity
10-18-2010, 10:36 PM
#1
This is in a 1980 300CD want to do minor cheap modifications to boost power to 150-200HP, but on the down side I am looking for the best fuel economy, really I'm looking for 35MPG or better.
Here is what has been done:
1. EGR system removed.
2. Turbo Overspeed device in turbo removed and Blocked off.
3. 3" straight exhaust In the works (no mufflers)
4. Any Suggestions
I wont lie I'm broke but am a diesel mechanic just not a MB diesel mechanic, so any help would be appreciated. If you have photos much easier for me to know what your talking about too.
08 Ram Cummins 6.7 Mega Cab 4wd Beauty & Towing Mods, 97 Ram Cummins 5.9 Extended Cab 4wd. Engine, Tansmission, and Funtional Mods, 90 Suburban 4wd Stock, 83 300D Pats Car, 80 300CD in Restoration and Fabrication Process( was non turbo...now Turbo
) 75 Ramcharger 4wd Someday Cummins Power Project
Oil Burner
10-18-2010, 10:36 PM #1Doing a Engine swap. 80 non turbo out...85 turbo in
This is in a 1980 300CD want to do minor cheap modifications to boost power to 150-200HP, but on the down side I am looking for the best fuel economy, really I'm looking for 35MPG or better.
Here is what has been done:
1. EGR system removed.
2. Turbo Overspeed device in turbo removed and Blocked off.
3. 3" straight exhaust In the works (no mufflers)
4. Any Suggestions
I wont lie I'm broke but am a diesel mechanic just not a MB diesel mechanic, so any help would be appreciated. If you have photos much easier for me to know what your talking about too.
08 Ram Cummins 6.7 Mega Cab 4wd Beauty & Towing Mods, 97 Ram Cummins 5.9 Extended Cab 4wd. Engine, Tansmission, and Funtional Mods, 90 Suburban 4wd Stock, 83 300D Pats Car, 80 300CD in Restoration and Fabrication Process( was non turbo...now Turbo
) 75 Ramcharger 4wd Someday Cummins Power Project
10-19-2010, 05:18 AM
#2
For MPG, 35 is at the top of the range of what I've seen. Adding a little advance to the pump may help as well as other non-engine related things like cutting a coil off the springs to lower the car a little for better aerodynamics and swapping out the rear end for a taller one.
1998 MB E300 - 194,000 miles. Current/future mods: 7.5mm pump elements, Holset HX40 Turbo feeding Eaton M90 supercharger through custom fabbed intake system. Aeroturbine muffler, scratch-built 4" stainless exhaust. EGR eliminated, ECM recalibrated, modified rack position feedback circuit. Porterfield RS brake pads, Bilstein sport shocks, VDO EGT, oil and boost gauges.
2000 Ford F250 - 150,000 miles. Current/future mods: DP Tuner 3 map chip, scratch-built high flow intake, high output IDM, open circuit fuel system, ball bearing turbo, South Bend full metal clutch, slotted and drilled rotors. Autometer Sport Comp EGT and boost gauges.
That's a tall order. These cars don't have the reserve in the pump that your Cummins has for additional HP just through adjustments. I believe the stock pump is only good for about 140+ HP without going to larger elements.
For MPG, 35 is at the top of the range of what I've seen. Adding a little advance to the pump may help as well as other non-engine related things like cutting a coil off the springs to lower the car a little for better aerodynamics and swapping out the rear end for a taller one.
1998 MB E300 - 194,000 miles. Current/future mods: 7.5mm pump elements, Holset HX40 Turbo feeding Eaton M90 supercharger through custom fabbed intake system. Aeroturbine muffler, scratch-built 4" stainless exhaust. EGR eliminated, ECM recalibrated, modified rack position feedback circuit. Porterfield RS brake pads, Bilstein sport shocks, VDO EGT, oil and boost gauges.
2000 Ford F250 - 150,000 miles. Current/future mods: DP Tuner 3 map chip, scratch-built high flow intake, high output IDM, open circuit fuel system, ball bearing turbo, South Bend full metal clutch, slotted and drilled rotors. Autometer Sport Comp EGT and boost gauges.
10-19-2010, 07:16 AM
#3
(10-18-2010, 10:36 PM)Oil Burner want to do minor cheap modifications to boost power to 150-200HPThere are none. At minimum you're looking at $1000 for a modified injection pump to break the 150hp mark.
