U7198 Predator Adjustment parameters Explained

[Reserector]

Credit goes to Gene Wolf on Corvette Forum for posting this. http://www.corvetteforum.com/forums/c5- ... 1560706592


Here are additional descriptions of the parameters, assuming you have part number U7198:

Axle Ratio:
Allows user to configure new rear end gear ratios, to correct speedometer and in corvette correct shift action.
Additional parameters to adjust for gear changes:
When changing rear end gears on all vehicles it is recommended that the following changes are made as well to ensure proper operation of the transmission.
Change the MPH upshift and downshift points the same percentage as gear change. For a higher gear ratio reduce mph and for a lower gear ratio increase mph. Ex. 3.42 to 3.73, equals roughly a 10% change in gear ratio size.
Change the MPH upshift vs. TP the same percentage as gear change.
For a higher gear ratio reduce mph and for a lower gear ratio increase mph. Ex. 3.42 to 3.73, equals roughly a 10% change in gear ratio size.

Gear Ratio:
Gear ratio adjustment, trucks,SUV and f-body require user to slide the scale to new gear ratio. Corvette will ask user to enter current gear ratio then new gear ratio so it can calculate the proper pulses per mile."

Power enrichment:
Fuel adjustment when in PE(power enrichment mode) the Predator allows for a 20% increase or decrease. ,
PLEASE NOTE: The display in Predator will show a positive value for leaner and negative value for richer, one might think it is backwards but it is not, the fuel table in GM vehicles is based on lambda where 1 is equal to stoich 14.7:1 and any value higher is richer and lower is leaner",
WOT Fuel 2k-4k, Power enrichment (fuel) modification between 2000-4000 rpm
WOT Fuel 4k-7k, Power enrichment (fuel) modification between 4000-7000 rpm

Spark:
Timing adjustments are made based on % and the predator allows user to add or subtract 20% of timing in respective field.
When adjusting timing it is recommended that user monitors the spark parameter and knock retard parameter in the live data menu of Predator. The knock retard value should always be zero, if it is not it indicates how much timing is being pulled due to knock(detonation).
Spark 1k-1.8k, Timing adjustment between 1000-1800rpm, this adjustment occurs in low load (tip-in) section of timing table as well so proper monitoring of knock retard is highly recommended when adding timing using this parameter.
WOT Spark 2k-4k, Timing adjustment between 2000-4000rpm, high load (Wide open throttle) only.
WOT Spark 4k-7k, Timing adjustment between 4000-7000rpm, high load (Wide open throttle) only.

Shift Time:
This adjusts the duration time of a shift.
1->2 Normal, Shift time 1st to 2nd gear in normal mode, this is set at optimum settings in the default Predator tune, which is .02 seconds.
2->3 Normal, Shift time 2nd to 3rd gear in normal mode, this is set at optimum settings in the default Predator tune, which is .02 seconds.
3->4 Normal, Shift time 3rd to 4th gear in normal mode, this is set at optimum settings in the default Predator tune, which is .02 seconds.
1->2 Tow/Haul, Shift time 1st to 2nd gear in tow/haul mode, this is set at optimum settings in the default Predator tune, which is .02 seconds.
2->3 Tow/Haul, Shift time 2nd to 3rd gear in tow/haul mode, this is set at optimum settings in the default Predator tune, which is .02 seconds.
3->4 Tow/Haul, Shift time 3rd to 4th gear in tow/haul mode, this is set at optimum settings in the default Predator tune, which is .02 seconds.

