DiabloSport :: Gas and Diesel Tuning Systems

DiabloSport Predator

Parameters Explained DCX Predator

DCX Predator parameters explained

We dedicated this page to explain the different parameters that the Predator allows the end user to adjust.
Please note that all parameters listed may not be available on all part numbers.

Vehicle Speed Limiter

Tire size adjustment

Quick Adjust parameters

Cooling Fans AC off

High MPH HS Fan On:
High MPH High Speed Fan On when ac is off and above 8mph
High MPH MS Fan On:
High MPH Medium Speed Fan On when ac is off and above 8mph
High MPH LS Fan On:
High MPH Low Speed Fan On when ac is off and above 8mph
Low MPH HS Fan On:
Low MPH High Speed Fan On when ac is off and below 8mph
Low MPH MS Fan On:
Low MPH Medium Speed Fan On when ac is off and below 8mph
Low MPH LS Fan On:
Low MPH Low Speed Fan On when ac is off and below 8mph

Cooling Fans AC on

HS Fan On:
High Speed Fan On when ac is on
MS Fan On:
Medium Speed Fan On when ac is on
LS Fan On:
Low Speed Fan On when ac is on

Spark Adjustment

WOT Spark 1k-3.8k:
Allows user to adjust timing +/-10 degrees in the 1000-3800 rpm range
WOT Spark 4k-4.8k:
Allows user to adjust timing +/-10 degrees in the 4000-4800 rpm range
WOT Spark 5k-7k:
Allows user to adjust timing +/-10 degrees in the 5000-7000 rpm range
To properly dial in your timing using the Predator you need to log or monitor the following live data parameters.
Spark, this is your actual timing (in degrees) at any given time.
Knock Retard, this the amount of timing removed (in degrees) due to knock (detonation/ping). The knock sensors can in rare cases pick up other harsh engine noises as well, if this is the case it is recommended to fix the cause of the noise before proceeding.
You basically always want the knock retard to read zero under wide open throttle conditions, it is normal for it to show some KR when stomping on the throttle and also during the shift.
Monitor the spark and the knock retard pids under wide open throttle and see if you have any knock retard, anything higher than 1 should be adjusted in the respective timing range in the Predator , if the knock is severe, 5 deg plus, try lowering spark by 10%, if less than 5 deg, try 5%. Make another wide open pass and monitor the same pids and basically keep doing this until you seen no knock retard.
NOTE: The use of respective grade fuel should be used with tune choice.
91 octane tune will run on 87,89 and 91 octane. The 93 octane (Performance) tune will run on 91 and 93 octane. If severe knock cannot be remedied by adjusting the parameters for it, try to install the factory tune and monitor the knock using it. If knock still is present consider switching fuel brand.
DiabloSport recommends using fuels from the following vendors:
Mobil, Sunoco and Amoco/BP.

Knock Sensors
Disabling the knock sensors can cause severe damage to your engine if used with poor quality or low octane fuels.

Short term Knock sensor enable/disable:
Enable or disable the short term knock sensor.
Long term Knock sensor enable/disable:
Enable or disable the long term knock sensor.

Fuel Adjustment

WOT Fuel 1k-3.8k
Allows user to adjust fuel +/- 20% in the 1000-3800 rpm range
WOT Fuel 4k-4.8k
Allows user to adjust fuel +/- 20% in the 4000-4800 rpm range
WOT Fuel 5k-7k
Allows user to adjust fuel +/- 20% in the 5000-7000 rpm range

Rev limiters

Rev Limiter in Drive
Allows user to adjust the rev limiter while in drive, adjustable up to 7000 rpms.
Rev Limiter in Neutral
Allows user to adjust the rev limiter while in park/neutral, adjustable up to 4000 rpms.

Idle Speed

Idle Speed in Drive AC off
Allows user to adjust the idle speed +/-400rpm in drive with the ac off.
Idle Speed in Drive AC on
Allows user to adjust the idle speed +/-400rpm in drive with the ac on.
Idle Speed in P/N AC off
Allows user to adjust the idle speed +/-400rpm in park/neutral with the ac off.
Idle Speed in P/N AC on
Allows user to adjust the idle speed +/-400rpm in park/neutral with the ac on.

Vehicle Speed Limiter

Allows user to adjust the vehicles speed limiter up to 190mph

Tire size adjustment

The Predator has two different ways to adjust for tire size.
First Method
Enter your original tire size then enter the new(actual) tire size.
The Predator will prompt you to put in your original tire size in metric format (ex. 265/75-17), once entered the Predator will then display your entry and you confirm it by pressing enter.
The Predator will then promt you to put in the new (actual) tire size in metric format (ex.305/50-22), once entered the Predator will then display your entry and you confirm it by pressing enter.
You can now press esc to go back to the main modify parameter menu and if no more adjustments are desired press esc again and you will be asked to install modified tune, press yes and let Predator upload new adjusted tune to your vehicle.
To reset the tire size, you can go to reset parameters and then reinstall the tune.
Second Method
Enter the tire size or the overall tire height
The Predator will ask if you want to adjust it via entering the tire size or by the actual tire height.
Tire size, enter the metric tire size displayed on the side wall of the tire (ex.265/75-17) then press enter to confirm.
You can now press esc to go back to the main modify parameter menu and if no more adjustments are desired press esc again and you will be asked to install modified tune, press yes and let Predator upload new adjusted tune to your vehicle.
Tire height, measure the tire height using a tape measure and enter that measurement in the Predator, then press enter to confirm.
You can now press esc to go back to the main modify parameter menu and if no more adjustments are desired press esc again and you will be asked to install modified tune, press yes and let Predator upload new adjusted tune to your vehicle.
To reset the tire size, you can go to reset parameters and then reinstall the tune.

Quick Adjust parameters

Quick adjust parameters do not require a reflash to take effect, they require a key cycle, these parameters are available in a separate "Quick Adjust" menu item as well as in the modify parameters menu.
User will be asked to cycle key after each adjustment.

ESP mode
Enable or disable the ESP (traction control), NOTE: When disabled the ABS, ESP BAS and (Brake) lights will be illuminated and ABS will not be operational
Reset TCM adaptation
Resets the learned TCM adaptation(instead of pulling a fuse).
Shift Points
Raise shift points by a predefined setting, 5.7L's (1-2 5800rpm, 2-3 6000rpm, 3-4 6000rpm), 6.1L's (1-2 6400rpm, 2-3 6400rpm, 3-4 6400rpm).(N/A on Jeep)
Shift Firmness
Reduces torque management between shifts for a firmer shift , N/A on SRT8 vehicles.
Autostick auto upshift
Enable/Disable automatic upshift when in manual autostick mode, ie. raise your rev limits and you can shift manually at any rpm without the vehicle automatically upshifting (as it would do stock).(N/A on Jeep)

Predator Custom Tuning

Custom tunes are most likely needed if you modified your car, which are available from any CMR dealer.

Click here to find a CMR dealer in your area.

The Predator can hold up to 5 custom tunes made by any CMR dealer nationwide, the upload process is less than 30sec. This makes the predator a valuable product to have. If you tuned your vehicle from stock and like the power your car is producing, most likely you will start adding modifications to your car as time goes on. Good thing you have a predator because u can go to any of our CMR dealers and get a custom tune for your exact modification setup. Your car will run better, faster and get the best gas mileage that can be achieved for that particular modification setup.

Many of your custom tuning questions involving DiabloSport products, they may already be answered in the FAQ section of our website. If not you can post questions and get the answers in 24 hours. Please refer to FAQ or for all your custom dyno tuning needs please refer to our dealer locator to find the
CMR tuning dealer near you.