Ricco Posted February 16 Report Share Posted February 16 Hi, I've been playing with and trying to learn/understand Boost control but I'm getting some odd results, or at least ones that I cannot logically figure out. I tried to follow the "Closed Loop Boost Setup Guide" in the help file but I just wasn't able to derive the expected results. Here is my list of questions I've come up with. Why can't I ever seem to hit 180kpa? Whenever I adjust the WGDC values to provide more boost, I just seem to hit ignition cut but never boosts more than 170-175ish. Why is the WGDC sometimes different to the 'Boost Base DC' even with the PID's zero'd? I thought with PID's zero'd, WGDC would always just use the WGDC Table, once it hits stage 2 boost control (assuming trim tables are not coming in to play)? I'm getting random Boost spikes. I've seen it jump over 100kpa in 1/1000th of a second which seems implausible.. Could this be a symptom of an old/failing/bad stock Map sensor? I understand that Ignition cut is kicking in because of the boost spikes but I'm also sometimes seeing Ignition cut without a boost spike.. I even see Ignition cut, cutting in at ~170-175kpa with a boost target of 180. My MAP limit is 205 and Control range is 15 so Ignition cut shouldn't even come in to the equation until 190kpa? Or am I misunderstanding this somehow? When I use a Boost target that is zero'd out in the WGDC table, I see only spring pressure and everything happens like I'd expect.. The car is just slow I have a bunch of log files from my evening of playing around with the settings but I've tried to limit the uploads.. I think you should see examples of everything I'm questioning in the attached and linked log files.. I also attached my Map file, although I was making some adjustments to it as I went along - Mostly just to Target boost and WGDC Table with PID's zero'd - per the setup guide but I think I have PID's set per the Help file in this map as I just set it there towards the end of my runs. Car is SW20 MR2 with stock Gen2 3SGTE with AFM removed and IAT sensor in place of the CSI. MAC 3 port boost solenoid. Aftermarket Catback. Thanks. https://drive.google.com/file/d/1HXx1EncOBJaSu5iTZduGHXzO0shUDQVN/view?usp=sharing mr2 Boost Control 1-27-23.pclx PC Datalog IgnCut n Bspike ex- 2023-02-15 8;23;24 pm.llgx Quote Link to comment Share on other sites More sharing options...
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