I am having problems with my evo and don't know why. I recently installed a Buschur Racing FMIC and my friend custom made me upper&lower intercooler pipng and an intake. Since then, I've only been able to boost 10lbs on full throttle. I'm pretty sure it's not a boost leak cuz i looked over everything and nothing seems to be leaking. Is there a way that we might have hooked up the boost lines wrong, or maybe something else that has been over looked? i appreciate any suggestions on what may be wrong. thanks.

p.s. does anyone have a diagram showing boost lines on the evo, so i can make sure mine are put on right? thanks.

 

Did you do a boost leak test? You cant just look at it and say or think theres no leaks. But it does sound like you have other issues besides a leak

 

hey i know this isnt much help... but did you check the lines coming from the back of the intake? one of them goes to the stock boost controller. im not a expert but thats what i would think since you replaced the intake piping.. Good luck

 

see here, I used this for my MBC a long time ago, and it's the best diagram- caue it's simple. Don't forget that the tubes for the boost controller have little pill restrictors that affect the flow.
https://www.evolutionm.net/forums/sh...hlight=hallman
here is the diagram:

as you can see, it's simple, easy to understand, yet it works.

 

i'm not sure which ones you're talking about. would it help if i posted up pics of how my boost lines are connected?

 

this is how my boost lines are set up now. could this be the problem??

p.s. sorr for the quick MS paint butch job of the other pic...

 

Whoa, what the hell is that? You have tees everywhere - it's a tee factory. That's DEFINITELY why the boost doesn't work. That's also one of the most hilarious boost hose connection schemes I've ever seen. You have everything connected to each other - truly inspiring.

Ok, when you posted this diagram, did you look at the proper diagram posted right above you? I would think if you looked at the good one and looked at yours, it would be obvious, no?

Anyway, you need to have one line from the WGA to MBC and one line from the pressure source to MBC. In your diagram, you have the WGA line CONNECTED to the pressure source directly. Maybe you did this, because the stock system has a tee there and then sends one line to the BCS? Well, with an MBC, you don't connect the WGA and pressure lines. They go directly and independently to the MBC.

Also, I'm just assuming you have an MBC due to all those brand names listed in your sig, although the WHP numbers are atrociously low, so I dunno. If you're using the stock boost system with all those mods, then the diagram is off in a different way. with the stock system, you have to use the OEM hoses with restrictor pills, and there should be two short hoses coming from the turbo and wga (not the bov) that meet at a tee. Then, from the tee there should be a long hose going to the BCS (stock boost controller basically).

Lastly, you can't just randomly look at your car and think there are no leaks. We aren't talking about fluid leaks here . We're talking about boost leaks that ONLY surface when under boost, which means you have to apply compressed air and then listen or look by spraying soapy water.

 

that can't be right.....
I'm guessing that you DONT have an MBC....
You should have removed just the line that conects to the intake pipe, and then replaced it after installing your intake - most aftermarket intake pipes come w/ the nipple right?
I'm gonna check my car and see what I did on the intake pipe, since it's been so long, i don't remember anymore.

 

The intake pipe line isn't important, but it may have led to his confusion. I don't think he is on the stock BCS, because there would have been no reason for him to tap into the BOV line.

 

Maybe he recycled the stock lines w/ the pills in them for the MBC?
It's possible, if he bought the MBC second hand w/o all the lines and stuff.

 

Off topic: There are so many threads about boost problems, I think a mod should sticky a FAQ about stock boost and mbc installs. It makes the search function a lot easier on all of us!

 

after rereading the original post, I have a few questions. Are you ricirc or vta.
did your friend make you an intake pipe?
also, if it's "custom made" piping, I would to a pressure test.
what type of bov also?

 

ok. my friend did indeed make me an intake pipe as well as intercooler piping to work with my mini battery and BR FMIC. he does know what he's doing cuz he does this for a living. As for the car, I DO NOT have a MBC. My friend put the i/c on as well as the pipes, so he connected it the way it currently is. i knew that something wasn't right cuz it seemed to be running way low on boost, but didn't know how the lines went connected or where the problem may be.

edit:: I have a recirculating turbo xs bov.

 

If you don't have an MBC, then there is a hose that connects to the stock wastegate actuator. it's complicated to explain, but it was on the bottom of your stock intake near the Recirc hose. You cap this off when you add an MBC.
I'm guessing that this was not connected
If you look at the diagram that i posted before, you will see in blue the area that says cap next to the turbo, and the maf.
I'm guessing that maybe your friend didn't build in a nipple on your intake to connect to the stock wastegate actuator, so your actuator is opening at 10PSI.

check that first.

 

Okay, I found a more helpful diagram while researching this.
Ignore the part in red- that says remove these, and you will have the basic routing of all your lines for wastegate, turbo, intake, and actuator.

confirm that this is the way your actuator hoses are set up.
a common problem when setting up an MBC incorrectly is the ability to only boost 10-12 psi.
Good luck.