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Old 01-14-2016, 11:31 AM   #1
BayleeWatson07

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85 mercedes 300d performance questions

I just picked up a 85 mercedes td, and I think it'd be neat to give it a little more power. I know the obvious stuff like turning the fuel up at the injection pump. My question is, I there a bigger turbo that will bolt up to my stock manifold? Is there somewhere that I can get some bigger injectors? Not looking to build a race car, but looking for a little power.
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Old 01-14-2016, 05:48 PM   #2
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I had a 5 cyl engine out of one of those I swapped in a ranger, goggle rack limiter eliminator where you actually remove a piece in the pump. That and delete the egr system, I cut the accordion pipe ad used a conduit knock out to put in there. Those really made it wake up in terms of power. The auto Trans is kinda crappy. I was running an adapter plate and a ax15 and it was kinda peppy. I had did a lot of digging somewhere and found a guy importing injector nozzles from Germany that were bigger. I bought a set and put them in but didn't notice much of a difference. I don't know about a turbo that will work as far as an upgrade, I crimped wastegate closed and was making 25-30psi
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Old 01-14-2016, 08:15 PM   #3
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There is a 300sd for sale near me and I'm interested in the same info.

Do the stock trans have lockup converters and overdrive? Is there an easy swap?
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Old 01-15-2016, 04:26 AM   #4
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Check out this site to have all your questions answered.

http://superturbodiesel.com/

They range from mild to wild sorta like compd!
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Old 02-03-2016, 03:37 PM   #5
mfsuper90
 
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I got an om617 with a A/W intercooler, hx30 charger, 315 injectors and turned up stock IP. It doesn't do too bad. Did 125hp to the wheels at 18psi on the dyno. I tweaked the IP more since then, it might be 130 at the wheels now lol.
It has the capability of decent power, but you HAVE to spend the money and put a big injection pump on it. I'd say my car could make around 200hp pretty easy with a big IP. But I'm going to switch over to a 603 instead
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’82 300D benz Bosch MW turned up, HX30, W/A Intercooler
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Old 04-14-2016, 03:06 PM   #6
OM617.95

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Quote:
Originally Posted by mfsuper90 View Post
Did 125hp to the wheels at 18psi on the dyno.
Your power is low because you have way too much boost.

You can learn about proper adjustment here.

Quote:
Originally Posted by superdutyfarmer View Post
I crimped wastegate closed and was making 25-30psi
Thats not a smart thing to do. NEVER obstruct a wastegate hose!
Excessive boost REDUCES power!

Last edited by OM617.95; 04-14-2016 at 03:07 PM.
 
Old 04-14-2016, 03:10 PM   #7
mfsuper90
 
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Only if there is excessive back pressure. Even at 18psi you can still see the faintest hint of smoke, but I'm attributing that to the long injection duration.
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’82 300D benz Bosch MW turned up, HX30, W/A Intercooler
MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
Old 04-14-2016, 03:17 PM   #8
OM617.95

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Quote:
Originally Posted by mfsuper90 View Post
Only if there is excessive back pressure.
That is completely false.

Quote:
Even at 18psi you can still see the faintest hint of smoke, but I'm attributing that to the long injection duration.
Poor tuning. Advance your timing to 27* and reduce boost to 14psi.
 
Old 04-14-2016, 03:37 PM   #9
mfsuper90
 
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FI is back at it again
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’82 300D benz Bosch MW turned up, HX30, W/A Intercooler
MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
Old 04-15-2016, 06:26 AM   #10
oldestof11
 
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Is that 300D again?
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Old 04-15-2016, 08:11 AM   #11
mfsuper90
 
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Is that 300D again?
You bet
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’82 300D benz Bosch MW turned up, HX30, W/A Intercooler
MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
Old 04-16-2016, 10:29 AM   #12
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I sold one to Rip Rook at Source Automotive several years ago. He drag raced it stock and posted some video somewhere. Pretty funny stuff. I think the car in the other lane was back to the start line before the Mercedes made it to the end of the track.
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Old 04-17-2016, 11:08 AM   #13
mfsuper90
 
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Definitely not gonna win very many races in stock form, but they are fun to play with and have as a commuter

Mine tips the scales at ~3600lbs, and they got 125hp at the crank factory. 1/4 mile calculater says it'll do 18.8 in stock form
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’82 300D benz Bosch MW turned up, HX30, W/A Intercooler
MF Super 90 various odds and ends done. Farm stocker
MF 98 3-71 screaming jimmy. Needs N90's. Another farm stock
'14 Ram Anarchy EFI, G56
 
Old 04-17-2016, 11:20 AM   #14
99GreenCummins
 
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Quote:
Originally Posted by mfsuper90 View Post
Definitely not gonna win very many races in stock form, but they are fun to play with and have as a commuter

Mine tips the scales at ~3600lbs, and they got 125hp at the crank factory. 1/4 mile calculater says it'll do 18.8 in stock form
If it's consistent though, bracket racer from hell.
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