Does anyone know what the "sweet spot" is for gaining the best foam when it comes to looking at pressure washers and their PSI and GPM ratings? And just to be clear, I'm not referring to their advertised PSI, since those seem to be heavily inflated in most cases, but when testing with a gauge in the real world with something like a 15-degree tip? Also, this is taking into account you are using a high-end foam cannon with an optimal orifice.
What I don't understand is what happens in relation to the resulting foam as PSI increases or decreases and everything else remains constant. The same holds true for GPM. Do you always want more GPM? I wouldn't think so and in some cases I might think that the less GPM, the better, because the more GPM you have might cause the foam to become more diluted as it reaches the car. Personally, I would want the foam to have a little "dwell time" before it starts to run. Does that make sense? If anyone can shed some light on this it would be appreciated.
What I don't understand is what happens in relation to the resulting foam as PSI increases or decreases and everything else remains constant. The same holds true for GPM. Do you always want more GPM? I wouldn't think so and in some cases I might think that the less GPM, the better, because the more GPM you have might cause the foam to become more diluted as it reaches the car. Personally, I would want the foam to have a little "dwell time" before it starts to run. Does that make sense? If anyone can shed some light on this it would be appreciated.