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donbecker1234's Avatar
 
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Wastegate vent routing thru tin - why?

Looking at the driver's side tin on the 930 engine, it appears there are two round holes, one for the control line to the wastegate and one for the vent line off the wastegate.

1. Was the Wastegate vent line routed thru the tin (instead of just being open air) for emissions?

2. What did/does the Wastegate vent line route to?

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1987 M491 Widebody, Nautic Blue / Linen with a 1979 930 3.3L Cali Engine
Old 08-28-2020, 10:01 AM
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Atmospheric pressure must be on one side of the diaphragm as a reference, boost is on the other side. Diaphragm moves so vent is dynamic.
Vet line is in engine bay to protect from road debris and water blocking it.
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Old 08-28-2020, 10:52 AM
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Quote:
Originally Posted by RarlyL8 View Post
Atmospheric pressure must be on one side of the diaphragm as a reference, boost is on the other side. Diaphragm moves so vent is dynamic.
Vet line is in engine bay to protect from road debris and water blocking it.
Does that mean that the vent line from the wastegate is supposed to be open in the engine compartment, not hooked up to anything?
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Old 08-28-2020, 11:31 AM
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Correct. Not hooked to anything

Brandon
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Old 08-28-2020, 12:12 PM
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Quote:
Originally Posted by donbecker1234 View Post
Does that mean that the vent line from the wastegate is supposed to be open in the engine compartment, not hooked up to anything?
Yes. At least on mine, and pretty sure unmolested until I started touching it inappropriately, there was a short roughly 75 degree bent aluminium tube stuffed in the end of the hose so open end of the vent tube points downwards.
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Old 08-29-2020, 07:14 AM
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The cleaner the air is at the vent side of the wastegate the better. 924 turbos use the same wastegate but have a short little vent cap, those are located in the "dirty" airstream under the car. A few high Mileage ones I have taken to bits are full of fine grit from the road, this can be very abrasive and cause wear on the inside of the housing and diaphragm. So having the vent up higher in the cooler cleaner side of the engine should increase the lifespan.
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Old 08-29-2020, 08:53 AM
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The wastegate vent is exposed to a lesser amount of dust by being in the engine compartment than it would if it was open to the road, but it still gets dusty in there.
The next step in ocd cleanliness is to attach a length of corrugate plastic tubing to the hard vent line, the longer the better. It will force any dust to drop out of the airflow before it can enter the wastegate.
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Old 08-29-2020, 12:16 PM
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That's a good idea.
Old 08-29-2020, 03:24 PM
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TiAL waste gate

On my 930 the waste gate vent is up in the engine compartment.

Old 09-12-2020, 06:41 AM
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