What is the stock fuel pressure for the FPR of a JDM B16a and a JDM Type R B18c?

Cheers

 

Should be 38psi static on both motors.

 

Pressures are with vacuum hose off fpr.

b16 35-41 psi
b18c5 48-54 psi

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eda6 &raquo;</TD></TR><TR><TD CLASS="quote">Pressures are with vacuum hose off fpr.

b16 35-41 psi
b18c5 48-54 psi

</TD></TR></TABLE>

They do not fluctuate that much.

 

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

They do not fluctuate that much.

</TD></TR></TABLE>
different cars vary, so yes the do.

 

Explain. All B series stock FPR's have the same size diaphram. The only variable would be fuel pump flow and cleanliness of fuel filter.

But all b-series stock FPR's assuming the same fuel pump and brand new fuel filter would show 38psi at idle and 43 psi WOT.

If you can show me something different please do so I can learn. But I know this to be the truth. Maybe I am wrong.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by asubennett &raquo;</TD></TR><TR><TD CLASS="quote">
But all b-series stock FPR's assuming the same fuel pump and brand new fuel filter would show 38psi at idle and 43 psi WOT. </TD></TR></TABLE>

I always though it was 42 psi WOT?

Phil

 

All b-series fpr's are not the same, i know this for a fact.
1st gen b16's have an odd pressure compared to other b-series.

1st gen b16= 36-37 psi
as far as b18c= 47.6-54.7

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mmuller &raquo;</TD></TR><TR><TD CLASS="quote">All b-series fpr's are not the same, i know this for a fact.
1st gen b16's have an odd pressure compared to other b-series.

1st gen b16= 36-37 psi
as far as b18c= 47.6-54.7
</TD></TR></TABLE>

Where is your "fact" coming from. If you know something I don't please show me where you found it so I can learn.

I have cut off the tops of a lot of OEM B-series FPR's and they are all the same. Again teh varying pressure could be from fuel pumps, cleanliness of filter, and varying amounts of engine vaccum.

In fact, just for the fun of it. I had a FPR from a USDM type R and a FPR from a 1st gen B16 in my garage and last night I replaced them both onto my motor. The type R showed 44psi with the hose off and 38 installed. The B16 showed 43 psi hose off and 38 installed. The difference was negligble at best.

almost 55 psi from a stock FPR is crazy.

 

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

Where is your "fact" coming from. If you know something I don't please show me where you found it so I can learn.

I have cut off the tops of a lot of OEM B-series FPR's and they are all the same. Again teh varying pressure could be from fuel pumps, cleanliness of filter, and varying amounts of engine vaccum.

In fact, just for the fun of it. I had a FPR from a USDM type R and a FPR from a 1st gen B16 in my garage and last night I replaced them both onto my motor. The type R showed 44psi with the hose off and 38 installed. The B16 showed 43 psi hose off and 38 installed. The difference was negligble at best.

almost 55 psi from a stock FPR is crazy. </TD></TR></TABLE>


as you say i swapped a 1st gen fpr with a b18c one and there was a 3-4 psi difference between them. tried it with 2, 1st gen fpr's actually.
I agree that 55 psi is crazy, but thats what the HELMS say...
and you measure pressure with the vaccum hose off.

 

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


as you say i swapped a 1st gen fpr with a b18c one and there was a 3-4 psi difference between them. tried it with 2, 1st gen fpr's actually.
I agree that 55 psi is crazy, but thats what the HELMS say...
and you measure pressure with the vaccum hose off.</TD></TR></TABLE>

Where does it say that in the HELMS and what HELMS are you reading?

I know how to measure fuel pressure. Hose off simulates WOT.

 

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

Where does it say that in the HELMS and what HELMS are you reading?

I know how to measure fuel pressure. Hose off simulates WOT. </TD></TR></TABLE>

omg guy....

helms for 94 acura integra
helms for a 1st gen b16

no need to get defensive now buddy...
and part #'s for fpr for b18b, b18c1 and b18c5 are all different.

 

Whoa, I guess you can detect emotion from printed words??

All I did was ask a question. I am curious to know. What page numbers so I can double check against mine. Thanks-

No need to get all Oh my God when I am just asking questions. I will scan what is in my helms.

 

interesting... i did put a 92 LS FPR, on a 94 GSR, and they are all the same. my gauges @ WOT DOES read 42 psi tho. then again, fuel pump, and filter could be an issue.

