I am frustrated beyond belief. So I got my XEDE yesterday, bought it used so was trying to update the firmware, thats a whole nother story in itself, but anyways, I took off my Hallman MBC and attempted to return the vacuum hoses to their stock configuration. Car started and ran but I could only hit ~12.5psi. Figured I may have had the vacuum line/boost source crossed so I flip flopped the two, same result ~12.5 psi. Now I didnt put the T down low where the factory had it but rather up higher under the intake closer to where it attatches to the solenoid. Was that my problem?

So I decide I'm gonna put my hallman back in. Reinstall the hallman. Getting ~12.5 psi in 1st gear, then it 2nd it rockets thru the roof, like 25+ psi, No I am not driving around like this nor am I flooring the car. I am staring at my boost gauge and when it hits ~22.5 (Defi D- Series) where I want, I was letting off and it would spike that high. Now my motor is blown or anything like that, my question is why is my car hitting so high of boost ?

I have a Hallman Pro RX w/ the heavy spring in, its turned ALL THE WAY DOWN.

 

I think you have the wastegate and pressure source hoses backwards. Go make sure the side of the Hallman is connected to the wastegate actuator nipple, and the bottom of the Hallman is connected to the turbo nipple.

 

Thats how I have em', the boost controller was working fine yesterday until I took it out and attempted to return the car to a stock config (XEDE controls the boost, once its installed). Then I put it back in and now this, problem is I have a 1000mi road trip tomorrow morning!

 

Is the Xede interfering with boost in any way, or is the BCS completely out of the loop? If there are only 2 hoses going directly from the MBC to the wga/turbo, then this should be simple. Double-check the hoses just to be sure they aren't switched - I did this once even though I know how they go. If they are 100% correct, then check the WGA nipple to ensure it's not bent, and make sure there is no pinch in the WG line. Be sure you didn't use any of the stock hoses with a restrictor pill, and be sure the Hallman isn't randomly turned up really high - turn it all the way down then test it in 3rd.

 

Checked and double checked the lines on the MBC, they are on as you said they should be. Car is only boosting 12.5psi in 1st then if I go hard into second it will boost to 25+psi. The XEDE isnt hooked up, its the reason I tampered with a perfectly good setup in the first place. I bought brand new hoses for the reinstall. Could the be a problem w/ the wastegate actuator arm, its like the wastegate stays open until there is a large enough load on the motor then it is getting stuck closed, I dont know what to do, I didnt mess with the turbo at all, I obviuosly have the boost source since I am making boost, thats what leads me to the WGA arm

could my diverter valve have anything to do with it?

 

prolly should post in the vishnu forum, it might go unnoticed here. The guys that hang out there usually know whats going on

 

But the XEDE isnt on my car, this has nothing to do with Vishnu!

 

So hows pauls car running?

 

Actually with the Hallman you have it backwards, the wga nipple goes to the bottom and the boost source goes to the side.

https://www.evolutionm.net/forums/sh...ht=hallman+mbc

 

In case this wasn't brought up, you have to use the stock boost control hoses if you're using the stock boost conrol solenoid. They have little pills in them. Do not use the stock lines when hooking up the MBC. Also, make sure the little bleed hole on your hallman nipple is on line of the WGA, not the turbo outlet. Just hoping this could help. Or one other thing, it could be a bad wastegate actuator. It happened to me a few weeks ago. No boost control what so ever. Yours just might be stuck open, not closed like mine. Hope you get it worked out.

 

actually i think u 2 are just confused on which is the side and which is the bottom.

I look at it the way warr does

 

Car is boosting fine now the bottom of the hallman is the one with the little bleed hole, the side of the hallman is what hooks up to the turbo, this is fact, I just switched the lines and the car works fine, I have the wga nipple hooked up to the BOTTOM and the turbo nipple hooked up to the SIDE, holding 20psi perfectly fine now.

 

the hallman sits in the car with the adjustment knob facing right or left, not up or down

either way I appreciate all the input, car is in working order now.

PS I think you are correct, 2 different view points, I see how he could have explained it his way and still been right, I looked at it from the point of view w/ it already in the car and mounted

 

The nipple on the hallman pointing directly opposite of the control knob is the solid nipple with no hole connected to the boost source, IE BOV line or turbine outlet line. The hallman nipple on the side is the one with the hole going to your WGA. In other words, pretend the hallman is a bottle of coke. If the base of the bottle is the MBC knob, the cap would be the solid nipple from your boost source. The side of the bottle would be your outlet with the nipple with the bleed hole going to the WGA.

I cannot make it anymore clear. I am 100% certain this is the correct way for the Hallman MBC.

 

Same **** happend to mee....and i have a greddy Boost gauge it would go past 2.0 bar and i would just stop and drive like a grandma cuz i dont want anything to happen to my car.....How can i bring it back to my old boost 22psi (ams MBC) Plz help