8110 Posted June 7, 2008 Share Posted June 7, 2008 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. Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/ Share on other sites More sharing options...
DECIM8 Posted June 7, 2008 Share Posted June 7, 2008 (edited) 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 Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3926357 Share on other sites More sharing options...
SHANE666 Posted June 7, 2008 Share Posted June 7, 2008 +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... Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3926363 Share on other sites More sharing options...
8110 Posted June 8, 2008 Author Share Posted June 8, 2008 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? Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3927706 Share on other sites More sharing options...
Adriano Posted June 8, 2008 Share Posted June 8, 2008 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. Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3927820 Share on other sites More sharing options...
8110 Posted June 8, 2008 Author Share Posted June 8, 2008 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. Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3928303 Share on other sites More sharing options...
GMan Posted June 8, 2008 Share Posted June 8, 2008 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. Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3928317 Share on other sites More sharing options...
8110 Posted June 10, 2008 Author Share Posted June 10, 2008 What is the difference between the GSS-342 and GSS-341? Are both also "high pressure" pumps? Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3933859 Share on other sites More sharing options...
STATUS Posted June 11, 2008 Share Posted June 11, 2008 Fitment, one is nice and easy Nissan drop in the other is subaru drop in from memmory. Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3935089 Share on other sites More sharing options...
8110 Posted June 11, 2008 Author Share Posted June 11, 2008 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!!! Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3936960 Share on other sites More sharing options...
666DAN Posted June 12, 2008 Share Posted June 12, 2008 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! Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3937328 Share on other sites More sharing options...
R34NRG Posted June 12, 2008 Share Posted June 12, 2008 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? Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3937918 Share on other sites More sharing options...
R31Nismoid Posted June 12, 2008 Share Posted June 12, 2008 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. Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3938048 Share on other sites More sharing options...
R34NRG Posted June 12, 2008 Share Posted June 12, 2008 (edited) Because the fuel pump is dyingIts 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 Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3938429 Share on other sites More sharing options...
DECIM8 Posted June 12, 2008 Share Posted June 12, 2008 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! Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3938442 Share on other sites More sharing options...
R31Nismoid Posted June 12, 2008 Share Posted June 12, 2008 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 Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3938783 Share on other sites More sharing options...
8110 Posted June 12, 2008 Author Share Posted June 12, 2008 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. Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3939819 Share on other sites More sharing options...
R31Nismoid Posted June 12, 2008 Share Posted June 12, 2008 Reg is not needed at all, get that idea out of ya head dude. You need a fuel pump, simple as that Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3939848 Share on other sites More sharing options...
DECIM8 Posted June 13, 2008 Share Posted June 13, 2008 As above.. Fuel pump is dead replace it and the standard ecu will work itself out. Link to comment https://www.sau.com.au/forums/topic/222813-running-lean-on-an-er34/#findComment-3942027 Share on other sites More sharing options...
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