Cool. I just installed mine a few minutes ago. Do you have a fuel pressure gauge, and if so what kind and how is it mounted? Also how do I decrease the pressure? Do I loosen the lock nut and turn clockwise and make the bolt go down?

Thanks for the info,

-Daniel

 

i actualy borrwed a gauge from one of the techs at work.
just get any pressure gauge that can be used with liquids.
put in inbetween the fuel filter and the rail.
to increace pressure crank it in, back it out to lower.
its set at the stockish 36psi under vaccum and 44 without.
i run mine at 37.5ish, just a tad richer than it would be.

 

Everyone thought I was crazy when I came up with this idea, remember!

The Walbro fuel pump is so strong that it flows more fuel than the stock regulator can handle. Now I tell EVERYONE they need it. Hopefully this will help people to understand, its not the motor, its not Nissan's design, its just that damn upgraded pump!

 

So even at stock fuel press. the Nismo/Tomei FPR can still handle the flow? Is that the concensus?

 

How about somone trying to make 350+ WHP woudn't the extra fuel pressure help out by letting the injectors flow slightly more fuel? I have a PFC so I can turn the pulse down at idle to keep it from running too rich.

 

You can tune for higher pressure, but the stock maps are set for the 35PSI at idle, 43 with no vacuum. The Nismo regulator is adjustable enough to allow enough fuel to flow that you maintain the 35PSI at idle, but the stock regulator is NOT able to handle the extra flow.

 

Another point of consideration is when running high boost...

If you're running a Walbro 255hp without an AFPR, it can run as much as 55psi at idle.

The FPR adds 1psi of fuel for every 1psi of boost, then at 20psi, you've got 75psi of fuel pressure, which can be dangerous!

 

So do you need one with the sr with a walbro?

 

You probably should since the regulators are very similar

 

i would strongly reccomend it.
i think the problem ive been having with it running too lean up top (~13's afrs) is because the stock fpr cant handle the fuel flow and it just goes through the rail and past the injectors.
the car feels better throughout the rev band, smooth and not as bogged as it used to.
also it idles now and when i come to a stop it doesnt almost stall because of the fuel pressure.
i know when i had the gauge on it and revved the engine the fuel pressure went up like crazy.
the nismo one holds it at 37 at idle and 45 without vaccum with v. little adjustment.
i would say that if it nets me 4mpg more then it is well worth the 93$ i paid for it.
also if it solves the lean out problem i have then its 2 birds with one stone.

 

denzo fuel pump



hey what about the denzo fuel pump for the stock mark iv supra i heard it goes into our pump housing easily and it holds up to 600 hp anyone know anything about these?

 

SR FPR is good up to 350hp
The malpassi rising rate ones work pretty well on both RB and SR

 

Should I Get A Fpr Or Just Order The Microtech? Or Both?

 

They told me FPR even with Power FC, so I would say yes to that.

 

Yeah, adjustable FPR is good no matter what.

 

Yeah.... I Was Just Making Sure. Some Kid Interested In My Car Was Asking About It And I Told Him To Just Get The Fpr And Tune It But He Said He Wants A Standalone No Matter What.

 

I know this is the RB forum, but I have a KA24DE turbo that runs rich, particularly in lower RPM and idle... does the Nismo FPR work with the KA fuel rail? I know the SR20DET and KA24DE rails are the same. Is that the FPR you guys are buying for your RB's?

Nismo FPR

 

HERE GET THIS ONE: http://www.performancenissanparts.com/catalog/product_info.php?cPath=146_560_577_581&products_id=96

 

The KA/RB/SR regulators all are alike

 

HERE GET THIS ONE: http://www.performancenissanparts.com/catalog/product_info.php?cPath=146_560_577_581&products_id=96

Wow that's cheaper. You have to shop around I guess. THANKS :thumbsup

 

what about the FPR you find on ebay such as OBX or Weapon R they say they are adjustable from 0-100psi and they come with the gauge, are these worth it or are they a waste of money?

 

Havent tried them, but a buddy bought one....I will let you know what he thinks

 

what about the FPR you find on ebay such as OBX or Weapon R they say they are adjustable from 0-100psi and they come with the gauge, are these worth it or are they a waste of money?

I have one of the Weapon R ones in my garage that a friend got me a loooong time ago, if anyone knows how to get them to fit, tell me plz

 

i would strongly reccomend it.
i think the problem ive been having with it running too lean up top (~13's afrs) is because the stock fpr cant handle the fuel flow and it just goes through the rail and past the injectors.
the car feels better throughout the rev band, smooth and not as bogged as it used to.
also it idles now and when i come to a stop it doesnt almost stall because of the fuel pressure.
i know when i had the gauge on it and revved the engine the fuel pressure went up like crazy.
the nismo one holds it at 37 at idle and 45 without vaccum with v. little adjustment.
i would say that if it nets me 4mpg more then it is well worth the 93$ i paid for it.
also if it solves the lean out problem i have then its 2 birds with one stone.

On my R33 clip there is a second slightly larger FPR mounted inline on the shock tower for the return line.
I'm debating whether to transfer it- those Nissan engineers installed it for some reason.

 

I'm wondering the same thing as boardman. I already put it in my 240, but what exactly is it?

 

ah.
that is really a damper for the fuel line.
the rb20 has one too but it is actualy on the fuel rail.
its supposed to minimize fuel pulsations in the rail, so you can either keep it to ditch it, completely up to you.