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Author Topic: Wierd lean condition  (Read 59249 times)
matchew
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« Reply #75 on: July 30, 2012, 01:04:34 PM »

Excellent Smiley
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Bische
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« Reply #76 on: July 31, 2012, 02:18:44 AM »

Grats! Glad to hear you made the jump to do your own stuff. Thats the tricky thing about M7 imo... once you are smart enough to get M7 to do what you want it to do, you pretty much have the knowledge to do your own file...

I entirely agree. The grass is a little greener on the other side Wink

Here is a 3rd gear pull: http://youtu.be/nmIP7GP_GDk

Log from that pull: https://docs.google.com/spreadsheet/ccc?key=0AlddzLucZT07dGcyaWQxYUlhWHcyTlV2dVlxUWl2akE

I did flick the gas mid-pull, as my boost did overshoot some.
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nyet
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« Reply #77 on: July 31, 2012, 09:05:37 AM »

pull some I limit and get a proper log.

post the original csv

run it through ecuxplot.
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ME7.1 tuning guide
ECUx Plot
ME7Sum checksum
Trim heatmap tool

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
matchew
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« Reply #78 on: July 31, 2012, 09:46:18 AM »

Tune the boost request to be closer to reality in the lower revs, this will give you a better place to start from when trying to tune the boost control PID.
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nyet
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« Reply #79 on: July 31, 2012, 09:53:39 AM »

not sure that is a good idea (IMO), you'll affect spool rate if it is too low.

At lower revs, you want two things

1) keep the req boost low enough to prevent positive deviation.
2) keep the req boost high enough to prevent the PID from cutting WGDC from 100% during spool on WOT

If you can't do both, you may have to tweak a few other maps

http://nefariousmotorsports.com/forum/index.php?topic=871.0title=
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ME7.1 tuning guide
ECUx Plot
ME7Sum checksum
Trim heatmap tool

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
matchew
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« Reply #80 on: July 31, 2012, 10:01:22 AM »

Depends if he wants to tune all the factors of boost control correctly, which is what should be done when changing turbos.

I personally would totally tune all factors of the PID control. Not just rely of the I-term limiter. You can see that the PID is out of whack by how far away "stable" boost is from request, and how "stable" it is, also by how far it over shoots (this has more to do with than just the I-term limiter)

Horses for courses, it was just a suggestion.
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nyet
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« Reply #81 on: July 31, 2012, 10:34:31 AM »

The most difficult region to calibrate the PID for is where actual is about to cross req until the higher rpms when req is stable.

Not sure what you meant by "low revs". If you meant that region, I agree. If you meant during spool, then i disagree Wink
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ME7.1 tuning guide
ECUx Plot
ME7Sum checksum
Trim heatmap tool

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
Bische
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« Reply #82 on: August 01, 2012, 05:40:56 AM »

Thanks for the quick tips, I did pull out about 10% on the I limit near the point where actual boost meets requested. Also lowered requested load under 3500rpms.

I feel I first need to learn how a PID controller works and trace the diagrams in FR back and forth a few times Smiley
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