Although, Bill IS sharing a pressure transducer with his Autometer fuel pressure gauge. One thing he might try is disconnecting the signal wire back to the gauge. It could be an electrical interference issue...?
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Drag Week 2012 - Project GIRTST 71 Mustang (get it right the second time)
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I'm not sure I'm reading the graphs right - but while under power going through the gears - the vertical snapshot line shows AFRs in the 16 range - while the fuel pressure is oscillating... I'm not sure if the frequency of oscillation of pressure and the RPM of the A1000 are related - but it seems like the pump could be cavitating and "sucking air" in bursts as the impeller passes the input port of the pump.
I have a feeling the AFR isn't really 16?
What was the fuel level in the tank during these passes? Can you fill the tank and do a couple quick WOT blasts on the street to see if the pressure oscillations repeat with more fuel in the tank? That would at least prove or disprove the sump cure idea.There's always something new to learn.
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Originally posted by milner351 View PostI'm not sure I'm reading the graphs right - but while under power going through the gears - the vertical snapshot line shows AFRs in the 16 range - while the fuel pressure is oscillating... I'm not sure if the frequency of oscillation of pressure and the RPM of the A1000 are related - but it seems like the pump could be cavitating and "sucking air" in bursts as the impeller passes the input port of the pump.
I have a feeling the AFR isn't really 16?
What was the fuel level in the tank during these passes? Can you fill the tank and do a couple quick WOT blasts on the street to see if the pressure oscillations repeat with more fuel in the tank? That would at least prove or disprove the sump cure idea.
Bill if you can, send me the actual datalogs and I'll go over them tonight after work.www.realtuners.com - catch the RealTuners Radio Podcast on Youtube, Facebook, iTunes, and anywhere else podcasts are distributed!
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Originally posted by dieselgeek View PostYep, but that would only bother me if I knew for sure that they were sampling from the exact same port, hose, etc. I can't remember how he had his regulator plumbed.
Fuel set-up is chapter and verse from Aeromotive's fuel system planner for 1300 N/A HP with the exception that I'm running the larger capacity 13110 pro series regulator.(see installation instructions link)
Discover Aeromotive’s superior fuel systems, where cutting-edge aerospace engineering meets automotive passion. Explore our range of high-performance fuel pumps, filters, and regulators, designed for reliability and efficiency at any speed, any angle, or any condition.
Drag Week 2006 & 2012 - Winner Street Race Big Block Naturally Aspirated - R/U 2007 Broke DW '05 and Drag Weekend '15 Coincidence?
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I didn't realize we weren't referencing manifold pressure.
That makes this situation even more confusing.
Bill, one thing to check before freaking out and swapping more parts - disconnect the signal that goes to your Fuel Pressure gauge and make a pass. The fact that things go sketchy when your electrical system is under it's greatest stress (WOT) has me thinking it's possibly just a noise issue. Maybe we're pulling too much current from that pressure transducer with two devices reading it's output.www.realtuners.com - catch the RealTuners Radio Podcast on Youtube, Facebook, iTunes, and anywhere else podcasts are distributed!
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Originally posted by milner351 View PostI'm not sure I'm reading the graphs right - but while under power going through the gears - the vertical snapshot line shows AFRs in the 16 range - while the fuel pressure is oscillating... I'm not sure if the frequency of oscillation of pressure and the RPM of the A1000 are related - but it seems like the pump could be cavitating and "sucking air" in bursts as the impeller passes the input port of the pump.
I have a feeling the AFR isn't really 16?
What was the fuel level in the tank during these passes? Can you fill the tank and do a couple quick WOT blasts on the street to see if the pressure oscillations repeat with more fuel in the tank? That would at least prove or disprove the sump cure idea.
AFR down track on this pass was in the low 12's. I added fuel after the True Street laps, but the NMCA changed all the classes to 8th mile after True street Sat. afternoon, in order to get the 460 cars through all of the various ladders with the 7:30am-7 PM Saturday, 9:30 AM-6 PM curfews. My red light 1/8 mile pass later in the day showed 12.3-12.5 afr's for the shorter duration of the 8th mile run.Drag Week 2006 & 2012 - Winner Street Race Big Block Naturally Aspirated - R/U 2007 Broke DW '05 and Drag Weekend '15 Coincidence?
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Originally posted by Bob Holmes View PostFuel pump wiring is what gauge?Drag Week 2006 & 2012 - Winner Street Race Big Block Naturally Aspirated - R/U 2007 Broke DW '05 and Drag Weekend '15 Coincidence?
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