This is just a general kind of question.Like say you have 2.2 liter engine and t3 turbo with a .60ar.How much boost could that turbo produce with like a 6500 redline?.Would boost just keep on building if it were unchecked by a blow off valve or does it level off somewhere...Sorry for the noob question but as I'm a noob it kind of fits.

*L*and don't worry I'm going to use a waste gate and blow off valve

 

Maxium boost would be determined mostly by the engines ability to consume air. It will be less influenced by things such as altitude, temperature, humidity, you get the idea. The blow off valve has nothing to do with max boost (unless it is leaking). The wastegate determines boost levels. If unchecked boost spikes, then will usually taper off. With the setup you mentioned you might see a 35 or 40 psi spike and it would probably taper to 20psi by redline as the engine consumes more air.

All the blow off valve does is release pressure between the turbo making boost and the throttle body when you lift to shift. If the BOV didn't release this pressure you might blow your charge piping, and you would surge your compressor. The bigger the compressor, the worse surge is on it.

 

 

Oh okay I get it.SO the waste gate bleeds of exhuast pressure to the wheel and the turbine doesn't spin as fast therefore less boost because the compressor isn't spinning as fast.And the blow off valve just releases pressure so you don't surge the compressor or blow the charge pipes.With the engine suddenly stopped and the comprresor still creating boost for a second it could be like making a pipe bomb out of your charge pipe?

And thanks for the help I have a little more understanding now.

 

Ive heard alot of people say that about 1.5 psi of boost is lost after it goes through the innercooler.So when I set my wast gate should I adjust it to like 9.5psi If I'm my goal is 8psi?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dmc1 &raquo;</TD></TR><TR><TD CLASS="quote">Oh okay I get it.SO the waste gate bleeds of exhuast pressure to the wheel and the turbine doesn't spin as fast therefore less boost because the compressor isn't spinning as fast.And the blow off valve just releases pressure so you don't surge the compressor or blow the charge pipes.</TD></TR></TABLE>

Sounds pretty good. Its not that the compressor is spinning to fast, but that it is spinning with no place to put the air as the engine would no longer consuming it.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dmc1 &raquo;</TD></TR><TR><TD CLASS="quote">With the engine suddenly stopped and the comprresor still creating boost for a second it could be like making a pipe bomb out of your charge pipe?

And thanks for the help I have a little more understanding now.
</TD></TR></TABLE>

If the engine was stopped it would not be combusting fuel/air and the bov would relieve most of the pressure that the compressor was still exherting.

Think of the wg as a regulating valve and the bov as a relief vavle, it makes it easy to understand for me cause I'm a dumbass.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dmc1 &raquo;</TD></TR><TR><TD CLASS="quote">Ive heard alot of people say that about 1.5 psi of boost is lost after it goes through the innercooler.So when I set my wast gate should I adjust it to like 9.5psi If I'm my goal is 8psi?</TD></TR></TABLE>

run your boost guage off your manifold, and set your wastegate til you see 8 psi.

 

so I just run my boost gauge off of the Intake manifold and then I'll know how much boost is actually getting to the engine

 

yes, aside from innacuracy in your boost guage. If you tune it, or have it tuned, yhou can check that via your map sensor. But yes