Hello
I think my gvi is big enough, 130cm long, for tubes of 20/22 and 26/28, on the other hand it is quite far from the collector (it would be rather its weakness)
so two solutions are available to me, either find an average flow that suits all speeds or manage the arrival on the road with a solenoid valve
There are more than 2 solutions.
What is needed is to supply water according to the power requested, either the exhaust heat or the depression in the intake ect. When I walked with minicarburetor, the engine took the amount of water according to the engine suction .. but this had drawbacks at low revs. then injection with turbo air, this also has the disadvantage at low revs, but all these systems are partially self-regulating
What is important is to send water into the GV without the level starting to rise too high, if too much water accumulates it is because the GV is not able to treated more, pass a certain level, it is more able to take over, you will walk drowned.
You keep a bottom of water for low speeds 60kmh and you inject it in a measured way for walking in power regime
(Look at the photos above I have a manual button to inject water with a window washer pump, in addition to the automatic system, it is an experimental assembly so that I study the need for water at low speed, before doing an automatic control, you need to know the needs and what to base yourself to do the control.
Once properly adjusted the consumption at 60kmh or a100kmh is almost identical, before at 60kmh I consumed more diesel than at 110kmh ..
Andre