Jump to content
SAU Community

At Wat Power Level Do U Start Running Into Problems With The Standard Rb26 Fuel Rail


Recommended Posts

i had my car on the dyno for a tune yesterday and when we got to 400kw it started running into problems with fuel

we had a fuel pressure + flow gauge connect to the car while we were tuning the flow doesnt drop at all but the fuel pressure goes from 40psi to 60psi and then just drops back down to 40 instead of going higher it just drops back to 40 and the car leans out so we neva got to finish the tuning

fuel system is pretty basic

bosch 023 (rated at 700hp) mounted intake

SARD 800cc injectors

HKS fuel reg

well pressure dropping is usually an indictor of pump running out of puff, or faulty fuel regulator, not restrictive fuel rail. are you sure the fuel flow wasn't affected at all by pressure change? where were you measuring the flow, and how?

dirty fuel filter?

its got a brand new fuel filter already on it

well pressure dropping is usually an indictor of pump running out of puff, or faulty fuel regulator, not restrictive fuel rail. are you sure the fuel flow wasn't affected at all by pressure change? where were you measuring the flow, and how?

it cant be a fuel reg because at 1st we thought it was a faulty fuel reg and replaced my SARD fuel reg with a HKS one and it changed nothing

the fuel gauge we have is the blue one

the gauge is used to measure fuel pressure the it has a ball which moves up and down to show u how much fuel flow u have

isnt the 023 rated less then a 044?

could be upgrade time

the 044 is rated at 600hp

the 023 is rated at 700hp

if you are running stock wiring to your fuel pump then that will be part of your issue kemp

we have already wired the fuel pump so it gets full voltage

are you sure the 023 is rated higher than a 044? From what info i could find the 023 is rated at 163L/H @ 5bar vs. the 044 rated at 200L/H @ 5bar.

The HP ratings on pumps vary by 300hp depending on where you buy them, the L/H don't.

Who has actually found the limits of the stock fuel rail?

I know its not the answer to your question but i had just on 400 KW at the treads on a stock rail and Nismo regulator.

I know its not the answer to your question but i had just on 400 KW at the treads on a stock rail and Nismo regulator.

Cool thanks

Would be good to know at what point it gives up for future reference and anyone doing a search will no doubt read this thread and hope to find the answer

at 400 rwkws i would be starting to think about 2 044 to give you some room to play.

as i mentioned earlier 1 x 023 would be simply running out of legs.

Why?

I run a surge/external in mine and i drive it daily. I cant say its that much louder at all if the pump is mounted decently

i realli dont want to go threw all the trouble of fitting a surge tank and all the lines im after some thing i can just bolt in and fit the problem

i wanna get out of this the most cheapest way i can as well

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


  • Latest Posts

    • So, I've been a little busy on this car. I replaced the bonnet struts which is always satisfying but very confusing that nobody else on the planet seems to do this. Its just my routine first thing I do on any car I buy. The boot struts for both the tailgate and the separately opening glass window was a bastard. And, I found a fair bit of rust in the strut cavity. I filled it with rust converter and cleaned up as much of the dirt as I could. There was so much dirt. One piece of the trim was barely hanging on and so I've left it off. I'll try to get a replacement. You can see how disgusting and dirty it all was in this thread; I had to remove the little clips that hold the struts on the ball. The ones I took off had no clips and it was impossible to get them on with them in place. Fingers crossed they stay put. So, I turned my attention to the headlights, they were in a bad way and likely would stop rego. I took the headlights out and found the adjusters were all just loose. So, I fixed those and unclipped the lenses to clean them up. Couldn't believe how easy it was to take all this apart compared to the E90.   I also cleaned up the stockies which was awesome, these are super cool with lug nut covers. They're in good nic but the tyres are shot. I was going to use these for rego but in the end got a fresh pair of rubber for the 17's on the front of the car instead. The front bar of this car is from a late(r) model one. I don't think it's quite LCI but who knows. I'll need to find out. Anyway, the bar was missing the fog lights and the wiring and plugs were for the original ones so I got new plugs and some cheap fogs. I wasn't sure if missing original equipment would hamper my blue slip attempts. Had a couple of these little fellas helping out. But not Ben who got stuck behind the pool heater .... How embarressment.  I ordered new speed sensors for all corners because I knew one was out. I just got cheapies and will replace them with Bosch items when I can find Bosch items. Again, this was just for rego. Alas, it seems the blue speed sensors are not the same as the grey ones. Back they went and replacements ordered. In the end, with my new scan tool, it was just rear left that was shot. Replaced it and cleared the codes. All good now. Lastly, my aux (thermo) fan is being a bit odd. Its powering up at strange times and NOT powering up when I think it should (100C). While this can be caused by a few things, the most likely (for me) is the ambient temp sensor. Given mine reads -40.0C regardless of the temp, I figured it would be good to replace it. In the end, the sensor wiring was abysmal with (terrible) attempts made by somebody to fix it.   I fixed this all up but the sensor is only attached using pins into the wires. The plug is not there. Despite trying and trying to connect it securely it wouldn't work so a replacement sensor and plug is on the way. Oh, I also ordered a replacement piece of trim for the part missing here at the bottom. Ordered from Latvia for $70 delivered. I took a bit of a leap of faith because I didn't have the exact part number and, as usual, there were eleventy billion pieces of trim that looked to fit. Nailed it. Well, its not totally perfect but I think its more a 28 y/o car problem than a trim problem. And, as of today ..... I have bought the workshop manuals 2nd hand off a guy in tassie. 1000+ pages of E39 goodness, hopefully it helps me with the fan. I also have a new temp switch on the way incase its the problem. Stoked.
    • I don't even know that you want an M2 Competition as a track car. My rule for a track car is only risk as much as you're willing to completely total out. Clean stock C5 Z06 Corvettes out here are cheap. Buying someone else's already ruined track car is even cheaper. Maybe I'm just not that good a driver but even a Fiesta ST on the Nordschleife felt like as much car as I could realistically handle.
    • I've already gone over the cam. A new one is going in. An old one is coming out! The new one is smaller, with less overlap. It has way more lift, but it will be more mild mannered (hopefully, probably very minorly) I'm also measuring for two more mufflers, with the goal of having four mufflers in my car. But that probably will be done by an exhaust shop in a drive in, measure, buy parts, install parts later kind of deal.
    • Mine is not even a GTR and I've been resisting the urge to make it a power monster for the last 25 years. And as a consequence, I have driven it to work nearly every day across that span of time.
    • Since the motor is out, I suggest pop in a nice dirty LS chop cam. MOAR of this please:  
×
×
  • Create New...