Entertaining the Pedro intake mod...

[Starter986]

Originally Posted by 78F350

A bit of a side discussion... In very simple terms a resonator (that extra appendage looks like an extra resonator) increases the volume of air in the intake tube without making it flow farther. In doing so it acts as a buffer for the vacuum.
In more precise language:
https://itstillruns.com/air-intake-resonator-do-12156112.html

Deeper still is the discussion of intake runner length. A few years ago I was swapping an SUV engine into a small car and noted the SUV had a much longer intake. In simple terms, length mainly effects where the torque peaks in the power curve. Longer tubes make the torque peak sooner:
https://mechanics.stackexchange.com/questions/25236/how-does-intake-manifold-runner-length-effect-the-power-curve-of-a-car

Then there's the 2000 and later M96 engines with the cross tube and resonance flap that can spread the torque peak across a wider range:

Thank you. I find a lot of value in your posts and responses.

That hose coming off the intake tube... in the yellow circle...

You can see that the intake tube wasn't modified for that hose to attach. The hose attaches to the tube, held with the hose clamp. The photo I took a couple months back... and haven't returned to the engine to see exactly where did the hose lead under the intake manifold.

Because the intake tube wasn't modified... I'm turning to the Pros: The forum members.

Thank you.

[78F350]

Originally Posted by Starter986

... You can see that the intake tube wasn't modified for that hose to attach. The hose attaches to the tube, held with the hose clamp. ...

The parts catalog (PET) has 5 variations of intake tubing by year/model. Yours looks like is the stock tube for a 1999 and earlier Tiptronic. Here's the parts diagram (M249 is the option code for Tip.):

[Starter986]

Originally Posted by 78F350

The parts catalog (PET) has 5 variations of intake tubing by year/model. Yours looks like is the stock tube for a 1999 and earlier Tiptronic. Here's the parts diagram (M249 is the option code for Tip.):

Thank you. Just found it and wanted to report. You beat me to it.

It is the "Throttle Valve Tube". I read what generally it does. Seems necessary.

So... it came with the Tiptronic. I'll assume, unless otherwise corrected, that the manual tran arrived absent that pipe.

Does that mean that the Pedro mod won't happen on the Tip, or only with some additional fabrication to accommodate that valve tube?

Finally, if you know, what exact function is that valve tube providing?

Thank you.