Upshift MPH:
1->2 Normal, 1st to 2nd gear upshift MPH mark, the vehicle must see this MPH before allowing a RPM shift under wide open throttle conditions, in normal trans mode.
2->3 Normal, 2nd to 3rd gear upshift MPH mark, the vehicle must see this MPH before allowing a RPM shift under wide open throttle conditions, in normal trans mode.
3->4 Normal, 3rd to 4th gear upshift MPH mark, the vehicle must see this MPH before allowing a RPM shift under wide open throttle conditions. If this parameter is maxed out from factory, it is not being used by the vehicles PCM, in mormal trans mode.
1->2 Tow/Haul, 1st to 2nd gear upshift MPH mark, the vehicle must see this MPH before allowing a RPM shift under wide open throttle conditions, in tow/haul trans mode.
2->3 Tow/Haul, 2nd to 3rd gear upshift MPH mark, the vehicle must see this MPH before allowing a RPM shift under wide open throttle conditions, in tow/haul trans mode.
3->4 Tow/Haul, 3rd to 4th gear upshift MPH mark, the vehicle must see this MPH before allowing a RPM shift under wide open throttle conditions. If this parameter is maxed out from factory, it is not being used by the vehicles PCM, in tow/haul trans mode.

Downshift MPH:
2->1 Normal, 2nd to 1st downshift MPH mark, this MPH must be seen in order for transmission to allow a downshift, in normal trans mode.
3->2 Normal, 3rd to 2nd downshift MPH mark, this MPH must be seen in order for transmission to allow a downshift, in normal trans mode.
4->3 Normal, 4th to 3rd downshift MPH mark, this MPH must be seen in order for transmission to allow a downshift. If this parameter is maxed out from factory, it is not being used by the vehicles PCM, in normal trans mode.
2->1 Tow/Haul, 2nd to 1st downshift MPH mark, this MPH must be seen in order for transmission to allow a downshift, in tow/haul trans mode.
3->2 Tow/Haul, 3rd to 2nd downshift MPH mark, this MPH must be seen in order for transmission to allow a downshift, in tow/haul trans mode.
4->3 Tow/Haul, 4th to 3rd downshift MPH mark, this MPH must be seen in order for transmission to allow a downshift. If this parameter is maxed out from factory, it is not being used by the vehicles PCM, in tow/haul trans mode.

Upshift RPM:
RPM shift point that dictates at what rpm to shift into next gear under wide open throttle conditions.
1->2 Normal, 1st to 2nd gear upshift RPM, in normal trans mode"
2->3 Normal, 2nd to 3rd gear upshift RPM, in normal trans mode"
3->4 Normal, 3rd to 4th gear upshift RPM, in normal trans mode"
1->2 Tow/Haul, 1st to 2nd gear upshift RPM, in tow/haul trans mode."
2->3 Tow/Haul, 2nd to 3rd gear upshift RPM, in tow/haul trans mode."
3->4 Tow/Haul, 3rd to 4th gear upshift RPM, in tow/haul trans mode."

Upshift MPH vs TP:
These parameters will allow user to adjust the mph shift point based on throttle position, these shift points are used under part throttle conditions.
The Predator will allow for a % increase or decrease in mph.
1-2 Normal, 1st to 2nd gear shift mph table in normal trans mode.
2-3 Normal, 2nd to 3rd gear shift mph table in normal trans mode.
3-4 Normal, 3rd to 4th gear shift mph table in normal trans mode.
1-2 Tow/Haul, 1st to 2nd gear shift mph table in tow/haul trans mode.
2-3 Tow/Haul, 2nd to 3rd gear shift mph table in tow/haul trans mode.
3-4 Tow/Haul, 3rd to 4th gear shift mph table in tow/haul trans mode.

WOT pressure:
Shift pressure adjustment under wide open throttle.
2nd Normal, 1st to 2nd gear shift pressure under wide open throttle, in normal trans mode.
3rd Normal, 2nd to 3rd gear shift pressure under wide open throttle, in normal trans mode.
4th Normal, 3rd to 4th gear shift pressure under wide open throttle, in normal trans mode.
2nd Tow/Haul, 1st to 2nd gear shift pressure under wide open throttle, in tow/haul trans mode.
3rd Tow/Haul, 2nd to 3rd gear shift pressure under wide open throttle, in tow/haul trans mode.
4th Tow/Haul, 3rd to 4th gear shift pressure under wide open throttle, in tow/haul trans mode.

