Who uses the Boost by gear feature and how...
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Reviving this thread...
I tried to do as you suggested, Jason. Did I understand you right?
![](https://www.miataturbo.net/attachments/megasquirt-18/130981-who-uses-boost-gear-feature-how-boost_targets_130115.jpg?dateline=1421135329)
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...![Dunno](https://www.miataturbo.net/images/smilies/dunno.gif)
So all the targets below ~166kPa seem useless to me...?
I tried to do as you suggested, Jason. Did I understand you right?
![](https://www.miataturbo.net/attachments/megasquirt-18/130981-who-uses-boost-gear-feature-how-boost_targets_130115.jpg?dateline=1421135329)
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...
![Dunno](https://www.miataturbo.net/images/smilies/dunno.gif)
So all the targets below ~166kPa seem useless to me...?
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