This is an old mod from this guy Stuart Hagen or "Stu Hagen" on supra forums.THIS MOD INCREASES BOOST ON THE FIRST TURBO
more pics and info in the link
last section from this linkhttp://www.max-boost.co.uk/max-boost/supra/boosting_the_beast.htm
Do this mod at your own risk.
There is also a chance of taking a hose off and not being able to complete the mod or put it back on due to lack of working space which you will see.
check your boost levels and AFR and adjust according to what you want.
These are most of the tools I used
going to need a MBC
I also had thinner pliers and a bolt I stuffed into some tubing and zip tied to plug a line.
tubing length depends on where you want the lines to run. I had about 4 feet of I think 5/16 vacuum line from piston ring.
screw driver was for undoing clips.
straight connector is optional.
This is what we want to complete
need to make room to get to the pressure line that leads to ebv actuator.
minimal amount of liquid will spill out since it's at the top of the engine.
screw driver was used here to open the grey clips
this is the hardest part.
do not start unless you are ready to give up and leave the hose disconnected or remove even more stuff out of the way to create more room to work with.
I pulled the hose off both the hard line and the actuator that is a little further down and put a new hose on.
you might want to just disconnect the line in the pic and stick the straight connector and new line into the hose.
I used some tubing with a bolt stuffed into it to cap the line the hose was pulled off of.
this is how I hooked up my T connector
this is where I have the MBC
and the complete install. Maybe some more zip ties when I decide where I really want to put it in the engine bay.
I finally got my 2nd MBC it's a ball and spring type.
replaced the MBC so this one now controls boost when only one turbo is working.
also shortened the hose on the bottom of the MBC so it's straight instead of curling around.THIS PART INCREASES BOOST WHEN BOTH TURBOS ARE WORKING
Now I'm using the bleeder type turboXS MBC in the front of the engine bay to control boost when both turbos are working.
First thing is to unbolt the stock airbox.
This is a good reference pic so I'm using it.
The pic shows a hose labelled the one you plug or clamp. it doesn't show but the top of the hose is connected to the turbo.
You want to take off this hose.
I reused the stock hose clamps from this hose on the new hoses. Definitely not enough space to get in and zip tie this one.
Connect a hose from the turbo to the bottom/in of your MBC.
This is the hardest part because it's also a tight space to undo the hose clamp and get the hose off and put on an extended hose to your MBC.
I had to take off my valve cover for an extra half in of space at the front corner of the engine to get at the top of this hose.
You can see in the pic, bottom of the hose is connected to the VSV.
You want to connect a second hose from the side/out port of the MBC to the top of the VSV.
Basically you just install the MBC into this hose labelled the one you clamp or plug.
next you want to take off the hose that is marked with a * at the bottom of the pic.
Cap off both ports the hose was connected to.
You can see the cheap caps I used made of some hose with a bolt inside tightened with a zip tie.
Now just adjust to your desired boost! Mine is set to 14 psi for now and will go up later.
someway of knowing how much boost you are running is strongly recomended.