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Thread: How do I adapt a Holset hy35 to a 3" exhaust?

  1. #1
    boostaholic TurbododgePirate's Avatar
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    How do I adapt a Holset hy35 to a 3" exhaust?

    What should I do to adapt a holset hy35 turbo to my 3" exhaust?

  2. #2
    Hybrid booster
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    Re: How do I adapt a Holset hy35 to a 3" exhaust?

    I would cut off the elbow that is currently there, weld on a cast iron 90 (use the schedule 40 that people use for manifolds) then cut the --- end off of a 2.25" swingvalve and weld it back onto the 90, after opening it up as much as possible. Until the turbo is hanging in the car, theres no way to be sure this would work. You would have to play with it for sure, maybe use part of a 45 to make the angle just right to line up with the dp, but it should be possible.

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    Re: How do I adapt a Holset hy35 to a 3" exhaust?

    depends on the Holset. What year and so on. The early ones are easy, just a flang. The mid years are a cut and paste, the current years are different again with a 4 3/8" flang.

  4. #4

    Re: How do I adapt a Holset hy35 to a 3" exhaust?

    My '01 HY35 has a 3" flange on it stock.. Facing the wrong way, so I'll have to cut and re-weld.. but saved me some hassle I guess.

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    Re: How do I adapt a Holset hy35 to a 3" exhaust?

    Una is it not held on by a band clamp? mine came with a cast iron elbow that I don't intend to use it's for sale if you want it

  6. #6
    boostaholic TurbododgePirate's Avatar
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    Re: How do I adapt a Holset hy35 to a 3" exhaust?

    This one has what looks like ALMOST a 90^ cast iron bend in it that is held on with a V band clamp. Not 100% sure on the size.

  7. #7

    Re: How do I adapt a Holset hy35 to a 3" exhaust?

    Quote Originally Posted by Garret
    Una is it not held on by a band clamp? mine came with a cast iron elbow that I don't intend to use it's for sale if you want it
    Nope, not a V-band.. Has what looks like a 5 bolt flange.. Can't rotate it at all. I need to grab it and snap a couple pictures sometime..

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