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Old 07-27-2018, 01:54 PM   #1
t8fanning
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Default Boost blending using flex

I am using MS3Pro and have two blend curves based on my flex. One is the basic blend curve, and the second is a boost blend curve that goes between two target tables. At 60% flex, my boost blend curve is at 100% table 2, so my boost setting should be commanded only by table 2. However, when I input a target of 305 kpa to table 2, my boost duty table is looking at cells just above 275 kpa. Only when I input a target of something like 33 kpa do I get a boost duty for 305 kpa. My main flex blend curve does not dictate 100% tables 2 at 60% flex. Does this table affect the boost control, or is there another multiplier or blend function I could be missing?
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Old 07-29-2018, 01:08 AM   #2
t8fanning
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If anyone cares, I've figured out what is causing it to happen, but I don't understand why the software works that way. Blend curve 8 controls blending between the two tables for all values based on ethanol content. Blend curve 6 controls blending between the two tables for boost only. Blend curve 8 overrides blend curve 6 and scales back boost. It doesn't make sense to me why this is programmed that way, but it is. I made a post in msextra to try and get some more insight:

http://www.msextra.com/forums/viewto...?f=131&t=69535
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Old 07-30-2018, 11:17 AM   #3
linuxman51
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interesting. I wouldn't have expected that behavior either, it'll be interesting to see what they say about it.
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Old 07-30-2018, 11:21 AM   #4
t8fanning
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A guy on msextra showed me my real problem. I was trying to control boost two ways. I was using dual fuel which uses the same flex blend curve as AFR, spark and VE, and my separate boost blend curve. Once I turned off the boost table switch setting in the dual fuel tab it stopped scaling.

So megasquirt works as expected, the problem was between keyboard and chair as usual.
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Old 07-30-2018, 11:22 AM   #5
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Interesting stuff. Can't wait to get back to playing with this.
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Old 08-09-2018, 10:07 AM   #6
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Quote:
Originally Posted by t8fanning View Post
A guy on msextra showed me my real problem. I was trying to control boost two ways. I was using dual fuel which uses the same flex blend curve as AFR, spark and VE, and my separate boost blend curve. Once I turned off the boost table switch setting in the dual fuel tab it stopped scaling.

So megasquirt works as expected, the problem was between keyboard and chair as usual.
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