In a supercharger application, the Compressor wheel is activated by a pulley that is held against the belt. The belt spins faster and the Rpm goes up, so the pulley goes faster as the belt goes faster as well right. In a Supercharger I think you reach desired boost at lower RPM or something like that... Meaning that you could be at 7 psi at 3500rpm.

By the time you reach 6000rpm, the cfm and velocity of the air comming out of the outlet is way gretter than it was at 3500rpm so the boost level, if not controlled, is rising as well.

So my question is: What part ensures there is no overboosting??? What part ensures you stay at 7 psi no matter what Rpm you're at(assuming you reached desired boost level)?

There as got to be a part that releases the excess of compressed air?

 

good question and you are right, there is a part (2 actually) that release excess compressed air. the vortech units come with a built in waste gate, so when your idleling, it is not only sucking in air, but also letting it out

on top of that, ripp has a specially designed bov to that performs the same function turbo bov's do, just made for ripps kit

now from what i've been told, superchargers do not overboost because of the pulley size. pulley size controls rotation, which controls how fast the compressor spins and the amount of boost your pushing. so if you have the right setup, you cant' overboost.

another thing to consider is the way the supercharger builds boost: as the engine rpms go up, so does the boost. i don't believe you would be pushing 7psi at 3500 if thats your peak boost, just an example.

one more thing to take into mind is volumetric efficiency and this is pretty important: the blower will only push as much air as the engine can take. opposed to a turbo that doesn't really care, it just crams it all in, if your engine is very free flowing (ported everything) then you have greater volumetric efficiency and can boost higher safer

 

Thanks for the info Now here's another one but turbo related. And this is all assumptions. Let say your wastegate goes to crap and your tubo keeps on building up boost. Is there something that can be put on the intake pipe to release excess boost? Would a regular BOV be able to bleed the excess?

 

i wouldn't think so. thing with the wastegate i believe is it sees "ah crap, i'm at 7psi, better start bleeding it off now"
ok, so maybe it doesn't talk, but you get the idea

the bov is just there to release compressed air when your tb butterfly is closed, it doesn't know much psi your pushing nor does it care

bottom line (and someone will correct me if i'm wrong) but if your wastegate goes to crap, you will keep building and building boost until your engine blows

 

So there is nothing than can be put inline(between the Turbo Outlet and the TB), that can bleed boost up to a set amount of Psi???

 

If you have a good wastegate, I wouldnt worry. I havent heard cases of external wastegates failing very often. But if it does fail, you will see evidences of it, but to answer your question, you will keep building boost until your engine fails.

 

thats were a good gauge comes in handy, so keep an eye on your boost

the turbo is pretty much indifferent, it doesn't care about efficiency or how much boost your stuffing down, it will cram as much compressed air as it wants to (or as much as the wastegate or boost controller will allow)