lawer
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« on: December 23, 2013, 04:59:37 PM »
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Hi to all
I am facing a very strange problem with my car and a file that I did. The requested boost at top RPM is dropping suddenly too low
I request 220% load and 100% torque at 220%
I don't understand why at low-mid range I have normal boost request at 2350-2400mbar and suddenly in 5000RPM it drops to 1700mbar causing hard TP cuts
I have also tested flat 215% LDRXN but I just got 2550mbar at low RPM boost request but at 5000 I had the same issue!
I will appreciate anyone in advance level who will help me or advice me
In the attachment you will find my current mod
Regards,
Lawer
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oldcarguy85
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« Reply #1 on: December 23, 2013, 05:20:04 PM »
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What turbo is on the car?
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nyet
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« Reply #2 on: December 23, 2013, 07:30:29 PM »
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Impossible to tell w/o logs.
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lawer
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« Reply #3 on: December 24, 2013, 08:02:44 AM »
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We talk about stock turbo and st2 tune (intake + exhaust)
this log is done with flat 220% LDRXN
see at high RPM what I am talking about
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littco
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« Reply #4 on: December 24, 2013, 09:06:48 AM »
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We talk about stock turbo and st2 tune (intake + exhaust)
this log is done with flat 220% LDRXN
see at high RPM what I am talking about
Any stock turbo requesting 220load at 5000rpm is going into negative deviation and limp mode... Never in the month of Sundays is it going to hold/meet 220 load.. |
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« Last Edit: December 24, 2013, 09:08:55 AM by littco »
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nyet
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« Reply #5 on: December 24, 2013, 11:35:51 AM »
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Please post raw .csvs, not xls files, which are useless for post processing
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lawer
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« Reply #6 on: December 25, 2013, 02:36:52 AM »
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as you can see my mod file it is not flat 220% but dropping 160%!
as I said also I did a test with flat 220% but the requested boost at top RPM is not 2550 but 1700mbar
This is my problem
at 5000RPM I have
spec load 191.7
spec corr load 208
req boost 1800mbar
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littco
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« Reply #7 on: December 25, 2013, 04:26:15 PM »
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as you can see my mod file it is not flat 220% but dropping 160%!
as I said also I did a test with flat 220% but the requested boost at top RPM is not 2550 but 1700mbar
This is my problem
at 5000RPM I have
spec load 191.7
spec corr load 208
req boost 1800mbar
Still don't know why your trying to run 191load or more on a turbo that'll never make it! |
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nyet
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« Reply #8 on: December 25, 2013, 05:47:52 PM »
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And I still dont see a csv
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ddillenger
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« Reply #9 on: December 25, 2013, 06:00:10 PM »
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DMVDUB said he's got this.
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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 experience!
Email/Google chat:
DDillenger84(at)gmail(dot)com
Email>PM
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lawer
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« Reply #10 on: December 30, 2013, 01:49:48 PM »
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here is the .csv that you asked for
You can see the problem starting from 4500RPM where my boost drops but requested load and corrected requested load is high as I have set it via software
whatever I do to load request, the boost request drops to 0.5-0.6bar from 4500-limiter
This is really odd to me
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nyet
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« Reply #11 on: December 30, 2013, 04:05:57 PM »
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Any stock turbo requesting 220load at 5000rpm is going into negative deviation and limp mode...
Never in the month of Sundays is it going to hold/meet 220 load..
This. You're going to limp because you can't ever reach that requested load/boost. Also, not sure what is up with your csv... is that an old version of VCDS? The headers are useless. They all say load and abs. pressure with no indication of what is desired etc. |
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« Last Edit: December 30, 2013, 04:07:31 PM by nyet »
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ddillenger
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« Reply #12 on: December 30, 2013, 04:37:12 PM »
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Interesting tag in that file.
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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 experience!
Email/Google chat:
DDillenger84(at)gmail(dot)com
Email>PM
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brs
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« Reply #13 on: August 13, 2018, 12:12:38 PM »
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Hi all
i know this topic very old but any found a solution ?After 5700rpm request boost drops speedly.
Log is here
Thanks in advance
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brs
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« Reply #14 on: August 14, 2018, 11:33:16 AM »
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any idea or a hint ?
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