Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Optimizing the TB

Originally posted by GTO Pete:

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Originally posted by Tourige:

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Originally posted by GTO Pete:

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You can take it even further and dremel down the uneven "ridges" inside the TB. Knife edging is also an option.

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Thats a little more extreme, its also prone to over dremeling and then you need a new TB

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Knife edging can be. For the ridges, it's not "prone" to it. There is plenty "meat" there - unless you go absolutely crazy with the dremel. I've optimized ~6 TBs and never had a problem.

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Dremeling down the edges to remove the ridges will work but will not give the best/cleanest results and can take a lot of time. I have done a few and along with modifying the TB shaft on a Milling machine (not by hand) I taper the intake side and the output side of the TB on a lathe to get a perfectly smooth finish and even transition from the 60mm bore to the outer edge. Also by doing the TB shaft in a mil you get precise accuracy and a perfect countersink on the TB plate. This is an example of what Pete is referring toâ�?�¦these are a SVT TB non-optimized and an optimized 65mm Mustang TB. Note the outer edge difference between the two (the TB shafts have not yet been done in this pic), the SVT edge is thick and the Mustang is very thin â�?��?razor likeâ�?�. This eliminates any ridges from the intake tube into the TB creating smoother airflow.