I have been working on my Theoretical fueling tables and I was wondering how the fuel pressure is affected under boost? In the ideal world, we would see it increase pound for pound. I believe that our cars run 55-60PSI at atmospheric pressure and I have no idea what happens under boost.

 

Depends on your fuel pressure regulator.

 

Sorry, I am using the Stock Regulator now.

 

The stock regulator is a 1:1 regulator, which means there is 1 PSI increase in fuel pressure per 1 PSI of boost.

Rising rate regulators (FMU) vary, you can get different calibrations such as 6:1, 10:1 and 12:1. which for every 1 PSI of boost on a 12:1 rising rate regulator will net 12 PSI increase in fuel pressure.

So in a sense, the stock fuel pressure regulator is a rising rate regulator, just not as dramatic as an FMU, as it is only calibrated for 1:1.

 

Great, that is what I was assuming however, you know what they say about assumptions.