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Wadesta

Member Since 11 Dec 2016
Offline Last Active Jan 20 2017 02:50 PM
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Posts I've Made

In Topic: Another TT With Boost Issues!

05 January 2017 - 05:30 AM

Nah mate, aftermarket plumbed straight into the manifold (as in no pills in the line).

Check valve did sweet nothing, so that's something else I can cross off the list.

I decided yesterday that I really need to go back to basics and work from one side to the other, so I shortened the ECV rod right up and was able to make 1 bar on the primary (wastegate disconnected) with an audible screech when it got close to 1 bar so I will go hunting for a boost / exhaust. The boost dropped down to 0.3bar once in twin turbo mode, which is what I have been seeing anyway. It also cut fuel at around 5500rpm, and threw a CEL which cleared upon restarting the car. I will grab my scan tool next drive and see if it will do it again.

In Topic: Another TT With Boost Issues!

03 January 2017 - 08:42 AM

Yeah, I'm wondering if boost is leaking past that check valve and pushing the IACV open. For the sake of $3 odd, I might replace the check valve. I think there is one in the BBOD

In Topic: Another TT With Boost Issues!

03 January 2017 - 05:19 AM

Wastegate has plenty of spring tension (when moving it by hand) and is sealing well (checked when I removed the dump pipe).

Is there a check valve or similar in the BBOD? How is positive pressure prevented from entering the vac system? (If that makes sense)

In Topic: Another TT With Boost Issues!

02 January 2017 - 07:45 PM

Lol, your not wrong there!

In Topic: Another TT With Boost Issues!

02 January 2017 - 06:29 PM

Yeah, I'm confident the secondary is spinning up. I have loosened the dump pipe off of it, driven it into TT operation and she squeals like a pig. Sure sign that it's spinning up. That and there is no code 66 being logged. Impeller and turbine wheel are in good condition. I have visually inspected them, as well as the housing with no signs of bearing failure. There is no end float in the shaft, and nominal side float (to be expected with plain bearing turbos).

The IACV operates correctly. This has been confirmed with the diagnostic connectors. My biggest concern is the amount of engine oil around the shaft of the IACV and the amount of play in the bearing. I am wondering if it's just a nice little boost leak.