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Best turbo dunp size by a Garrett engineer

Discussion in 'General car Chat' started by TCJBOLDIE, 4 January 2017.

  1. TCJBOLDIE

    TCJBOLDIE Pro Tuner

    Messages:
    3,636
    From:
    Brisbane
    Car:
    JB Starion
    obi_waynne likes this.
  2. old-git

    old-git Moderator

    Messages:
    9,033
    From:
    Essex
    Car:
    Elan & Robin Hood
    Thanks, but my 3" Ceramc coated system cost over £1600 so I will stick with it for now :)
     
  3. TCJBOLDIE

    TCJBOLDIE Pro Tuner

    Messages:
    3,636
    From:
    Brisbane
    Car:
    JB Starion
    Steve I'm sure you know I was just yanking your chain :D
     
  4. MADRod

    MADRod Road Burner

    Messages:
    282
    Car:
    Sierra RS Cosworth
    3" system was used on my YB at 700bhp & indeed it became the first YB to exceed 200mph in that form. Only went to 3.5" when Power went over 800bhp. I suggests Steves choice is just right for his Spec.
     
  5. SLEEPER

    SLEEPER Pro Tuner

    Messages:
    2,685
    im not sure that hp is the only factor on exhaust size .
    Id have thought hp isnt directly related to cc or revs but these are the factors that I would have thought are more likely to determine the amount of exhaust gases which is what the exhaust design is removing
     
  6. TCJBOLDIE

    TCJBOLDIE Pro Tuner

    Messages:
    3,636
    From:
    Brisbane
    Car:
    JB Starion
    Logic tells me that the free flow of the exhaust gasses is governed by the header design including the internal diameter of the runners followed by the turbine housing AR and then by the dump and system diameter and the design of the silencer.

    I am aware that cam profile ,timing, valve lift etc,port design and valve size also have a part to play.

    IMO any turbo needs as close as possible to zero back pressure after exiting the turbine housing.

    Just thinking out loud BUT happy to stand corrected if incorrect :)
     
    Last edited: 5 February 2017
  7. SLEEPER

    SLEEPER Pro Tuner

    Messages:
    2,685
    6boost.jpg just bought a new 6boost twin schroll manifold . theoretically same lenght and diameter pipes to the twin schroll fitting with 3 cylinders into each .
     
  8. TCJBOLDIE

    TCJBOLDIE Pro Tuner

    Messages:
    3,636
    From:
    Brisbane
    Car:
    JB Starion
    Made in sunny Queensland Australia |B:)

    Black ceramic coated as well??
     
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