Yes ive used the turbotech boost controller more than once on many turbo builds so I know all about the boost controller you are using. Ive seen that article when it came out 7 or 8 years ago.
Its a good boost controller but like I said if you ecu can control boost you have an electronic boost controller right there for the price of a solenoid, hoses, and a few wires. thats still within your budget and has better control.
Then use the ecu to adjust the duty cycle of the solenoid at rpm intervals.
Even if you dont use closed loop you can use open loop electronic boost control.
You see the spike you get using an the MBC which is normal. This can be quite annoying once you start running higher boost. If you want 16psi at 6000rpm expect it to spike to 20psi.
You can control the spike, taper and boost level so you are getting the features of a $600 EBC for under $100.
Im still a fan of that Turbotech ball and spring boost controller since it it so cheap and ups the boost on a stock turbo car with ease.
All I can say is the Megasquirt ecu and a 3-port boost solenoid will piss all over any control of a MBC.
But requires more time and ecu tuning for initial setup but thats easy.
I run a 3-port solenoid to replace the 2-port solenoid. Control is awesome and using the stock EVO6 ecu retuned to what ever boost level or charactistics I want. If i want boost to come on at 5000rpm you can tune it to do that.
But hey whatever floats your boat if you think its better or suits your needs, or easier to setup then what can i say.
You have excellent features of the ecu at our doorstep. Up to you to use them.