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Modifying Parameters Definitions
Modifying Parameters
Definitions
%Torque Reduction vs RPM: This is Torque reduction as a function of RPM. Turning it off in
conjunction with TM “abuse mode” time limit and upshift torque reduction will eliminate
torque management. However we have noticed that the shift feel when disabling the upshift
torque reduction in trucks and SUV’s is reduced. Therefore, we recommend leaving it ON for
trucks and SUV’s.
Upshift Torque reduction: This is torque reduction control for each individual gear. Turning it
off in conjunction with TM “abuse mode” time limit and %Torque Reduction vs RPM will elimi-
nate torque management. However, we have noticed that the shift feel when disabling the
upshift torque reduction in trucks and SUV’s s reduced. Therefore, we recommend leaving it
ON for trucks and SUV’s.
COT: This is Catalytic over tempeture protection. This parameter is used to cool down the
catalytic converters by adding fuel. This should only be disabled when cats are removed.
COT enable temp: This is the temperature to enable the COT process. Set this high 1200 to
disable it.
P-0420 turn this off when turning COT off
P-0430 turn this off when turning COT off
P0300
Multiple Misfire code. Only disable this code if it is triggered due to larger cam or other such
modifications. This parameter will raise the threshold for triggering the DTC at misfire; it will
not disable the test completely.
The following parameters are tables that dictate the misfire test. You have to turn ALL off in
order to completely disable the false P0300.
Misfire Low Rev
Misfire Low Cyl.
Misfire idle Cyl.
EGR
The EGR group contains “P” code disable for EGR related codes.
O2 sensor
The O2 sensor group contains “P” code disable for rear O2 sensor related codes.
Injector Slope: Determines the injector size and is used when correcting long term
fuel trims.
Injector change: To properly set up injector size, you have to multiply the (current
slope x injector % change). Example: changing #24 to #30 (30-24)/24*100=
25. Multiplying the entire slope by 25% will get you in range.
Determining long term fuel trims: Long term fuel trims are an accumulated value
of fuel added or subtracted during closed loop operation. These values should be
in the 0 to -2 range.To verify and tune for long term fuel trims, drive the vehicle for
30min or until warmed up, and monitor long term fuel trims. Get an average value.
The easiest way to accomplish this is to get on the highway, enable cruise control
and drive at 55mph while monitoring the data. Ideal values should be in the 0 to -2
range.
Now, once you get the average long term fuel trim value:
Positive long term fuel trims: For a positive value, subtract the value in percent in the
Predator injector slope; it is also recommended to lean both fuel tables by the same
percentage.
Negative long term fuel trims: For a negative value, add the value in percent in the
Predator injector slope; it is also recommended to richen both fuel tables by that
same percentage.
Once adjustments are made and the tune is installed, take the vehicle out and verify
the long term fuel trims as previously described. Adjust again if necessary.
Torque Management
PLEASE NOTE: Disabling torque management will put greater stress on your drive
line.
TM Abuse Mode time limit: This is the time in “abuse mode” as related to the func-
tion of temperature. Turning it off in conjunction with Upshift Torque reduction and
% Torque Reduction vs RPM will eliminate torque management. However, we have
noticed that the shift feel when disabling the upshift torque reduction in trucks and
SUV’s is reduced. Therefore we recommend leaving it ON for trucks and SUV’s.
