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How much can R33 stock fuel pump push (in kw)

Starionturbo
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R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Just some advise, something learnt by experience.  Buy the 040, build a surge tank a little bigger, and mount the 040 inside the surge tank.  This will help reduce the noise from the pump (and trust me a 044/040 is bloody noisy), you can then put as much sound damping material, as you prefer, all over the surge tank to reduce the noise even more.  Fuel will also act as a coolant for the pump.  With a 044 (external) you are unable to dampen the noise as you run a risk of overheating the pump (so i have been told).

Surge tanks? hrm... So what are people going to use as a lifter? Thier old pump that is dying? Thats not a good idea. You should have 2 new pumps, one can be of far lesser flow of course.

As you dont wanna starve the $$ pump later cause you dont know when your stocker pump its died. Then its more $$$ outta your pocket.

For the basic application an intank is best and works quite well.

Im fairly certain my Ext pump on my surge tank is a 040/044, if not its a 984, and i cant really hear it that loud at all and its open in the boot and all

Al Grand Master

Al

Posted
Posted
I will get the Fuel pump when I get the PFC tuned.

As far as injectors go, ive spoken to many a performance shop, and said the RB25s injectors seem to be at there max at about 250-260 rwkw.

With what fuel pressure reg?

You would really be pumpin up the pressure in the fuel rail to make this power with std inj. :uhh:

Sard 550cc injectors, 235rwkw, 80% max duty cycle@full throttle

At 185rwkw, std injectors, std reg, 93% max duty cycle@full throttle. So where are you going to find the extra fuel to acheive 250-260rwkw with std injectors?

Al Grand Master

Al

Posted
Posted
Gee ur making me think hard now (new owner has had it for about 3mths).

R33 GTS-t, 198rwkw, 3" full nismo exhaust (pretty quiet compared to most GTS-t's), std turbo, std ecu, fmic, k&n, ex cam gear.

:rant:

Nah buddy, i was refering to fuel pump set-up.

Car: R33

Pump: in boot (Ext); in tank; Under car (Ext); etc ?

Al Grand Master

Al

Posted
Posted
Surge tanks? hrm... So what are people going to use as a lifter? Thier old pump that is dying? Thats not a good idea. You should have 2 new pumps, one can be of far lesser flow of course.

As you dont wanna starve the $$ pump later cause you dont know when your stocker pump its died. Then its more $$$ outta your pocket.

For the basic application an intank is best and works quite well.

Im fairly certain my Ext pump on my surge tank is a 040/044, if not its a 984, and i cant really hear it that loud at all and its open in the boot and all

100% agreed....

Intank 040 is best for general application, but if doing alot of track days i would consider surge tank. Ppl should also get in the habit of filling up when gauge reads a quater, to ensure fuel starvation will not happen an to keep the pump cool.

You must have a different opinion of what is loud, as i heard your pump and it is on par with mine, and yes yours appeared to be a 044 just like mine :rant:

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
As far as injectors go, ive spoken to many a performance shop, and said the RB25s injectors seem to be at there max at about 250-260 rwkw.

depends what ECU

but 9 times outta 10 you will never get close to that

TommO Grand Master

TommO

Posted
Posted

I've got a stock R33 S2... my thoughts:

I checked mine on the dyno and it was running lean (13.5:1 AFRS). Turns out the pump was on the way out, and it wasn't getting enough volts. For a few hundred dollars, I don't see why you wouldn't upgrade to a better one to ensure your engine doesn't go bang, especially considering it's a rather common problem to have the fuel pumps let go.

I fitted a Walbro 500HP pump and it's been fine ever since :rant:

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
You must have a different opinion of what is loud, as i heard your pump and it is on par with mine, and yes yours appeared to be a 044 just like mine :rant:

maybe :)

but if i cant hear it whilst driving along over the exhaust, then i dont care as a general rule.

  • 2 weeks later...
paulr33 Grand Master

paulr33

Posted
Posted
I've got a stock R33 S2... my thoughts:

I checked mine on the dyno and it was running lean (13.5:1 AFRS). Turns out the pump was on the way out, and it wasn't getting enough volts. For a few hundred dollars, I don't see why you wouldn't upgrade to a better one to ensure your engine doesn't go bang, especially considering it's a rather common problem to have the fuel pumps let go.

I fitted a Walbro 500HP pump and it's been fine ever since :P

:werd:

This is why I had my pump changed. Also fixed my annoying starting issue where it would never crank on first turn of the key to full start. You would have to turn it to 3 and wait a few seconds before trying and then it would crank over. The stock pump is one intank pump and thats it

  • 6 years later...
paulr33 Grand Master

paulr33

Posted
Posted

the injectors and regulator control how much fuel goes into the engine, not the pump

the pump provides the rail with pressure and flow

as long as you have enough pressure and flow it is fine

its only when you start sucking more power out of the engine, thus using more fuel you need a higher flowing pump to keep up

if you dont get a higher flowing pump, when you make more power, the engine uses more fuel and sucks more fuel off the rail

but because you have the original pump it can only flow so much fuel and pressure, thus you don't get enough fuel into the rail and injectors

end result is you start to lean out the AF/R fuel mixture, which in turn causes excessive exhaust gas temps and melts the valves and blows the motor

a fuel pump is not something to be short changed or skimped on to save $100

re: reliability

if a fuel pump fails, the engine stalls and it's fine

if a fuel pump cant keep up flow rate and keeps working - this is critical and kills the motor

this is why its important to buy a genunie fuel pump that is rated correctly for your usage

and an even better insurance policy is to have an AF/R guage with warning

welcome from 2005

89CAL Grand Master

89CAL

Posted
Posted

The pump provides flow, the regulator provides pressure/restriction

Tomei/nismo/HKS pump is still the way to go. I'm so happy with mine, hasn't missed a beat and is quieter then the common alternatives (walbro, Bosch)

Worth spending the extra money

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