Part throttle shift pressure:
Shift pressure under partial throttle conditions.
2nd Normal, 1st to 2nd gear shift pressure under partial throttle, in normal trans mode.
3rd Normal, 2nd to 3rd gear shift pressure under partial throttle, in normal trans mode.
4th Normal, 3rd to 4th gear shift pressure under partial throttle, in normal trans mode.
2nd Tow/Haul, 1st to 2nd gear shift pressure under partial throttle, in tow/haul trans mode.
3rd Tow/Haul, 2nd to 3rd gear shift pressure under partial throttle, in tow/haul trans mode.
4th Tow/Haul, 3rd to 4th gear shift pressure under partial throttle, in tow/haul trans mode.

Rev Limit:
Rev Limit Increase/decrease, allows for a 1000rpm increase or decrease in rev limiter, ensure that the rev limit is raised if the shift RPM is raised so it will not interfere with a shift.

Speed Limit:
Speed limiter adjustment, allows for a max of 125mph in trucks/SUV’s and 175mph in f-body vehicles.
With out ETC, speed limiter for vehicles equipped without electronic throttle.
With ETC, speed limiter for vehicles equipped with electronic throttle.
Speed Limit, default speed limit, this parameter is usually maxed out in all applications, if it is not it should be raised if an increase in top speed limiter is desired.

Actual Wheel Size:
Allows user to adjust for a change in tire size, user must enter current(original) tire size and actual(new) tire size to allow Predator to adjust the speedometer.
PLEASE NOTE: Tire sizes must be entered in metric sizes, if the tire size is not displayed in metric on tire there is an excel sheet available for download on our website in the download section that will convert the standard values to metric size.
Actual Wheel Size, adjust tire size to correct speedometer.

Idle RPM:
Allows user to adjust the desired idle rpm, the Predator allows for a 300 rpm decrease and a 500rpm increase in idle rpm. The adjustments are based on what gear is selected and if the vehicle has the air conditioning on or off. For manual transmission vehicles only the drive parameter is used.
Drive A/C OFF, idle in drive with the air conditioning off.
Drive A/C ON, idle in drive with the air conditioning on.
Neutral A/C ON, idle in neutral with the air conditioning on.
Neutral A/C OFF, idle in neutral with the air conditioning off.

Torque Management:
The torque management group will allow user to disable torque management completely. Some adjustments to torque management have been done in the default Predator tune and to completely disable the torque management user must turn the following three parameters off.
PLEASE NOTE:
Upshift torque reduction should only be turned off on passenger vehicles only as the effect of turning it off on trucks and SUV’s leaves a undesired delay when shifting from 1st to 2nd under wide open throttle.
TM Abuse mode time limit: parameter indicating how long the vehicle should stay in the torque management mode, this should be turned off. Turning it off will set the table to 0 seconds.
% Torque Reduction vs RPM: This is the applied torque reduction versus rpm and should also be turned off, turning it off will set this table to zero which will apply zero torque reduction during a shift.
Upshift Torque Reduction: This is desired torque reduction applied by gear. This should be turned off in passenger vehicles only, it does not leave the desired effect in trucks and SUV’s. Turning these tables off will set them to zero and thus request zero torque management during a shift.




Injector Slope:
Use to determine the injector size and also to correct the long term fuel trims.