Quote:really I'm looking for 35MPG or better.The only time you'll see that is driving 45mph on straight level highway. The rest of the time you'll be lucky to break 25mpg IF you drive it easy. If you use 200hp on a regular basis you'll never break 22mpg.
Quote:2. Turbo Overspeed device in turbo removed and Blocked off.Bad option. Until you get a high output injection pump there is no need for more than 15psi so disabling such a safety device has no benefit at all.
This post was last modified: 10-19-2010, 07:17 AM by ForcedInduction.
ForcedInduction
10-19-2010, 07:16 AM
#3
(10-18-2010, 10:36 PM)Oil Burner want to do minor cheap modifications to boost power to 150-200HPThere are none. At minimum you're looking at $1000 for a modified injection pump to break the 150hp mark.
Quote:really I'm looking for 35MPG or better.The only time you'll see that is driving 45mph on straight level highway. The rest of the time you'll be lucky to break 25mpg IF you drive it easy. If you use 200hp on a regular basis you'll never break 22mpg.
Quote:2. Turbo Overspeed device in turbo removed and Blocked off.Bad option. Until you get a high output injection pump there is no need for more than 15psi so disabling such a safety device has no benefit at all.
10-19-2010, 08:41 AM
#4
Thanks for the advice so far.
If I were to remove the Injection pump what mods would I want to do to it and what are good injectors to go with these kind of mods? Remeber longevity is the goal but some HP increase is badly needed after driving the cummins trucks
08 Ram Cummins 6.7 Mega Cab 4wd Beauty & Towing Mods, 97 Ram Cummins 5.9 Extended Cab 4wd. Engine, Tansmission, and Funtional Mods, 90 Suburban 4wd Stock, 83 300D Pats Car, 80 300CD in Restoration and Fabrication Process( was non turbo...now Turbo
) 75 Ramcharger 4wd Someday Cummins Power Project
Oil Burner
10-19-2010, 08:41 AM #4I used to get 35 out of my 85 300TD no modifications other than Straight exhaust...I live in flat land for the most part.
Thanks for the advice so far.
If I were to remove the Injection pump what mods would I want to do to it and what are good injectors to go with these kind of mods? Remeber longevity is the goal but some HP increase is badly needed after driving the cummins trucks
08 Ram Cummins 6.7 Mega Cab 4wd Beauty & Towing Mods, 97 Ram Cummins 5.9 Extended Cab 4wd. Engine, Tansmission, and Funtional Mods, 90 Suburban 4wd Stock, 83 300D Pats Car, 80 300CD in Restoration and Fabrication Process( was non turbo...now Turbo
) 75 Ramcharger 4wd Someday Cummins Power Project
10-19-2010, 09:10 AM
#5
(10-19-2010, 08:41 AM)Oil Burner I used to get 35 out of my 85 300TD no modifications other than Straight exhaust...I live in flat land for the most part.I pretty much know you didn't. Its not physically possible due to poor thermodynamics and non-locking torque converter. The stock mufflers are not a restriction. Most likely there was a mechanical error like a blocked tank vent variably altering fill capacity, the wrong speedo from an 82-84 model that had a 3.07 rear end instead of 2.88, larger than stock tires, etc etc.
Even a 240D is lucky to get low 30s if driven nicely.
The only way you'll get 35mpg consistently with an easy 200hp is to get an 87 190D 2.5turbo. If you're set on a wagon the 87 300TD would be able to nearly touch 35mpg while supporting 300hp.
No OM617 powered vehicle will be able to average 35mpg outside of straight low-speed highway cruising.
This post was last modified: 10-19-2010, 09:14 AM by ForcedInduction.
ForcedInduction
10-19-2010, 09:10 AM
#5
(10-19-2010, 08:41 AM)Oil Burner I used to get 35 out of my 85 300TD no modifications other than Straight exhaust...I live in flat land for the most part.I pretty much know you didn't. Its not physically possible due to poor thermodynamics and non-locking torque converter. The stock mufflers are not a restriction. Most likely there was a mechanical error like a blocked tank vent variably altering fill capacity, the wrong speedo from an 82-84 model that had a 3.07 rear end instead of 2.88, larger than stock tires, etc etc.
Even a 240D is lucky to get low 30s if driven nicely.
The only way you'll get 35mpg consistently with an easy 200hp is to get an 87 190D 2.5turbo. If you're set on a wagon the 87 300TD would be able to nearly touch 35mpg while supporting 300hp.
No OM617 powered vehicle will be able to average 35mpg outside of straight low-speed highway cruising.
