Annoying surge with AC on, i am at a loss...
05-05-2012, 02:13 PM
#13
Well you have to make a custom PiD to log ac pressure. I will post up the equation tonight, it uses ac voltage to generate the pressure.
Well the problem is pretty much gone. I revisited my TF and TC tables, adjusting them slightly. Then i copied over the ac torque loss tables over from a 2002 camaro since ours the main torque loss table is zeroed out from the factory. I decreased the IAT table done some the. I started increaseing the main ac torque loss table. I kept increasing it until the surging went away.
Well the problem is pretty much gone. I revisited my TF and TC tables, adjusting them slightly. Then i copied over the ac torque loss tables over from a 2002 camaro since ours the main torque loss table is zeroed out from the factory. I decreased the IAT table done some the. I started increaseing the main ac torque loss table. I kept increasing it until the surging went away.
05-05-2012, 05:52 PM
#14
Why did you decide to go with camaro tq tables instead of the silverado tables? I noticed on the camaro's tables, the IAT tables are low and most of the added airflow comes form the ac pressure table. Also the inertia tq is a lot higher in the camaro tune vs the truck.
I got my IAT table squared away. It doesn't buck once the clutch engages anymore. But for some reason, after a few seconds with the clutched engaged, it starts to surge uncontrollably.
I got my IAT table squared away. It doesn't buck once the clutch engages anymore. But for some reason, after a few seconds with the clutched engaged, it starts to surge uncontrollably.
05-05-2012, 11:11 PM
#17
In bold is how you log AC pressures
# ================================================== ============================
# File details
# ------------
#
# This section defines various details about the file format.
*FILE
#Parameter Value Description
#---------- ---------------- ---------------------------------------------------
VERSION 7.1.1 File version
DECSEP . Decimal separator used in this file
# ================================================== ============================
# Units
# -------------------
# See sae_generic.txt for more information on the *UNITS section
*UNITS
#Code System Abbr Description
#-------- ---------- -------- -------------------------------------------------------------
MPG Imperial MPG "Miles Per Gallon"
PSI Imperial PSI "Pounds Per Square Inch
KPA Metric KPA "Kilo Pascals"
GPS Metric gps "Grams per Second"
LBPM Imperial lbpm "Pounds per Minute"
unit Metric unit "Unit"
# ================================================== ============================
# Add slot definitions here
# -------------------------------- ({SAE.VSS.mph})/({GM.INJFLOW.lbpm} *{GM.IBPW1}* {SAE.RPM} * 2 / 6250 )"
# See sae_generic.txt for more information on "SLOT" formats
#
#Units Low High Fmt Expression
#------------ ------------- ------------- ---- --------------------------------------------------------------
# LTFT Average
*CLC-00-001
factor 0.00 2.0 .1 "1 + (({SAE.LONGFT1} + {SAE.LONGFT2})/200)"
# STFT Average
*CLC-00-002
factor 0.00 2.0 .1 "1 + (({SAE.SHRTFT1} + {SAE.SHRTFT2})/200)"
*CLC-00-003
MPG 0.00 99.99 .1 "{SAE.VSS.mph}/({GM.INJFLOW.lbpm} * {GM.IBPW1} * {SAE.RPM} * 4 / 6250 )"
*CLC-00-004
PSI 0.00 100.00 .2 "(({EXT.AD1} - 0.1)*25)-12.5"
KPA 0.00 700.00 .1 "((({EXT.AD1} - 0.1)*25)-12.5)*6.89475728"
*CLC-00-005
GPS 0.0000 30.0000 .4 "(28.708 * sqrt((({GM.MANVAC.kPa} * 0.145038) + {CALC.FUEL_PRESSURE.PSI}) / 58) * 453.6/3600)"
LBPM 0.0000 200.0000 .3 "(28.708 * sqrt((({GM.MANVAC.kPa} * 0.145038) + {CALC.FUEL_PRESSURE.PSI}) / 58) * 453.6/3600)"
*CLC-00-006
factor 0.000 10.000 .3 "{CALC.INJFLOW.GPS}/{GM.INJFLOW.gps}"
*CLC-00-007
factor 0.000 10.000 .3 "{GM.CYLAIR_DMA}/{GM.DYNCYLAIR_DMA}"
*CLC-00-008
factor 0.000 10.000 .3 "{GM.MAF}/{GM.DYNAIR}"
*CLC-00-009
PSI 0.00 450.00 .2 "({GM.ACP}*94.0479)-18.8721"
KPA 0.00 3000.00 .1 "({GM.ACP}*648.4372)-130.1184"
# ================================================== ============================
*PRN - Parameter Reference Numbers
# --------------------------------
# See sae_generic.txt for more information on the *PRN section
#
#Code PRN SLOT Units System Description
#------------------------- ---- ------------ ---------------- ---------------- ------------------------------------------
CALC.LTFT_AVG F001 CLC-00-001 factor Fuel "Long Term Fuel Trim Average"
CALC.STFT_AVG F001 CLC-00-002 factor Fuel "SHORT Term Fuel Trim Average"
CALC.MPG F001 CLC-00-003 MPG Fuel "Miles Per Gallon"
CALC.FUEL_PRESSURE F001 CLC-00-004 "PSI,KPA" Fuel "Fuel Pressure"
CALC.INJFLOW F002 CLC-00-005 "GPS,LBPM" Fuel "Injector Flow from Fuel Pressure"
CALC.MARCIN F003 CLC-00-006 factor Fuel "Marcin Transform"
CALC.VE_NUMBER F003 CLC-00-007 factor Fuel "VE CALCULATE"
CALC.VE_NUMBER_2 F003 CLC-00-007 factor Fuel "VE CALCULATE_2"
CALC.AC_PRESSURE F001 CLC-00-009 "PSI,KPA" AIR "AC Pressure"
