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Thread: Help with Cruze tune....

  1. #21
    Joe (Moderator) joecar's Avatar
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    What is the name/description of B1940...?

  2. #22
    Lifetime Member vortecfcar's Avatar
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    The knock balancing rates are used to balance the sensitivity of individual cylinders which may be more prone to detonation.
    These balance rates will be applied on a per cylinder basis to the final knock retard values.
    The cylinder designation of A-H is used instead of 1-8 because it cannot be guaranteed each platform using this ECM will conform to a standard wiring pinout.



    Essentially, this table will always pull this much timing at said RPM and call it KR. -Nick

  3. #23
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    Quote Originally Posted by vortecfcar View Post
    I've spent the morning tinkering with the new .calz release on a customers Cruze. This thing wakes up big time below 5K, but after 5K RPM it's like it want's to go take a nap.

    My logs show the electronic throttle closing from 85% to %52 over the course of a few hundred RPM starting at about 4900RPM. At first I thought it was KR related, because I had a consistent 1.9KR from about 5K up. Then I figured out how to get rid of the mysterious 1.9KR using table B1940. My desired TQ command is a constant 190 Across the board at WOT and I'm not getting any detectable knock. Anyone have any idea why the car is closing the throttle on me?

    Nick
    Can you post the tune file? There are a lot of torque related tables

  4. #24

  5. #25
    Lifetime Member GMPX's Avatar
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    Email sent Nick.
    I no longer monitor the forum, please either post your question or create a support ticket.

  6. #26
    Lifetime Member Boost's Avatar
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    It is closing the throttle to make torque.
    '12 Caprice PPV 6.0 L77 - daily transportation
    8.7 @ 84 (1/8 mile) bolt-ons

    '02 Silverado RCSB 5.3 L59 - regularly street driven
    8.2 @ 86 (1/8 mile) stock cam and spray
    8.6 @ 84 (1/8 mile) cam and heads no spray

    Our YOUTUBE CHANNEL featuring the Silverado

  7. #27

  8. #28
    Lifetime Member Boost's Avatar
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    I think because it is trying to make the requested torque by closing the throttle. I should have worded it more specifically. This happens when the requested torque is too high. It also raises IATs.
    '12 Caprice PPV 6.0 L77 - daily transportation
    8.7 @ 84 (1/8 mile) bolt-ons

    '02 Silverado RCSB 5.3 L59 - regularly street driven
    8.2 @ 86 (1/8 mile) stock cam and spray
    8.6 @ 84 (1/8 mile) cam and heads no spray

    Our YOUTUBE CHANNEL featuring the Silverado

  9. #29
    Lifetime Member vortecfcar's Avatar
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    Interesting, it didn't do it when I commanded 175 so I suppose you might be onto something. Just seems counterproductive.

    Have you guys seen throttle openings higher than ~83% or is that typical?

    Nick

  10. #30
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    Nick, are you using the ETCTP PID or SAE.TP? SAE will only show ~83ish, ETCTP should show 100% at WOT (and ~13-16ish at idle).
    ~Erik~
    2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
    2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
    2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.

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