Holset Turbo Housings

[drrhoades]

What is the difference between a Holset 3 and a Holset 5 turbo housing. I have an '06 built in Aug '05 and my buddy has a '06 built in April '06. Mine has a Holset 3 on the turbo and his has a Holset 5 cast into the turbo. We were wondering what the difference if any, was.

 

[drrhoades]

Anybody have any idea?

 

[drrhoades]

So nobody knows what the differences are between the two Holset housings?

 

[cerberusiam]

So nobody knows what the differences are between the two Holset housings?

Generally thats just a casting number that indicates a batch or run. Might be minor changes in design or mettalurgy but don't htink it is significant. AFAIK, the overall turbo design and efficiency is the same on those turbos.