# File details
# ------------
#
# This section defines various details about the file format.
*FILE
#Parameter Value Description
#---------- ---------------- ---------------------------------------------------
VERSION 7.1.1 File version
DECSEP . Decimal separator used in this file
# ================================================== ============================
# Units
# -------------------
# See sae_generic.txt for more information on the *UNITS section
*UNITS
#Code System Abbr Description
#-------- ---------- -------- -------------------------------------------------------------
MPG Imperial MPG "Miles Per Gallon"
PSI Imperial PSI "Pounds Per Square Inch
KPA Metric KPA "Kilo Pascals"
GPS Metric gps "Grams per Second"
LBPM Imperial lbpm "Pounds per Minute"
unit Metric unit "Unit"
# ================================================== ============================
# Add slot definitions here
# -------------------------------- ({SAE.VSS.mph})/({GM.INJFLOW.lbpm} *{GM.IBPW1}* {SAE.RPM} * 2 / 6250 )"
# See sae_generic.txt for more information on "SLOT" formats
#
#Units Low High Fmt Expression
#------------ ------------- ------------- ---- --------------------------------------------------------------
# LTFT Average
*CLC-00-001
factor 0.00 2.0 .1 "1 + (({SAE.LONGFT1} + {SAE.LONGFT2})/200)"
# STFT Average
*CLC-00-002
factor 0.00 2.0 .1 "1 + (({SAE.SHRTFT1} + {SAE.SHRTFT2})/200)"
*CLC-00-003
MPG 0.00 99.99 .1 "{SAE.VSS.mph}/({GM.INJFLOW.lbpm} * {GM.IBPW1} * {SAE.RPM} * 4 / 6250 )"
*CLC-00-004
PSI 0.00 100.00 .2 "(({EXT.AD1} - 0.1)*25)-12.5"
KPA 0.00 700.00 .1 "((({EXT.AD1} - 0.1)*25)-12.5)*6.89475728"
*CLC-00-005
GPS 0.0000 30.0000 .4 "(28.708 * sqrt((({GM.MANVAC.kPa} * 0.145038) + {CALC.FUEL_PRESSURE.PSI}) / 58) * 453.6/3600)"
LBPM 0.0000 200.0000 .3 "(28.708 * sqrt((({GM.MANVAC.kPa} * 0.145038) + {CALC.FUEL_PRESSURE.PSI}) / 58) * 453.6/3600)"
*CLC-00-006
factor 0.000 10.000 .3 "{CALC.INJFLOW.GPS}/{GM.INJFLOW.gps}"
*CLC-00-007
factor 0.000 10.000 .3 "{GM.CYLAIR_DMA}/{GM.DYNCYLAIR_DMA}"
*CLC-00-008
factor 0.000 10.000 .3 "{GM.MAF}/{GM.DYNAIR}"
*CLC-00-009
PSI 0.00 450.00 .2 "({GM.ACP}*94.0479)-18.8721"
KPA 0.00 3000.00 .1 "({GM.ACP}*648.4372)-130.1184"
# ================================================== ============================
*PRN - Parameter Reference Numbers
# --------------------------------
# See sae_generic.txt for more information on the *PRN section
#
#Code PRN SLOT Units System Description
#------------------------- ---- ------------ ---------------- ---------------- ------------------------------------------
CALC.LTFT_AVG F001 CLC-00-001 factor Fuel "Long Term Fuel Trim Average"
CALC.STFT_AVG F001 CLC-00-002 factor Fuel "SHORT Term Fuel Trim Average"
CALC.MPG F001 CLC-00-003 MPG Fuel "Miles Per Gallon"
CALC.FUEL_PRESSURE F001 CLC-00-004 "PSI,KPA" Fuel "Fuel Pressure"
CALC.INJFLOW F002 CLC-00-005 "GPS,LBPM" Fuel "Injector Flow from Fuel Pressure"
CALC.MARCIN F003 CLC-00-006 factor Fuel "Marcin Transform"
CALC.VE_NUMBER F003 CLC-00-007 factor Fuel "VE CALCULATE"
CALC.VE_NUMBER_2 F003 CLC-00-007 factor Fuel "VE CALCULATE_2"
CALC.AC_PRESSURE F001 CLC-00-009 "PSI,KPA" AIR "AC Pressure"
05-07-2012, 05:54 PM
#18
hey thanks for posting that up. i went ahead a copied the ac tables from a stock 2004 z06 and it runs a ton better. i figured id try something that was built for performance from the factory. they are probably the same tables as the camaro. thanks for the tip. 
