Jump to content
SAU Community

Recommended Posts

I've picked up a Nismo FPR, in an attempt to squeeze another 10% or so out of my rb20 injectors, and hopefully pull around 200-210rwkw with my highflow.

Just wondering if there is anyway to adjust it .. without having a proper fuel pressure gauge?? I thought there might have been some markings on there, but doesn't appear to be anything like that unfortunately :D

If not, I guess I will leave it to the tuner to do. Its a 5 minute job.. I am just worried I could get charged $50 for labour to fit it!

Link to comment
https://www.sau.com.au/forums/topic/91376-adjusting-nismo-fpr/
Share on other sites

I got one of these fitted to my car 2 months ago, and was charged something close to fiddy bucks for labor (good thing I had some other things fitted at the same time!) I thought it was something best left for a tuner to do. As far as I could tell, to adjust it you need to turn the nut on the end? No way you could safely do it with out some sort of gauge though.

"My cat's breath smells like cat food."

So if I bought a FPR with a gauge on it... adjustment would be a piece of cake? Provided you knew what you were doing of course...

What's the difference between a normal FPR and a Rising Rate FPR? What is the optimal setting of this thing?

if you are going for more power than the stock injectors require my advice is to just get bigger injectors. the problem with upping the fuel pressure is that you can cause problems with the spray pattern and in extreme cases cause the injectors to leak. another very common one is that with the extra pressure you can find some leaks will surface in your fuel system.

for example say stock pressure is 38psi with only atmospheric pressure. and stock boost is 7psi that's 45 psi total

now you want to run 4 psi more more pressure. this is 42 psi. and of course with the new turbo you are running 18psi. you now have 60psi at full boost. the difference between 45psi and 60psi is 15psi... that is a lot and i would think is more than the stock system is designed to handle.

OK Mr Beer Baron - thanks for you help.

I'm hoping to chase at least 250rwkw and if possible, 300... perhaps you could PM me a list of parts that would get me to that mark? Also, tell me what the best turbo would be for my application :)

well i'm by far an expert on anything (especially RB25s!) but if i were doing it i'd have (for 300rwkw):

600cc injectors

Power FC

some form of boost controller (personaly, greddy profec B II)

FMIC

upgraded panel filter, or pod

larger exhaust from turbo to tip (3inch should do it)

Oil cooler

decent clutch

as for turbo i'm not to sure what the gun combo is on an RB25 but i think an HKS 2835 kit could be pretty close to the money.

Now just to keep this on topic. Predator, you'll need two things to adjust the reg.

1. workshop manual (to find out what pressure it should run as stock base pressure)

2. Fuel pressure gauge.

other than that a 10mm spanner is the only too required to set it. but just heed my warning about upping base pressure, and upping boost.

Thanks BB, since I drive an Auto does this mean I can scrap the clutch and the power fc?

Could you take a look at my site and tell me what else is needed? I really appreciate your help :(

Now I'm going to stop invading predator's topic :(

Think I'll leave it to the tuner if there is no easy way.. to buy a gauge will cost more than $50 for them to fit and fiddle with it :(

in my case, the rb20 is coming out in about 3 months, so no point stuffing with injectors or aftermarket ECU.. I just want to try and crack a low 13 on the cheap before the engine comes out..

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • This. A 3d wheel alignment is like $120...just take it to the shop. Since theres probably multiple adjustments that need to be made after changing something. Mine has front/rear lower arms, traction rods, tension rods, camber arms, toe arms, front upper arms, hicas kit, sway bars and coilovers. I measure from the edge of the bolt holes on the originals and set the same length on all the adjustable stuff to dial it as close as I could to OEM. Took it straight for alignment; it didnt feel right at all...after alignment, it feels perfect. Similarly i've just changed the springs on another car; and I still needed multiple adjustments to bring it back in spec.
    • A full Veilside kitted JZA80 Supra in Meriken park in Kobe city a few weeks back
    • Its a well known brand in New Zealand; its a rebrand of the Rhino RAV3.  I don't know what the wiring difference *is* between the rev.1 (installed about 15 years ago) and rev.2; but as you say I would think its reasonable that it uses the same immobiliser relay circuits. I had a look but couldnt see a similar harness; but didnt move things around since I didnt want to mess with it   It was one of AVS well known Authorised Installers; I spoke to AVS themselves about it but theyre unsure hence seeking advice more so from the skyline community who are more familiar with the actual car and its wiring. Im in Auckland; but the installer is on the other side of the city so hes very reluctant to come back to even look at it to confirm something isnt connected into the wrong wire.  I dont want to drop the name since they *did* do a really good job for the most part. Everything is very tidy and he fully replaced all the alarm wiring, all the sensors, the wiring to the door motors, installed a switch which was never installed in the first place...really happy with the alarm install itself..just not this one issue. We all make mistakes, if it is the alarm, I just want my fuel pump getting proper switched, fused, power as it was; without having to shell out for an auto electrician to switch a wire and tell me it was the alarm. 
    • Even with the piston at TDC there was room for it to drop, but I don't think it can drop fully into the cylinder, the problem you have is that you need something pushing against the valve to hold it up so you have enough room to put the new stem seal on and the spring etc.  I used compressed air only because putting rope in the cylinder seemed a bit risky to me, I know people have done it countless times before like this. Overall it's a pain in the ass job. Honestly you'd probably be better off taking the head off because the risk of dropping something in the engine and the finicky-ness of it all is very stressful. If you are going to attempt it though i 10000% recommend a 36050 valve spring/keeper tool. I had both the traditional lever type and after doing 1 cylinder it was absolute pain to get those valve keepers in place, even with 2 people. That 36050 is amazing, you do have to push hard to get them in place but it works perfectly almost every time. Back to my actual issue I think my engine is just tired and old and the rings have gone bad. The comp numbers (cold, no oil) were: Cyl 1 -129psi Cyl 2 - 133psi Cyl 3 - 138psi Cyl 4 - 137psi Cyl 5 - 157psi Cyl 6 - 142psi   Cylinder 5 and 6 having the most carbon on them.
    • Who did you have do the installation? I actually know someone who is VERY familiar with the AVS gear. The main point of contact though would be your installer.   Where are you based in NZ?
×
×
  • Create New...