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    • What a supercharger install on a B8 Audi S5 looks like - 2008 Audi S5 APR Stage III Supercharger build by GMP Performance

      The Audi 4.2 V8 is somewhat long in the tooth and for owners wanting to squeeze more power out of it, say those with the Audi S5 before it got the new supercharged V6 3.0 TFSI motor, supercharging it really the main option for big power gains. This particular owner went to GMP Performance who hooked him up with a APR Stage III supercharger, DXD clutch upgrade, and new brake lines all to support the roughly 187 horsepower which will be added to the car.




      Entire APR Stage 3 Supercharger Kit placed on a work-table, ready to get started.




      The process starts by removing the bumper and getting the car into service mode:


      Next up, the stock intake manifold is removed


      Once we removed the intake manifold, we found a high level of carbon build-up. This car had ~70k miles on it and its a common problem on DFI cars.


      Here is a close-up of the valves & vane


      Close-up of the valves with the vane removed.



      The carbon build-up is a problem and will restrict airflow. We went ahead and started the carbon clean-up process.

      A pair of air vanes, one partially cleaned and the other, still original.


      Cleaning completed on one of the vanes.


      Moving onto the valves, we start by cleaning each cylinder individually


      Clean valves on cylinder 1


      One cylinder at a time. We rotate the crank until both valves on the cylinder are closed. We tape off the other cylinders to keep any debris from getting into the engine. We then introduce solvents into the valve chamber and clean the affected valves and area with dentistry tools. The solvents and debris are sucked out of the cylinder resulting in a nice clean set of valves.





      With the valves clean, we proceeded with the supercharger install.

      Comparison: The whole upper black portion of the APR Supercharger is a water to air intercooler


      Slipping the supercharger onto the engine


      Supercharger installed


      Heat ex-changer for the water to air intercoolers made into the Supercharger


      Water Pump Mounted


      Heat ex-changer in place with bumper on,which didn't have to be modified.


      Stage 3 Kit install completed.


      After working up top it was time to dive under the car and change the clutch and the brake lines. This clutch disc increases the torque capacity to 559lb/ft.

      The exhaust had to come down


      Driveshaft unhooked. Time to drop the beefy transmission mount.


      Transmission out of the chassis


      Transmission Out


      OEM Pressure Plate


      Out with the old disc and in with the new


      Transmission back in


      Final phase - brake lines

      Old lines


      New Lines


      So what does all this work equal out to? The system puts down just shy of an extra 150hp to the wheels.
      This article was originally published in forum thread: What a supercharger install on a B8 Audi S5 looks like - 2008 Audi S5 APR Stage III Supercharger build by GMP Performance started by Sticky View original post
      Comments 7 Comments
      1. Yukohama's Avatar
        Yukohama -
        very nice! price?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Yukohama Click here to enlarge
        very nice! price?
        $12,349
      1. FLYING X5's Avatar
        FLYING X5 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        $12,349
        I think it's more like $13,240, plus install... Which Well I won't even try to think about... But totally worth it... Basically turning a 350hp car into a 525-550hp monster... (M5 territory)...

        But can it perform like an M5?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by FLYING X5 Click here to enlarge
        I think it's more like $13,240, plus install... Which Well I won't even try to think about... But totally worth it... Basically turning a 350hp car into a 525-550hp monster... (M5 territory)...

        But can it perform like an M5?
        Well, close to a stock F10 M5 basically: http://www.audiboost.com/content.php...r-kit-11-8-122
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by FLYING X5 Click here to enlarge
        I think it's more like $13,240, plus install...
        Depends on the year, but I wouldn't pay that Click here to enlarge
      1. FLYING X5's Avatar
        FLYING X5 -
        You wouldn't, because you probably get a discount... Click here to enlarge Basically if you were to take a '09 S5 for about $39k and throw on this kit, you'd be looking at about $55k, not to mention how much they charge for the engine clean-up (unless that's included in the installation of the kit). Too rich for my blood (yes I said it).
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by FLYING X5 Click here to enlarge
        You wouldn't, because you probably get a discount... Click here to enlarge Basically if you were to take a '09 S5 for about $39k and throw on this kit, you'd be looking at about $55k, not to mention how much they charge for the engine clean-up (unless that's included in the installation of the kit). Too rich for my blood (yes I said it).
        It isn't cheap, that's for sure.

        But more along the lines of I don't think anyone needs to pay retail for this kit right now especially with as small of a market that it targets.