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Thread: 6.5 diesel .xdf and adx

  1. #46
    Fuel Injected! brian617's Avatar
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    Anyone done any turbo boost table tuning on one of these trucks? I would like to at some tables to see where changes where made.
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

  2. #47
    Carb and Points!
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    Quote Originally Posted by newellshk View Post
    I can't really give any suggestions about the warm starting. I would imagine that any combination of imperfect injectors, injection pump, pump timing, batteries, starter, etc would progressively cause harder starting, and adding fuel and/or timing might help in some cases. I would think that it would be safe to add 10-20% fuel to that table in the temp ranges you are targeting and see what happens.

    I will try to find some time in the near future to look at the code that deals with starting and work to expand the tables/scalars and documentation for them. Maybe then I can give some better suggestions, but keep in mind I'm not an experienced diesel tuner.
    This is very accurate. Most cold start issues are due to injectors and pump wear. You can add pulse width and basic timing advance during cranking but you are just masking mechanical issues 99% of the time. Poor atomization from old injectors on these is usually the problem. And shoving more fuel in at 22:1 compression on a cold start doesn't fix it. If you have good parts and lowered compression, having to make changes is a different story.

  3. #48
    Carb and Points!
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    Quote Originally Posted by newellshk View Post
    It isn't 0-4800 rpm. The column variable is L00B5 which I haven't had time yet to decipher the math behind, but I have started working on it. There are also the tables at 557A, 558C, 559E (labeled CAL_CRANK_SEP_TIME_2, CAL_CRANK_PILOT_PW, CAL_CRANK_SEP_TIME), along with the constants above them, only some of which are labeled. I have those tables added to my xdf but I am still working on understanding them. The hack is really more like a bunch of hints because I've already found things that are incorrect, along with a ton that are labeled but the code isn't properly commented.

    I should be able to get another iteration of the xdf posted by tuesday with most of the startup stuff added and at least partially documented.
    Don't waste time on the pilot injection stuff. It's not fully implemented in the stock code.

  4. #49
    Fuel Injected! brian617's Avatar
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    Quote Originally Posted by quadstar87 View Post
    Don't waste time on the pilot injection stuff. It's not fully implemented in the stock code.
    Got any boost table tips, or tables you might be willing to share? Be glad to post my .bin if you wanted to see my work.
    89 K1500 Scottsdale 5.7L 5spd 3:42

    Build specs: 97 4 bolt main block 350ci, Eagle rotating assembly with flat tops and 4 valve reliefs, Dart 165cc/67cc Iron Eagle heads, Manely SS valves and springs 110lbs seat @1.7, GM Ram Jet cam 196/206 @.50 .431/.451, stock intake and throttle body, heads and intake gasket matched, Delco EP377 fuel pump @ 22 psi, 427 PCM.

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