10-19-2010, 09:33 AM
#6
1987 300SDL 6spd manual om606.962 swap project
1985 300td euro 5spd wagon running
willbhere4u
10-19-2010, 09:33 AM #6My 240d turbo struggles to hit 29-30 mpg with a 4spd manual trans doing anything over 65mph!
1987 300SDL 6spd manual om606.962 swap project
1985 300td euro 5spd wagon running
10-19-2010, 10:12 AM
#7
(10-19-2010, 09:10 AM)ForcedInduction(10-19-2010, 08:41 AM)Oil Burner I used to get 35 out of my 85 300TD no modifications other than Straight exhaust...I live in flat land for the most part.I pretty much know you didn't. Its not physically possible due to poor thermodynamics and non-locking torque converter. The stock mufflers are not a restriction. Most likely there was a mechanical error like a blocked tank vent variably altering fill capacity, the wrong speedo from an 82-84 model that had a 3.07 rear end instead of 2.88, larger than stock tires, etc etc.
Even a 240D is lucky to get low 30s if driven nicely.
The only way you'll get 35mpg consistently with an easy 200hp is to get an 87 190D 2.5turbo. If you're set on a wagon the 87 300TD would be able to nearly touch 35mpg while supporting 300hp.
No OM617 powered vehicle will be able to average 35mpg outside of straight low-speed highway cruising.
Here is another theoretical question for you then... Add intercooler to engine, and if anyone knows switch to a 5sp Manual with OD. Has anyone done this and what is the difficulty? What is a good match up for this too Manufacture for trans? Would this increase MPG the intercooler should assist in HP too
08 Ram Cummins 6.7 Mega Cab 4wd Beauty & Towing Mods, 97 Ram Cummins 5.9 Extended Cab 4wd. Engine, Tansmission, and Funtional Mods, 90 Suburban 4wd Stock, 83 300D Pats Car, 80 300CD in Restoration and Fabrication Process( was non turbo...now Turbo
) 75 Ramcharger 4wd Someday Cummins Power Project
Oil Burner
10-19-2010, 10:12 AM #7(10-19-2010, 09:10 AM)ForcedInduction(10-19-2010, 08:41 AM)Oil Burner I used to get 35 out of my 85 300TD no modifications other than Straight exhaust...I live in flat land for the most part.I pretty much know you didn't. Its not physically possible due to poor thermodynamics and non-locking torque converter. The stock mufflers are not a restriction. Most likely there was a mechanical error like a blocked tank vent variably altering fill capacity, the wrong speedo from an 82-84 model that had a 3.07 rear end instead of 2.88, larger than stock tires, etc etc.
Even a 240D is lucky to get low 30s if driven nicely.
The only way you'll get 35mpg consistently with an easy 200hp is to get an 87 190D 2.5turbo. If you're set on a wagon the 87 300TD would be able to nearly touch 35mpg while supporting 300hp.
No OM617 powered vehicle will be able to average 35mpg outside of straight low-speed highway cruising.
Here is another theoretical question for you then... Add intercooler to engine, and if anyone knows switch to a 5sp Manual with OD. Has anyone done this and what is the difficulty? What is a good match up for this too Manufacture for trans? Would this increase MPG the intercooler should assist in HP too
08 Ram Cummins 6.7 Mega Cab 4wd Beauty & Towing Mods, 97 Ram Cummins 5.9 Extended Cab 4wd. Engine, Tansmission, and Funtional Mods, 90 Suburban 4wd Stock, 83 300D Pats Car, 80 300CD in Restoration and Fabrication Process( was non turbo...now Turbo
) 75 Ramcharger 4wd Someday Cummins Power Project
10-19-2010, 08:06 PM
#8
(10-19-2010, 10:12 AM)Oil Burner Add intercooler to engineAn intercooler doesn't change anything except allowing more fuel to be injected safely.
Quote:and if anyone knows switch to a 5sp Manual with OD. Has anyone done this and what is the difficulty?Finding one. I've only ever seen two in person in the last 8 years, one was in a cherry 280CE and the other was trashed from water contamination.
ForcedInduction
10-19-2010, 08:06 PM
#8
(10-19-2010, 10:12 AM)Oil Burner Add intercooler to engineAn intercooler doesn't change anything except allowing more fuel to be injected safely.
Quote:and if anyone knows switch to a 5sp Manual with OD. Has anyone done this and what is the difficulty?Finding one. I've only ever seen two in person in the last 8 years, one was in a cherry 280CE and the other was trashed from water contamination.
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