OK recently did a boost leak check and fixed all my vacuum leaks. I went as dar as replacing all my vacuum lines and zip tied all of them. Checked and no leaks. The car would boost 30.8-31.7 with no issues. Then yesterday I went to do a log and it first hit 27-28 then second log only hit 25. I tried again that evening and same solid 25.6-25.8 psi. Then this morning after going over the car again I tried again and turned the Hallman MBC up a turn, the car hit 27psi so did another half turn and if stayed the same 27psi so half turn and log again same result. I can't get past 27psi. I am lost as what else to do.

I am is usejng a Hallman Pro Rx Stiff spring ceramic ball.
TiAL V44 Brand new as a friend had it in his stash of parts still wrapped up.
Vac source is off the manifold. I have it ran like this.
Vac Nipple to a T then to another T one feeds the boost gauge, one feeds the Hobb Switch and the first tee feeds the MBC.

 

Did you do leak test again after seeing the boost drop?

 

Only leak I see is from the bleeder Hole in the MBC.

 

I would re-route my hoses to bypass the MBC also. I would try to pressurize and hold it at least 5 sec at target pressure.

 

How would I do that?

 

How to pump the system full of air or how to bypass the MBC?

 

Bypass the MBC lol.

 

Just loop the vac line to by-pass the MBC.

 

Did the low boost problem develop aftet instslling the new BOV?

 

.....Vac source is off the manifold. I have it ran like this.....Vac Nipple to a T then to another T one feeds the boost gauge, one feeds the Hobb Switch and the first tee feeds the MBC.[/QUOTE]

Whoa! If I may say so, this is a complex hodgepodge, indeed!

 

Whoa! If I may say so, this is a complex hodgepodge, indeed![/QUOTE]

How is that? 3 ports on the stock manifold. One dedicated to FPR, One to the BOV (Largest) last port has 2 tees so I can run the MBC, Hobb Switch & Boost Gauge. Never got a new BOV yet still looking for a trade or buy one. If you mean the wasregate that's been on four several months.

I found a leak well two. The TiAL QR O-Ring was ripped and one line on a tee was leaking. I'll check again Tomorrow and update the thread.

 

Too much going on with one vacuum line. You can tap your LICP for a fitting for your boost control. Having dedicated lines works wonders, because a tiny hole in the long line going to your boost gauge will affect your Hobbs switch, and your boost control. Good luck.

 

I see. What i might do then is just tap my compressor cover on my turbo instead.

 

Check the oring in the BOV when I put mine on I crushed it and that was the source of my leak.

 

I replaced the O Ring last night. I think its leaking on the line still so. I'm going to tap the compressor cover on my turbo and run the MBC there.