tadope
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« Reply #15 on: December 11, 2021, 04:54:58 PM »
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Latest update:
still working on boost spike afr. and high boost request at high rpm.
Boost spike:
Is this high afr normal? I was getting nasty boost spikes from my tiny ko4, and i've already done a lot to try and fix it.
but the engine afr doesn't like it at all. Basically if I mash the throttle at low rpm, then the boost quickly spikes up high then settles.
Immediately at/after that intitial spike there will be a big AFR increase. like from 12 to 13, or 11.5 to 12.5, something like that.
I have toned down the physical spike itself a lot by lowering IMX a ton, then raising DRL to flatten it back out. I also loosened the wg screw just a bit. But even so, the AFR issue still persists.
Boost request:
I'll attach a screenshot of my ldrxn compared to my boost request. I've no clue why it should ignore ldrxn so much up top.
Also as I do pulls/runs the requested starts to get higher and higher. all the way up to 18psi range. max should be 15.
Wikis4 mentioned this phenomenon as LDEIAP and TLDIAPN. I'm not sure how much I can lower LDEIAP ??
I'm going to try and read the FR on the subject.
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aef
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« Reply #16 on: December 12, 2021, 03:52:54 AM »
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logs?
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tadope
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« Reply #17 on: December 12, 2021, 02:07:49 PM »
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logs
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aef
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« Reply #18 on: December 13, 2021, 01:22:08 AM »
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What kind of k04 is this? Because your mass air flow is good up top for a k04. Have you faked the mlhfm or something? the spike in afr can be massaged by fkkvs. there is a fixer tool available for this. the goal with this is to calm down lambdacontrol fr_w. log more load variables and dont forget that ldrxn is just the upper limit, its not what you requesting rl ;{EngineLoad rl} rl_w ;{EngineLoad rl_w} rlmax_w ;{EngineLoadCorrected} rlmx_w ;{EngineLoadSpecified} rlsol_w ;{EngineLoadRequested} https://s4wiki.com/wiki/Tuning#Specifying_requested_boostwhat is your goal with the boost? |
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tadope
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« Reply #19 on: December 13, 2021, 06:22:22 AM »
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Oooohhh that explains a lot.
I was actually trying to massage the spike via kfkhfm. Because the s4wiki said to use kfkhfm
For intake nonlinearities (ive a huge tip/cone). Ill try fkkvs instead.
Its stock amu ko4(ko4 023 i think) I pulled all the charge piping restrictions out which saw massive reduction in wg duty cycle up top. Maybe that is causing the good g readings?
My goal with the boos is actually a big one. I want see how powerful the ko4 can be fully maxed out. And with as much assistance as possible towards reducing its heat and overspinning. So at least 20psi up top. Might just stop before the map limit.
But im also running a converted file for maf settings. Imported the stock maf settings from the amu file into a bam file for wideband purposes. I suppose it is “plausible” that mlfhm is incorrect. But the car drives perfectly smoothly. And ltft are only 0-1%
Krkte and tvub are more likely to be off because i have a 4bar also. But that wont effect g readings.
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aef
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« Reply #20 on: December 13, 2021, 10:16:50 AM »
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Okay so amu is narrow band?! and you did a wideband conversion with bam ecu and wideband sensor?
What about vvt and egt sensor? Turbo ist K04-022 without sensor hole i guess.
Your maf reading is way to high i guess. you have mlhfm from aum untouched copied to bam file?
kfkhfm all 1's?
fkkvs all 1's?
attached is a amk log (euro k04 wideband). its not perfect but you can see what the turbo is capable of. I would aim for 1.4-1.5bar during spoolup and see what you can squeeze out at top end.
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tadope
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« Reply #21 on: December 13, 2021, 11:34:59 AM »
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yep exactly.
egt/vvt delete via tunerpro (though not perfect. I had to raise bts threshold over 1000 because bts fueling kept on taking over from lamfa). No codes.
my mlhfm is untouched original copied from the amu file.
kfkhfm and fkks are NOT all 1's however.
they are also untouched copies from the amu file.
would all 1's be better? I can try that and see how it goes.
i'm going to try the fkkvs fixer right now also.
Thanks for that amk log. that is good info. I think my maf readings are might still be accurate though.
the amk looks like it's low up top because its very low boost up there. only 13psi. I'm getting 15-16psi up top. So more maf g.
