NefMoto > Technical > Tuning > Open loop boost
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Author Topic: Open loop boost  (Read 17840 times)
adam-
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« Reply #15 on: February 25, 2015, 02:42:05 AM »
There's a nearly finished CB hacked file on here, I'm sure.  Pretty sure it's Dan's!
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carsey
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« Reply #16 on: February 25, 2015, 05:59:25 AM »
Can you not set boost up with a gauge/ boost logger on dyno and add a fixed duty cycle to the 1500mbar row on IMX and the ECU will only use that set duty cycle for pressures over 1500mbar and for the RPM sites?  Obvilously need to be setup under engines highest load.
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spacey3
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« Reply #17 on: February 25, 2015, 06:16:02 AM »
Quote from: carsey on February 25, 2015, 05:59:25 AM
Can you not set boost up with a gauge/ boost logger on dyno and add a fixed duty cycle to the 1500mbar row on IMX and the ECU will only use that set duty cycle for pressures over 1500mbar and for the RPM sites?  Obvilously need to be setup under engines highest load.

You can, but as DD and prj mention, temperature and altitude will affect what boost you get for a given duty cycle.
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aef
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« Reply #18 on: February 25, 2015, 07:07:05 AM »
another noob question:

This is how it worked in the 10+ years before the 5120hack?
No corrector for IAT and altitude?
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carsey
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« Reply #19 on: February 25, 2015, 07:31:15 AM »
Does anyone know how much boost is affected at different altitudes and atmospheric temperatures?

What did the early AGU me3.8 do or was this worked out differently?
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prj
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« Reply #20 on: February 25, 2015, 03:00:41 PM »
Quote from: aef on February 25, 2015, 07:07:05 AM
another noob question:

This is how it worked in the 10+ years before the 5120hack?
No corrector for IAT and altitude?

There is LDIATA and KFLDIOPU, but trying to control boost using PWM on a bleed valve in open loop is just asking for disaster.
Worst case, fit a MBC in parallel, and set DC to 100% over a certain requested pressure, and let the MBC handle it.
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eliotroyano
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« Reply #21 on: February 26, 2015, 05:28:59 AM »
Quote from: carsey on February 25, 2015, 07:31:15 AM
Does anyone know how much boost is affected at different altitudes and atmospheric temperatures?
What did the early AGU me3.8 do or was this worked out differently?

There are some maps that modifies boost (LOAD) base in temperature and/or altitude:
Intake Air Temp: KFLDSAK, KFLDTVAK
Altitude: KFLDSHK.
There are some others but I think these are the most important ones.
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prj
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« Reply #22 on: February 26, 2015, 10:36:44 AM »
Quote from: eliotroyano on February 26, 2015, 05:28:59 AM
There are some maps that modifies boost (LOAD) base in temperature and/or altitude:
Intake Air Temp: KFLDSAK, KFLDTVAK
Altitude: KFLDSHK.
There are some others but I think these are the most important ones.


There is no boost in M3.8.x. Pressure does not exist in that ECU.
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nyet
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« Reply #23 on: February 26, 2015, 11:05:56 AM »
Quote from: carsey on February 25, 2015, 07:31:15 AM
Does anyone know how much boost is affected at different altitudes and atmospheric temperatures?

PV = nRT

It is literally baked into the load->boost calculation path.

Please review the s4wiki again.
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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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