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Thundermax

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  • fatbat
    fatbat
    3 years ago
    It makes absolutely no sense to me to
    replace a good functioning oem Delphi ecu that can have its tables and values changed with more capability via a flash tuner 
  • Wideglider
    Wideglider
    3 years ago
    Quoting Grease Monkey on 01 Oct 2021 03:43 AM

    Tmax uses lookup tables to adjust spark, nothing fancy, ie spark temp correction ETC, you blokes that know what that is will understand, they even tell you that those tables may need to be adjusted to suit your bike, kind of a disclaimer that most will never read, as far as I know it does not sense real time knock or adjust for that, from what I understand the auto-tune is a fancy name for a wide band 02 closed loop fuel trim, harley had their WB version awhile back, I have one in the shed, PV have them as well, stock HD's use a narrow band closed loop, probably pointless saying it works better, end of the day if you just installed the tmax and rode away its not tuned, it has a cal from the bank in it that would benefit greatly by following the tuning link I put up earlier or taking it to a real tuner, same as all of the decent systems. 


    My comment about putting Lushy out of work was tongue in cheek, not a chance that will happen anytime soon, I would take my bike to him if he was closer.

    The tuning link again.

    If I'm wrong I'm happy to be educated, but give me something that I can read, unless its your trade, just saying bollocks don't cut it.


    Quoting Wideglider on 01 Oct 2021 10:40 AM

    Thanks GM for your reply & explaining the auto-tuning that Thundermax does.

    Your great examples:
    Oxygen fuel-trimming
    Spark temperature correction
    (The 'Look-up tables' you mention are a very reliable conventional standard for any modern controller).
    Some more features to support your auto-tuning argument are from the Thundermax website pdf (again):
    ThunderMax automatically adjusts timing tables for the following changing conditions: 
    Changes in Engine Temperature, 
    Barometer, 
    Intake Air Temperature 
    plus a Separate Scale for Boost Applications. 

    I don't quite know what other systems you would consider 'fancy', but yes I agree with you that the bottom line is that Thundermax is auto-tuning.

    Quoting FBUser214 on 02 Oct 2021 01:33 AMedited: 02 Oct 2021 04:46 AM

    Not sure how you could take GM's post to be an endorsement of thundermax's auto tuning capabilities.
    At best thundermax has auto part tuning capability. It does fuel trims and spark temperature correction. Spark temperature correction is not the same as spark advance or timing correction.
    As far as I understand the thundermax ecm has no knock sensing capability, whereas the delphi ecm has ion sensing knock control capability used by some of the more advanced flash tuners to pull timing where appropriate and avoid knock.
    The timing tables in thundermax are manipulated manually to avoid knock and running rich AFR's is part of the strategy. Spark temperature correction comes into play as well and is achieved using the input from other sensors.
    Other systems using the stock ecm, have spark temperature correction as well as knock control and recording of these events allows the adjustments to be made manually to the timing tables in the calibration where required.

    GM actually lists some parameters/set points that are auto-tuned, so my previous comment was tongue in cheek ;)
    I list some additional setpoints/parameters that are also auto-tuned.

    I am fully aware that spark temperature correction is not spark advance timing adjustment.
    I think yourself and some others are just trying to make a blanket statement, saying outright that there is no auto-tuning at all if Thundermax doesn't have a specific spark advance/retard feature that adjusts automatically to conditions.
    If that is a person's only interpretation of auto-tuning then so be it. But I certainly wouldn't call the multitude of other auto-tune features Thundermax has as gimmicks!
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