My Roush intercooled supercharger setup is working great finally. I was wondering whe is the charger working best? Do they only work at WOT or is it always working?

 

It depends what you mean by "best".

It's providing out the most pressure to the combustion chambers for a given RPM at WOT.

If you have a boost gauge, you'll see that you can spin RPM and not necessarily produce boost.

 

I want more boost

 

You'll notice a difference when the temperatures start to drop. I imagine up north ya'll are having some relatively cool weather right now. Also notice a difference on days with high barometric pressure. As the temperatures dip down into the 50's - 60's you'll really see how much a blower likes cool air...

 

I think he is refering to idle, cruise, WOT, load, etc..

Do you have boost gage? That will help you understand when it is boosting. Usually under any load its working. Idle produces the most vacum = not really doing anything. Cruise is usually still vacum but not as much = helping a little. Towing or accelerating is usually minor boost = helping quite a bit. WOT is the most boost you setup can deliver = giving it all it's got.

So it works almost all the time.

 

If the intercooled tune is like mine then that thing is either ON or OFF. The Roush S/C has a bypass valve that determines when it works. Driving normally, accelerating, idling, cruising, it never boosts. You can still hear it whine under accel slightly because it is spinning but it will NOT be engaged and won't make any boost unless you press the pedal down far enough that it switches the bypass valve on. I can watch my boost gauge and it will be vacuum until I press the pedal to that point which it closes the valve and then the boost jumps up to like 4-5 psi and if I press the pedal on down it wll make up to 8psi. The exhaust tone also changes when this happens and the whine goes away when boosting LOW levels like half throttle and you can hear the air blowing, but if you press it down to WOT it whines again and you get full boost. Kind of wierd, I haven't tried disconnecting the bypass and driving it, it tells you not to in the roush install book, but it would seem that it should be ONLY open if you are idling, otherwise it should be engaged. The clutches on the superchargers of AMG's at work work this way, they are only disengaged at idle when sitting still.