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Old 07-23-2017, 12:57 PM   #702
allan5oh

Name: allan5oh
Title: Too Much Time
Status: Not Here
Join Date: Oct 2012
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Posts: 1,106
Now that I'm looking more into the programming side I understand what you were saying. Detroits don't truly run speed density, there's no temperature compensation for the intake air. So if you wanted to target a specific AFR you will be always richer when it's hotter and leaner when it's cooler. Not a huge deal on a diesel, but when you're trying to max out BSFC all across the range it doesn't work so well. Also I have to find a way to run absolute MAP for VNT control instead of relative. I think tricking the BARO sensor (not map sensor) to be 0 might work. There's no VE map either like many speed density systems so any change in engine breathing efficiency and you have to write an entire new program.
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