For anyone looking to improve resolution in MAP related tables, or increase the output range of boost reading on displays.
The long version of this discussion: http://www.duramaxdiesels.com/forum/showthread.php?t=70615
Default LMM OS MAP sensor scale reads 0-366 kPa or 0-53.1psi sensor input range. This is a hard set value, with no adjustment options in EFIlive.
Should also be noted this is uncorrected boost reading from PID's GM.BOOST2_DMA or MAP2 and does NOT match up with OBDII PID SAE.MAP [which is useless in my findings]. To see calculated or corrected boost values, we use (MAP2-BARO) gives you same digital reading as a mechanical boost gauge.
To work with higher pressure values than the stock 3.5 bar GM sensor you need to change the MAP sensor and rescale the values using EFIlive.
--
(1) Purchase a 5 or 10 bar 0-5V pressure transducer to fit your build. Fleece keeps these in stock. An older topic here on the LB7/LLY 10-bar mod used a Honeywell sensor I believe. These require a spare 1/8npt port, and changing the factory harness Metripack connector to match. We scavenged one from a spare harness.
--
(2) Once you have the hardware, need to add some cax files to EFIlive directory:
C:\Program Files (x86)\EFILive\V7.5\Calibrations\
** I have attached these 3 cax files here in "lmm-map.zip" below. They will cover standard and DSP OS 12628594 versions.
(3) Open your LMM tune in EFIlive and go to Table "B3499" or look under Boost Control for a new table called "Map Sensor Scaling"
--
Depending on your default unit settings Imperial or Metric, this scale will be PSI or KPA. Suggest using metric to keep it simple.
The lower value shouldn't change, while the upper limit should be set to match your new sensor.
IE: 5BAR is 500.0kpa or 72.518869 PSI absolute
--
(4) Save your new tune file and test.
I verified this scale change on the bench using a Potentiometer connected to ECM 5V-ref, low-ref and MAP sensor pins, then reading with EFIlive. You could do the same using the connector on a engine.
Below pics of 10 BAR scale bench testing
Corrected Boost - 10 BAR Setting On Lowrance Display
--
That's all ya need. This mod should also increase the max boost values reading on the Edge CTS.
Special thanks to Brayden Fleece for hacking through a 12628594 bin file to find us this scaling data.
Also thanks to DAVe3283 for modifying our original cax files for DSP5 and setting some limits. Please verify your scaling values before saving, as we have not tested these limit with erroneous data effects on the ECM.
Cheers
-K
The long version of this discussion: http://www.duramaxdiesels.com/forum/showthread.php?t=70615
Default LMM OS MAP sensor scale reads 0-366 kPa or 0-53.1psi sensor input range. This is a hard set value, with no adjustment options in EFIlive.
Should also be noted this is uncorrected boost reading from PID's GM.BOOST2_DMA or MAP2 and does NOT match up with OBDII PID SAE.MAP [which is useless in my findings]. To see calculated or corrected boost values, we use (MAP2-BARO) gives you same digital reading as a mechanical boost gauge.
To work with higher pressure values than the stock 3.5 bar GM sensor you need to change the MAP sensor and rescale the values using EFIlive.
--
(1) Purchase a 5 or 10 bar 0-5V pressure transducer to fit your build. Fleece keeps these in stock. An older topic here on the LB7/LLY 10-bar mod used a Honeywell sensor I believe. These require a spare 1/8npt port, and changing the factory harness Metripack connector to match. We scavenged one from a spare harness.
--
(2) Once you have the hardware, need to add some cax files to EFIlive directory:
C:\Program Files (x86)\EFILive\V7.5\Calibrations\
** I have attached these 3 cax files here in "lmm-map.zip" below. They will cover standard and DSP OS 12628594 versions.
(3) Open your LMM tune in EFIlive and go to Table "B3499" or look under Boost Control for a new table called "Map Sensor Scaling"
--
Depending on your default unit settings Imperial or Metric, this scale will be PSI or KPA. Suggest using metric to keep it simple.
The lower value shouldn't change, while the upper limit should be set to match your new sensor.
IE: 5BAR is 500.0kpa or 72.518869 PSI absolute
--
(4) Save your new tune file and test.
I verified this scale change on the bench using a Potentiometer connected to ECM 5V-ref, low-ref and MAP sensor pins, then reading with EFIlive. You could do the same using the connector on a engine.
Below pics of 10 BAR scale bench testing
Corrected Boost - 10 BAR Setting On Lowrance Display
--
That's all ya need. This mod should also increase the max boost values reading on the Edge CTS.
Special thanks to Brayden Fleece for hacking through a 12628594 bin file to find us this scaling data.
Also thanks to DAVe3283 for modifying our original cax files for DSP5 and setting some limits. Please verify your scaling values before saving, as we have not tested these limit with erroneous data effects on the ECM.
Cheers
-K
