3 thoughts on “Holset H1C H1E Turbo Upgrade Options”

1. David Droescher August 6, 2018 at 6:41 am

   With my upgraded h1c 16cm I do not see the bottom of the compressor map at cruse(65mph 1675 rpm 2.44:1 final). Im still not even altitude compensating for my 5600′ el. (5600=11.98 psi absolute+2 psi boost =.9 pressure raito= off the chart.) I would like to improve this with out messing with the pump/fuel.
   I am thinking of getting a bd deverter valve (requires a devided t4 or extra t3/t4 adaptor for t3-4-3) .
   https://www.dieselpowerproducts.com/p-8204-bd-power-turbine-diverter-valve-t3t4-flange.aspx How small can I go before: a) surg issues 12 divided by 2=6cm, b)boost/drive pressure out of balance, c) how would the valve effect reading the compressor map? ( would I multiply the lbs of air by 2 or some fraction thereof to shift the drive value).

   My interests are primarily in the 60 to 75 MPH RPM range with room to grow the motor after I get my aerodynamics figured out for Bonneville .

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2. Colton Bates March 20, 2019 at 1:13 am

   Hi, I have an 01 Cummins 5spd and my turbo is needing to be rebuilt but I don’t have the time to keep my truck off the road while it gets done or the time to do it myself. I do have a spare H1C kicking around and am wondering if I can put that on my truck while I take the time to rebuild the one that’s on it now? Will it cause any damage? Have you ever swapped them out?

   Thanks for any advice you can offer

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3. Jon April 15, 2019 at 11:13 am

   What’s up man! I’m just trying to upgrade the turbo on my truck directly! What would be a few options? I got a 1990 D250 with h1c.

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