Holden SD tune accountin for temp changes
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Originally Posted by gametech
IAT gives temp and MAP gives baro. Why would either be an issue?
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Gm uses a complex model for intake air temps based on the reading from the IAT and coolant temp sensors, among other things. HPtuners allows you to switch to a simple IAT sensor only model, or change the complex model correction factors. Even something as simple as a thermostat change or cold air intake box could potentially render the original gm calculations wrong, so you may have to tweak those settings.
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Originally Posted by gametech
Gm uses a complex model for intake air temps based on the reading from the IAT and coolant temp sensors, among other things. HPtuners allows you to switch to a simple IAT sensor only model, or change the complex model correction factors. Even something as simple as a thermostat change or cold air intake box could potentially render the original gm calculations wrong, so you may have to tweak those settings.
So the Holden vehicles that come from GM in speed density have little to no changes vs the ones here in the states, just a maf fail of 0?
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There is nothing particularly special about the Holden/HSV GTS tune as far as the Operating System etc is concerned. The MAF fail settings are left stock even, in the absence of a MAF signal it will fail itself soon enough anyway
As for changes in seasons the system is running in Closed Loop remember and the O2's will take care of keeping the mixture on or around the commanded 14.63:1 AFR.
As for changes in seasons the system is running in Closed Loop remember and the O2's will take care of keeping the mixture on or around the commanded 14.63:1 AFR.
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Originally Posted by Tordne
There is nothing particularly special about the Holden/HSV GTS tune as far as the Operating System etc is concerned. The MAF fail settings are left stock even, in the absence of a MAF signal it will fail itself soon enough anyway
As for changes in seasons the system is running in Closed Loop remember and the O2's will take care of keeping the mixture on or around the commanded 14.63:1 AFR.
As for changes in seasons the system is running in Closed Loop remember and the O2's will take care of keeping the mixture on or around the commanded 14.63:1 AFR.
lean cruise
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Originally Posted by jimmyblue
It would be interesting to go through some of
those Holden tunes on the repository and look
at how they have the temperature model data
set up.
those Holden tunes on the repository and look
at how they have the temperature model data
set up.
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Originally Posted by 02sierraz71_5.3
I thought those vehicles ran alot leaner around 16:1 in closed loop because you guys dont have all the EPA bullshit we have?
lean cruise
lean cruise