Turbo Upgrade
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Thread: Turbo Upgrade

  1. #1
    New Registered User
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    Jul 2007
    St Paul MN
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    Default Turbo Upgrade


    I am looking to upgrade the stock turbo on my 4bt. Its an HC1 that I put a 12cm2 turbine housing on. I just turned up the full power screw a bit and am getting some smoke even at full boost. Gillette Diesel offers upgraded compressor housings. I need to stick with the 3" inlet, and they have a 52mm upgrade. I also have a HC1 from a non-aftercooled truck (1990), and am wondering if that would be an upgrade over the stock 4bt turbo. Does anyone know the stock size of the 4bt turbo? Based on info from Gillette diesel website, the stock turbo on the non-aftercooled dodges are 50mm.

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  3. #2
    Registered User
    Join Date
    Oct 2007
    Fulton, Missouri
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    There's a seller on eBay that has rebuilt turbos for around $600. According to the information they provide, the stock 4bt H1C has a compressor size of 44mm and the stock 6bt H1C has a 52mm compressor. Read the stickies on here and you will see the 4bt's came with a variety of compressor sizes, depending on the cpl.
    1961 Dodge Town Wagon Power Wagon- sold.
    1978 FJ55 getting first gen dodge drivetrain project stage
    1969 FJ40 getting MB diesel with 5 speed- project stage

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