SK1 max boost?

[jcu]

hey guys i have the ASA SK1 kit what RPM's do you usually get max boost?

[crazy1323]

you will always get max boost at redline. However, no matted what rpm the engine is at the cy;inder pressure is the same. Think about it, for every time the crankshaft goes around the piston goes up and down, and the pulley spins the supercharger. This means that for every time combustion occurs the pulley spins "X" times. I hope that this helps.

[2003330i]

you will always get max boost at redline. However, no matted what rpm the engine is at the cy;inder pressure is the same. Think about it, for every time the crankshaft goes around the piston goes up and down, and the pulley spins the supercharger. This means that for every time combustion occurs the pulley spins "X" times. I hope that this helps.


please explain further

[Elefant]

please explain further
http://auto.howstuffworks.com/question122.htm

[jcu]

so let me sum it up, if i understand correctly! S/C's deliver boost progressively so it means you get your highest boost possible at the point where the engine produces its peak power or peak RPM? as opposed to turbo's wherein its either on or off boost? did i get this correctly thanks guys!

[crazy1323]

If you were to simply hook a guage up to a static tube closed at one end, the supercharger would gradually increase power untill the engine reaches the rev limiter. However. Lets say you make "X" psi at 2000 RPM's. You would make "2X" psi of boost at 4000RPM's however, the engine is using the air twice as fast. Basically, the supercharged dyno graph with look almost identical to to factory graph except the "y axis" values will be much higher on the superchargered one. I hope this helps. If this is still unclear PM me and you can call me and I will explain.

[OrientBlue323i]

Actually, a centrifugal flows at the square of RPM, its not really linear. Hence why it boosts in higher RPMS and sucks down low.

[Mr Paddle.Shift]

Actually, both of you are right, iff (short for if and only if) you define where you measure boost.

The squared of RPM relationship with boost refers to where boost is measured directly at the outlet of the compressor. Just find a compressor map and you can see the relationship easily.

But the common notion about boost in daily conversations, online forums etc, refers to what's being pressurized inside the manifold.

Take a moment to think about this. There's bound to be pressure loss from the outlet of the compressor, through the IC, pipes and finally into the manifold. So it's ok to claim that boost in manifold is almost linear to RPM. I'd use almost linear because almost all variables of any system in the real world out there have non-linear relationships. The reason why engineers linearized them is to help with modeling and analysis.