Originally Posted by mid_life_crisis (Post 1056909)

There was a good reason for wanting to know the motor speed but I can't remember it right now. Sucks getting old. It'll come back to me eventually though.

Originally Posted by Calum (Post 1056921)

Tuning gain is great, but a system like this would require the ability to correct offset as well. Otherwise the system could settle out at the wrong boost pressure and as long as the error signal (feedback compared to setpoint) is steady then the system wouldn't correct for it.

I've calibrated and rebuilt more then my fair share of pneumatic controllers that can do this, but I have no idea how to do it in the digital world. Basically for this to work well a controller that can do both proportional and integral adjustment is what to look for. A full PID wouldn't be required though, I don't think.

Or am I an idiot and that's already in the code above?

Also, I really think we need to get past the idea of boosting to the back of a partially closed throttle. That's inefficient and with a setup like this shouldn't be required. If BRZ edit could be used to remap the throttle plate vs. pedal maps, then you could just set WOT to something lower in the pedals travel range then 100% and then use the rest of the pedal's travel to increase boost pressure to a max.

Originally Posted by Calum (Post 1056921)

Also, I really think we need to get past the idea of boosting to the back of a partially closed throttle. That's inefficient and with a setup like this shouldn't be required. If BRZ edit could be used to remap the throttle plate vs. pedal maps, then you could just set WOT to something lower in the pedals travel range then 100% and then use the rest of the pedal's travel to increase boost pressure to a max.

Originally Posted by neutron256 (Post 1057009)

Ahhaha programming drives me nuts. I've never had a knack for it. I'll stick with the hardware/electronics side of things. :)

Originally Posted by mid_life_crisis (Post 1057037)

I'm still of the notion that I don't want to have to reprogram the car's ecu. With a 3-d table we can set the boost at low rpms and partial throttle positions to levels that won't trip a code.

Originally Posted by mid_life_crisis (Post 1057037)

I'm still of the notion that I don't want to have to reprogram the car's ecu. With a 3-d table we can set the boost at low rpms and partial throttle positions to levels that won't trip a code.

Originally Posted by DAEMANO (Post 1057067)

Unichip?

Originally Posted by mid_life_crisis (Post 1057090)

The idea here is to have a kit that requires no additional purchases that we can just hook up and have it work.

Originally Posted by jamesm (Post 1057039)

Please do, we need that even more :)

Originally Posted by DAEMANO (Post 1057067)

Unichip?

Originally Posted by neutron256 (Post 1057110)

That's easy. I expect I'll have the hardware prototype ready to test in a couple weeks depending on my free time and motivation.



I'm currently running Unichip and I think this is a great idea. It supports this type of mapping, it's already getting the most of the data needed, and could probably directly output a control signal to the motor controller.

If I recall correctly its $200 for the tunner software/hardware. Not bad if I knew for sure I could get it to work.

Originally Posted by jamesm (Post 1057192)

the problem is that it is proprietary. it would be great if it could be controlled by as many engine management systems as possible, but you wouldn't want to require it.