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  #1  
Old 12-20-2015, 01:54 PM
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Join Date: Jun 2015
Location: Chattanooga TN
Posts: 147
Delete turbo shut off? 83 300d

i really enjoyed the whistle wrrr of the turbo. made me feel i was going fast. Turned out to be an air leak to the turbo shut off...alda?. i plugged it. Now turbo sound was gone. me so sad... i plugged in a old vacuum gauge and turned it into a boost gage were the alda fitting in the intake is. i see boost now. yay! Question one. Will not having turbo shut off to the fuel pump end up killing me second motor like running it out of oil? mike

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Old 12-20-2015, 02:42 PM
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Join Date: Apr 2010
Location: West Quebec
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There is no turbo "shut-off." There is an overboost protection switch that is plumbed into the sensor line before the ALDA, but in practice you would have to be driving like a complete madman to have it engage.

At this age, each of these cars is different in sound and it can vary according to year, in some cases. It is not really 'normal' to have turbo whine, though many or most cars probably do. Not all (based on owner comments in other threads.)

The ALDA (layman's words definition) is an altitude compensator that governs fuel enrichment according to the pressure it senses from the manifold. It can be tweaked to provide fuel a bit quicker on acceleration. Some people who want more performance remove it. I am guessing that is what you are talking about.

For advice and discussion on removal, it is best to look at the diesel performance subforum here, or on the Superturbodiesels forum.

There is a fuel shutoff inside the injection pump, but that has no relation to boost, only to over-revving, and in practice, by the time it would kick in your motor is more than likely done anyway.
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2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

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Old 12-20-2015, 04:38 PM
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Location: Chattanooga TN
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this it my boost gauge and solar power gage
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