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Discussion Starter · #1 · (Edited)
its been so long driving my s4 with police siren sound from the turbos and lately not getting strong boost as before and its loosing boost quickly
so i dropped the engine removed both turbos and disassembled them both apart i found the turbine wheels are damaged
i wanted to get bigger compressor wheels as an upgrade to get more boost I ordered a full repair kit
this is my s4
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this is the repair kit I bought it from AliExpress
Turbocharger repair kit K03 53039880016 53039880017 Turbo rebuild kits for Audi A6 S4 All Road 2.7T AJK ARE AJK AZB AGB 5V

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K03 Turbine wheel 37.8x45mm, Compr wheel 36.6x51mm
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this is the old
Turbine wheel , Compr wheel

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I machined the compressor wheel plate and compressor wheel housing
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Comparison between old Turbine wheel vs new one
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Sweet work on those housings… hope they last a long time for ya. Are your doing some supporting mods as well… ie SMIC, bipipe, mafs??
 
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