DiabloSport Hemi 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 applications.
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 is 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, then 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, then try lowering spark by 10%. If less than 5 deg, then try 5%. Make another wide open pass and monitor the same pids and basically keep doing this until you see 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, then try to install the factory tune and monitor the knock using it. If knock is still present, then consider switching fuel brands.
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 must 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 must confirm it by pressing enter.
You can now press the esc button 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 the modified tune. Press yes and let the Predator upload the 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.
For tire size, enter the metric tire size displayed on the side wall of the tire (ex.265/75-17) and then press enter to confirm.
You can now press the esc button 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 the modified tune. Press yes and let the Predator upload the new adjusted tune to your vehicle.
For 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 the esc button 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 the Predator upload the 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 the 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)
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