boost leak?

[timloomis]

Ok I had my mbc tee'd from the bov,and it was running 15psi.Found out that was a bad idea,so I hooked it back up into the turbo outlet.It dropped 4 psi on the boost gauge,and I didnt touch the mbc screw.I thought it would be the opposite if it was a boost leak.Also,I did a log today and my idc was 89% at 5400 and 13-14 psi.Now I'll watch my idc's,and they jump around at wot,highest I've seen before was mid 70's.Are they supposed to jump around like that?

 

[majik2k5]

When you run the MBC from the BOV line, you get inaccurate boost control. Rerouting the boost controller will give you more accurate boost control. I dropped 3pounds when I ran mine the correct way, so that is to be expected. It probably wouldn't hurt to do a boost leak test anyway, regardless of the situation.

 

[thilaksharma]

checkup on the mbc on another turbo car
sometimes, custom mades are scrwd

 

[timloomis]

Well I did another log.I think my timing is off or I have a huge boost leak.Knock is high,around 15 or more,but my timing goes down then comes back up,even when knocking that high.And my idc's are sky high,96% is the highest its gone now.

 

[timloomis]

Turns out my crank pulley separated and my exhaust cam was off 1-2 teeth.