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Author Topic: disable/raise max pressure exceeded limit (P1555 P0234) for part throttle w/ MBC  (Read 25434 times)
Giannis
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« Reply #15 on: November 21, 2011, 03:30:03 AM »

in my damos i have y axis factor 40 offset 0 and x axis factor 10 offset 0 locations are for entire map 1F33F for y axis 1F32F and for x axis 1F337 try these are much closer to your file. I am posting and an original file so you can compare to find the addreses in yours.
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dragon187
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« Reply #16 on: May 18, 2015, 10:13:42 AM »

hello
i have the problem with 17963 Charge pressure: Maximum limit exceeded code.
i tried to deactivate this but i cant find the right map.

please help

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nyet
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« Reply #17 on: May 18, 2015, 11:51:48 AM »

i have the problem with 17963 Charge pressure: Maximum limit exceeded code.
i tried to deactivate this but i cant find the right map.

Why would you deactivate a safety feature telling you that you screwed up your tune?
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dragon187
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« Reply #18 on: May 18, 2015, 12:44:03 PM »

because i can not run more than 1.5bar boost midrange and 1.3 in high rpm
« Last Edit: May 19, 2015, 01:50:49 PM by dragon187 » Logged
dragon187
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« Reply #19 on: May 18, 2015, 12:45:49 PM »

here is ori file
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nyet
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« Reply #20 on: May 18, 2015, 12:53:24 PM »

1) Have your requested boost line up properly with your actual boost.
2) Don't use an MBC
3) If you have a wastegate tighter than stock, tweak the first line of KFDLULS (or KLDLUL) to match (or exceed) your wastegate pressure.

The stock values of KFDLULS (2000mBar!) should be more than sufficient, although KLDLUL (only ~500mBar) is on the edge and could use tweaking, especially if you are running tight waste gates. This applies even if running conventional N75 boost control!

that said, if you spend a lot of time WOT with a very negative lde you are doing it wrong.
« Last Edit: May 18, 2015, 01:22:57 PM by nyet » Logged

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dragon187
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« Reply #21 on: May 18, 2015, 12:53:41 PM »

here is tune
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dragon187
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« Reply #22 on: May 18, 2015, 12:56:08 PM »

forgott to attach file

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dragon187
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« Reply #23 on: May 18, 2015, 12:58:53 PM »

so if i now increase on this file  LDRXN from 210 to 230 the problem comes  back where the boost is cutting off to 0 Bar
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nyet
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« Reply #24 on: May 18, 2015, 01:02:29 PM »

Get a proper log. Not VCDS.

One more time:

If you spend a lot of time with a very negative lde you are doing it wrong.
« Last Edit: May 18, 2015, 01:06:18 PM by nyet » Logged

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dragon187
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« Reply #25 on: May 18, 2015, 01:08:40 PM »

ok i understand. but if i try to make more boost is same.

and i can not see where is KLDLUL in my file.

thanks
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nyet
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« Reply #26 on: May 18, 2015, 01:12:29 PM »

ok i understand. but if i try to make more boost is same.

FORGET ABOUT KLDLUL for a moment. Make sure your actual boost tracks requested first.

For the THIRD time:

If you spend a lot of time with a very negative lde you are doing it wrong.

If you get boost figured out WOT, THEN worry about KLDLUL (when req boost is 0) and wg cracking pressure.
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nyet
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« Reply #27 on: May 18, 2015, 01:20:49 PM »

Also another way to go about this without KFDLULS would be KFLDRX0 delta filling in overboost.  Reducing KFLDRX0 and raising your LDORXN would reduce the magnitude of the setback when you trigger overboost.  I believe setting delta filling to zeroes and raising max load during overboost to say 191 would effectively cut out the intervention completely.

I know this is a very old post, but I just wanted to comment: on some files, you'll set a code, and the car will stay in limp mode until the code is cleared, so fiddling with KFLDRX0 and/or LDORXN isn't actually a great fix Wink
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elRey
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I've wondered this for a while now..... In the area of spool up, if you lower requested to somewhat match actual turbo spool, will you leave any power on the table?

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nyet
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I've wondered this for a while now..... In the area of spool up, if you lower requested to somewhat match actual turbo spool, will you leave any power on the table?



Depends entirely on your wastegate setup, but in general, you want to set things up so you have 100% dc during spool. If your req boost is too close to actual the P and I contributions may not be big enough to result in 100% dc.

Now, if your waste gate is tight enough, that might not matter.
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ME7.1 tuning guide
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Please 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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