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Author Topic: How to make sense of and set a good boost profile  (Read 10174 times)
phila_dot
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« Reply #30 on: September 23, 2014, 10:36:02 AM »

Easiest - most simple - you choose. Smiley
We are at see level, and there is no much altitude in Sweden at all.
Driving on e85 around the year, keeps the car in country.
I got a couple of DDs for driving outside of Sweden.


I would tune KFMIRL/LDRXN for desired boost profile and tune KFLDHBN so that ldrlts_w is just above rlmxko_w at sea level.
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« Reply #31 on: September 23, 2014, 12:32:44 PM »

I would tune KFMIRL/LDRXN for desired boost profile and tune KFLDHBN so that ldrlts_w is just above rlmxko_w at sea level.





What do you make of it?
It looks good to me

ldrlts_w directly relates to my HBN???
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« Reply #32 on: September 25, 2014, 02:26:40 PM »

Bump on the HBN map

This is  colant temp or IATs vs rpm axes.
Output should be absolut pressure.
Now, HBN is max pressure for altitude limitation.
I need to clear this up.

If we take 6000rpm at 100deg F or C??
Does the output value means that car should not boost more then 1.1 bar = 16 psi??
At what altitude in that case??
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nyet
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« Reply #33 on: September 25, 2014, 03:27:10 PM »

If we take 6000rpm at 100deg F or C??
Everything in motronic is always C

Quote
Does the output value means that car should not boost more then 1.1 bar = 16 psi??
At what altitude in that case??

Please, step back and do some reading on turbos :/

Specifically, pressure ratio Sad
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« Reply #34 on: September 25, 2014, 11:06:42 PM »

Everything in motronic is always C

Please, step back and do some reading on turbos :/

Specifically, pressure ratio Sad

At that point it says 2.09, what does it mean exactly?
Why cant you give me a straight answer, please. It was a straight forward question.
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ddillenger
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« Reply #35 on: September 25, 2014, 11:15:07 PM »

At that point it says 2.09, what does it mean exactly?
Why cant you give me a straight answer, please. It was a straight forward question.


He did. It's a ratio. If you know atmospheric pressure, you can plug it in to get maximum allowable boost.
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« Reply #36 on: September 25, 2014, 11:36:02 PM »

He did. It's a ratio. If you know atmospheric pressure, you can plug it in to get maximum allowable boost.

Thank you!!!
This is what i was after.
It explains everything.
I was on to it.
Atm pressure is 983mbar here
0.983 x 2.09 is about 2.1 bar absolut, which gives us 1.1 bar of boost or 16psi.
That should be just right??
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aef
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« Reply #37 on: February 12, 2019, 05:03:11 AM »

Very old thread...

I am trying to understand why my plsol is like it is. This thread does not contain useful information about 1.8t me7.5 i think.
Will try to log with vvt on/off over the whole rpm range. Maybe some 1.8t guy knows what to touch? my HBN is maxed, LDRXN is my limitation.

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nyet
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« Reply #38 on: February 12, 2019, 10:02:14 AM »

Very old thread...

I am trying to understand why my plsol is like it is. This thread does not contain useful information about 1.8t me7.5 i think.
Will try to log with vvt on/off over the whole rpm range. Maybe some 1.8t guy knows what to touch? my HBN is maxed, LDRXN is my limitation.



What do you think is wrong with it? You didnt post any logs or any rationale. Requested load is covered extensively in the s4 wiki tuning page.
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ME7.1 tuning guide (READ FIRST)
ECUx Plot
ME7Sum checksum checker/corrrector for ME7.x

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 experience.
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