Mr guitar
In pondering your question I believe you should know that "our" Supercharged engines are equipped with 100cc injectors that are producing/flowing 66% more volume than the Normal Aspirated version of the same displacement engine.
I have often noticed strong unburned fuel vapors while under boost when in low RPM ranges when operating on the streets for decades.
I am not sure, nor can I prove it, but I speculate that the o2 sensor input may be limited by OEM computer mapping when the system is under boost and/or WOT conditions or perimeters.
I have no input whatsoever on the piggyback PNP systems, but I might suggest to you that the larger SC injectors and possibly the SC ECU be used in your future pressurized "Silvertop" adventures.
It should be remembered that extra unburnt fuel adds to the cooling of the piston and is not neccessarily a bad thing.
Supercharzed Toyz
A Toyota Race Team since 1989
