hey guys quick question on the EBL utility lets say 61lb injectors at 25 psi gives you a BPC value of 108. If you click the Vacuum reference tab it changes based on engine vacuum obviously. My question is when running vacuum reference 0 KPA is still 108 BPC but 80KPA is now 147 BPC is The KPA reading in the table opposite of your KPA reading in the WUD? does 80KPA on the bpc table mean 20 KPA (high engine vacuum) on the WUD like at idle. and 0 KPA on the BPC Table mean 100 KPA (Low engine vacuum) on the WUD like durring WOT?

 

With a VRFPR the higher the manifold vacuum the lower the fuel pressure.

The lower the fuel pressure the higher the BPC value needs to be to supply the engine with enough (proper mass) of fuel.

 

The MAP value shown on the WUD is manifold pressure. At sea level with standard air it is about 104 KPa.

Manifold vacuum is the opposite. The ECM calculates it by subtracting the current MAP reading from the barometric pressure. So if baro is 104 KPa and the manifold pressure is 70 KPa, then the vacuum is: 104 - 70 = 34 KPa

RBob.

 

Thanks Rbob for clarifying that for me 👍