Cold Map Interpolation Tuning
#1
Cold Map Interpolation Tuning
Hi All,
I have hit an interesting "thing" in the ECU - but a bit of background first:
As we know the ECU has MANY MANY maps, some of these maps are in pairs, one for COLD and one for HOT, the ECU then interpolates between the COLD map and the HOT map based on a percentage defined in an interpolation table.
I am finding that many of these tables - in particular the Throttle tables (more on that later) have a bit of a crappy interpolation:
This means that at 77C the ECU will use 94% of the HOT table and 6% of the COLD table when making a decision.
Given that my car sits at anywhere between 76C and 85C I think that's a bit crapola.
So here is the question, do we either:
a) modify the cold maps and leave the interpolation table stock?
b) modify the interpolation to make 75C give 100%, and leave the cold maps stock?
The situation is a bit more complicated by the fact that THIS PARTICULAR interpolation table is shared amongst "Throttle Requested Torque", "Throttle Maps", "AirFlow maps" and "MIVEC Intake" maps. So obviously modifying this particular interpolator table will have larger ramifications, but none that are negative... AFAIK
Thoughts?
Discuss
Cheers
D.
I have hit an interesting "thing" in the ECU - but a bit of background first:
As we know the ECU has MANY MANY maps, some of these maps are in pairs, one for COLD and one for HOT, the ECU then interpolates between the COLD map and the HOT map based on a percentage defined in an interpolation table.
I am finding that many of these tables - in particular the Throttle tables (more on that later) have a bit of a crappy interpolation:
This means that at 77C the ECU will use 94% of the HOT table and 6% of the COLD table when making a decision.
Given that my car sits at anywhere between 76C and 85C I think that's a bit crapola.
So here is the question, do we either:
a) modify the cold maps and leave the interpolation table stock?
b) modify the interpolation to make 75C give 100%, and leave the cold maps stock?
The situation is a bit more complicated by the fact that THIS PARTICULAR interpolation table is shared amongst "Throttle Requested Torque", "Throttle Maps", "AirFlow maps" and "MIVEC Intake" maps. So obviously modifying this particular interpolator table will have larger ramifications, but none that are negative... AFAIK
Thoughts?
Discuss
Cheers
D.
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Dec 22, 2010 05:42 AM