Injector change: To properly set up injector size it is recommended that you multiply the current slope by injector % change.
Example:
#24 to #30
(30-24) / 24 * 100 = 25%
so multiply the entire slope by 25% to get you in the ballpark.
Long term fuel trim correction:
Determining long term fuel trims: Long term fuel trims are an accumulated value of fuel added or subtracted during closed loop operation.
To verify and tune for long term fuel trims, drive the vehicle for 30 minutes or until warmed up, monitor long term fuel trims and get an average value. The easiest way to do this is to get on the highway, enable cruise control and sit at 55mph while monitoring the data. Ideal values should be in the 0 to negative 2 range.
Once you get the average long term fuel trim value:
o Positive long term fuel trims
For a positive value you subtract that value in percent in the predator injector slope. It is also recommended to lean both fuel tables by the same percentage.
o Negative long term fuel trims
For a negative value you add that value in percent in the predator injector slope. It is also recommended to richen both fuel tables by that same percentage.

Once adjustment is done and tune installed, take the vehicle out and verify the long term fuel trims per previously described method. Adjust again if necessary.

COT:
Catalytic overtemp protection, this should only be adjusted if the catalytic converters have been removed. This will disable the COT strategy and prevent COT from being performed.
COT Enable Temp, this will allow user to adjust at what temperature the pcm will enable the COT strategy, by setting it to 1200 degrees it will never see this temperature and thus never turn on.
P-0420-0430, These two dtc’s(diagnostic trouble codes) will need to be turned off if the vehicle’s catalytic converters have been removed as it will trigger these dtc’s otherwise and a SES(service engine soon) light will appear on the dash.

OBD-II EGR:
This section of parameters will need to be disabled and turned off in order to prevent SES lights to appear when removing the EGR system from the vehicle.
EGR Disable MPH, mph when to disable the egr strategy, set high(increase by 200) to disable.
EGR Enable MPH, mph when to enable the egr strategy, set high(increase by 200) to disable.
The following are dtc codes that needs to be turned off when removing the egr system.
P-0400, P-0401, P-0402, P-0404, P-0405, P-1404, P-1406, P-1409.

OBD-II AIR:
This section of parameters will need to be disabled and turned off in order to prevent SES lights to appear when removing the AIR system from the vehicle.

The following are dtc codes that needs to be turned off when removing the air system.
P-0410 & 412, P-0418, P-1415, P-1416

OBD-II O2 sensor:
This section of parameters will need to be disabled and turned off in order to prevent SES lights to appear when removing the rear 02 sensors from the vehicle.

The following are dtc codes that needs to be turned off when removing the rear 02 sensors.

P-0137, P-0138 & 140, P-0141, P-0157, P-0158 & 160, P-0161,
P-1133, P-1134, P-1153, P-1154

CAGS:
Computer aided gear selection, this parameter allows user to disable the CAGS(skip shift) 1st to 4th gear strategy.
Skip shift, turn the skip shift strategy on or off.

Cooling Fans:
This parameter will allow user to adjust the fan on and off temperatures for vehicles equipped with electric fans. The on temperature should always be higher than the off as the fan on tells pcm when to enable the fan and off tells pcm when the temperature is cool enough to turn the fan off.
Fan 1 ON, temperature when to turn fan one on.
Fan 1 OFF, temperature when to turn fan one off.
Fan 2 ON, temperature when to turn fan two on.
Fan 2 OFF, temperature when to turn fan two off.


Thank you for your interest in DiabloSport!
Stay tuned,
Calvin, a proud member of the DiabloSport Support Team

[mikel]

Nice, good find.

Looks like something Calvin did a long time ago, he was my boss when I started here 10 years ago!

[Reserector]

This already helped me a ton. I adjusted my shift points last night, and it is much nicer. It runs smooth, and feels "stock", which is what I want. I'm going for economy in spite of lower gearing.

I have one shift (2-3) that is reluctant at moderate throttle, even though they were all adjusted by the same percentage. It sort of hangs. Not sure how to weed that out, because with light throttle or heavy throttle, it does not do it. In fact, it only seems to do it when I first start out, whether cold or warmed up. If I hold moderate throttle and let it hang, it shifts after about 5 seconds regardless.

To compensate for a 20% lower gear, I reduced Upshift, Downshift, Upshift RPM vs TP by 20% across the board.

Any thoughts as to what category I should try to tweak first?