VW Audi Group GT20V Supercession

The turbos in this range have chaged on quite few occasions. For servicing use the following guide:
  • 454135-0001 changed to 454135-0002 then to 454135-0006. Use 454135-0006 as a Direct Service Replacement. These are all Step I VNT’s with 12 vanes and cannot be interchanged with Step II VNT’s. 
  • 454135-0003 changed to 454135-0005 then to 454135-0008 then to 454135-0010. Use 454135-0010 as a Direct Service Replacement. These are all Step II VNT’s with 13 vanes and cannot be interchanged with Step I VNT’s.Note:

    GT15V and GT17V VNT’s have 9 vanes in Step I and 11 vanes in Step II.
    GT20V VNT’s have 12 vanes in step I and 13 vanes in Step II.

    TREVOR CASS
    Product Support Engineer
    Allied Signal Turbocharger Aftermarket

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