R34 Fuel Pump

[ian_and1]

hi people

got a very quick question, was going to fit a bosch 040 into my R34 but it seemed a little big and sat a little high in the fuel tank for my liking, now i just need to no if any-1 has fitted a 040 in there and how does it go ? or what other fuel pump upgrades can be recommenced or what have people used?

Thanks in advance

[The Mafia]

they are a shit pump mate.

They have a bad mount, are noisy, and will fail prematurely.

Grab a Nismo 275lph pump. They slot straight into the tank like a factory item as they have their own bracket. VERY quiet too. (I have one)

Good for 350rwkw.

[ian_and1]

thanks heaps for that where could i source one of the nismo's for a decent price ?

[The Dan]

they are a shit pump mate.

Maybe for the application, but they are certainly not a shit pump.

[allthewaytotheskyline]

walbro pump is straight fit..

[Duncan]

I run a 040 in tank and it is fine for 300+ kw, has been running for years race use.

there is one issue with either 040 or 044 in tank, you need to sort out a pickup from the bottom of the tank as they are intended for external use. try a search on here there was a DIY thread with details of the fitting required for a perfect fit

[ian_and1]

Maybe for the application, but they are certainly not a shit pump.

car's got a fair bit done to it and should be pumping around 280-300kw

I run a 040 in tank and it is fine for 300+ kw, has been running for years race use.

there is one issue with either 040 or 044 in tank, you need to sort out a pickup from the bottom of the tank as they are intended for external use. try a search on here there was a DIY thread with details of the fitting required for a perfect fit

thanks for that mate ill have a lookie

[The Dan]

car's got a fair bit done to it and should be pumping around 280-300kw

I can imagine. I was referring to the fact that 040 pump is not the best pick for that style fuel tank. Not that it can't do the job of pumping fuel.

Too many people jump on here and bag products out without understanding why they fail or do not suit their application. Once again, not you, but many other people feel it necessary to knock something because they had a bad experience or their friend had a bad experience. Most of the time it's installer error or incorrect application usage.

If you want a pump that is going to do the job and will be a direct fit, then grab a Nismo, Tomei, SARD, HKS pump. They are all the same pump so get whichever one is cheapest at the time. If there is one thing you don't want to frig around with, it's fuel for your Skyline. It would have to be one of the most important things to consider in your upgrade list. Don't go second rate and don't be fooled by people who tell you a 255L/hr pump is rated to 500hp because all pumps are not the same.

Have a look at the pressure they pump those flow stats at. The Walbro stuff is fine at idle and for medium upgrades but when you start winding some boost in, you start upping the pressure in your fuel rail. The Walbro pumps reduce flow to approx 160-170L after about 60-65psi rail pressure.

I'm not bagging out the Walbro pump but it has it's place, as does the 040 (which is reaching the end of it's tether at that kind of power anyway)

For 300kw you need a minimum of 180L/hr @ 4bar. I have allowed for a small amount of room but realistically for your application you need something around 200L/hr @ 4bar (or above)

[The Dan]

300kw x 1.34 = 402hp + approx 80hp drivetrain loss in a 34 = 482hp at engine.

482 / 6 injectors = 80.33 x 5 = 401.66 cc

401.66 + 15% for extra = 462cc injectors for safety

6 cylinders x 0.462 = 2.772L/min = 166.32 L/hr

166.32 + 10% for safety = 183L/hr

Now keep in mind I have left 15% head room for injectors and a 10% head room for pump above that. In the real world, these figures are a little higher than they need to be but once you start revving past 7k, the fuel demand is very real. Work on these figures to pick the pump and keep in mind that any boost pressure should be added on top of your existing 40psi neutral fuel rail pressure to get the final rail pressure. eg. 40psi neutral rail pressure (when vac line is off) + 20psi boost = ~60psi rail pressure (depending on the reg you have also but this is just a guide). 60psi = 4.08bar so ...

180l/hr @ 4 bar

[ashneel]

running a 040 pump in my 34. was fitted by RE customs but havent had anyproblems with it. car atm is running 240 at the rears but goal is to hit 300 and ye was told this pump will be fine. name a fair few guys running 040 with 300+ and never had any problems.

[The Dan]

running a 040 pump in my 34. was fitted by RE customs but havent had anyproblems with it. car atm is running 240 at the rears but goal is to hit 300 and ye was told this pump will be fine. name a fair few guys running 040 with 300+ and never had any problems.

Agree.

But 350 would be pushing it IMO so I would stick to 320 and under for safety.

[ian_and1]

running a 040 pump in my 34. was fitted by RE customs but haven't had any problems with it. car atm is running 240 at the rears but goal is to hit 300 and ye was told this pump will be fine. name a fair few guys running 040 with 300+ and never had any problems.

you don't have any problems running the fuel a little low ? cos they said that could be a problem for how high it sits in the tank ?

And 3lit3 32 thanks heaps mate for your info/help it is greatly appreciated

[SXC-R34]

I highly recommend the NISMO fuel pump. stright fit in, quite, should run 350 RWKW with no probs. I know a guy had a prob with the bosch 040 in his R34, but thats doesn't mean it's shit cause a lot of people use and they recommend it. But I think for R34's Nismo's the way to go.