Turbo option on AEB software

[pyro225]

After figuring out my issue with the cat being a collapsed cat I’ve noticed that the king software has a tickbox inch the main screen for ‘turbo’ silly question what does it do? Mine is ticked and is supercharged I wondered if it was to eliminate turbo lag somehow which isn’t really an issue in supercharged cars so could it be hampering me?

[LPGC]

Which version of King software are you using? Is it an AEB2568, an AEB2001, or a monoplug ECU?

On systems that feature the 'join the dots' method of visualising calibration the turbo option moves the maximum manifold pressure reading (usually on Y axis) from 1 bar (atmospheric pressure) to above 1 bar (how much above 1 bar depends on which system)... But King doesn't do join the dots.

Firmware of some systems is programmed to prevent switching from petrol to LPG when the engine is under high load (close to 1 bar / atmospheric pressure on a normally aspirated engine) but 1 bar might only be partial load on a turbo so setting the turbo option might disable the switching prevention and allow the engine to switch to LPG when manifold pressure is at atmospheric pressure. Ticking the Valvetronic or Multiair box will also (at least) allow engines to switch to LPG when manifold pressure is at atmospheric pressure and depending on system may do other things too, such as adjust the way pressure readings and pressure compensation work.

Don't usually see this on ECUs but obviously a manifold pressure reading of above atmospheric pressure on an engine that couldn't possibly have higher than atmospheric pressure manifold pressure (because it isn't turbo'd or supercharged) could only point to an incorrect pressure reading and therefore to a broken pressure sensor, so if a system does report such errors ticking the turbo box would make it expect higher than atmospheric pressure readings and therefore not flag an error for positive manifold pressure readings.

Some of the King stuff allows you to set aimed for fuel trims (in case of connecting to OBD) and setting a turbo box might make it expect open loop operation over a wider range of engine mid to high load operation.

Some systems like King can report 'nozzles too small/big' during autocal. For a given bhp if an engine is turbo'd the nozzles can usually be a little bit smaller than compared to a normally aspirated engine, so setting the turbo option could effect the nozzles size report. Also, some systems have a 'base map' used as template during autocal... and the slope of the map might be expected to be a bit steeper on a turbo'd engine (for the same reason as we can use smaller nozzles).

Turbo option boxes should normally be ticked if the engine is turbo'd or supercharged, nothing to do with turbo-lag, usually related to at least one and usually a combination of the points I've said above.

[pyro225]

Thanks for the detailed response!