Why do things like this keep me awake at night.
With the second nozzle pre supercharger you are cooling the air charge pre supercharger and not pre throttle body so the volume of air cooled theoretically will shrink pre supercharger and assist in drawing more air through the throttle body?
Then with the extra air post supercharger the heat soak and compression heating this air would expand to a greater volume and so increase boost.
The extra water / meth the change from a liquid to a gas through heating will also create more pressure ie increase boost.
I think you will have to look at the afr's to check out the theory in practice. Higher boost with second nozzle running leaner would indicate there is more air through the system. Unchanged AFR's at higher boost would indicate the water steam theory is more correct.
Anyway it's all good fun boosting engines.
Now where did I put my piece of string.
With the second nozzle pre supercharger you are cooling the air charge pre supercharger and not pre throttle body so the volume of air cooled theoretically will shrink pre supercharger and assist in drawing more air through the throttle body?
Then with the extra air post supercharger the heat soak and compression heating this air would expand to a greater volume and so increase boost.
The extra water / meth the change from a liquid to a gas through heating will also create more pressure ie increase boost.
I think you will have to look at the afr's to check out the theory in practice. Higher boost with second nozzle running leaner would indicate there is more air through the system. Unchanged AFR's at higher boost would indicate the water steam theory is more correct.
Anyway it's all good fun boosting engines.
Now where did I put my piece of string.