i really want to install a vnt turbo on my 1984 300sd. has anyone come up with a better way to control it than just picking boost stages. also, how is it controlled? does a tps change the ohms level being sent to the controller? if so couldn't we just use rig something up based off the throttle linkage?

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84 300sd 2.47 dif 360k
26 mpg needs lots of love
given to me in pitty

89 civic hatchback auto 140k
33mpgs soon to be low to mid 40's
been in the family since mile 1

85 300d with unknown knock. driven over 30k with knock and still going. sold for $800

Are you willing to provide links to the info concerning how this turbo is controlled?

Is there a problem with your current set up, or would simply like more efficiency?

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83 SD

84 CD

You might look over on the Super Turbo Diesel Forum.

I barely understand it but the picture of the Valve that I saw it is a Butterfly type Valve (not unlike a Choke) with an exterior arm on it. The Valve was mounted in seperate Palate between the Exhaust Manifold and the Turbo.

Since all I saw was the Valve itself you would need to fabricate something that is going to hold that Valve partially closed for lower rpms and then as the Boost Pressure rises that peressure needs to actuate something to open the Valve all the way.

Think of the Valve as sort of a reverse of the Waste Gate. It is partially closed at zero or low manifold pressures and gradually opens as the Manifold pressure rises.

If it is a Turbo that has the Valve Built in it might already have the setup and you and all you need to do is hook the Part that controls the Valve to the Intake Manifold. On mine there is an extra Port that is plugged with a Bolt at the Rear or the Intake Manofold.

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84 300D, 82 Volvo 244Gl Diesel

[QUOTE=toomany MBZ;3404837]Are you willing to provide links to the info concerning how this turbo is controlled?

On My Turbo it does not seem like the Boost effects much until about 2000rpms. So there is I am going to say no boost at lower rpms and no extra power as there is no extra Fuel due to no boost.

By restricting the Exhaust Gas flow with the partially closed Valve between the Turbo and the Exhaust Manifold you increase the Velocity of the Exhaust Gasses and that turns the Turbo at lower Engine rpms and you get boost at lower Engine rpms.
Some what like the effect when you put your Thumb partly a crossed the end of a Water Hose.

On purpose made VTN Turbos the Valve actually directs the Exhaust Gasses at a specific area on the Exhaust Turbine.
The generic add on Valves may not do that.

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84 300D, 82 Volvo 244Gl Diesel

There ya go, I understand no boost below ~2300 rpm as stock, so restricting the EG flow below stock may tell the ALDA and turbo to do their thing earlier.

I agree with asking a different web site.

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83 SD

84 CD

Not exactly. The Valve increases the Velocity of the exhaust gasses that that Velocity turns the Turbine faster and that faster Turbine speed turns the Compressor wheel that creats boost pressure sooner then it would without the restrictive Valve and the boost pressure acts on that ALDA and the ALDA allows more Fuel to match the boost pressure.

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84 300D, 82 Volvo 244Gl Diesel

I see, thanks for the clarification.

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83 SD

84 CD

I believe what your describing is a twin scroll turbo. I don't think you can just use one of those splitting valves on a regular turbo. I seem to remember a discussion on this over at STD

As for controlling it superturbodiesel.com is your best bet. I know they were working on controlling them electronically but I'm not sure if it ever amounted to anything. They also have diagrams on how to plumb it up mechanically with boost stages as you previously mentioned.

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2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold

I looked over on ebay and they sell the VTN Actuators for the Stock (non-mercedes) Turbos that use them.

I thought I had saved the Picture of the add on VTN Valve but was unable to find it.
Picture your Tubo Gasket made out of 1/2" plate. Then picture that you drilled a 1/4" hole lengthwise down the Middle and you slid a Rod through thos holes.
The on the Rod you mounted a rectangular piece of Sheet Metal with Rounded Corners to the Rod.
Out side mouted to one end of the Rod was an Arm/Lever to attach the Actuator to.
The VTN Valve I was speaking of was not made for any special Turbl just one that used the same size as your Turbo Gasket.

The Generic VTN Valve Should work but not to the same degree as a purposed designed Turbo and VTN Vavle System

When I looked at the Pic of the Generic VTN Valve I thought that it was very fragile. The Sheetmetal Vane and the Rod that the Vane pivots on would have to be made of some Metal that can with stand the heat and on top of that it is likely that where the Rod goes through the Plate is going to get stickly due to Carbon Buildup and or Rust.

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84 300D, 82 Volvo 244Gl Diesel

Check superturbodiesel.com, there's a few neat setups over there guys have come up with

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1982 300D Turbodiesel, daily driver. Mods so far: Fram 8038 paper filter, 4 brake light mod, Gen II w126 (front) rotors/calipers, boost turned up to 12lbs, non-egr manifolds, water/methanol injection, 4-speed manual
1980 300SD Turbodiesel, project car, nearly ready to hit the street

1974 240D, New paint