Boxman

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Boxman last won the day on April 20 2019

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About Boxman

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  1. Ostrich completely replaces the ROM chip and is just a ROM emulator afaik, and has capability of live tuning. That would suggest that M4.4 constantly uses flash-rom to get values.
  2. Ah, that helps a lot, I can definitely work with that! I assumed "Ki" was the value in the injector constant field, didn't know it was a lot more intricate. Reverse-engineering it based on logs indeed seems the way to go. Thanks a lot! I'll get on that and will probably deliver ported maps for Megasquirt soon
  3. Been a while - do we know the exact way the ECU calculates load? The formula found in the m4.4 datasheet (Q/(n*Ki), with Q = MAF in kg/hr, n=RPM and Ki=injector constant) doesn't seem to be quite right. I can't reproduce logged values of load from logged parameters and injector constant. Missing a factor 26-27 with a random +- 1 component when just putting that in, so which parameters does the ECU use exactly, and in which units, if anyone knows?
  4. You removed the water cooling from a GT3071R?
  5. Bumping this one, summer is around the corner so I'm going to be running into this 'issue' again. 😄
  6. Question regarding the current state of A/C; have any additional maps pertaining to corrections on fueling/ignition/anything engine related when switching A/C been found in the past years? Ever since I switched to M4.4 (Piet's AC mod) from my M4.3 car, my engine will show weird idling behavior as long as the A/C is on. More precisely, with A/C on, as long as I'm still rolling, but with the clutch depressed, the engine will drop down to 2000RPM exactly and idle there. Only after i've come to a complete stop, the RPM's will drop to normal ~900rpm idle after a second or so. Or i'd have to force the RPM down with with shifting to a higher gear, if I force it to 1000 RPM it will stay there. So when driving with A/C towards a traffic light, or in erratic slow traffic where I clutch&roll a lot, I'll be idling at an annoying 2000RPM most of the time. The one A/C correction table I have right now doesn't seem to do much, zeroing it out gives no change, and it seems like something is actively controlling the idler to target 2000rpm. Sound familiar to anyone?
  7. Cool, I'll message you shortly to see if we can figure something out.
  8. Question to the experienced coders here; would it be possible to add a per-cylinder correction factor on the injector constant? Just a percentage-based multiplication, say 10, maybe 20% either way to keep some resolution in fine-tuning. I've got my per-cylinder EGT set-up now and I think I should be able to compensate with individual injector trims, since they all do differ slightly. I started coding and started with the obligatory C (which is coming along nicely), though reverse-engineering in assembly isn't at a level that would provide any meaningful results yet.
  9. There's also a temp sensor in the air intake ducting behind the glove-box, next to the fan resistor. I'd assume that's what ECC uses for intake-air temp figures.
  10. I mean the emissions-related addons Volvo put on the car, such as the EVAP system that purges excess gas tank fumes. They're not required for operation of the engine, but did you just block them off entirely? Edit; nvm, i see you're planning to but haven't actually put it on an 850 yet. Actually that''s the only additional system that comes to mind - nobody runs SAS or EGR on these cars.
  11. @German850R what aftermarket solution are you using, and how are you dealing with integration of other engine-related systems like the climate control/AC/emissions?