Max boost on a supercharger
 

What's the highest boost being run on stock blocks with supercharger ....I seen a few post with 11 lbs ....is that average ?

I guess what is the reason you ask? Are you looking to copy the max boost? Are you trying to figure out rod strength?

boost is boost; a supercharger just robs power to spin it.
i've seen people on here advertising close to 15lbs. (+ or -) my car is N/A so i haven't a clue what the most one can withstand.. ;)

Well, psi is meaningless without knowing airflow. 5 psi out of a huge turbo/sc is more air than 15 psi out of a tiny one.

Putting a boost gauge in the intake w/same piping from large or small turbo changes nothing; but maybe the temperature of the air. 10psi is 10psi....explain Chuck33079 ?
I know a tiny turbo/supercharger will get hotter than a larger one (resulting in hotter air & power loss) but the pressure of boost is the same.... :)

Boost is a measure of restriction. 10 psi out of a huge turbo is a whole lot more airflow than 10psi out of a small turbo.

I agree with that statement: but put the gauge in the intake & 10psi is still 10psi, it could be a 50mm turbo or a 150mm turbo...still ,adjusted to 10psi at manifold they are = ...yes,you have plenty to spare w/a larger one...but entering the combustion chamber is still 10psi.

I don't know about that. 10 psi on my ST made 533whp where 10psi on my SC made 489.

Yep; because your sc was robbing power; but was still 10psi.


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I can see that.

Well I was trying to decide on a pulley size .. I'm looking at a 85mm pulley for the stage 2 gamma kit ... I'm thinking on setting the rev limiter to 7k and I should be around 11-12 psi

I apologize for contributing to steering your question in a different direction: hopefully no harm/foul.... But I see Top Gun Z has had both- so he may have better insight.

It boils down to CFM. A small turbo at 10 psi may put out 1000 CFM. A large turbo at 5 psi may put out 2000 CFM. So which one puts out more air? ;) Or look at it this way. You have a 2 garden hoses. 1st one is a 1/2" hose. The 2nd hose is 1". You know the water pressure is 55 psi. Normal household psi. Which one will fill the water bucket up faster?

So,what you are saying is: that with a boost gauge plumbed in the intake plenum & both super chargers/turbo's,big or small/ set at 10psi of boost (reading on gauge)-the larger Forced induction feeders will put more air into the combustion chamber?
I say that they are very capable to;but 10psi of boost (constant) is still just 10psi of boost.
that's why there are waste gates & blow off valves/in case of over boosting with the larger air pumps.
we're feeding air through the same intake at 10psi....not a firetruck doing a pump test w/multiple size hoses.

Rusty is correct. Different forced inductions units at the same PSI can have widely different air flows. If you're curious, pull up flow charts for different turbos and compare their CFM at the same PSI.