BoonDocker ARCTIC CAT: HIJACKER 2.0 - Manual (Page 7)

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This menu displays max and peak boost pressure
STATS - MAX
STATS - PSI MAX/Peak
EFI TUNING SUGGESTIONS
Pressing SEL, Up-Arrow, or Down-Arrow from the Run screen will go to the next Stats screen which is the Max screen, display-
ing max RPM, Duty Cycle In from the sled’s ECU, and Duty Cycle Out to the injectors.
MAX 7620 Max RPM
DCIn 65 Max Duty Cycle Input from Sleds ECU
DCOut 83 Max Duty Cycle Output from Control Box to Injectors
Maximum duty cycle is useful to detect at what boost you are about to run out of injector capability (e.g., over 95%), leading
to a lean condition. These max values will be saved so they will remain the next time this screen is displayed, even if the box is
shut off and re-powered. Peak values or “spikes” are filtered by finding the average during a certain time-window. Therefore, a
maximum must be held for at least 1 second to be recorded and displayed properly.
Use the arrow keys to move the cursor between Y and N. Pressing SEL when the cursor is on Y will clear the max values. Press-
ing SEL when the cursor is on N takes you to the next screen: Stats: PSI MAX/Peak.
The HiJacker 2.0™ requires very little tuning, if any. Yet due to variations in sleds and conditions, its default settings cannot be
guaranteed to be correct. To tune your sled, it is highly recommended that you use an air/fuel gauge, an EGT gauge, and read
the plugs. HiJacker™ will not prevent a lean burndown! You must take the proper tuning steps the same as if you were tuning a
carburetor.
Positive RPM fuel numbers add fuel and negative numbers subtract fuel. Be extremely careful with negative numbers. Never
use negative numbers for the PSI setting.
Even though the setting numbers can go quite high, this does not mean you have an effective range that large. At some point
the injector will be at 100% duty cycle (always open) and no more fuel can be added. Your usable adjustment range (max
value) is dependent on how long the ECU already has the injector on. This will vary depending on rpm, throttle setting, temps,
boost, and can be different from sled to sled even of the same model.
Exhaust Gas Temperature gauges can be an effective tuning tool, but they are not a substitute for reading spark plugs and
piston wash and feeling how the engine runs. Use EGTs only as a backup to verify what you see. They can be misleading under
certain conditions and safe readings can vary greatly from engine to engine depending on such things as probe placement,
fuel, timing, pipe design, porting, etc.
MAX 13.2 Max boost (in psig) averaged over about one second
Peak 14.7 Peak boost (in psig) without averaging
Use the arrow keys to move the cursor between Y and N. Pressing SEL when the cursor is on Y will clear the max values. Press-
ing SEL when the cursor is on N takes you back to the main menu