One feature-set demanded of it by the most expert of users, is closed loop boost control.


Closed Loop uses the target boost table to reference what the tuner would LIKE the manifold pressure to be at a given RPM/Throttle Position. It then uses a PID algorithm (as set by the PID settings) to achieve this by varying the valves duty between the Min/Max duties in real-time.


Tuning the closed loop boost control is very much like tuning the idle control - find a ‘P’ value that is low enough to not cause oscillations, but fast enough to give good response - we have found 0.5-0.9 to be good settings for most after-market valves. Opening a Histogram view of manifold pressure can be helpful for this tuning process.


The settings below are excellent for the boost control kit we offer on line when using a TD04 Turbo, and the target boost table shown gives around 0.5 Bar of boost early on, raising to 0.70 Bar later in the revs at WOT, slightly less at part throttle.


CL Req Boost Delta - closed loop doesn't get activated until MAP gets within this value from target. This is to prevent the PID windup from targeting a value that's impossible to get in those conditions

Note that the numbers in the table represent target absolute manifold pressure.