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Author Topic: Overboost 200mbar/2,9psi higher than max  (Read 2298 times)
nyet
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« Reply #60 on: October 12, 2017, 09:02:06 AM »

Why is your LDRXN a lumpy mess?
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TijnCU
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« Reply #61 on: October 12, 2017, 11:12:57 AM »

Why is your LDRXN a lumpy mess?
because kfurl is shit on wideband me7 1.8t's. So unless you go and change that, you need to jump through hoops with ldrxn to get any sort of flat boost request.
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SB_GLI
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« Reply #62 on: October 12, 2017, 11:19:55 AM »

because kfurl is shit on wideband me7 1.8t's. So unless you go and change that, you need to jump through hoops with ldrxn to get any sort of flat boost request.

Which is not a big deal, IMO.
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TijnCU
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« Reply #63 on: October 12, 2017, 11:22:25 AM »

sure isnt  Grin But it explains why this looks so craptacular
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nbdiy
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« Reply #64 on: October 13, 2017, 12:08:44 AM »

because kfurl is shit on wideband me7 1.8t's. So unless you go and change that, you need to jump through hoops with ldrxn to get any sort of flat boost request.

Exactly. On some of some them its additional KFPRK.
If you flat them out you need to make sure your requested boost will not cause rl to be higher then requested load
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Gaghunfv2
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« Reply #65 on: October 13, 2017, 03:38:57 AM »

UPDATE

So I've tried the Quick & Dirty solution, it hasn't changed much.
=> I've removed the ugly hop in LDRXN before
Attached file: "Log_Q&D.png"


But it gave me the idea to use "Suggest optimal X-Axis" of the ME7 Tuning Wizzard.
=> So I changed the X-Axis of KFMIOP
=> I used the KFZWOP(2) Calculator to recalculate KFZWOP(2)
Attached file: "Log_Q&D_2.png"
=> I know, my LDRXN still needs fine tune
=> But my requested boost is now over 16psi over 3000rpm, whooh!!  Grin


Question
Why is my "BoostPressureActual" jumping like that?
Maybe a faulty N75?
« Last Edit: October 17, 2017, 11:42:17 AM by Gaghunfv2 » Logged

adam-
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« Reply #66 on: October 13, 2017, 04:10:48 AM »

Use the BAM IRL/IOP.  I found the Wizard gave me a brutally rough idle.
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SB_GLI
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« Reply #67 on: October 13, 2017, 04:15:38 AM »

So I've tried the Quick & Dirty solution, it hasn't changed much.

It has, you just negated your changes by smoothing ldrxn again.

Quote from: Gaghunfv2
=> I've removed the ugly hop in LDRXN before

You shouldn't have.

Quote from: Gaghunfv2
But it gave me the idea to use "Suggest optimal X-Axis" of the ME7 Tuning Wizzard.
=> So I changed the X-Axis of KFMIOP
=> I used the KFZWOP(2) Calculator to recalculate KFZWOP(2)
Attached file: "Log_Q&D_2.png"

You shouldn't have

Quote from: Gaghunfv2
=> I know, my LDRXN still needs fine tune

it does

Quote from: Gaghunfv2
=> But my requested boost is now over 16psi over 3000rpm, whooh!!  Grin

as a result of IRL/IOP changes

Quote from: Gaghunfv2
Why is my "BoostPressureActual" jumping like that?
Maybe a faulty N75?

because you now need to bump up DIMX slightly to accommodate the higher boost request.  Your n75 is fine.

I feel like I've said this about 10 times so far, but I will one more time.   Tune your boost request to where you want it, and then LDRPID to account for it if needed.  Also, ditch all your KFMIOP changes, just the last row like I mentioned.  I bet it drive like butt at part throttle as a result of the axis changes you made.
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Gaghunfv2
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« Reply #68 on: October 13, 2017, 05:40:28 AM »

2 Logs attached.

First with KFLDIMX to 82, second with KFLDIMX to 77 (I think 82 was a little bit too much).
I just removed the dip in KFLDIMX.
LDRXN is more fine-tuned now.

Could it be possible that I have to touch Q2 now?
« Last Edit: October 17, 2017, 11:42:26 AM by Gaghunfv2 » Logged

SB_GLI
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« Reply #69 on: October 13, 2017, 07:14:59 AM »

It sounds like you are trying to just set a single value in the entire last column of DIMX.  Look at the values in the stock DIMX in the column you are modifying.  Are they a single, flat value all the way down that column?

Try modifying all values by a percentage rather than setting them all to one constant value and expecting that to work.  I'm pulling a number out of my arse here, but try adding 7% to the entire last column and see how that works for you, keeping a max of 95.
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4ringpieces
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« Reply #70 on: October 13, 2017, 08:31:49 AM »

Remember DRL is part of IMX both go together. Log the n75 duty properly there's a few variables
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Gaghunfv2
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« Reply #71 on: October 13, 2017, 10:15:31 AM »

I did a little bit trial-and-error.

1.
=>KFLDIMX = 7% up in the middle
=>KFLDRL Stock

2.
=>KFLDIMX = 7% up in the middle
=>LFLDRL = 100 in last column

3.
=>KFLDIMX = 7% up in the middle
=>KFLDRL = 80 in last column

I know, my PID is still wrong.
Honestly I don't even know yet how to edit KFLDRL properly, it was just trial and error for learning purposes.
But hey, my LDRXN is nearly perfect now. Cheesy Cheesy
« Last Edit: October 17, 2017, 11:42:34 AM by Gaghunfv2 » Logged

4ringpieces
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« Reply #72 on: October 13, 2017, 11:05:32 AM »

respectfully, put it back to stock, learn a bit more and go again.
Currently your turbo is very unhappy, you risk killing it or at least hurting its life.
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Gaghunfv2
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« Reply #73 on: October 13, 2017, 12:29:58 PM »

I hoped I don't get an answer like this just before this tune is finished. Sad
« Last Edit: October 13, 2017, 01:45:06 PM by Gaghunfv2 » Logged

4ringpieces
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« Reply #74 on: October 13, 2017, 02:35:03 PM »

Start a fresh tune

Literally change
Lamfa to your desires
Use the bam kfmirl/kfmiop it's a good starting point.
Raise your ldrxn get a nice request.
Raise your HBN to around 2.8 max, going too high here makes part throttle go a bit crazy spooling up 

You need to log pre and post linearisation of n75 duty cycle can't remember variable names off top of head.

Pre is DRL
Post is IMX

Check your log and find where DRL is sending you to in IMX.
IMX is the final output N75 duty.

Make changes in IMX where needed.
If your overshooting/undershooting pull/add some duty work in additives/subtracts of 1 or or 2 depending how far away actual is to requested.

Allow some overshoot at peak boost worry about this later, tune the settled boost for now.

You've done something in your file to induce craziness that's all.

Also aim for 0 CF and tad richer than normal fuelling for now. 

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