GFB G-Force2 - Manual (Page 8)

The Gain setting controls how fast boost pressure rises during spool-up.
NOTE: the gain setting requires a target “peak” boost to be set up in duty cycle. If you adjust duty cycle
without performing a boost run, the target boost will be 0 and gain will not function.
Gain is adjustable from 0-100, where 0 gives a factory-like spool up, which is basically the “natural” rise rate of the
turbo system. A setting of 100 will attempt to make boost rise as fast as the turbo system is capable of by
delaying the opening of the wastegate.
Of course it may then be tempting to assume that the obvious setting would simply be 100 for fastest possible
spool-up, but in practice this will almost certainly result in an overshoot (boost spike), because the wastegate
needs time to move and curb the turbo’s enthusiasm!
Every turbo system is different, and some will handle more gain without noticeable spiking, whilst others may
require a lower gain setting. Note that gain is optimum when boost pressure rises as fast as possible WITHOUT
spiking.
1.
Make sure duty cycle has first been adjusted and peak boost set, as per page 7.
2. Select the boost preset that you want to adjust (see page 6), then navigate to the “Gain” menu (tap
“MENU” twice from Running Mode) – the screen will scroll “gAIn”, followed by the current gain setting
(default is 0).
3. Set gain to 0, then drive the car in such a way that the boost pressure rises as fast as possible – this is
usually done by flooring the throttle at relatively high RPM.
4. Now increase the gain setting using the up/down buttons, then drive the car again (using the same method
as above to ensure consistency).
5. Note how the boost spool-up rate changes, and continue to adjust the gain setting to achieve the desired
boost response. If you notice that boost starts to overshoot the target, reduce the gain setting until boost
pressure hits the target consistently without overshooting.
6. When done, tap “MENU” to move on to Sensitivity, or hold “MENU” to exit. In either case, the Gain setting
will be saved to the boost preset that you are currently in.
7.
Repeat this procedure for any other boost memories you may wish to set up.
NOTE: the Gain function is automatically turned off when making boost pressure adjustments (in Duty Cycle) so
that you can record the true peak boost, however the Gain setting will be reactivated when you return to Running
Mode.
You may find it necessary to re-adjust the Gain setting after changing the boost pressure.
8 - setting the boost pressure
Gain