Fuel Pressure gauge options

Post by **chixwithtrix** » Mon Oct 27, 2008 7:45 am

I have a Nismo FPR and Tomei 740cc injectors on my RB25 and just finishing up the swap. I don't have a fuel pressure gauge and wanted to know which one to get and how to figure out where to set the pressure at. Just looking to get a mechanical to put on the line; I saw the link to the one on Summit Racing in another thread, but it only goes up to 15psi...? Thanks in advance

Post by **Darius** » Mon Oct 27, 2008 8:04 am

The 15 psi gauge is for carburated engines. The RB25 obviously requires a higher range >75 psi for accuracy. If you want the gauge in the car, any electronic gauge will do but you get what you pay for.

As for setting the fuel pressure, that all depends on your fueling system. If the fuel pump is up to task but the injectors are small, then increasing the fuel pressure to get a higher volume thru the injectors will be a cheap trick. Vice versa and it is simply limited by the fuel pump.

If the injectors are sized for the pump, then running the stock base fuel pressure is fine and an adjustable fuel pressure regulator is unnecessary.

Post by **chixwithtrix** » Mon Oct 27, 2008 8:12 am

Not to be facetious as I appreciate your quick reply, but you did not really answer my questions. I already have a FPR and larger injectors, plus a Walbro fuel pump.

I know 15psi is for carbed engines, that why I was asking why someone recommended it for an RB in another thread, I thought maybe I was missing something? I do not think I want a gauge in the cabin, I just want to know the pressure that my regulator is set at and a mechanical one in front of my FPR should be fine. If it doesn't matter then I will not get a gauge, but from the other threads I've seen you need to set the pressure to make sure the system is running best?

Will this gauge work? http://cgi.ebay.com/ebaymotors...68047 along with this fitting: http://store.summitracing.com/...w=sku
Modified by chixwithtrix at 11:23 AM 10/27/2008

Post by **ANVIL** » Mon Oct 27, 2008 8:28 am

i have that fitting, along with this gauge from summit:

http://store.summitracing.com/...w=sku

simple install, does the job, small and clean looking. also cheap

Post by **chixwithtrix** » Mon Oct 27, 2008 8:58 am

ANVIL wrote:i have that fitting, along with this gauge from summit:

http://store.summitracing.com/...w=sku

simple install, does the job, small and clean looking. also cheap

excellent, just ordered it!

Post by **Darius** » Mon Oct 27, 2008 9:12 am

chixwithtrix wrote:Not to be facetious as I appreciate your quick reply, but you did not really answer my questions. I already have a FPR and larger injectors, plus a Walbro fuel pump.

I know 15psi is for carbed engines, that why I was asking why someone recommended it for an RB in another thread, I thought maybe I was missing something? I do not think I want a gauge in the cabin, I just want to know the pressure that my regulator is set at and a mechanical one in front of my FPR should be fine. If it doesn't matter then I will not get a gauge, but from the other threads I've seen you need to set the pressure to make sure the system is running best?

What I was getting at since I didn't know the fuel pump was that you should sell the FPR because it is unnecessary unless, of course, the stocker went bad and you're simply replacing it. Put that money towards the gauge and fitting you have listed above. Those will work fine, but I'm curious to see if the gauge's male fitting clears the housing enough to allow the fitting to screw onto it without interfering. Might need to add another 1/8"NPT adapter fitting. I know I had to do this for my SARD FPR (that I haven't installed yet because I don't have the need yet )

Post by **johnny butt** » Tue Oct 28, 2008 2:44 pm

chixwithtrix wrote:
excellent, just ordered it!

hey, so you should totally do a write up on how to install the gauge and set the pressure with the FPR.

There's one for the SR20 already, and it can't be too much different, but not for the RB25.

Not to mention it would probably be a pretty simple article.

(btw, this is my next step, so if you don't do it, I probably will if I can get around to it.)

Post by **Sil240** » Wed Oct 29, 2008 4:19 am

Well also if you have bigger injectors, Fuel pump and ecu.And of course more Air going in, then you can use the FPR for better atomization.

