Disable CLT/IAT calibration "Safe" values

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Disable CLT/IAT calibration "Safe" values

Postby Reverant » Sun Dec 24, 2017 5:20 am

Hi Phil,

when TS calculates the CL/IAT thermistor tables, the first and last 20 entries in the table are set to 70*F for the IAT and 180*F for the coolant.

Can you add a way to override this behavior, either by disabling it completely (thereby allowing for better diagnostics - shorted wire to ground/vref or open wire) or by allowing the user to enter a custom value, such as say 250*F (that would trigger the fan, in case of the CLT). Yes, the MS3 can do diagnostics but it still won't switch on the cooling fan if say the wire to the sensor is cut or if the sensor fails. The MS2 can't do diagnostics so MS2 users don't have any options on that front.

Thank you!
The man behind MS Labs
2002 Mazda Miata 1.8 6sp - Enhanced MS3 1.4.0, sequential injection, sequential ignition, big turbo, lots of boost - InCar PC
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Re: Disable CLT/IAT calibration "Safe" values

Postby LT401Vette » Sun Dec 31, 2017 2:39 pm

You can edit the ini, or add a custom.ini

That is where the Default values and the table limits are defined.
When TS goes out of the defined range, that is when it goes to the default value.

The primary file TS uses is:
[TunerStudioInstallFolder]/inc/ms2ReferenceTables.ini

But is you add a [ReferenceTables] to your other ini files, it will over-ride those.

From that:
Code: Select all
    referenceTable = std_ms2gentherm, "Calibrate Thermistor Tables..."
       topicHelp = "http://www.megamanual.com/mt28.htm#oh"
        tableIdentifier   = 000, "Coolant Temperature Sensor", 001, "Air Temperature Sensor"
        ; tableLimits (optional) = intentifier, min, max, defaultVal
        ; will set the default value if value is outside the min and max limits.
        tableLimits   = 001, -40, 350, 70
#if EXPANDED_CLT_TEMP
   tableLimits = 000, -40, 400, 350
#else
   tableLimits = 000, -40, 350, 180
#endif


It is that tableLimits:
tableLimits = 000, -40, 400, 350

That means for table 000, the min is -40, max 400, default value is 350.

So whe the temp curve is generated, if outside the min and max, the default 350 will be sent.
Phil Tobin
EFI Analytics, helping to simplify EFI
Next Generation tuning software.
Supporting all MegaSquirt versions and firmwares.
http://www.TunerStudio.com
http://www.efiAnalytics.com/MegaLogViewer/
Support the firmware running your engine:
http://www.msextra.com/doc/donations.html
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Re: Disable CLT/IAT calibration "Safe" values

Postby Reverant » Tue Jan 02, 2018 6:23 am

Hi Phil,

thank you for the response. I see two problems here:

1) Whenever TS updates, I will need to go back and edit the ini file.
2) If an end-level user tries to update the calibrations, he will override the "safe" values.

What does having these "safe" values accomplish?
The man behind MS Labs
2002 Mazda Miata 1.8 6sp - Enhanced MS3 1.4.0, sequential injection, sequential ignition, big turbo, lots of boost - InCar PC
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Re: Disable CLT/IAT calibration "Safe" values

Postby LT401Vette » Tue Jan 02, 2018 6:58 am

This comes from the old megatune days..

The thought behind that I believe is that if you are completely out of range, your sensor is probably missing or malfunctioned. By going to the default value, your engine will still have a hope of running half decent.

It is not recommended to edit the TS install files directly, they will get over written at some point. But as said above you can over-ride the behavior in a custom.ini if you have a specific condition you want to disable this.
Phil Tobin
EFI Analytics, helping to simplify EFI
Next Generation tuning software.
Supporting all MegaSquirt versions and firmwares.
http://www.TunerStudio.com
http://www.efiAnalytics.com/MegaLogViewer/
Support the firmware running your engine:
http://www.msextra.com/doc/donations.html
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