Hi

Been at this since last night on how to hook up the Hallman mbc to the Tial wastegate with no luck.

I currently have it set up as follows:

The side port of the wastegate receives full pressure from the blow off valve, in which I teed into. I have the exit nipple of the boost controller connected to the top port of the wastegate and I have the entry side of the boost controller connected to the T in which I joined the side port into.

My compressor does not have a nipple on the housing for me to send air to my boost controller. Instead I have teed into the BOV as stated earlier.

Should I rather get my air source before the throttle body instead of teeing into the blow of valve. I have taken off the vacuum lines from the bcs
solenoid but have still kept it connected electrically.

When I disconnect the top port of the wastegate and connect the boost controller inline with only the side port then I have full control of the boost
but the problem is I have a lowest setting of 16 Psi and a max of only 21 Psi which was within the full range of the boost controller turned closed or all
the way open. On the top port of the wastegate running the same system the lowest I can get to with the boost controller fully closed is 25 Psi at
which point I take my foot off. Basically I cannot make incremental changes in between.

Please help. Any advice would be great.

 

Forgot to add I am running an ETS GT3076R turbo kit.

 

Originally Posted by oldman
Trust me Paul #1, I have done alot of research on this and I have a brand new TIAL 44 from Extreme PSI sitting right in front of me with instructions to use only the side port and VTA the top port with MBC, on the top of the instruction sheet there is a *NOTE* For electronic boost controller installation, use the manufacture's instruction.

Let's break it down into different situations for better understanding.

1. With both ports open, much like leave the fitting on an internal wastegate fitting open, the wastegate is suppose to hold approximately 2x the spring pressure (its ability to hold back exhaust pressure). Example, 14psi spring = 28ish psi of intake pressure.

2. No boost controllers but both top and bottom connected to straight intake pressure, the result is the same as #1, 28psi.

3. No boost controller but with side port connected to intake pressure signal and top port VTA, much like running no MBC with an internal wastegate, the wastegate will hold exact the spring pressure. Example 14psi spring = 14 psi of intake pressure.

4. EBC or bleeder MBC, side port sees intake pressure (which will result in #3), the outlet of EBC or bleeder connects to the top port, for every psi the top port sees, there is one PSI increase in intake pressure. Note, a bleeder MBC will work in reverse in adjustment as in an internal gate environment, the more pressure you bleed off, the less the top port sees, the lower the boost level.

5. Ball/spring MBC, top port VTA and outlet of MBC connects to the side port. No pressure will be sent to the side port until the spring pressure in the MBC is overcomed, just like an internal setup. The reaon a ball/spring MBC doesn't work with the top port is because you have no control over exactly how much pressure to send, either you get nothing or you get everything, unlike an EBC or bleeder MBC. Let's put it in examples of running a ball and spring mbc using the TIAL instruction, assuming the wastegate spring pressure is 14psi.

A. MBC all the way out (no pressure on the ball), top and bottom port sees the same pressure, you get #2, 28psi.

B. MBC all the way in (max pressure on the ball), nothing gets sent to the top port, you get #3, 14psi.

So far so good but the problem is contolling boost pressure in between.

C. MBC set to anything between 0-14psi, as soon as the ball gives, the top port will immediately see the same pressure as the side port, you'll always get #2, 28psi.

D. MBC set to anything 14psi+, the top port will never see anything at all because the side port will open the wastegate before the ball is overcome, you'll always get #3, 14psi.

Hope my explanation isn't too confusing.

Lastly, to get away with using a smaller wastegate spring while trying to run higher pressure, you leave the side port open, 28psi, then for every psi you add to the top port, you get 2psi more in intake pressure.

Many thanks to Oldman



I hope this helps you.

 

I have a forge MBC. lower port from Tial connected to side port of mbc. Lower mbc port connected to LICP works perfect

 

pressure only source to inlet of MBC, outlet of MBC to bottom wastegate port

Done.

 

You NEVER tee the BOV with the wastegate! What the hell? Top port when using an MBC is always left OPEN/VENTED. MBC outlet goes to the side port of the wastegate like mentioned above.