DemonZ Posted August 7, 2002 Share Posted August 7, 2002 does this pump (to the left) pose any problems for an EFI turbo setup of 400rwhp ? http://www.specialtauto.com/fuel-injection.shtml "At 12 volts, 60 GPH at 150 to 180 P.S.I. at shut off."--sounds juicey enough but what does "....at shut off" mean? Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted August 7, 2002 Share Posted August 7, 2002 Interesting page. See if they will give you flow rates for 60, 70 psi (equivalent to boost pressure of 25-35 psi). Shutoff pressure means the pressure where the pump will no longer flow anything, a somewhat useless spec. 12V is important, as it is a worst case for battery voltage while driving. If you have good wiring, you should get less than 1V drop from your battery float voltage of 14.5V or so. But it is the volume of fuel flowed at base fuel pressure + boost pressure needed for your 400hp that is THE IMPORTANT FLOW SPECIFICATION! Quote Link to comment Share on other sites More sharing options...
SHANE Posted August 9, 2002 Share Posted August 9, 2002 how the hell do you figure 14.5 volts????? i have never had a Z put out more than 12.9. Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted August 9, 2002 Share Posted August 9, 2002 Originally posted by SHANE:how the hell do you figure 14.5 volts????? i have never had a Z put out more than 12.9. LOL! It's just the voltage I measure at the battery with my meter. Matches sorta close to my dash voltmeter... I used to design battery chargers, 14.5 is close to the float voltage to maintain charge. I notice on the various Walbro pump flow maps they spec both 12V and 13.5V. I would expect you should be able to get 13.5V to your pump with good wiring and a capable alternator. Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted August 15, 2002 Share Posted August 15, 2002 the old bmw's and mercedes with 6 and v8 had huge fuel pumps.the cis injection looped most of the fuel back to tank.the bmw operating pressure was about 95 psi.jag v12 had a big pump too.some of us like to shop at the local pick&pull and leave the new stuff as a last resort. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted August 15, 2002 Share Posted August 15, 2002 I've routinely seen voltages of over 13 volts measured with my nifty cigarette lighter digital voltage gauge, it depends on how topped up the battery is, after you've been driving a while you can see it drop off to about 12.5 or so and also its RPM dependent higher revs show higher voltage on my meter (even after its hit the trigger RPM). Not sure how normal that is, but I've had no charging problems since going to the powermaster alternator and optima battery. Regards, Lone Ps: You wanna talk high fuel pressures? A buddy has a Alfa down here that has a Spica mechanical fuel injection unit. It runs between 260-300 lbs of pressure to its injectors, he said alfa's using that system rarely ever have a clogged injector. ). Quote Link to comment Share on other sites More sharing options...
fl327 Posted August 15, 2002 Share Posted August 15, 2002 13 or more is pretty good, when its 12 or 11 i check grounds, if its less i check grounds then check battery and alt. im running a bosch porsche 911 turbo world cup pump, its loud as heck and flows pretty good, i got it cheap though, if i didnt get it cheap i would go hunting some v8 car in the pick and pull for a pump and throw it over the fence, JK Quote Link to comment Share on other sites More sharing options...
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