I just installed my B&M fuel pressure regulator and gauge. Now I just need some help on where to set my fuel pressure. I only have the basic mods done for now. What I have is a DOHC ZC with bored throttle body, port matched intake/exhaust ports, intake, header, exhaust, pulley. Any help would be great, thanks
-Adam

 

bump

 

I did a little searching around and it seems ideal is anywhere between 38-42.

 

Why do people remove the stock fpr and install a new one w/o checking fuel pressure?

Put the old regulator back on and see what fuel pressure is. I'd add a 1-2 psi with those mods.

 

^^Well thats what I did. I added about 2psi. I was just wondering if someone had some sort of equasion or something.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91civichatch2571 &raquo;</TD></TR><TR><TD CLASS="quote">^^Well thats what I did. I added about 2psi. I was just wondering if someone had some sort of equasion or something.</TD></TR></TABLE>

Best way to check is with a wideband o2 sensor..

 

Maybe a little off-topic:

It is my understanding that dropping fuel pressure will lean out the entire band and visa-versa...is this correct?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">

Best way to check is with a wideband o2 sensor..</TD></TR></TABLE>
Its on the way, so we'll see. Thanks for the help

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spankjelly &raquo;</TD></TR><TR><TD CLASS="quote">Maybe a little off-topic:

It is my understanding that dropping fuel pressure will lean out the entire band and visa-versa...is this correct?</TD></TR></TABLE>

Sometimes.. If your air/fuel mixture is correct and you put a intake on your car, then where ever the intake becomes efficent and flows more air then that rpm area is going to be leaner than the rest..

Your really talking about minor offsets in air/fuel ratio anyway but what I would do is tune the fpr to give you your good air/fuel ratio in the rpm band that you going to be using for racing.. Meaning that if you hover between 6K-8K then tune that area for the most power and your done.. Best way to do this is get it on a dyno and move the fuel pressure around and keep checking torque made in that rpm band and find what setting gives you the most power there..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tgreaves &raquo;</TD></TR><TR><TD CLASS="quote">

Sometimes.. If your air/fuel mixture is correct and you put a intake on your car, then where ever the intake becomes efficent and flows more air then that rpm area is going to be leaner than the rest..

Your really talking about minor offsets in air/fuel ratio anyway but what I would do is tune the fpr to give you your good air/fuel ratio in the rpm band that you going to be using for racing.. Meaning that if you hover between 6K-8K then tune that area for the most power and your done.. Best way to do this is get it on a dyno and move the fuel pressure around and keep checking torque made in that rpm band and find what setting gives you the most power there..</TD></TR></TABLE>

Good info...thanks man