NefMoto > Technical > Tuning > Actual vs Desired Boost Stock 1.8t (stage 1)
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Author Topic: Actual vs Desired Boost Stock 1.8t (stage 1)  (Read 6326 times)
gin+
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« on: March 08, 2017, 10:00:07 AM »
Hey gents!  More newb questions!

I'm trying to determine if my stock 1.8t has mechanical issues or if what I'm seeing is normal behavior for a k03s.

I recently increased KFLDHBN so actual boost appears to be following LDRXN but desired boost is still considerably higher than actual.  I'm not sure if I should be messing with KFLDIMX at this point or really how to configure it if I wanted to.

Appreciate any input!

 
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gin+
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« Reply #1 on: March 08, 2017, 10:06:10 AM »
Wastegate duty cycle and log might be helpful to a trained eye!
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nyet
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« Reply #2 on: March 08, 2017, 11:35:25 AM »
Yes, you need more IMX.

Log all of the PID variables.
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gin+
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« Reply #3 on: March 08, 2017, 05:34:39 PM »
I increased LDIMX at 850 and 1000mbar and it definitely closed up some of the gap.  I used a TT225 table as sort of a reference.  I guess my question now is why desired is much higher than what I have specified in LDRXN.  That specifically happened after increasing LDHBN but I don't necessarily understand if "LDRXN - maximum specified load".  Perhaps my math is off?
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nyet
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« Reply #4 on: March 08, 2017, 06:33:10 PM »
Quote from: gin+ on March 08, 2017, 05:34:39 PM
I guess my question now is why desired is much higher than what I have specified in LDRXN.

Desired what? Boost or load?

Quote
That specifically happened after increasing LDHBN but I don't necessarily understand if "LDRXN - maximum specified load".  Perhaps my math is off?

What math did you use?

Please read the load->boost conversion section of the tuning page.
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ME7.1 tuning guide
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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
gin+
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« Reply #5 on: March 09, 2017, 03:30:44 AM »
I'm sorry, desired boost.

I used the formula from the s4wiki. My target boost at 3k is 15psi so I I specified ldrnx with a load value of 173.00 expecting (173 x 10) + 300mbar = 2030mbar but I'm seeing much higher numbers in my logs.
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fknbrkn
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« Reply #6 on: March 09, 2017, 04:47:53 AM »
15psi = ~150% load at mid-range
you should not touch kfldimx/drl stock values when using stock turbo / wg. if you running higher than 1100 mbar (last axis value) then rescale axis to add new value for higher boost with a new data
« Last Edit: March 09, 2017, 04:54:04 AM by fukenbroken » Logged
gin+
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« Reply #7 on: March 09, 2017, 09:02:17 AM »
@nyet;  Firstly, I want to thank you for your contributions in unlocking these mysteries.

Quote from: gin+ on March 09, 2017, 03:30:44 AM
I'm sorry, desired boost.

I used the formula from the s4wiki. My target boost at 3k is 15psi so I I specified ldrnx with a load value of 173.00 expecting (173 x 10) + 300mbar = 2030mbar but I'm seeing much higher numbers in my logs.

Maybe I'm not taking into account of this being a rough approximation considering all the factors involved in rlsol to plsol calculation.

Quote from: fukenbroken on March 09, 2017, 04:47:53 AM
15psi = ~150% load at mid-range
you should not touch kfldimx/drl stock values when using stock turbo / wg. if you running higher than 1100 mbar (last axis value) then rescale axis to add new value for higher boost with a new data

Thank you for your insight however I am a bit confused.  Which table are you referencing that I rescale its axis?
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4ringpieces
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« Reply #8 on: March 09, 2017, 11:20:40 AM »
Kfldimx

Some people rescale, some people don't
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gin+
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« Reply #9 on: March 10, 2017, 11:29:21 AM »
@Fordy; Thank you!

After a ton of reading and head scratching I think I have a preliminary grasp on PID that I lacked literally two days ago.  This stuff gets in deep in a hurry...
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