Compressor housings and diffusers

[turbojoe1]

I see a lot of options out there. Can someone shed some light on the differences between the same turbos except the housings, in a matter of flow and efficiency?

Say a 5858 with S cover vs the same 5858 with an E cover.

 

[bison]

The various 58mm wheels all perform well in a housing with a 5" diffuser. There would be little gain with more diffuser. The inlet size doesn't matter much. The housing could be a limitation in applications where high mass flow is required. You wouldn't want any of the common 67mm wheels with a 5" diffuser if you were looking to run them to their potential. The stock compressor housing is a variant of t04b and t3 and has a very small diffuser and performs lousy with larger compressor wheels. Even a 58mm compressor is limited in it.

 

[bison]

Here are 4 variations. The H, t04s04, "s", and e

 

[bison]

Precision h top and Holset below. They are identical

 

[bison]

Diffuser in Holset cover

 

[bison]

H and t04s04. Notice 3" inlet on the t04s04. Don't be deceived. It's a bad ass cover and works very well with any compressor in the 62-72mm inducer size even if the wheel has a very large exducer.

 

[bison]

T04s04 diffuser. 5 5/8. Supports a lot of mass flow. It's larger than the h

 

[bison]

S top and e bottom

 

[bison]

Both have 5" diffusers

 

[bison]

T76. Same as t04s04 except 4" inlet. Large diffuser and nozzle area. Excellent for large wheels while still retaining t4 components.

 

[JP112_89]

Life would suck without Brian.

Joe

 

[WarWagon]

Good question and responses.

 

[turbojoe1]

Thank you very much Bison, very helpful information, and pictures. I'm sure in the near future I will be obtaining a turbo from you of your recommendation.

Thanks Joe

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