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About dynoiasi

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  1. Thank you very much for your answer, Adam, I really needed to find out the answer to my question. Regarding the recordings, I forgot to describe what seems important about them. Especially the first one is too long and only contains strong acceleration at around second 40, with some "popping" sounds happening from 49 to 53. The second one has some spikes/pops at around second 4. However in both of them the pops do not sound like I usually hear in knock recordings, like metallic taps that are different from the rest of the sounds, but they are more like random spikes that sound the same like t
  2. Hello everybody, Update on my knock research and a new question: Firstly, it seems like the sound recordings I attached on april 30 were not ok. I think the amplifier input was too high and so clipping occurred which somehow created the pops. I reduced the amplifier gain a little and now the recordings are much cleaner. However I can still hear a couple of pops here and there. The first recording is made with 16 degrees advance and the second one with 14 degrees. They are both filtered with 6 to 6.5khz band pass. What do you guys think? https://1drv.ms/u/s!Amk_BITNgVuBs3sXuVLSgm
  3. Confession time: the hose I thought was going to the wastegate was going to compressor and the other way around I switched them around and now target boost seems to come around 25 % wastegate and controllable. I'm sorry to have wasted your time and to have driven the car in overboost dozens of times while trying to understand what's going on.... unfortunately I was just too sure of how those hoses were connected and I thought of any other complicated explanation but this. So car pulls strong and it seems that soon the tuning will be done. Next priority is getting the cold start dec
  4. It's some sort of filter...From what I saw most of the mac style valves come with such a filter for the atmosphere side. It looks like it's made of pressed copper wires or something. I just blew through it and it gives noticeable restriction, you think that could be the problem? Aren't these filter supposed to be used in such applications?
  5. It's going to be hard to show a photo of the wastegate because it's a bottom mount turbo with internal wastegate and getting to the wastegate is a royal pain... However on short notice I can attach a photo of the solenoid install. It's a funny hack job which I did because I had no 90 degree pipe connector so I used a 'T' and blocked one output with a piece of wood So it's a classic MAC 3 port valve, port 1 goes to atmosphere (image right side), port 2 which should be the common port according to instructions and my own checks goes to the capsule of the wastegate actuator (left of the ima
  6. Ok, I will place here a log file and hopefully you guys have some idea what's happening because I really don't know what to try next. After replacing the boost controller with the MAC 3 port I am back to square 1 and I still can't control the boost. In short what I get is very low boost with 65% WG duty cycle and overboosting with 70%. I disabled closed loop boost control and all the runs are done in top gear on straight road. Otherwise the car runs fine and pulls strong when it is making the right boost. What should be the next step? Measuring the WG pressure with different duty cycles to ens
  7. Ok, so I was doing it wrong because if I clicked "save log" after step 4, I was probably saving just the last section (3-4) which was active at the moment. Might be a useful addition to have a save all button with automatic naming based on system time. Thanks!
  8. I'm using closed loop, so I will use the Idle target trim. Mario, I think you cannot use just the AC step value in closed loop, because the closed loop will decrease the duty cycle back to get to the target RPM value, regardless of the step up.
  9. Thanks, I'll give it another try without normalizing the gear ratio.
  10. Hello, As far as I understand from the help documents, there are 2 strategies that ensure a consistent idle when the A/C compressor kicks in: 1. The fuel trim 2. The Idle up adjustment of the idle base positon table. Is there a way to also increase the idle target RPM when the A/C compressor kicks in? I am thinking of using the "Idle target RPM trim table" and setting the Y axis to "AC request". Would this work? Is this the usual configuration or should this not be necessary? I think what I am trying to achieve is mostly done by the small displacement engines, whereas the b
  11. Hello, Short question: If I click on record log(1), then stop log(2), and then record log(3) and stop log(4) again, will I get a log that contains both pieces 1-2 and 3-4, or will I only get piece 3-4 unless I save before clicking record again? I used to live with the impression that I will get the whole log (1-4) eventually split in 2 sections, but now I am not so sure anymore. The workflow I am trying to achieve is this: drive the car, hit an interesting spot, park it on the side of the road and inspect the log. I do not necessarily want to stop logging while I inspect the cur
  12. Hello, I wonder if there is a known issue regarding this or I am just doing something plain stupid. I searched the forums and even though someone seemed to have a similar problem some time ago, there was no conclusion to that thread. So I learned the gears following the manual procedure and everything worked fine for that run. In runtime values I could see the "Gear" parameter changing as it should while I changed through the gears. Everything worked well for that trip and I made sure to save and store the changes. I even have a log that I attach here which contains the correctly de
  13. This is a 2.5l M50 Bmw engine with thinker head gasket. Still struggling with boost control. It seems that with the values which are required to get decent boost response on higher gears, I overboost badly in 1st and second gear. Is this not strange? Isn't it the norm to have bigger boost in the high gears because the engine has more time to build load? Next thing I'll try is gear dependent wg trim to reduce 1st and 2nd duty cycle around 10%, however doesn't that look strange? Usually you reduce wg DC because of traction problems in low gears, but not because of overboost.
  14. You turn the knife where it hurts The problem with my build is that ridiculously I do not know exactly what turbo I am running All I know is that it is a T3/T4 hybrid with 60mm inducer and 50mm outlet size. I received it from someone I trusted (back then) when I started the build and he said it should be good for aroud 300hp. From then a lot of money flew into the build and I put together a pretty decent setup, however the capability of one of the main blocks (the turbocharger) is still not know to me. Update on my work: I installed the new MAC boost controller and started tweaking it o
  15. About 0.5 bar... Anyway, after I replace the boost controller I might reach the conclusion that after all this is all this turbo can make. I seem to be able to make more boost in low rpm's and low gears, but it looks like the turbo cannot sustain the pressure in high gears and high rpm's.
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