mbc help

[90gsx_luis]

ok, so im having a hard time trying to figure out what is wrong with my boost levels, first I connected my mbc to the vaccume line going to the bov with a tee to the hallman then from the hallman to the wastegate actuator. Well guess what same boost level, I played with the mbc for a bit made some runs and nothing, nothing at all. So I kept looking on the forms and saw a different diagram on how to connect the mbc, so I tried it. I connected the mbc from the nipple right after the compresor housing straight to the hallman and from the hallman right to the wastegate actuator. So I take it on a quick run and WAY WAY to much boost. My boost gage was going past 20, I pull over and disconnect because i was scared it would hurt my engine. The mbc that I have is the Hallman ES. I need someone to help me please

 

[MrBoxx]

You'll need to adjust your boost controller down to the minimum boost you can run, then keep it connected to the line between the compressor housing and wastegate actuator. Do NOT use the BOV line for anything other than the BOV.

 

[90gsx_luis]

the boost controller was turned all the way down when i was getting more than 20 psi, could it be broken ?

 

[b00stAdict]

You'll need to adjust your boost controller down to the minimum boost you can run, then keep it connected to the line between the compressor housing and wastegate actuator. Do NOT use the BOV line for anything other than the BOV.

+1

i agree with MRBOXX.

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hope that helps

 

[90gsx_luis]

yeah thats the diagram i used to help me connect my mbc. When i connect it the same way like in that picture i couldn't control my boost, it was turned all the way down and i was still geting to much

 

[streetdsmpwr]

You'll need to adjust your boost controller down to the minimum boost you can run, then keep it connected to the line between the compressor housing and wastegate actuator. Do NOT use the BOV line for anything other than the BOV.

But Vfaq tells you to tap the BOV vacuum line.

 

[MrBoxx]

VFAQ in this case, is wrong.

The proper place to tap a pressure source for an MBC is between the compressor or intercooler pipe and the wastegate. The BOV operates by assuming it has an uninterrupted vacuum signal. A manual boost controller operates by allowing boost to escape the system at a controlled time and controlled rate. You don't want to "lose" air from the BOV vacuum signal. Thus, you don't tap the BOV line for anything. Leave it alone.

 

[90gsx_luis]

could there be a problem with the mbc ? or is it something else

 

[ExpresS]

+1

i agree with MRBOXX.

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hope that helps

Sure this diagram is cool and all but what IF there is no nipple on the compressor housing or j-pipe?

 

[MrBoxx]

Then you need to drill and tap the compressor housing or, preferably, the J-pipe/IC pipe, and use the proper fitting in the hole you just made. A wee bit of JB Weld around the fitting where it threads into the pipe will help keep it from leaking.

 

[ExpresS]

Then you need to drill and tap the compressor housing or, preferably, the J-pipe/IC pipe, and use the proper fitting in the hole you just made. A wee bit of JB Weld around the fitting where it threads into the pipe will help keep it from leaking.

Like actually making a "bung" on the j-pipe?

 

[MrBoxx]

Well... sort of. You could attach a new external threaded bung on it, but most people just drill the pipe, tap the hole, thread in the new fitting (available at any auto parts store) and away you go.