kruftindustries
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« on: March 08, 2021, 02:41:52 AM »
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THREAD RENAMED TO PREVENT CONFUSION
TLDR: Started the thread with one of the less well documented binaries and just about every part of the engine changed from stock at the same time. Initial question was a load path issue along with wastegate spring pressure, then a cam chain tensioner causing problems.
If you enjoy tuning your 1.8t via the process of elimination, this is the thread for you.
I'm having some issues after swapping a dying k04 with a 2860. I used to be able to get spikes of around 18psi and taper off with the k04 but this guy seems to spool up a little later and I would like to try pressures that would not be possible with the old turbo. I don't think LDRXN is the issue, maybe KFLDHBN? I don't know the address for that map in my binary. Another issue seems to be fueling, The fuel filter is new and i don't think the pressure drops significantly under load but it doesn't reach 160% load in the first place so not sure. I intend to work on the PID tuning, I started on the I table for higher duty at low rpm to spool faster but not sure how to rectify that balooning overshoot once it gets there. Can someone point me in the right direction? I don't even hear the turbo spooling or get any surge when I let off the pedal like I used to and I was expecting it to be a lot worse lol
550cc@4bar
8.5:1CR 81.5mm
stock MAF, haven't seen more than 175g/s
I tried the 5120 hack with the 4b0906018ch 360101 and got lots of weird issues like requested pressure 1/2 what it should be and some inverse response to torque request at part throttle. That might be a different thread for another day but it would be nice to get over with if someone could point me in the right direction, the map definitions are a little scarce for this bin and I'm afraid to try finding the smaller tables/scalars on my own after some exciting results in the past...
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« Last Edit: April 06, 2022, 10:08:47 AM by kruftindustries »
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prj
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« Reply #1 on: March 08, 2021, 03:10:13 AM »
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You're requesting 0.8 bar, your pid is not tuned.
Not sure what you expect?
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kruftindustries
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« Reply #2 on: March 08, 2021, 07:30:20 AM »
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That's my question, I have ldrxn and ldrxnzk asking for much more load than that, why is the boost request capped at 1800-1900millibar absolute? Is it a pressure ratio thing?
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Tomas
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« Reply #3 on: March 08, 2021, 07:45:22 AM »
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As PRJ said, you're not requesting any additional boost. Modifying LDRXN and LDRXNZK is not enough. They are limiters. You need to have a look at KFMIRL, KFMIOP, KFLDRL and KFLDIMX (at least).
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BlackT
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« Reply #4 on: March 08, 2021, 07:57:58 AM »
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That's my question, I have ldrxn and ldrxnzk asking for much more load than that, why is the boost request capped at 1800-1900millibar absolute? Is it a pressure ratio thing?
Did you read S4 tuning wiki? |
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kruftindustries
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« Reply #5 on: March 08, 2021, 09:00:24 AM »
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Awesome thank you guys, was assuming the load was a symptom not the cause, it's been a few years since I messed with this car.
Is it possible to scale the KFM /KFL maps to equate a larger actual load with lower indicated load (ideally without scaling maf and everything else)? I have tiptronic so over 399 calculated torque = violent downshift.
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nyet
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« Reply #6 on: March 08, 2021, 10:28:13 AM »
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Awesome thank you guys, was assuming the load was a symptom not the cause, it's been a few years since I messed with this car.
Is it possible to scale the KFM /KFL maps to equate a larger actual load with lower indicated load (ideally without scaling maf and everything else)? I have tiptronic so over 399 calculated torque = violent downshift.
That statement makes zero sense. Either fix your load req path, fix the 5120 hack if it's broken, or go back to stock pressure scaling and stay under 21 psi. Start by re-rereading the s4 wiki and logging all of the req load limiters. |
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« Last Edit: March 08, 2021, 10:30:44 AM by nyet »
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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kruftindustries
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« Reply #7 on: March 08, 2021, 10:52:21 AM »
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No 5120 on this map, I want <21psi. Tiptronic requests load reduction during shifts and ecu sends calculated torque values to it. Doesn't the torque value the me7.5 sends to TCM over canbus get calculated from the load? When I adjust KFMIRL this value torque sent becomes higher and causes problems with the transmission kicking out of gear. I am trying to find a way around this without doing a manual swap or maf scaling.
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kruftindustries
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« Reply #8 on: March 08, 2021, 11:17:18 AM »
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On the 5120 subject, my issues were weird part throttle which I think were caused by messing with something 1013 related, and the question I had about that is should the requested pressure be half of the MAP measured value or should they both be halved i.e. 440mbar instead of 980mbar at idle for requested and actual.
I think I can figure out the load I just wanted to make sure my only options to prevent the transmission torque downshift were either scaling the MAF or having less load in the first place. Maybe there is a smarter way
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prj
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« Reply #9 on: March 08, 2021, 11:30:47 AM »
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Your problem is not IRL IOP, your specified load is high enough.
Leave those alone.
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kruftindustries
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« Reply #10 on: March 08, 2021, 12:24:18 PM »
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I admit the title is a bit misleading, the goal jokes aside is to make some power without the ecu telling the transmission how much. Unless you were serious Prj? Do you get what I'm trying to do and is it possible?
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_nameless
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« Reply #11 on: March 08, 2021, 07:55:49 PM »
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I admit the title is a bit misleading, the goal jokes aside is to make some power without the ecu telling the transmission how much. Unless you were serious Prj? Do you get what I'm trying to do and is it possible?
I made some changes to your file relating boost control, target fueling, ignition timing, load scaling and a few other changes. Also, switched cwmdapp to 8. that changes boost control to run off a single table. use this to get fueling right then switch close loop pid back on and tune that. .82 lambda request at full load (using bts fueling) max ignition advance at full throttle is 15* by redline. ldrxn is use as a "boost cap" (load cap) atm. if youre on stock maf you will pin the maf sensor and need a larger housing. |
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Giving your mom a tuneup
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kruftindustries
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« Reply #12 on: March 08, 2021, 11:02:47 PM »
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Considering the previous replies and my first -1 karma receipt today, and the fact that nobody has told me to "get rid of your slushbox" I partway expect this will brick the ecu lol. If this is genuine thank you, I will investigate. On the subject of previous replies, I lost about an hour changing the boost I and D tables, logging and trying again before I realized the wastegate pressure cracks at 14psi. Wasn't there a map or two that compensates for that? Maybe I should adjust the wastegate instead
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fknbrkn
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mk4 1.8T AUM
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« Reply #13 on: March 09, 2021, 04:04:44 AM »
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Just read the wiki
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kruftindustries
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« Reply #14 on: March 09, 2021, 06:50:48 AM »
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Yes found them, KFVPDKSD/E. Marty, can you tell me what maps/functions are at the following addresses? Attached is where I had boost kind of where I wanted yesterday with your pressure ratios copied over, haven't had time to try the rest yet.
13583-13587
19bc5-193cf
1f368,1f369
1fc46-1fe3b
8cda8-8cdb7
fffe0-fffe5
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