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    • This is how light the aluminum Audi 2.5 TFSI block is - Built motor 8V RS3 with Dodson upgraded transmission going for 9's

      With the 8V generation Audi RS3 sedan and the MKIII TT-RS the 2.5 TFSI motor received more changes than just the dual injection fuel system. The 2.5 TFSI I5 moved to a lighter aluminum block from iron which combined with magnesium bits shaved 57 pounds off the previous motor.


      The block is light enough to easily hold up. The question is, how strong is it? Iroz Motorsport is building an example and states the bottom end is quite stout especially when sleeved.

      The goal here is to go deep into the 9's with a turbo upgrade as well as a Dodson dual clutch transmission upgrade.

      Considering cars with the new aluminum 2.5 TFSI are already doing mid 10's on the factory turbocharger with just a tune, 9-seconds in the 1/4 mile should be relatively easy to achieve with built motor examples.


      This article was originally published in forum thread: This is how light the aluminum Audi 2.5 TFSI block is - Built motor 8V RS3 with Dodson upgraded transmission going for 9's started by Sticky View original post
      Comments 3 Comments
      1. Stevenh's Avatar
        Stevenh -
        Very cool. I'm more interested in what it'll do with the stock turbo housing but this will be fun to watch. 9s won't even break a sweat with a new turbo/manifold.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Very cool. I'm more interested in what it'll do with the stock turbo housing but this will be fun to watch. 9s won't even break a sweat with a new turbo/manifold.
        I fully expect to see 9-second stock internal examples. It's nice several tuners are tackling this thing.
      1. leveraged sellout's Avatar
        leveraged sellout -
        Incredible, too bad it doesn't handle like an M2. But this is a very nice car for the money, and for bad weather climates. And the sound of a turbo I5 is always welcome.