Quote:
Originally Posted by shiv@vishnu
Eugen, I really need your help here. Did you send new logs? Or are you referring to the logs you sent me yesterday (which I posted on this forum a few pages ago)?
Specifically, these:
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Here is a better description:
Quote:
Originally Posted by scalbert
Thanks for the confirmation: I was pretty sure the default state was no boost (my old Typhoon was the opposite; I line blew off the boost control solenoid and I was seeing 30 PSI).
Now for the reason of the question. Everything had been fine for the most part for the last week. I should note I was out of town all of last week so the car was only driven with V2 installed for a few days total. Upon initial testing I was seeing what was expected. Everything was fine so far. Last Friday, the second day I drove the car with V2 installed, I noticed that in the mid range the car was only making a hair over 10 PSI boost. Whereas on Monday (not driven the other days) I would see 12 - 13 PSI in the mid range. This was the prompt for the load based thread I created as it was semi-cool here on Friday morning.
Fast forward to yesterday and today. Yesterday, out of curiosity, and since I know the quality of fuel in the tank, I bumped up the settings to about half way (for each value) to 100%. In other words, if it was 92%, that now become 96%, etc. I ran some logs and timing seemed to be fine although boost was spiking a bit more than I thought it should. A/F ratio also seemed in check. However, today was a different story, at least with boost; no other data was monitored.
Today, I would sometimes see spikes as high as 22 PSI but most of the time it would drop to about 15 PSI. But there was one time it didn't drop so I immediately got off of it. The kicker is that this did not occur 100% of the time; more like about 30%. Also, if I jumped on the throttle in the low revs, about 2000 RPM, and let it build from there, the boost responded correctly. It was only when I jumped fully on the throttle in the 3000 - 4000 RPM range that it would overshoot. Plus, even when slowly rolling on the throttle and no spikes, the peak boost would start climbing to about 17 PSI just before it was pulled back in the 2.0.1 map to below 10 PSI nearing redline. One time it even climbed to near 20 PSI.
I went back home and loaded back in the base 2.0.1 map and went out for some more tests. Although the spikes were less significant, it would still run as high as 20 PSI. And now it would just climb to about 16 PSI when slowly rolling on the throttle. So things were reduced but not where it had been just days before.
Next I dropped the user values by about 5 points across the board and retested. Now things seemed to be getting closer to where it had been. Spikes were down to the 17 PSI range and it would only climb to about 13 - 14 PSI. However, after several minutes things dropped altogether to where I would expect it. Plus, it was not spiking at all now. That is where I left it and planned on monitoring it on the way into the office tomorrow morning.
The below is a summary on the base 2.0.1 map:
- This only occurred about 30% of the time
- Boost spikes were running upwards of 20 PSI
- If I slowly rolled on the throttle, the spikes did not occur
- Boost occasionally climbing to 16 - 17 PSI by 5500 - 6000
- Boost would drop to below 10 PSI near redline, as it should with this map
Now the caveat, power changes were not noticeable. What I mean is that there was no power increase or decrease when the spikes occurred which with other vehicles, would have been noticeable. In fact, I would not know anything was awry unless I was monitoring the gauge. Everything seemed perfectly normal.
Since we have established how the boost control functions, I have to say it is working. But for whatever reason the boost is not dropping as designed except in other places where the duty cycle would be significantly lower. It is almost as though the solenoids or the driver for them are not responding in certain situations. That, or the TMAP input isn't working correctly 100% of the time. I need to pick up a USB extension cable to get logs from the PROcede its self to see what the I/O are doing. Or another thought, the source for the boost gauge (the diverter supply lines) do not represent the same value as seen at the TMAP.
Having programmed many PID control systems (single loops, cascading, etc.) and even some hydraulic systems, I know a thing or two about what is required for closed loop control. The difficulty here is that it works fine the majority of the time and without watching the gauge; everything feels fine even when it does occur. This might be a fun one to track down and yes, I did check all of the lines as much as possible. I even see a solid 22 inHG vacuum when warmed.
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The second picture, where boost climbs up to 13.2psi is exactly this behavior. You don't feel the boost raising.