Tom,

My engineering skills are nowhere near as advanced as Woody's, but let me see if I can decipher into a 'for dummies' version, as you put it.




So here we have a small graph... The Y-axis is the Air/Fuel Ratio (A/F) and the X-Axis is Boost. Now the bottom left corner of the graph is "0" and the values increase as you move outwards along both axes (NOTE: sorry about the green dot, should be on the y-axis representing 0psig boost)

Moving on. The black line is the current results of the a/f ratio as boost is increased towards woody's 20psig. As boost increases the a/f ratio decreases because the fuel delivered to the engine is basically the same (non-linear increase in relation to boost across the entire spectrum) at all times. This is not necessarily good as when higher boost is reached there is not enough fuel in the engine for proper combustion.

The red line represents Woody's current situation (correct me if I'm wrong Woody). With the addition of his FPR (fuel pressure regulator) he has helped to increase the A/F ratio average across all boost. Now as Woody stated he still sees a lower A/F ratio at full boost then he would like to see. So this is the cause for the drop off at full boost (however, the actual A/F loss may come at some other point in the boost curve)

The blue line is the ideal A/F ratio across the entire boost curve...This is what he Woody is ultimately striving for to maintain peak engine performance and fuel delivery at all times....

Looking back that may not have been 'for dummies' enough....




Basically, you want an A/F ratio with little variation at all amounts of boost. This is what woody is working for.