Part-throttle boost tuning (BWGDC & BTEL used?)
Feb 18, 2011, 11:37 PM
#1
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Part-throttle boost tuning (BWGDC & BTEL used?)
G'day all.
What's the deal with part-throttle ECU boost control? The stuff I see in my logs doesn't seem to relate to the Boost Target Engine Load and Base WasteGate Duty Cycle tables.
Is there some simple formula the ECU falls back on for part-throttle BCS duty cycle? It seems to be dependent on throttle position and rpm - but not table-based...?
If someone could please enlighten me, I would very much appreciate it.
Rich
What's the deal with part-throttle ECU boost control? The stuff I see in my logs doesn't seem to relate to the Boost Target Engine Load and Base WasteGate Duty Cycle tables.
Is there some simple formula the ECU falls back on for part-throttle BCS duty cycle? It seems to be dependent on throttle position and rpm - but not table-based...?
If someone could please enlighten me, I would very much appreciate it.
Rich
Feb 19, 2011, 06:54 AM
#4
Evolved Member
Thread Starter
Thanks!
Wondering if the logged TPS value has a 1:1 mapping to the %TPS scale used by the BWGDC table? A steady 40% logged TPS pretty much follows the BWGDC table's 30% column.
Here are some pics...
Note: all three BWGDC tables are identical... I double-checked!
No upward correction allowed at part-throttle - purely BWGDC driven.
A wee bit of raw table data from the above log section...
I've tried to keep this to just the relevant stuff. Hope I haven't missed anything vital.
Rich
Wondering if the logged TPS value has a 1:1 mapping to the %TPS scale used by the BWGDC table? A steady 40% logged TPS pretty much follows the BWGDC table's 30% column.
Here are some pics...
Note: all three BWGDC tables are identical... I double-checked!
No upward correction allowed at part-throttle - purely BWGDC driven.
A wee bit of raw table data from the above log section...
I've tried to keep this to just the relevant stuff. Hope I haven't missed anything vital.
Rich
Feb 19, 2011, 01:41 PM
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That's because your TPS scale is wrong.
Try this one:
<scaling name="Throttle_Main - Stored Minimum Throttle %" units="%" toexpr="(x+(90/4))*100/255" frexpr="x*255/100-(90/4)" format="%.1f" min="0" max="100" inc="2" storagetype="uint16" endian="big"/>
p.s. You can thank Tephra for that.
Try this one:
<scaling name="Throttle_Main - Stored Minimum Throttle %" units="%" toexpr="(x+(90/4))*100/255" frexpr="x*255/100-(90/4)" format="%.1f" min="0" max="100" inc="2" storagetype="uint16" endian="big"/>
p.s. You can thank Tephra for that.
Feb 19, 2011, 04:37 PM
#6
Evolved Member
Thread Starter
That's because your TPS scale is wrong.
Try this one:
<scaling name="Throttle_Main - Stored Minimum Throttle %" units="%" toexpr="(x+(90/4))*100/255" frexpr="x*255/100-(90/4)" format="%.1f" min="0" max="100" inc="2" storagetype="uint16" endian="big"/>
p.s. You can thank Tephra for that.
Try this one:
<scaling name="Throttle_Main - Stored Minimum Throttle %" units="%" toexpr="(x+(90/4))*100/255" frexpr="x*255/100-(90/4)" format="%.1f" min="0" max="100" inc="2" storagetype="uint16" endian="big"/>
p.s. You can thank Tephra for that.
Cheers!
Rich
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