Who uses the Boost by gear feature and how... - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-17-2014, 12:52 AM   #21
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That's still pretty bad.

I would simply make the target go in a straight line from 120 kPa at 30% throttle, to 210 kPa at 80% throttle. And a straight line from 20 kPa at 0 throttle to 120 kPa at 30% throttle.
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Old 01-13-2015, 03:48 AM   #22
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Reviving this thread...

I tried to do as you suggested, Jason. Did I understand you right?

What I don't understand with this table now - how is the start of the control function handled...

As I understand the MS system of boost control:

I set a lower limit delta (how much below target the PID control will be started and the solenoid activated - up to this point the solenoid is kept closed)

Now - my Wastegate spring is 10Psi / 70 kPa (with standard ambient pressure of ~96kPa we are at 166kPa wastegate...
If I set the boost control target below at lets say 120kPa - we are well below Wastegate pressure - the control algorithm will try to regulate the pressure - but can't regulate the pressure lower than the Wastegate pressure...

So all the targets below ~166kPa seem useless to me...?
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Old 01-14-2015, 04:36 PM   #23
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I would change the "80" in the first column to 90.

Yes settings below 166 might be somewhat useless.
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