I bought my evo x a couple of months ago. Well I'm finally starting to get ready to do some mods and today I found something weird. So my car has an aftermarket boost controller and the lines run as follows in reference to the boost controller numbers picture.
1 to inlet side of turbo
2 to wastegate
3 to outlet of turbo
I was wondering if this is routed correctly to anyone else who may have this controller. And if so if i want to e-tune in the future can I use this controller or do I need to buy the grimmspeed one?
I'm also curious about why the old boost controller is still in the car and has all of the lines teed to nothing and ran together and what no. You can see the blue boost controller isn't even mounted its just zip tied to the hoses coming off the original boost controller.
Does anyone know why this is? Just curious if there is a strategy behind this.

Tee they had running off the old boost controller that isnt in use.

Coming from port 2 on the blue boost controller

Coming from port 1 of the blue wastegate

Coming from port 3 of the wastegate.

RS Motors boost controller

Tee that is attached to old boost controller.

A bunch on fittings and tees coming off the old boost controller that join together and go to atmosphere.

 

You can def use that ebcs for the tune. my guess is that someone didnt use any tuning software, so they had no way of setting up the duty cycle values to make it regulate boost effectively. check to see where the wastegate is getting its vac source from. if its just seeing direct boost, its going operate of the gate spring pressure. Stock, the evo x has two solenoids, and active and passive. the ebcs they make as plug ins, eliminate the passive solenoid.

normal hook up is to have a source from the compressor going to one side of the ebcs, and another going to the wastegate (assuming its an internal gate), the third port can vent to atmosphere. once thats done, and its plugged into the harness, ecuflash has boost tables that allow you to modify the duty cycle of the ebcs. 0% duty means the ebcs is always open, which will result in the gate opening when it sees boost high enough to overcome the spring pressure in the gate. 100% would be fully closed, resulting in typically double of what the spring pressure in the gate is.

So lets say you have a 12lb spring in the gate. at 0% duty, its going to open at 12psi. at 100% duty, it would be like 24psi give or take. the idea is to use the duty cycle values to make the turbo spool asap, then hold the target boost pressure by cycling the wastegate.

even though they make ebcs that plug into the oem harness, you need software to tell it what to do. hope that helps answer your question.

theres obviously a lot more that goes into the boost control logic when setting desired boost with the evo x, but basically a ebcs needs to see actual boost levels from the compressor, and then have a hose going to the wastegate. its just a valve really that can open and close at specific rate in order to modify how much boost is getting the wastegate, therefore allowing boost levels that can be higher than whatever the spring in the gate is rated to.

btw, the third port, is normally for external wastegates. they have a vac port on the top and bottom of the diaphragm,so unless you have a external gate, the third port can be left open. some ppl run it to the intake, after the maf,and before the compressor inlet.