I have the AEM fuel press regulator where you can only adjust a fixed fuel press and no boost depending fuel press. I use the Walbro fuel pump from Jackson Racing and 440cc RC injectors.

At Idle I have 3 Bar (43.5 psi) fuel press and at WOT above 5000rpm it jumps up to 4.5 Bar (65.25psi). Why is this so? Should´nt I have always the same press, or at least near the same when idle and at WOT with the AEM fuel press regulator?

 

if your asking if the fuel pressure is supposed to go up when you are wot, yes it is... otherwise i dont understand yer question

 

the aem fpr raises fuel pressure 1psi per lb of boost. it always keeps the same difference between intake pressure to fuel pressure


[Modified by racerxadam, 12:34 AM 4/29/2002]

 

realy?! I thought it will not rise the fuel press when boosting. I always thought it is just an fuel press regulator for an fix fuel press.

What is Hondas (Integra type-R) factory fuel press for idle and WOT.

 

The fuel pressure will always be baseline + manifold pressure (your boost level).

To keep fuel delivery constant, fuel injected cars have fuel pressure regulators that keep the pressure DIFFERENTIAL between the intake manifold and the fuel rail constant. If you are under 20psi of boost, then fuel in the rail is, in essence, being "restricted" by the boost pressure in the manifold. The fuel regulator will then add 20psi of fuel pressure (your boost level) to keep fuel pressure (and then delivery) constant for all load/boost levels.

Dustin

 

Oh I understand. When in the combustion camber is boost it will press against the injected fuel. So it is a MUST to increse the fuel press when the press in the cylinder is higher to get the same amount of fuel into it, right.

So it is a common fuel press setting I have?

Thanks