 

With vacuum hose off:
1st Gen B16 - 35-41
B17A1 - 48-56
B18A1 - 41-48
B18B1 - 40-47
B18C1 - 47-54
B18C5 - 47-54

With vacuum hose on:
B18C1 - 38-46
B18C5 - 38-46

The 95 service manual states 31-36 for the B18B1, while the 98-01 states 36-43 with the hose on.

If you have any problems with these numbers, take them up with Helm, Inc.

 

Naturally you would think that the bigger displacement of the Type R B18c would mean that it has greater fuel requirements of say the B16a.

So do you guys think it would be a relatively cheap upgrade if I swap my B16a FPR for a Type R FPR. My mods on my B16a are just I/H/E, enlarged t/b, mild head porting, 2 layer HG and a VAFC which will get tuned shortly.

Cheers

 

Once again, the FPR's are the same. It is the fuel pump that is supplying higher pressures. Not the diaphram of the FPR.

 

&lt;Bill Lumberg&gt; Yeah, I'm going to have to go ahead and disagree with you there... &lt;/Bill Lumberg&gt;

The fuel pump merely pumps the fuel in a big circle, from the tank, to the fuel rail, through the regulator, and back to the tank. Without a restriction, the rail gets no pressure. Pumping more fuel will not affect the pressure in the rail, since the return line is larger than the feed line, and the fuel is perfectly happy to flow back to the tank. The purpose of the fuel pressure regulator is to restrict the flow of fuel back to the tank, causing a pressure buildup in the fuel rail. The reason for high volume fuel pumps is not necissarily to provide more pressure, but more volume to maintain the pressure when the injectors are busy relieving that pressure into the intake manifold. The fuel pump controlling the pressure would cause the adjustable fuel pressure regulators that replace the stock fuel pressure regulators to not work, which they do.

 

Switch your stock fuel pump to a Walrbo 255lph pump and tell me what happens to your fuel pressure.

If you have this fuel pump adn you have B&M Fuel pressure regualtor you can not even tone the pressure down enough to keep it form running to rich on a lightly modded motor.

You are right that an FPR limits and "regulates" hence it's name fuel pressure. But if the pump is flowing more volume of fuel than the regualtors diaphram was made to regulate fuel at a specific PSI, it will have higher pressure and vice versa.

 

You are correct, a massive fuel pump will make the pressure rise, but only because it overwhelms the stock fuel pressure regulator. A larger regulator would allow the pressure to return to stock, so if you can replace the fuel pump with a larger one and keep the fuel pressure unchanged, then the pump must not be responsible for the pressure. The stock regulator is made to restrict a certain percent of the flow, and with more flow, that means the percent it restricts it is larger, thus the pressure rises.

Look at it another way, if you put a smaller pump in, the regulator would have to restrict more fuel to make the desired pressure, but in the end you would get your 38psi or whatever, you would just be unable to use as much in the injectors before they took too much volume out of the rail and the pressure dropped.

 

hmmm. So do you believe the varrying Helms fuel pressure guidlines are from different FPR's or from different fuel pumps for every model.

I believe fuel pumps.

I say this only because of my expereince with what all b series OEM FPR's look like internally and how they behave on different cars.

I am going to mess around with these OEM FPR's today on my car some more and my sisters car. I have a walbro 190lph pump. She has an oem civic cx pump. And I will post the different pressures with pictures.

Your logic has me thinking both ways now.

 

I'm interested, let us know.

 

as drdisco sayd overwhelming the stock fpr is not a good example.
i have switched a non vtec(b18b) fuel pump for a vtec(b18c) fuel pump and pressure went up about a 1/1.5 psi.

Also, if all fuel pressure regulators are the same, then how come for example:
b17 fuel pump is rated at 208cc's and stock fuel press. is 48-56.
1st gen b16's pump comes at 230cc's and rated pressure is 36-37
b18c fuel pump is rated at 364cc's and stock fuel press. is 48-55.
then you have the non vtec's pump rated at 230cc's(222 for b18b, but..) and their rated fuel press. is 41-48(1 psi less for b18b).

 

We will have to wait and see I guess.

I am really questioning these Helms numbers 48-55 psi fuel pressure on a stock pump stock B18C FPR and B17 FPR apparently.

I have a USDM B18C5 FPR in my garage and a 1st gen b16 FPR I'll mount those on some different cars with different pumps to see what happens.

 

good chit let us know