Running Lean On An Er34

[8110]

Hi. My ER34 is running pretty lean at high revs (boosting at 0.8) as data was shown via a dyno. The car is running on stock ECU and I have no plans to upgrade to an aftermarket ECU due to budgetary concerns.

My question is. Could I run a bigger fuel pump (perhaps a factory BNR34 unit) and a fuel regulator to curb this problem?

Or would there be no difference due to the factory ECU has already maxed out the injectors?

Thanks for your comments.

[DECIM8]

Most likely the fuel pump is/already is on its way and it will need replacement. Yes replace with a GTR pump and no if its got stock everything no need for a Fuel Reg..

Id recommend a new pump as would most people on the forum as the GTR one will likely fall to the same fate (they are 10 yrs old approx)

The pump should end your problems.

If you are using a bigger turbo for some reason you may need to use a fuel reg to max the injectors. If thats the case perhaps a upgrade is what you need (injectors and ecu)

Edited June 7, 2008 by DECIM8

[SHANE666]

+1 with Nath....

you could get one for cheap from the traders section...160 bucks i think.

not sure what else could be causing the prob...

[8110]

DECIM8, yea noted on those used factory BNR34 fuel pump. They may be on its way out too.

Ok, so a new pump is definitly better. Are those from Walbro good enough?

I am running stock turbine. Actually, would a piggy back fuel mangement, say a S-AFC solve my problem or a new fuel pump is the way to go? Fuel regulator isn't necessary?

[Adriano]

Your car s running lean because there is something wrong with it. Most likely culprit is the fuel pump. A genuine walbro will be up to the task as long as you continue to run the stock turbo.

[8110]

What model of Walbro shall I be looking at for the ER34?

Any other alternatives? Sard? Nismo? Tomei? Cost and function wise?

Many thanks for your advice.

[GMan]

for walbro id say GSS-342

you can also get a nismo, sard or a bosch. but all are like twice as much in price if not more.

[8110]

What is the difference between the GSS-342 and GSS-341? Are both also "high pressure" pumps?

[STATUS]

Fitment, one is nice and easy Nissan drop in the other is subaru drop in from memmory.

[8110]

Ok. So Walbro GSS-342 it is.

I just scanned my dyno chart for comments.

Look at the bottom graph for the AF ratio. The blue line from the top down is my AF ratio. The red broken line represents 12.2. Am I running dangerously lean?

HELP!!!

[666DAN]

Good grief, that's bad! Hopefully it's just the pump. At 0.8bar I was still seeing 11's....back the boost off, stopping driving hard in any way shape or form!

[R34NRG]

how the f*k is it that lean wen your still only running the car in its factory state.

are you sure no ones tampered with the car?

[R31Nismoid]

how the f*k is it that lean wen your still only running the car in its factory state.

Because the fuel pump is dying

Its probably the top 10 of Skyline basics.

[R34NRG]

Because the fuel pump is dying

Its probably the top 10 of Skyline basics.

how is the fuel pump dying if nothings changed from the factory?

::edit::

sorry i didnt realise he was running higher boost, which is still a bit odd, i ran close to 1bar and never had issues.

meh

Edited June 12, 2008 by R34NRG

[DECIM8]

It could have 200km on the engine, it could have been run very empty many times.. If so its been abused so needs replacing.

Hopefully hes checked his filter first.

Woo I just got my Tomei Pump, man this kit is good comes with new seals and even clips!

[R31Nismoid]

how is the fuel pump dying if nothings changed from the factory?

Same way any other pump does - Its called time

Most Nissan pumps fail or perform under par fairly quickly. Part and parcel.

I've had stock pumps fail in factory standard cars before, its nothing new at all

[8110]

You guys reckon which route I should take (can't afford a standalone)

Option 1

Walbro fuel pump and a fuel regulator

Option 2

A piggyback fuel management, eg. SAFC or SAFC NEO

Thanks.

[R31Nismoid]

Reg is not needed at all, get that idea out of ya head dude.

You need a fuel pump, simple as that

[DECIM8]

As above.. Fuel pump is dead replace it and the standard ecu will work itself out.