Fuel Pump

[OoskylineoO]

hey guys, wondering if changing to an aftermarket fuel pump or gtr fuel pump in an NA would do any difference?

[Careless]

they'll both hold up fine. as long as it can keep the pressure up, which either a walbro or a gtr pump will be able to do, in the case of N/A.

So get whatever is cheaper for you.

GTR comes with 300hp factory. and can pump for about 400 or more. so you'll be fine with either.

[OoskylineoO]

oh ok. Will changing to a higher rating fuel pump will actually have a slight increase in responsiveness or power?

[Cubes]

No.. Not unless the old pump was on its last legs and leaning out.

[abu]

No.. Not unless the old pump was on its last legs and leaning out.

Thats right, there is no point.

If anything it will just run slightly more rich, which is pointless..

Edited September 16, 2007 by abu

[R34GTFOUR]

Thats right, there is no point.

If anything it will just run slightly more rich, which is pointless..

why will it run more rich?

fuel pressure is controlled by the FPR so at the end of the day you can stick a bigger fuel pump and the extra flow provided if its not needed with just be sent back to the tank.

As mentioned, the pump will only make a difference if the old one isnt up to the task, if the old one is capable to send the amount of fuel needed to hold the correct pressure to the fuel rail right through the rev range the wont be a difference.

[unarmed_skyline]

if the new pump is capible of flowing more fuel at the same pressure yes you will run rich, you would need an adjustable fuel press reg to tune it to optimum presure then you might be able to squese a little bit out of the upgrade but its really not worth it at all untill you neer to or over the flow rate of the current fuel pump, if youve upgraded a lots of things already, ie exhause intake cams, ecu, or turbo conersion ect then yes you will need one but on a stock car its pointlesss

[R34GTFOUR]

if the new pump is capible of flowing more fuel at the same pressure yes you will run rich, you would need an adjustable fuel press reg to tune it to optimum presure then you might be able to squese a little bit out of the upgrade but its really not worth it at all untill you neer to or over the flow rate of the current fuel pump, if youve upgraded a lots of things already, ie exhause intake cams, ecu, or turbo conersion ect then yes you will need one but on a stock car its pointlesss

the r33 that we installed a 023 into didnt change in the slightest with the new pump, and thats a pump that is rated to 700hp. Didnt run more rich, and nothing else was changed ie it still had the stock fpr.

i know what your saying but in stockish appilications i dont see how it would make a noticeable difference to the afr

[SKiT_R31]

the r33 that we installed a 023 into didnt change in the slightest with the new pump, and thats a pump that is rated to 700hp. Didnt run more rich, and nothing else was changed ie it still had the stock fpr.

i know what your saying but in stockish appilications i dont see how it would make a noticeable difference to the afr

i push a bosch 023 on my car, pushed the fuel pressure from 32psi to 40psi, but thats probably just because of the higher pressure from the pump on the adjustable fpr.

i noticed more response, also - when you revved the car with the old pump the fuel pressure dropped right back and slowly build up (leaning the car obviously when you first stomp it) now it never dips, so its better in that respect.

but then my car needed it, as it now makes over 150kw, and it had a stock r31 pump made to feed about 80...

[NA_R33]

My 33 made close to 300rwhp on a standard pump, u will gain nothing from upgrading the pump.

[mad082]

the only time a new pump will make any difference is if the old one isn't doing the job. i installed a 040 into a mates 33 and it dropped about 15hp cause the old pump was dying and causing it to lean out a bit. the new pump dropped the AFRs to where they should be, and stopped it pinging its arse off.

[SKiT_R31]

the only time a new pump will make any difference is if the old one isn't doing the job. i installed a 040 into a mates 33 and it dropped about 15hp cause the old pump was dying and causing it to lean out a bit. the new pump dropped the AFRs to where they should be, and stopped it pinging its arse off.

exactly, there wont be a gain in having a bigger pump, but makes things a bit more reliable if your starting to ask for a fair bit more power than stock