I have been getting a lot of KR at part throttle, mostly 80kPa - 110.
I am using $59 but I think the same principal applies to $58 as I loaded a $58 xdf and one of the Ultimate for Vortec 50# tunes and have the same result.
OK, after looking at things a little closer, here is what I am seeing....
These areas are definitely pre-boost but on the log files, I am seeing PE kick in. It then goes rich and the KR starts until I either get out of it or I give it more gas to go into boost. I had one occurance where I got up to 21 lbs, 9 deg timing and NO KR. I suspect it's due to PE enabling at this high load, pre-boost area.
I am thinking about changing the following in an attempt to keep this from happening. My question is whether this is a good idea or will it screw something else up?
KPEMAP1 - 137
KPEMAP2 - 315 (was 77.23)
KPEMAP3 - 315 (was 89.53)
KPEMAP4 - 315
Here is what I am reading on the P4 document. There seems to be a typo under Condition #3 letter b.
Although I believe I was matching up with Condition #3 section c. when my PE was kicking in.
9.1.4.7 Power Enrichment Air Fuel Ratio
The power enrichment function modifies the system air fuel ratio as a function of RPM and
BARO to allow a "best torque" under a heavy engine load condition.
9.1.4.7.1 Power Enrichment Enable
Power enrichment is enabled when in the Run Fuel Mode, the engine is running in the EST
mode and one of the following sets of conditions are met.
Condition #1
1. Manifold Absolute Pressure (MAP) exceeds *KPEMAPl*.
The MAP variable used depends on the engine application and sensor installed.
*KAFOPT3*, b5 = 0 Single atmosphere MAP sensor.
*KAFOPT3*, b5 = 1 Two-atmosphere MAP sensor.
Condition #2
1. Manifold Absolute Pressure (MAP) less than or equal to *KPEMAPl*, EST enabled,
throttle position greater than or equal to *KPETPS*, and any of the following
additional conditions:
· Engine speed greater than or equal to *KPERPM*, or
· Rate of change of throttle position (over 25 mSec) greater than or equal to a
value from the *F63* table as a function of barometric pressure), or
· Throttle position greater than *KPEATPS*.
Condition #3
Manifold Absolute Pressure (MAP) less than or equal to *KPEMAPi*, EST enabled,
throttle position less than *KPETPS*, and any of the following additional conditions:
a. Manifold Absolute Pressure (MAP, selected according to the installed
sensor, as defined above) greater than or equal to *KPEMAP2*, and engine
coolant temperature greater than or equal to *KPETCTH*, or
b. Manifold Absolute Pressure (MAP, selected according to the installed
sensor, as defined above) greater than or equal to *KPEMAP2*, engine
coolant temperature less than *KPEMAP3*, filtered vehicle speed (MPH)
less than *KPEMPH*, and engine speed greater than or equal to
*KPERPM*, or
c. Manifold Absolute Pressure (MAP, selected according to the installed
sensor, as defined above) greater than or equal to *KPEMAP2*, engine
coolant temperature less than *KPETCTH*, MAP greater than or equal to
*KPEMAP3*, filtered vehicle speed (MPH) greater than or equal to
*KPEMPH*, and engine speed greater than or equal to *KPERPM1*.
Condition #4 - Forced Power Enrichment Mode.
Satisfying the criteria of this Condition will force power enrichment in the event that
EST is disabled due to Malfunction Code 42 or operation in backup spark mode.
1. manifold Absolute Pressure (MAP, selected according to the installed sensor, as
defined above) less than or equal to *KPEMAP1*, and,
2. EST disabled, and
3. MAP greater than *KPEMAP4Z*, and
4. Engine speed greater than *KPERPM4Z*
Thoughts on making these changes?
I am using $59 but I think the same principal applies to $58 as I loaded a $58 xdf and one of the Ultimate for Vortec 50# tunes and have the same result.
OK, after looking at things a little closer, here is what I am seeing....
These areas are definitely pre-boost but on the log files, I am seeing PE kick in. It then goes rich and the KR starts until I either get out of it or I give it more gas to go into boost. I had one occurance where I got up to 21 lbs, 9 deg timing and NO KR. I suspect it's due to PE enabling at this high load, pre-boost area.
I am thinking about changing the following in an attempt to keep this from happening. My question is whether this is a good idea or will it screw something else up?
KPEMAP1 - 137
KPEMAP2 - 315 (was 77.23)
KPEMAP3 - 315 (was 89.53)
KPEMAP4 - 315
Here is what I am reading on the P4 document. There seems to be a typo under Condition #3 letter b.
Although I believe I was matching up with Condition #3 section c. when my PE was kicking in.
9.1.4.7 Power Enrichment Air Fuel Ratio
The power enrichment function modifies the system air fuel ratio as a function of RPM and
BARO to allow a "best torque" under a heavy engine load condition.
9.1.4.7.1 Power Enrichment Enable
Power enrichment is enabled when in the Run Fuel Mode, the engine is running in the EST
mode and one of the following sets of conditions are met.
Condition #1
1. Manifold Absolute Pressure (MAP) exceeds *KPEMAPl*.
The MAP variable used depends on the engine application and sensor installed.
*KAFOPT3*, b5 = 0 Single atmosphere MAP sensor.
*KAFOPT3*, b5 = 1 Two-atmosphere MAP sensor.
Condition #2
1. Manifold Absolute Pressure (MAP) less than or equal to *KPEMAPl*, EST enabled,
throttle position greater than or equal to *KPETPS*, and any of the following
additional conditions:
· Engine speed greater than or equal to *KPERPM*, or
· Rate of change of throttle position (over 25 mSec) greater than or equal to a
value from the *F63* table as a function of barometric pressure), or
· Throttle position greater than *KPEATPS*.
Condition #3
Manifold Absolute Pressure (MAP) less than or equal to *KPEMAPi*, EST enabled,
throttle position less than *KPETPS*, and any of the following additional conditions:
a. Manifold Absolute Pressure (MAP, selected according to the installed
sensor, as defined above) greater than or equal to *KPEMAP2*, and engine
coolant temperature greater than or equal to *KPETCTH*, or
b. Manifold Absolute Pressure (MAP, selected according to the installed
sensor, as defined above) greater than or equal to *KPEMAP2*, engine
coolant temperature less than *KPEMAP3*, filtered vehicle speed (MPH)
less than *KPEMPH*, and engine speed greater than or equal to
*KPERPM*, or
c. Manifold Absolute Pressure (MAP, selected according to the installed
sensor, as defined above) greater than or equal to *KPEMAP2*, engine
coolant temperature less than *KPETCTH*, MAP greater than or equal to
*KPEMAP3*, filtered vehicle speed (MPH) greater than or equal to
*KPEMPH*, and engine speed greater than or equal to *KPERPM1*.
Condition #4 - Forced Power Enrichment Mode.
Satisfying the criteria of this Condition will force power enrichment in the event that
EST is disabled due to Malfunction Code 42 or operation in backup spark mode.
1. manifold Absolute Pressure (MAP, selected according to the installed sensor, as
defined above) less than or equal to *KPEMAP1*, and,
2. EST disabled, and
3. MAP greater than *KPEMAP4Z*, and
4. Engine speed greater than *KPERPM4Z*
Thoughts on making these changes?