Maximum Operating Load - stuck

[Themainmandan]

I am trying to adjust my maximum operating load values to “4” but they will only go up to “2”..

The minimum value is 0 and the maximum value says it is 4 (states this under “table information” on the far right.)

I do have “Allow Entering Unsafe Values” enabled and yet, I am unable to get past “2”.

Is there something I’m doing wrong?


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[mituc]

You may need to go do the Advanced features and allow for unsafe values.

[Themainmandan]

You may need to go do the Advanced features and allow for unsafe values.

I have it enabled already..


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[Themainmandan]

I am trying to adjust my maximum operating load values to “4” but they will only go up to “2”..

The minimum value is 0 and the maximum value says it is 4 (states this under “table information” on the far right.)

I do have “Allow Entering Unsafe Values” enabled and yet, I am unable to get past “2”.

Is there something I’m doing wrong?


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[mention]Ugnius VersaTune [/mention] would love to hear your thoughts!


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[Ugnius @ VersaTune]

This table stores its values as 16 bit integers in the ECU ROM. You can fit any number from 0 to 65535 into that. The ECU then multiplies the value by 0.0000305 to get the actual load. As a result the maximum allowed value is 65535 x 0.0000305 = 2
The only way to allow larger values is to alter the multiplier and rescale the table.
Is it a limit for your tune?

[Themainmandan]

Oh wow ok haha thanks

I find that it is.. at least I think.. with the mods to the engine and how it’s tuned, at very high load, it tends to cut fuel right at the top resulting in a loss in power obviously and some blue smoke due to the oil injectors still doing their thing.. only last a couple of seconds and clears up.

I’ve done a series of tests where I can bring the car up to 9500rpm under low load and keep the rpms high with no issues.. it’s only when load is at its peak (even at some lower rpm) that it cuts fuel for a split second

So what’s the best way to go about this?

Thanks for your help!


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[Themainmandan]

This table stores its values as 16 bit integers in the ECU ROM. You can fit any number from 0 to 65535 into that. The ECU then multiplies the value by 0.0000305 to get the actual load. As a result the maximum allowed value is 65535 x 0.0000305 = 2
The only way to allow larger values is to alter the multiplier and rescale the table.
Is it a limit for your tune?

Would I find the multiplier and add 13115 instead of the other value?


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[mituc]

To jump from 65535 (2^16-1) to 131071 (2^17-1) you'd need one more bit, so that number will require 17 bits instead of 16 which would require fundamental design changes of the ECU logic.

[Themainmandan]

So it’s impossible to get the absolute load to the maximum of 4? What happens when I supercharge my engine?


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[mituc]

So it’s impossible to get the absolute load to the maximum of 4? What happens when I supercharge my engine?

At load 2 you should be well above 400bhp, so I'd struggle to get there first
The factory ECU may have some limitations which is the reason why people go stand-alone ECU with the extreme builds. However the Mazdaspeed platform supports 1000+bhp on the factory ECU but that one was designed for turbocharged applications from the get-go.