crewgirl said:
Nope, head's done. No matter how much more pressure you put to the intake manifold, you don't get anything more past the valves into the cylinder. Imagine running a big leafblower (say, S400) through a straw. The compressor basically 'backs up' - the compressor pressure ratio jumps, efficiency drops off and the temperature of the compressed air skyrockets. Realize, this isn't a sudden thing, but gets compounded quickly by low-flowing heads / manifolds and little or no cooling.
C.A.P said:
I skipped all this chemistry BS but this I CAN TELL YOU GET BACK ON TOPIC AND NOT YOUR OWN PEDESTAL . Banks thred about the banks truck not your agendas !
If that was directed at me, C.A.P., this is actually about the Banks truck. Sorry if you don't like the chemistry BS, but it's a necessary evil sometimes if you want to understand how things work.
Mike D has it.
Oxygen content of air: 20.9% (dry).
Oxygen content of N2O: 36.4%
Displacing a given quantity of 'air' with N2O increases the average oxygen percentage that the engine has available in the combustion chamber to react with fuel. Completely independent of head, cam, manifold, turbo, etc. Also has the nice side benefit of extracting heat energy from the aircharge when it exits the nozzle, expands and evaporates. We'll leave the temperature and density side of the equation alone for now, though.
We balance the race engine with turbocharger air (via wastegating / compressor / turbine sizing) and nitrous injection percentage to make as much power as possible at the air:fuel ratio we want (lean). Controlling that properly isn't easy - couldn't do it accurately enough with any of the available aftermarket controllers when we really started trying to get every last bit of fuel burned, and keeping it like that through staging, launching, etc. is difficult, to put it lightly.
The proto controller we built is basically the equivalent of a stand-alone, closed loop, wideband O2 controlled EFI system that solely runs the nitrous solenoids. Works really well with only a couple test outings on it so far.