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#2
11-27-2013, 08:39 PM
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That's interesting...
I am planning to pull the Garrett T3 turbo on my '84 300D, which I rebuilt last winter, in order to install a billet compressor wheel in my search for better spool up. I am torn about wanting to just find and adapt a GT2256V instead of rebuilding the turbo again... but I am reluctant to re-engineer a manifold adapter, oil drain, oil supply, and exhaust downpipe connection in order to connect it up.
Your question and answer got me thinking about the turbine housing. Since the exhaust housing is not a divided double scroll, I doubt that a quick spool valve would help very much. You might be able to speed up the exhaust flow in the area of the valve, but it would be like p***ing into the Grand Canyon as far as speeding up the gasses around the turbine wheel. However, if you look into the intake throat on the turbine housing, you can see that the wastegate chamber splits off of the main intake and virtually bisects the the throat in doing so. When I look at that, I wonder if some sort of flapper valve to block that huge opening at low boost levels might help improve the flow into the turbine. 
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#3
11-28-2013, 01:06 AM
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Hi all!
Wouldn't creating a flapper valve be basically building a vnt turbo out of a non-vnt turbo? I like it, but I suppose just getting a vnt might be easier. I've been wanting to put a vnt on the 240D for a long time, but the right deal (cheep!) on one just hasn't shown up yet! Cheers! Chris
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#5
12-04-2013, 11:08 PM
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Hi there,
What is the deal with vnt controls? I thought the vanes were kept shut until boost built up and then they gradually opened, which sounds pretty simple. Am I wrong? I've been considering putting a vnt turbo on the 240D in place of my t-3, but I have no experiance with them. I'm a machinist and I'm pretty good at creating things, so if you could dispell my ignorance a bit, we might be able to make something work.  Thanks, Chris
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