16v Turbo Manifolds PDF Print E-mail
Written by Stuart Brown   
Wednesday, 07 November 2007 12:56

Inlet Manifolds

Various options possible when it comes to choosing an intake manifold:
EIP 16v inlet manifold Modified 1.8 20v inlet manifold
  • Use stock K-Jetronic 16V manifold with custom fuel rail to accept EFI injectors. You'll need the Digifant EFI seats (p/n 037 133 555 A) to allow you to fit standard electronic injectors. Bosch or Siemens, and a variety of cc/min (lbs/hr) specifications can be found from VW/Audi stock. A list of some of them can be found here.
  • Use ABF manifold but swap the 225cc/min ABF injectors for some larger
  • Use an Audi S2 manifold with the fifth runner cut off and use a 1.8T fuel rail (transverse or longitudinal will work)
  • Use custom intake manifold with 1.8T fuel rail (transverse or longitudinal will work).
  • Manufacturers - RPM (more specifically for G60 16v's
  • For more space, use Scirocco 16v inlet, throttle mounts on the right - expensive but relatively plentiful in the states/Germany.
  • Use a 1.8T 20v inlet manifold with the mounting flange replaced with a standard 16v inlet manifold flange

    • Exhaust Manifolds

    Various options possible when it comes to choosing an exhaust manifold:
  • Use stock 16V manifold with different flange welded on (places turbo very low)
  • Use a cut down Audi S2 cast exhaust manifold Audi external wastegate
  • Use custom cast or tubular log type exhaust manifold with or without external wastegate
  • Use custom tubular equal length header type exhaust manifold, again with or without an external wastegate
    • The above can be classified as 2 main types of exhaust manifold; tubular and cast log type.

    Cast Log

    The cast log manifold was the design used originally by Turbo Technics when they did the conversion. It's a cheap strong way to get the turbo to fit, although some are a better fit than others. The cast log manifolds can make good power, but don't flow as well as a tubular manifold does.

    Tubular

    Some tubular manifolds are equal length others are not. The equal length of the runners helps with the turbo spool time and top end flow. The disadvantages of tubular manifolds is they can be more susceptible to cracking than other types and will probably need wrapping to get the most from it.

    Wrapping

    Using heat wrapping for the manifold and downpipe will help with the transfer of heat by holding it in the exhaust. Although that does sound odd that we hold heat in to get rid of it because, heat causes propulsion meaning that the gases leave the system quicker. Further advantage of wrapping is to reduce heat soak to other components in the engine bay, and the ambient bay temperature.
    Last Updated on Tuesday, 10 June 2008 19:17