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Turbo Balancing

Turbocharger balancing as it applies to the Buick turbos is somewhat misunderstood. From my conversations with John Craig of Limit Engineering, I have learned that our turbos were balanced to a very low tolerance and the purpose of doing it was to reduce vibrations/harmonics that could induce noise in the exhaust system. Balancing was not done to/will not improve the performance of our turbos. I also learned that Garrett balanced the stock turbos in two different ways.

One way was to balance the turbine wheel and shaft and the  Turbo Compressor Wheels as a single unit. The other way was to balance the turbine wheel and shaft the  Turbo Compressor Wheels individually. You can tell how the balancing was done by the shape/appearance of the COMPRESSOR nut. If the nut appears to be ground down then the turbine wheel and shaft and the  Turbo Compressor Wheels (and nut) were balanced together. If the nut is not ground down then the wheels were done individually. If the wheels were done individually then it is not absolutely necessary to mark them and get them in the same location as they were prior to removal. In the case of the "ground down nut" turbo, it is a good idea to keep the wheels lined up in their original positions. If you mess them up all is not lost! John can re-balance the wheels for under $20!!! Other turbo repair shops should be able to do this as well.

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