10 year project X, This Has been Along Time Coming!

Discussion in 'Member Builds' started by akakrill, Nov 24, 2017.

  1. NHXRUNNER

    NHXRUNNER "New Hampster"
    Staff Member

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    [​IMG]

    [​IMG]
     
  2. akakrill

    akakrill Member

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    Ha, you know gadgets probably not joking, but this next mod is my last. 38-91 and 80# injectors. That's finally it.
     
  3. Gadget

    Gadget Well-Known Member

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    Never say never......
     
  4. SoFloBlue

    SoFloBlue Member

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    I second that picture ! Haha
     
  5. shane881510

    shane881510 Member

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    What u mean mrk4, I’ve already done the biggest unit The -92 with 70mm pulley. What else can u be doing g man.
     
  6. Slywhitty

    Slywhitty "Midget Magnet"

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    Spill the beans already would ya!!
     
  7. akakrill

    akakrill Member

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    Do you have a custom bracket or air box? How do you fit the -92 on the URD kit and why would you over the -91? I realize the pressure maps for them are the same but the -92 has physically different dimensions. The main issue I would see is that you would need a different size intake coupling at 89mm, but to no benefit because the intake inside diameter is the same 70mm as the -91. The big difference I see is the -92 is 203mm overall length;

    -81 is 188mm = 7.4 inches
    -91 is 196mm = 7.72 inches
    -92 is 203mm = 7.99 inches

    Which I believe, each unit would push back the URD air filter box assembly toward the firewall aprx. another 1/4" from the -91 and 5/8" or so from the -81. So even if there was room, I still don't get why Rotrex even makes two chargers so close in model or why one would choose one over the other. Please educate me.

    Rotrex-Technical-Datasheet-C38-Range_Page_6.jpg Rotrex-Technical-Datasheet-C38-Range_Page_7.jpg
     
  8. shane881510

    shane881510 Member

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    5D443105-7C97-4189-8B25-C0127B955031.jpeg I have no idea whats different about the -91 to the -92. It was same price as 91 but I can run a bigger air intake. I got rid of that urd box years ago made my own Intake. Just changed the coupling to the 3.5” to use with my intake. I wanted the biggest one retrex offered and that was the -92. Uses same bracket as -81.
     
  9. Gadget

    Gadget Well-Known Member

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    The -91 and -92 are the same except for the inlet diameter. The -91 uses a 3" and the -92 uses a 3.5" inlet and then necks down inside to a 3".
     

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