For those of us with progressive sprayers based only on boost, we have a minimum boost where the injection kicks in. The injection ramps up to full spray at a maximum boost. As long as you are above the maximum psi you are at a constant full spray. A typical setup (per the FAQ) is to have spray come on at 7 psi and reach full spray by 15 psi.
My question concerns the best min and max values for a setup. This was spurred by thinking of the compromises a simple progressive setup makes versus a more complex system that takes into account boost and airflow or rpm that would be ideal but cost more than my SMC kit.
My thought is to set the max value at the psi level your car tapers to at redline. So if your car tapers to 12 psi then set it there. My reasoning for this is that we most likely want full spray at the highest RPM because this is likely to have the highest intake temp.
For the minimum value my thought is to set it very low to give you low end punch and spool the turbo (I’m thinking 3 or 4 psi). This will also give you the most gradual ramping up rather than a sudden jolt. Also, if the controller ramps up in a linear manner, the lower you set the minimum value, the more injection you will be spraying at any point (given a fixed max value). Of course you will also be spending more money on injection juice.
I am very open to criticisms, as these are just my thoughts, and I am willing to change my views based on rational discussion.