I have a boost problem were it goes only up to 19 lbs no matter wat mbc it tapers really fast, my current mbc is FORGE UNOS , i have it running just like the instructions , one going to the inlet/outlet tube and the other to the westgate actuator like most are doing it, i used new vacummm hoses to prevent any hidden stock solenoids, wen i turned the mbc it was like this

1- turn - 13psi
2- turns- 18psi
3- turns- 19psi
4-10 turns 19 psis


Like it can go lower than that but no higher, i had a different mbc before(turbo xs standard) and it was the same exact thing.

Please help me with any tips or pictures that you may have or if you ever ran into this error tell me how you fixed it, thanks.

 

i had that problem with the perrin mbc, try switching the way you have the hoses connected

 

well i did it exactly as it said in the instruction booklet but its never worth a try, ill go do it right now and come back with the results.

 

tried it, but now its 1st gear - 15psi no taper, 2ne gear 15 psi no taper, 3rd 12 psis no taper, why would it go down in third, its late so i will try it tommorow again,

 

when u say "turn" is that a full rotation or clicks?

 

full rotation, which is about 5 clicks.

 

wow idk i have the same one i think and mine works fine!?!?!?!

 

can you take a picture of how you have it set up please.

 

Dude just tighten your wastegate 3 full turns prob solved. take off the mbc

 

check your spring. i have a hallman MBC and it came with 2 springs. i couldn't get one spring to go about 20psi the spring just wasn't stiff enough to hold it closed. so i put a new stiffer spring in it and it works like a charm.

 

Disconnect the vac house from the wastegate completly and then go see what you boost. If you do not boost more than 19psi this way then you have a problem with something else, ie bad wastegate, wastegate to loose, boost leak, turbo problem or your gauge is wrong.

 

do you still have the forge wga installed? if so take that off and see how much you boost