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Rebuilt turbo, strange boost issues

chrisund123
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chrisund123 Community Regular

chrisund123

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So I decided to do a DIY rebuild my turbo. And now I have issues. Stupid of me to expect anything else, I know, but I'm a competent DIY'er and have a a good range of tools...

 

Anyways, the issue is that from idle, it has no boost. If you pootle along off boost it drives fine and the DSG shifts up the gears, but if you want to make some quicker progress, then the revs just climb, no power, smoke/unburned fuel out the back.

 

But, if you let off the pedal slightly then push it again, it boosts like an absolute champ and then drives totally normally.

 

Any idea what could be causing such odd behaviour?

 

It's had new VNT mechanism, which was free to move when I reassembled the turbo. The core is a Melett unit, which seems to be well thought of.

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