Post by **chixwithtrix** » Wed Oct 29, 2008 8:03 am

the engine is pushing 400hp and I'm about to get it tuned for race gas so I figured I'd need some kind of gauge. I don't like not knowing what my engine is doing

Post by **Yellow4g63** » Wed Oct 29, 2008 10:04 am

I have that summit gauge on my regulator. Liquid filled ftw.

Post by **mello88** » Wed Oct 29, 2008 12:07 pm

You'll be good with that setup. I have something almost identical, but from Jegs. Works great.

FYI set rail psi to 43.5 aka 3 bar at idle with the vac hose to FPR disconnected.

Post by **chixwithtrix** » Wed Oct 29, 2008 12:16 pm

thanks for the info on the pressure

Post by **johnny butt** » Wed Oct 29, 2008 12:43 pm

dumb question, but would the gauge go in-line here..?

pic:

better pic....:

Post by **ANVIL** » Wed Oct 29, 2008 1:03 pm

cant see any of the pics from work but i can tell u it goes inline immidately after the fuel filter

Post by **johnny butt** » Wed Oct 29, 2008 2:49 pm

ANVIL wrote:cant see any of the pics from work but i can tell u it goes inline immidately after the fuel filter

Alright, that makes more sense.Also, I noticed I don't have clamps on either side of the lines that are on the FPR. Should that be something I should be worried about? (i.e...go and get some hoseclamps and put them on when I am changing things out anyway?)

Post by **ANVIL** » Wed Oct 29, 2008 2:53 pm

johnny butt wrote:
Alright, that makes more sense.Also, I noticed I don't have clamps on either side of the lines that are on the FPR. Should that be something I should be worried about? (i.e...go and get some hoseclamps and put them on when I am changing things out anyway?)

i would. might as well. whats like 1$ more in parts and a minute more of your time, to make sure your fuel lines stay on?

Post by **johnny butt** » Wed Oct 29, 2008 3:10 pm

ANVIL wrote:
i would. might as well. whats like 1$ more in parts and a minute more of your time, to make sure your fuel lines stay on?

yeah that's what I was thinking, don't know why they aren't there already...

Post by **johnny butt** » Thu Oct 30, 2008 10:21 am

OK, here are the lines on top of my fuel filter.

I am guessing the one on top coming directly out of the tube into the fuel line is the one I am going to put the gauge on?

Two angles...

Post by **mello88** » Thu Oct 30, 2008 12:48 pm

Yeah that's it, splice it into the line coming from the filter to the rail.
Modified by mello88 at 4:03 PM 10/30/2008

Post by **chixwithtrix** » Thu Oct 30, 2008 1:43 pm

man, theres a lot more room down there w/o the Greddy intake :sniff

Post by **ANVIL** » Thu Oct 30, 2008 1:53 pm

chixwithtrix wrote:man, theres a lot more room down there w/o the Greddy intake :sniff

want to trade?

Post by **chixwithtrix** » Thu Oct 30, 2008 2:07 pm

lolz

I just need to figure out how to get the damn wiring and relay box out of the way. Looks so dirty now

Post by **chixwithtrix** » Wed Dec 03, 2008 4:37 am

Got the gauge installed and the pressure is around 20psi it idle right now

Just to make sure - to increase the fuel pressure at the reg I have the engine running at idle, pull the vac hose to fpr and bring the pressure to 43.5psi, then return the vac hose and thats it? Thanks for all the help

Post by **wawazat8402** » Wed Dec 03, 2008 8:59 am

Thats correct.

Fuel Pressure gauge options

Fuel Pressure gauge options

Re: Fuel Pressure gauge options (chixwithtrix)

Re: Fuel Pressure gauge options (Darius)

Re: (ANVIL)

Re: Fuel Pressure gauge options (chixwithtrix)

Re: (chixwithtrix)

Re: (Sil240)

Re: (chixwithtrix)

Re: (mello88)

Re: (chixwithtrix)

Re: (ANVIL)

Re: (johnny butt)

Re: (ANVIL)

Re: (johnny butt)

Re: (mello88)

Re: (chixwithtrix)

Re: (ANVIL)

Re: (chixwithtrix)

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