I've used those as wellUsing a turbosmart iwg actuator and a MAC valve, I've been successful at calibrating internal gates for flex fuel setups that can run low boost for gasoline and high boost for E85 using only the duty cycle from the ECU for control. This particular car was able to run close to 30psi using the same hardware that ran as low as 11.8psi. This is using the ECUGN boost controller logic, configured to slew closed loop boost targets based on ethanol content. This logic is configurable, and can be based on any number of different inputs besides ethanol content. Gear, VSS, or a hardwired switch for example.
Some snippets from the same car showing the wastegate / boost pressure responding to duty
at 0% boost duty 11.8psi, gasoline
View attachment 395521
45% and 18.3psi
View attachment 395523
55% yielding 21.8psi
View attachment 395524
and at 67% boost duty 24.5psi on E85 (sorry about the tire spin)
View attachment 395522
We think alike
Made custom bracketing to give more control/leverage over the gate with internal duel port
Was able to run 50psi of boost.
lasted a good while till heat/backpressure and bracketing fatigue lead to loss off the control in boost on this particular car.
The electronic controller sensitivity vs adjustments response time showed a gap.
Switched to external gate and co2 and 0 issues as long as the bottle is filled
The internal gate just did not react as fast as the external if multiple stages of ramps were in play and internal could not lower boost low enough with rpm leave to adapt to multiple surfaces on a higher hp level being applied over time in terms of hp over distances is what we found over extensive testing.