My boost holds at 20 - 21 psi every time to redline. I have 0 error correction, boost target to 159.4, and max boost set to 319. Never had an over boost issue yet knock on wood lol. I am going to try to increase the boost to 23psi by removing the restrictor pill, lowering the wastegate duty from 100 to about 85 and playing with the boost target numbers a bit. Just a word of advice though, when playing with boost control settings put some race gas in the car, and tune the entire map to the last load column, so that way if you somehow over boost you will have that safety margin at the end.

 

Boost limit is a load value at which it decrements the delay timer. The timer is reset if load value goes below the boost limit. So the boost cut will occur if the load is higher than the boost limit for 1 second as the maps are as standard.

Zero error correction gives open loop boost control.

 

So zero correction pretty much works like a manual boost controller. Set it and forget it like that infomercial

 

I think that its still possible to tailor the boost curve shape even if the error correction table is zeroed. There's just no feedback that attempts to make the engine follow the boost desired load table.

 

I was running with zero correction for a while, but am now trying to tailor the correction chart to work with my new set-up.

 

I would say that a ball spring MBC is still a closed loop device with proportional but not integral correction. A simple restrictor would be more open loop (ie without any feedback). The zero correction is like a simple restrictor, or one that varies by RPM which can still be useful.

To confuse things, even just the wastegate actuator is not entirely open loop if you think about it hence why I say "more open loop".

 

So if I wanted to control boost better by removing/modifying the restrictor pill, how would I find it. I understand that it's by the solenoid valve, but I've looked under the hood and located everything but the darn solenoid. Is it under the air intake assembly? How hard is it to get to the solenoid and restrictor?

 

You can fill it with solder and drill out a smaller hole.

 

the solonoid is under the air filter and the restriction is a tiny brass peice in the vacuum line about 3 inches in.you can feel it if you pinch the right spot with your fingers

 

Wouldn't you want less restriction in the line so the solenoid can better vent off pressure from the wastegate actuator?


How do you get it out? Do you have to hook it with something, or push it out from the other end?

 

I used a pair of long nose pliers and slowly squeezed it out.

 

Hopefully I'll have a complete how-to on boost control with the stock boost solenoid and ECUFlash done by the end of the week (or month, ). I need to get some race gas and test race gas boost (24+lbs) and take some more logs and get the trubo correction working flawlessly. Anyways, I'll have a how-to soon.

 

You squeeze it out like toothpaste.

I think actually it is the WGA 2nd pill that comes out.

It is much simpler to go to a FORGE UNOS, but I understand what we're trying to accomplish here.