fuel pumps

[Fly_With_Sky]

hey guys i expect to be pushing around 190rwkw when i install and tune the mods i just bought for my car (boost controller, fmic) or am in the process of buying (apexi safc) already got the full exhaust and air filter. Now i suppose i will have to change my fuel pump as ive heard it dies around that power level on a r33. i was curious as to what pump would do the job should i just get the bosch 044, go a larger in tank replacement pump from GCG??, also i was wondering what those walbro fuel pumps are like?? they are rated at 500hp, so will that do the job for my power level??

Also, i wont need a regulator as well will i as the stock one along with the injectors will still be doing the job well enough right??

any info in helping me get the fuel side of things correct will be appreciated...

[R31Nismoid]

walbro will do the job.

but get a bosch as they are cheaper unless you get a good price on a walbro that is.

probably for a mild upgrade a Bosch 984 or something.

for only 190rwkw it'll do you fine and dandy

stock reg & stock injectors will be fine for those mods.

take it further you'll need bigger pump/injectors blah blah.

but if your stickn to 190rwkw or so. as above

[Fly_With_Sky]

thanks

yeh i found walbro (550hp) pumps for 250-300 bucks which is cheaper than the bosch 044 pump but thanks for reply

[JimX]

You don't need an 044 pump. I got one and I didn't need one that big, but I got it anyway because it was so cheap. A 910 or 040 should be cheaper and better than a Walbro. The cost will balance out with the work you have to do to fit it, but if you get 550hp out of your Walbro I will give you $5. They rate their pump flow in a dodgy arsed way, with no fuel pressure. Under normal fuel pressure of a Skyline it's more like 400hp. I believe they now have a "high pressure" version, which you should get if you are considering a Walbro. The old model will not get you much more power than stock. Which is ok if your old pump is dying or dead anyway, but I would want to pay less than $300 for it.

[adznight]

I've got problems with my pump at 200kw. I'm just putting in a Bosch 975. Flows more than a Standard or GTR pump but not huge amounts. All I need though, as far as I know that it

[Anquetil]

While were on the topic of fuel pumps is it just me or do other people notice that their cars seem to have more power after filling up? As opposed to 1/4 or 1/2 a tank.

I noticed this when my car had both 145 & 185 at the wheels.

Is it likely the factory fuel pump is struggling when low, or stale week old fuel, or just more weight in the back giving more downforce pressure/traction?

[NickR33]

While were on the topic of fuel pumps is it just me or do other people notice that their cars seem to have more power after filling up? As opposed to 1/4 or 1/2 a tank.

 

I noticed this when my car had both 145 & 185 at the wheels.

 

Is it likely the factory fuel pump is struggling when low, or stale week old fuel, or just more weight in the back giving more downforce pressure/traction?

...good question... anyone care to enlighten us?

[adznight]

If your fuel pump does struggle then you risk knock in the engine. If it does sense knock I'm pretty sure it will retard power. I know it does in mine but I run a Power FC. Not sure what the stock ECU does. Maybe if you have a fuel pickup problem it might be running low on power but I'd be more worried about the engine knock. You should have your AFR looked at to check it out and confirm.

[JimX]

If your fuel pump does struggle then you risk knock in the engine. If it does sense knock I'm pretty sure it will retard power. I know it does in mine but I run a Power FC. Not sure what the stock ECU does.

If you have a standard PowerFC then it doesn't retard the timing with a high knock. The standard ECU does retard the timing.

[adznight]

Ah sorry, my mistake.

[KamikazeR33]

ive seemed to have no problems with stock pump or regulator at the power my cars at now

altho i do have a new bosch f/p and malpassi reg waiting to go in when i can be bothered

[KamikazeR33]

oh n ive been running it like this for bout 3 1/2 weeks - afrs are correct aswell