What is this part ? The white one in the middle....

thank you

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Audi TT

Not sure of the "correct" name but I call it the tranny vacuum signal controller. The line coming out the side should be vented to atmosphere.

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Jim

And it would be a little better if that line to atmosphere terminated in the passenger compartment under the dash, where it's cleaner. It provides increasing leak in proportion to throttle position. The little canister connected to the top via a hose is a damper.

Am I mistaken, or is that the ALDA sitting right next to the transmission control valve? It is missing its connection from the overboost protection valve and therefore has no boost

sure looks that way

That would be becuase it's not an ALDA. It's an ADA, used for altitude compensation on non-turbos, like this 240D.

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Dave
Boise, ID
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Thanks again, Dave. I stand corrected!

That metal can with the line missing looks like that of a non turbo engine. No boost on that one. At least that is what it looks like on my 617 non turbo engine.