Wastegate adjustment

Discussion in '6.9L IH & 7.3L IDI Diesels' started by Cincinnati Guy, Sep 18, 2011.

  1. saburai

    saburai Full Access Member

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    So it's drill the dimples and then chase the thread?

    BTW - I do realize that I'm bringing this thread back from the grave.

    Hey Halloween is just around the corner :joker:
     
  2. Clb

    Clb Another old truck Supporting Member

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    Yes drill till you hit the threads on both sides, back it out and clean up the threads.
    Otherwise ya can tear the diaphragm in the gate bellows housing gizmo
     
  3. Macrobb

    Macrobb Full Access Member

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    I just unplugged the darn thing. Still having trouble getting more than about 12 out of mine, but it's still cleaning up with just that, for now.
    Generally, you can clean up the output of a maxed out stock IP with about 10-ish PSI, and make 200-220 RWHP out of it.
     
  4. Clb

    Clb Another old truck Supporting Member

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    Oye. Vey

    Can you verify the above statement please!
     
  5. Thewespaul

    Thewespaul Supporting Member Supporting Member

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    So many variables here it’s kinda hard to make such a broad statement
     
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  6. Macrobb

    Macrobb Full Access Member

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    Uh... I'm doing it? On two different trucks?
    Check my sig -
    On my '93, pushing 12 psi, I've gotten 250RWHP, and that was with a bigger than stock IP(RD2-110), obviously turbo-limited.
    It's still running the same way; pulls quite nicely, with little to no smoke... But this pump has a Hypermax smoke puff limiter on it which works wonders.

    On my '92, I maxed the pump out, took it down to Hunting 4 Horsepower in September. Proceeded to get 200RWHP out of it, and about 7-9PSI of boost.
    It would clean up around 2500RPM, flooring it. A bit lazy spooling. (*)

    A week or two later, I found out why my boost on this rig was so low: the PO had forgotten to plug the CDR port at the back of the intake manifold, so I had a 1" boost leak.
    I made a plug for it... Now it's pushing a bit over 15 when I floor it(Banks gauge only goes to 15), and it responds nicely.
    Totally cleans up the maxed out pump over 2K, and it's hard to get much of any smoke except for a puff till the turbo spools if I really hammer on it.
    Yes, flooring it at idle will definitely make some smoke, which is why I DON'T DO THIS.


    (* I actually have video of this; I could probably upload it to youtube if needed).

    Eh, that's why I'm being a bit conservative. I've been able to get the 200 RWHP number myself; have watched at least one other turbo IDI do it on the dyno, and have seen several other forumgoers claim it.
     
  7. Thewespaul

    Thewespaul Supporting Member Supporting Member

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    I appreciate that your pushing the envelope, but telling people to just plug their wastegate and max their fuel is not really the best advice especially for owners that just need a little more power for their tow rig and may not necessarily have much mechanical knowledge. For you and me if we blow a headgasket well it’s forced upgrades, but for someone else that may be their ride to work.
    On another note I dare you to get a drive pressure gauge, I bet your 15 psi of boost is equal to 40+ psi of drive pressure LOL
     
  8. saburai

    saburai Full Access Member

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    Hey, I've got scads of mechanical knowledge, went to trade school and have been wrenching for better than 40 years. I just act dumb and ask a lot of questions :rolleyes:
    But seriously, I would fall into the category of not only is the truck my DD, but I'm pulling our house with it. I cannot afford to have a breakdown, catistorpic engine failure or otherwise, say, pulling up Fancy Gap pass...
     
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