Is an FMU and FPR the same thing? I hear people talking about FMU's raising fuel pressure but I thought that was the job of the FPR??

 

A fuel pressure regulator or FPR helps maintain a constant fuel pressure. A Fuel Management Unit or FMU is a rising rate reguator that boost fuel pressure in conjunction with manifold pressure. You typically run an FMU with a 1:1, 8:1 or 12:1 disc.

 

which is used more commonly? Can you use them both at the same time?

 

I have the same question, I have a vortech 12:1 fmu, with a stock fpr, what should I do, and will the fmu do anything while the stock fpr is there?
BTW: I have a b18b1 teg ls and im running 6.5 lbs of boost.
Tia

 

ya someone please help us here...although I will be using Hondata instead of the fmu and fpr

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xstalkrx &raquo;</TD></TR><TR><TD CLASS="quote">which is used more commonly? Can you use them both at the same time?</TD></TR></TABLE>

They both do something completely different.

The FMU is a boost dependant fuel regulator, meaning it raises the fuel pressure a certain number of psi for ever lb of boost. It is not adjustable, aside from changing out the discs.

So with a 12:1 disc in your FMU, and you're running 6.5 lbs of boost. Then it will raise your fuel pressure 78 psi!

An FPR is not boost dependant. It will maintain a constant amount of fuel, regardless of how much boost you are running. An adjustable FPR will let you manually change your "idle" fuel pressure.

You can run both at the same time, because each does something different.

If you are not running any other form of fuel management then you will need to have an FMU.

 

it would be nice to have both if your going to go that route. the fmu will raise the fpr from what you have it set on the fpr