12
1. Wastegate Duty
(WG Duty) – Adjusts the solenoid duty cycle in 2%
increments. The higher the duty cycle percentage the higher boost
pressure will be achieved over the base wastegate spring pressure.
When wastegate duty is active, the SCG-1 will display the duty cycle
percentage on the upper right hand corner viewport. Default setting is
4%
Tuning Tip: Start small and work up. Do not increase Wastegate Duty if
Boost/AFR cuts occur. Remedy Boost/AFR cuts before increasing
Wastegate Duty.
Note: Because of flow restrictions, wastegate spring size, and
other factors, not all applications will be able to achieve desired
target boost pressure.
2. Gain –
Ramps up the solenoid Duty Cycle to help with boost pressure
drop at high engine speeds. Gain is calculated as a percentage of what
the current wastegate duty is set at (Max Duty with Gain = (Gain% *
Duty%) + Duty%). For example, if your Wastegate Duty is set at 30%
and your Gain is 50% the SCG-1 will gain up to an additional 15% (Max
Duty with Gain =45%). Gain is triggered 1.5 seconds into active boost
and will ramp up until Max Duty is gained. The SCG-1 will display the
active duty cycle and progressive Gain on the upper right hand corner
viewport when active. Default setting is 0%.
Tuning Tip: Tune your wastegate duty and spring pressure settings
before gain.
3. Spring Pressure (Spring Press)
– Sets the activation pressure for the
solenoid. Set this value at or less than your mechanical spring pressure.
Be aware that setting this value too low may cause boost spikes, setting
it too high may cause an extreme delay in the activation of the solenoid.
Default setting is 4.9 PSI
Tuning Tip: A good starting point is 1 to 2 PSI below the wastegate's
mechanical spring pressure.
4. Boost Cut by Pressure
- This is a safety trigger to cut boost by a
desired wastegate duty percentage at a specific manifold absolute
pressure. There are two setup parameters to trigger this safely cut:
Max
Pressure (Boost Cut Press)
and
Cut Percent (Boost Cut %)
. Max
Pressure (Boost Cut Press) is the maximum manifold absolute pressure
that is safe for the application. Cut Percent (Boost Cut %) is the
percentage of wastegate duty that the trigger will cut when the max
defined pressure is hit. When the safety Boost Cut by Pressure is
triggered, the SCG-1 will display “B Cut” on the upper right hand corner
viewport. Default setting is 8 PSI with a 100% cut.
Tuning Tip: Start with a 100% Cut Percentage.
