J2turbo21

I did a search and this is what I got.

From what I read the proper way to adjust the FPR is to pull the vac line off and plug it,then adjust the FPR.Doing this is the fuel pressure you get at WOT.Or you can adjust the FPR while the car is off according to the hondata website.

Here is a quote that I got from HT:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">When you read it with the hose on you are reading the regulated pressure. You set the pressure for WOT under load since that is when you are gonna need the fuel. Since getting the car to WOT and under load in your garage is difficult to do the easiest way is to pull and cap the vacuum line. This is basically what the car does when you floor it. By shutting off/removing the vacuum you open the regulator up all the way. This is where you set your pressure.</TD></TR></TABLE>

Here is what I got from Hondata:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">The fuel pressure should be measured and adjusted without the engine running. If the engine is running then the manifold vacuum will cause the fuel pressure regulator to lower the fuel pressure. Since manifold vacuum is dependent on idle speed and cam timing, this is not an accurate and repeatable way to measure or set fuel pressure.

To measure or set fuel pressure switch the ignition key to on but don't start the engine. The fuel pump should prime the fuel system. You may need to flip the ignition key between off and on repeatedly.

During a dyno run under full load check that the fuel pressure is correct. For naturally asteriated cars the fuel pressure under load should be the same as the static fuel pressure. For forced induction cars the fuel pressure should be the static pressure plus the manifold pressure.</TD></TR></TABLE>

Let me if this is the correct way to adjust it.Also what is Static fuel pressure,is that when the vac line is pulled?

J2turbo21

Anyone?

smokey2.0

damm, i got to try that. i thought it was only done with the engine on, removing the vacum line and adjusting the pressure. but i have alwasys noticed, that when you prime the pump the gauge shows a oressure reading! i'll try to adjust it with the engine off, and see if it makes a difference!

smokey2.0

J2turbo21: last night i adjusted my fpr to 50psi using the hondata method, when i turned the car on this morning i noticed that the gauge was reading 60psi and not 50 or &lt; like i thought it would. i quickly pulled the vaccum line, and adjusted it back to 50. did this happenned to you, when you used the hondata method?

J2turbo21

Actually i havent tried either method hehe I posted this to see if others agree so i can try it.My car isnt running and i was gonna try it on my friends crx.

When you adjusted it like hondata said did you start it up after or not until the next day?

smokey2.0

i started it the next day, maybe next time i'll do it all in sequence!

J2turbo21

Try it both ways i listed and see what happens.Also if you try it the hondata way see what happens when you start the car up right after.

smokey2.0

i'll try both ways when i get some time, i'll keep you posted!

ionic_slim

So what is the correct way??

filtereds0ul

do you cap the vacuum line from the manifold or from the regulator?

W O T

bumo for some good questions that need answerring

drdisco69

It's not hard. You want to meausure the pressure with respect to atmospheric pressure, so you must disconnect the vacuum line and plug the manifold side to keep the idle steady. Adjust the fuel pressure with the engine running, so the fuel pump keeps running and keeps the system at a constant pressure. Put the vacuum line back on and close the hood.