Also I have very very good intake and exhaust.
Full 80mm intake tube all the way to turbo. 10" cone filter.
full 3" downpipe, exhaust, decatted.
2.5" charge piping from throttle body to turbocharger.
FMIC
I will log per your request also!
rl ;{EngineLoad rl}
rl_w ;{EngineLoad rl_w}
rlmax_w ;{EngineLoadCorrected}
rlmx_w ;{EngineLoadSpecified}
rlsol_w ;{EngineLoadRequested}
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tadope
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« Reply #22 on: December 14, 2021, 07:16:58 PM »
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ok lots of little tweaks and here is an updated log.
any thoughts?
I added the logging values you recommended.
I noticed that requested engine load is matching ldrxn. about 170
but then actual load is higher about 190 . I suppose it's not a critical error or problem.
I'm wondering if maybe it's actually just suppposed to be that way?
looks like the boost spike and afr spike is somewhat under control now.
tweaked imx down, then drl up, then tldiapn up, then fkkvs up.
still not sure how you adjust kfkhfm based on lambdacontrol though.
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aef
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« Reply #23 on: December 15, 2021, 01:51:40 AM »
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Okay not bad read this your rlmax and rlmx drift apart https://s4wiki.com/wiki/Tuning#Boost_.28rlsol.29_intervention_via_rlmaxHowever, there are many things which cause rlmax to not follow rlmx from LDRXN. you should overthing your desired lambda. its rich and will have a negative effect on turbo spool up. do you have a type-k temp sensor in the turbo or manifold? add the following vars to your logger to start tune timing: zwbas zwgru zwist zwopt zwout zwsol |
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« Last Edit: December 15, 2021, 02:26:21 AM by aef »
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tadope
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« Reply #24 on: December 15, 2021, 08:28:40 AM »
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I'd lean it put gladly. I read somewhere that 11.5-12 was best for wot ? How lean can I go?
I very much appreciate all this advice.
I'll log those ignition variables too.
I was simply going to set timing to the maximum before correction factors go too high(maybe -4)
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tadope
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« Reply #25 on: January 12, 2022, 10:47:16 PM »
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Here is my latest iteration.
I decided to try out 100oct and max it out.
so I'm running boost just under the 22 max.
I can still add more timing however.
What do you think?
I'm having an issue with boost up top. No matter how high I set LDRXN , I keep getting only 17-18lbs.
I dont get it. logs clearly show load specified as 225, but actual engine load is only 190 . what gives?
(p.s. the bin I have added has a couple edits to try and fix this, like higher kfldhbn for example. This has not been flashed and isn't in the log however)
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« Last Edit: January 12, 2022, 11:01:43 PM by tadope »
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aef
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« Reply #26 on: January 13, 2022, 12:03:11 AM »
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I checked your log
Lambda is not following your request and your fueling is maxed out
Your boost is building very slowly, is your turbo damaged?
I heard more than 95% duty will fry your n75 because the valve will burn inside.
A k04 is a small turbo and it is just not capable to keep boost up top
stock rods?
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tadope
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« Reply #27 on: January 13, 2022, 02:01:22 AM »
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Oh right i forgot to mention. I so have 630cc inj that i need to install. The stockers are maxxed.
And i do wonder about that turbo. Something is up with it. It never made the boost it should.
But i cant find anything when inspecting it.
The afr has the same lean spike i get at boost onset aleays. Never could figure out how to get rid of it.
Ill turn down the duty cycle.
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nyet
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« Reply #28 on: January 13, 2022, 09:20:08 AM »
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I'm having an issue with boost up top. No matter how high I set LDRXN , I keep getting only 17-18lbs.
I dont get it. logs clearly show load specified as 225, but actual engine load is only 190 . what gives?
Request is the important bit when changing LDRXN, not actual. Are you confusing the two? |
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tadope
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« Reply #29 on: January 13, 2022, 10:27:00 AM »
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Request is the important bit when changing LDRXN, not actual. Are you confusing the two?
Nah. Im just looking at the area above 5k. I have adjusted ldrxn up again and again, but requested doesnt change at all. It keeps tapering downward. Its as if i could tell ldrxn to request 40lbs and it would still end up with the same 18lb request. Kfmirl and kflhbn are both set much higher. So i dont know whats limiting it. Could it be kfmiop? S4wiki says not to touch this though? |
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