Join Date: Aug 2003
Location: Torrance LA, Camp Patriot Kuwait
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There is also a really good Subi write-up on boost control. Its pretty cool it works, as proper solenoid control calls for a fixed frequency, modulation via PWM- this is why using this method is audibly noisier than EMS and EBC controls with calibrated frequency settings. Can't beat free though haha.
Another cool feature of the EMU I hadn't thought of but read about later was using Inj map 1 and Inj map 2 at the same time via dip switch and front panel selection, then scale the maps so 1 tunes for vacuum and moderate boost, the other from there to high boost, for example full vacuum to 4psi, and 5psi to 20psi, giving you much more granularity in the tune. At the current granularity level of using just one map for a high boost setup (or low boost but you do not scale the map), you can find yourself in the same load cell in partial throttle and WOT (but same RPM and boost level thus the same load cell), and so the partial throttle can have a good air fuel, but at WOT it is leaner. At moderate boost you can scale the map to give you more granularity. I can't really explain what at the same RPM and boost the flow is different, but with variables like VVTi, having a MAF clamp, piggbacking a speed density method to a mass air flow method etc, it shouldn't be surprising.
At moderate boost you can use the above method and have overkill granularity haha.
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