I'm running 14 psi on my teg using an 18g. For the past 3 months it has held no problem. Just in the past few days it began overboosting. I'm using the same mbc, and everything is the same, so why all of a sudden would this happen. I checked all connections and they are ok.

 

bump

 

Cracked Vacuum line somewhere? Does it overboost all the time?

 

If I use the same line and splice it straight through without the mbc the boost comes on fine.

 

It's ballastic man!

 

sounds like your mbc is craping out.

 

I have a turbosmart mbc and it's always been right on. What parts could fail?

 

maybe the internal spring perhaps

remove the MBC and see if you get consistant (altho less) boost pressure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo E 604 &raquo;</TD></TR><TR><TD CLASS="quote">maybe the internal spring perhaps

remove the MBC and see if you get consistant (altho less) boost pressure.</TD></TR></TABLE>

The mbc I'm using is the turbosmart gated valve and it does not have a spring. Can the actuator on the turbo get lazy over time?

 

not sure, but i'd remove the MBC just the same to avoid blowing your motor

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo E 604 &raquo;</TD></TR><TR><TD CLASS="quote">not sure, but i'd remove the MBC just the same to avoid blowing your motor</TD></TR></TABLE>

try that first.

 

try a different vacuum source and make sure to recalibrate your mbc