Got the turbo XS high performance MBC and a Autometer boost guage and holder and set the boost at 19 PSi and it holds till red.. and boy i tell you, 19 PSi at 3000 rpm till red transfoms the Evo!!!

Very nice performance boost for $200.

 

Welcome to the consistant boost club!

 

Cong.... very nice!

I'm running my MBC at 1.4 bar =20.3 boost.. droping off too 1.35 = 19.5 at red line.

 

hi i had a turboxs mbc installed and could not get boost to stay at 19 psi it would drop down to 16 after 5500. and if i set at 20 it would spike to 22 then still drop to 16.5 any ideas ?

 

how hard to install? which is the best one?

 

To install a MBC it takes about 30-35 mins. Just get you a 10 mm socket and a extension.

Do search you can find how to install one.

Well worth the money.

 

You have to clarify how you installed it.. But if you installed your MBC without totally diabling the stock solenoid (removing the hoses from the wastegate solenoid and the snail) the ECU may still be controlling the boost..

Spiking to 22 is typical of the MBC being connected to the two locations where the stock SBC was connected.. I occasionally get spiking, but its never over 21.5 which is actually not causing problems with my state of tune..

Ok.. another possibility is that you have the boost source T'd off the blowoff valve.. Its possible that its not providing adequate signal to the BOV so it begins to leak (It doesnt put pressure against the diverter valve actuator so its forced open under pressure)

Hope this helps..

 

Well when I used the boost source from the turbo to the boost controller I cant maintain 19 PSi. But after i capped the turbo boost source and put a T on the vac line from the BOV and used that as a boost source to the MBC, it maintained 19 PSi nicely. It does say on the instruction that if you are boosting high PSI, you must use a pressure source after the throttle body which is from the manifold. 19 Psi at 3000 RPM is nice..

Install took 1 hr for me, I took the airbox out, the upper intercooler pipe and hose, and battery, the radiator fan to access the wastegate.

next would be the downpipe and emanage.

 

Hi. plz help me guys! I just installed my turbo xs high performance boost controller but i dont think its installed correctly because no matter what i do the boost always just keeps on going.

here is what i did.

I disconnected the 2 hoses comming out of the factory boost controller solenoid and i capped off the 2 black nipples with electrical tape and seald it off. I then cut the hose going from the blow off valve to the intake manifold and put a T in it and connected a hose to that T. The other end of that hose i put in the blue {bottom} nipple of the Turbo XS high performance boost controller. I then disconnected the hose going from the turbo and i capped that nipple off with electrical tape and sealed it. I then capped off the hose that used to be plugged into the factory boost controller soledoid to the intake and i sealed that off. I then plugged a hose into the wastegate actuator and plugged that into the bronz nipple on the turbo xs boost controller. the bronz one has an arrow on it.

I did the pre setup like the insructions said where i turned the bronz {coarse adjuster untill the ball inside stopped moving and i turned the blue {fine} adjuster clockwise till it stopped then turned it counterclockwise twice. I hear a sound like air comming from the boost controller but dont feel anything. the vacuum is fine atidle. But when i press on the gas the boost just keeps going and going. I try to stop it when it passes 20 psi but has gone to 24 psi once. The last setting i used was the course adjuster was opened counterclockwise about 3-4 turns. The boost got to about 21 spe then a LOUD screach was heard so i gave up and parked the car. PLEASE help me guys.

 

Dude.. the arrow is for in. So it should be from the pressure source (manifold, bov) then the bottom of the MBC and goes to the wastegate.. from your description you got it reversed.

Brass nipple from pressure source, blue nipple to your wastegate.

 

i connected the blue nipple to the wastegate and the brass one to the bov tap. Still boosting infinitely. I even closed the coarse adjuster all the way and it still kept boosting. I have no idea what is wrong. the turbo outliet is capped, the factory bc is capped, the hose from the intake is capped. the blue is connected to the wastegate and the brass to the bov tap. Did i do something wrong?

 

are you using TurboXS Standard Boost Controller or TurboXS High Performance MBC?

I'm using TurboXS High Performance MBC and it has the spring and ball. What I did (which was mentioned here before) was to loosen the ball and spring screw till you can hear that ball move when you shake the MBC then ran that (boost was peged at 10 Psi at this point. Then slowly tighten that half a turn at a time and ran it gain till boost came up. Then after that when i reached 18 something PSi, I turned the upper screw till i got 19 Psi. Test driving each time I made an adjustment (used 4th gear wot run as a test point) this is the safe way of doing it so you wont over boost. (from what I read here) that worked for me.

coarse should be loosend before you start tightening it. If I remember it right, if you tighten coarse then you are increasing boost.. so start from loose then slowly tighten.

 

did you start with the coarse screw mostly counterclockwise or clockwise? From what i understood clockwise is less boost and coutnerclockwise is more?

 

Ok.. the crew moves kind of funky, all I remember is, when you turn the screw and it starts to move out (towards you, that is loosening it out) less boost.
turning it going inwards (away from you) increases boost.

Loosen the screw and shake the MBC, if you hear the ball bounce around, then start from there. turn the crew a few times and shake it ever time you make a turn till you don't hear the ball shake would give you an idea of the direction the screw needs to be turned.

if feel or hear the ball moves -> no boost
ball does not move -> more boost +.

Start with no boost first. then turn the crew half a turn at a time then test drive it while watching your boost gauge.

If you tighten the screw that is more boost. that is why your boost is way up.. turn the other way, almost all the way.

 

Wait.. hmmm counter clockwise is more boost, clockwise is less boost.. right.