RENOxDECEPTION
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« on: August 13, 2020, 11:49:30 PM »
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Still very new to this, I've been having some help from a forum member here to dial in my boost with feed forward, and got it pretty close to where it needs to be, need to widen the range of imx/drl for a revision soon. Issue is, occasionally, during cruising or low load areas, I will lose throttle response and have to key off / key on and then it works immediately again. 1.8t with upgraded rods k24 7400 turbo 1000cc ev14's @ 4 bar fmic walbro 450 s4 maf sensor Attached is my log file exactly when it occurred (i truncated it because I was trying to recreate the issue, it was originally a 55mb file). It happens right around the 450 to 550 sample in the log Hopefully I was logging the correct variables at the time to figure this out and give me somewhere to look. I think I had this happen before on my other car and it was wiring to the throttle body, but that was a fairly stock car. Now that I've made all these changes and it's happening leads me to believe I fucked up somewhere. So has anyone had this happen? ORI bin in robs post here: http://nefariousmotorsports.com/forum/index.php?topic=1204.0I need to mention that I pulled DTC's and got the following, but it doesn't make sense with the maf or torque monitor because it happened at such low loads it's not like I was exceeding them at the time. Yes I know this needs to be addressed through IOP/IRL or reading the s4 wiki on torque monitoring again. http://wiki.ross-tech.com/wiki/index.php/16487/P0103/000259http://wiki.ross-tech.com/wiki/index.php/17963/P1555/005461http://wiki.ross-tech.com/wiki/index.php/17743/P1335Maps I've changed: kfzwmn axis kfzwmn varient axis kfldrapp lddimxn -> to 1's mlhfm (s4 maf housing, a4 sensor) kffdlbts kfldbts lamfa tabgbts (actually not, when i modify it i noticed fuel request follows lamfa, need to look at this more, but bts is working for now) ldrxn ldrxnzk kfldimx kfldrl kfldrq2 kfzwop/2 axis kfmiop kfmirl temin teminva tvub fkkvs krkte kfzw/2 axis + lower percent in high boost areas kfdzk axis lc+nls manually |
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« Last Edit: August 13, 2020, 11:58:40 PM by RENOxDECEPTION »
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nyet
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« Reply #1 on: August 14, 2020, 12:25:07 AM »
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You can clearly see rl going way over rl_sol
I'm seein a ton of ps_w vs pdvdks_w variation so I'm guessing your MAF is scaled very wrong, so load is reading much higher than it should be.
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RENOxDECEPTION
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« Reply #2 on: August 14, 2020, 12:37:54 AM »
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Thank you, nyet.
I'll rescale my mlhfm and see if I can get it dialed in correctly.
Do you think that could cause a complete disconnect from throttle control?
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nyet
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« Reply #3 on: August 14, 2020, 12:47:09 AM »
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Thank you, nyet.
I'll rescale my mlhfm and see if I can get it dialed in correctly.
Do you think that could cause a complete disconnect from throttle control?
Yes, overscaling MAF by 20% will definitely cause a ton of torque intervention. Safer to underscale than overscale; also less likely to hit the ps_w limit, which causes all sorts of other issues. Is your KRKTE at theoretical? If you pull 20% out of your maf, KRKTE will have to change accordingly. If KRKTE is then 20% out of theoretical, then something else is very wrong. |
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RENOxDECEPTION
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« Reply #4 on: August 14, 2020, 01:42:54 AM »
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So I scaled my MAF before I installed my turbo setup, I figured since i measured the housing directly and used the scaling program for bosch sensors that it would be correct. Could it be because my maf sensor is so close to the filter that it's reading high?  full size: https://i.imgur.com/INo7HIh.png |
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RENOxDECEPTION
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« Reply #5 on: August 14, 2020, 03:06:02 AM »
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Is this better? EPC still popped on on my test drive  |
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RENOxDECEPTION
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« Reply #6 on: August 14, 2020, 06:57:22 PM »
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Think I've figured it out.
To get my n75 dc to 95% during turbo spool up, I set my LDRXN to pretty high values, but it is not requesting any boost at low throttle pedal %'s, but the turbo was still spooling slightly and deviating from the requested amount, torque intervention would see this deviation, and cut throttle response. Does that sound right?
You can see this at the end of the 170714 log attached, which immediately cut throttle and I ended the log.
So this issue is related to my understanding of boost pid i guess, ha.
speaking of, I did some more logging and worked on my IMX/DRL some more, I more or less have boost under control, still needs some work but it's better than it was before, can be seen in the 180509 log attached.
also pretty sure i fixed the maf as per above.
It's a wideband ecu so I don't know if that has an effect on my krkte/fkkvs, but fueling still seems accurate, going to have to start over with fuel logging and adaptation values to be sure
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« Last Edit: August 14, 2020, 07:21:30 PM by RENOxDECEPTION »
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nyet
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« Reply #7 on: August 14, 2020, 10:38:58 PM »
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Good sleuthing, that all sounds reasonable.
Don't depend entirely on wb, but rather, just use it to tell you how close your MAF/fueling is (feed forward component)
I will look at your log time permitting and hopefully give you some feedback.
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nyet
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« Reply #8 on: August 15, 2020, 12:53:39 AM »
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Actually, that still doesn't sound right; mimax comes directly from ldrxn, so you actually want that to be higher than actual torque.
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RENOxDECEPTION
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« Reply #9 on: August 15, 2020, 04:29:47 PM »
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How can I adjust requested boost at part throttle?
My turbo is gaining 6psi (wg cracking pressure) and as soon as it gets past a certain point, it triggers torque intervention.
I don't think I'm logging the correct addresses for these:
edit, never mind, they seem to work.
mibas_w , {} , 0x382528, 2, 0x0000, {%} , 0, 0, 0.00152588, 0, {indicated basic torque}
mizsolv_w , {} , 0x382510, 2, 0x0000, {%} , 0, 0, 0.00152588, 0, {ind. torque for an ignition timing intervention before torque limiting}
misolv_w , {} , 0x38250E, 2, 0x0000, {%} , 0, 0, 0.00152588, 0, {optimum indicated torque}
and I also don't have mimax.
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« Last Edit: August 15, 2020, 08:46:05 PM by RENOxDECEPTION »
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RENOxDECEPTION
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« Reply #10 on: August 17, 2020, 01:43:48 AM »
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Log with those three variables added.
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nyet
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« Reply #11 on: August 17, 2020, 09:50:16 AM »
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You want torque intervention. The whole point is the ECU closes throttle because it can't open the wastegate below cracking pressure.
What you don't want is a DTC, which is a different story.
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RENOxDECEPTION
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« Reply #12 on: August 21, 2020, 11:31:27 PM »
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Well figured it out; reverted to a stock irl/iop and only adjusted the higher load areas.
No more epc.
Also figured out my imx/drl and am no longer over boosting.
Thanks for the help nyet, I don’t know when I would have realized my maf was incorrectly scaled, but car is running great. Now I can work on advancing timing.
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« Last Edit: August 21, 2020, 11:38:04 PM by RENOxDECEPTION »
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RENOxDECEPTION
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« Reply #13 on: August 21, 2020, 11:35:48 PM »
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Log for your critique.
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nyet
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« Reply #14 on: August 22, 2020, 12:48:50 AM »
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That looks pretty damn good! Well done.
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