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What are the specs on stock turbos in the early 80s
Say a 300D Trubo?

How do they compare to newer aftermarket turbos?

They are Garret T3 or KKK K26. They are a traditional T3.

What are you trying to do?

Turbo map for the T3


Edit: Guess this is for the 50 trim which is in the 300SDL

Attached Thumbnails

 

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

The stock turbo is a 45 trim.

Just wondering how one of these cars would change if a new aftermarket one was put in

You would change how quick boost builds. Thats it.

The T3 is an ancient turbo, designed before WW2. Don't even consider it as a replacement. Look to the newer GT series.

the T3 is that old? wow

now you cant just slap slap any ole turbo on there... nothing is..."bolt up and go"

lots of research.. psssstttt.. I know of a place where putting big turbos on a 617 isnt sacralige

Any specific models in mind? The Holset HX25 I am thinking of using seems quite hard to source. I would like to build boost faster and run no more than 17 or so PSI.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine

The greater efficiency of the turbine and the compressor of newer turbos do up your power some all though its not a lot. The greater efficiencies create the same boost with less back pressure. Once you build enough boost so the waste gate is open there is less parasitic draw on the engine. Before you are up on the waste gate the boost pressures are higher for a given amount of back pressure so you recover more of that energy on the intake stroke of the pistons.

The basic design may date back to WW2 but the compressor wheel and turbine designs date to the 70's and 80's. I agree if your going to shell out big bucks for a turbo go for a GT. I have more computing power on my desk today than all of Garret did in the 70's and 80's. I think the biggest advantage wit a modern GT turbo would be the much broader efficiency islands.

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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png

Yes, but, the 1-3hp you would gain from efficiency alone wouldn't be worth the cost of replacing a good turbo.

How would a little->big bi turbo system work? with Sequential Wastegates and intercooling/cryo?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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FACEBOOK: PANZER450

Lots of electronics.

I can do electronics..what sort of electronics?

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

____________________________
FACEBOOK: PANZER450

I like blinky lights personally.

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

at todays fuel prices it may pay for itself after 5 years.


Bi turbo is obsolete. VNT/VGT has surpassed it in performance and cost. If you want a good electronics project work out a digital control system for one of these. There are a lot of people interested in a VNT/VGT retrofit.

__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png