Could someone please help me with a mbc installation on a 1g?

[Deadly BlaZe]

i've looked through like 232453 different threads trying to figure this but still didn't get it. Almost all of the instructions were for a 2g (not sure if its the same for a 1g) but it seems like the hoses are routed different, i've looked at this pic and it just didnt make sense

any help would be appreciated. oh and please dont show me other links to threads...i've probably seen them all. i'm not too familiar with the vacuum lines around the turbo/intake so could someone help me out please? thanks

 

[Deadly BlaZe]

10 psi on the boost gauge or your air compressor? In any case, 20 psi on the boost gauge is your final goal, time for a re-test.

on the air compressor. what do you mean by boost gauge?

 

[oldman]

on the air compressor.

Thought so, the gauge on the compressor indicates how much pressure to pump into the intake tract, not how much pressure the intake tract was holding.

what do you mean by boost gauge?

When you leak test, your boost gauge will move indicating how much pressure the intake tract was holding.

 

[Deadly BlaZe]

oh ok so let me make sure i get this. I should pressurize the system at 20psi (on the compressor gauge), and see how long it stays on that pressure on the boost gauge?

 

[oldman]

I usually set it at 30psi since I'm testing to 25psi, 25psi should be sufficient for you.

 

[Deadly BlaZe]

I usually set it at 30psi since I'm testing to 25psi, 25psi should be sufficient for you.

I got the concept right though correct?

 

[oldman]

oh ok so let me make sure i get this. I should pressurize the system at 20psi (on the compressor gauge), and see how long it stays on that pressure on the boost gauge?

No, set your compressor at 30 psi and forget it, pump air into the system until your BOOST GAUGE reaches 20psi, stop pumping and allow no more than 30 seconds before the BOOST GAUGE drops to zero. I have a strong feeling that you have bunch of leaks and your boost gauge won't even reach 5psi.

 

[Talesin]

Actually, I had my MBC set up from the 'J-pipe' nipple to the wastegate actuator, and was getting horrible amounts of shift... hot days, I'd end up only boosting around 12 or 13psi, cold days would take me as high as 20. 'Average' days would keep me at my desired level of 15-16.

Swapped over and teed the CBV ('bov') vac line to the MBC to the WG actuator (as in the above diagram), capping off the 'j-pipe' nipple, and now I just see about 1-2psi boost surge, with almost no fluctuation between hot summer and cold winter days. Weird.