Need help, Rising rate or just a mean looking regulator?

[Afshin]

The problem with the RRFPR remains that the ECU is never awar of its presence and hence can't adjust for it.

It will be difficult to tamper with a stock system to adjust appropriately, i.e. if you adjust the air flow meter to read less air then the car will run lean when the RRFPR is not increasing fuel pressure. if you are able to change your ecu parameters baced on variable conditions (boost,rpm, load...) then you don't need a RRFPR.

The RRFPR only responds to manifold pressure, hence it can't allow for optimal fuel enrichment based on RPM along with manifol pressure. So there will be a rich mixture under boost and lower RPM (max boost can easilly be reached by 3000 rpm and in a high gear such as 4th the time from 3000 rpm to 5000 or 6000 rpm for the next shift can be significant). The varying injector duty cycle at different RPM based on the ECU results in the overal increase in fuel delivery by the RRFPR to remain as a percentage increase of the ecu program as opposed to a fix amount of extra fuel delivery. This feature makes the RRFPR tolerable when used judiciously.

Also higher pressures running through the injectors are much more damaging than having a longer duty cycle(maxed out ECU) . Higher fuel pressures are clearly associated with injector failure. Additionaly low pressure is not a good way of leaning the mixture to compensate for larger injectors since it is associated with poor atomization of the fuel (poor spray) and hence inconsistent combustion.

In conclusion I believe that the RRFPR can be slightly beneficial if used conservatively and damaging if relied upon. Considering the cost of the units and questionable overall gain in the big picture I would look for better solutions