Some Fuel System Ramblings, 2011 Edition!
03-06-11, 11:10 PM
#1
Some Fuel System Ramblings, 2011 Edition!
Pulled from two other sites:
Toyota Supra Twin Turbo In Tank Pump (Adj FPR required)
260 lph @43psi @12v 220 lph @58psi @12v
290 lph @43psi @14v 260 lph @58psi @14v
Mazda RX-7 Twin Turbo
210 lph @43psi @12v
Mazda Cosmo, (HKS in-tank)
250 lph @43psi @12v
taken from: http://www.roadraceengineering.com/fuelpumptechtip.htm
Conclusions
The A'PEXi BNR32 fuel pump 404-A011 (an upgrade pump for the Nissan Skyline GT-R) is the highest flowing in-tank fuel pump at line pressures up to 75 psi and at 13.5 volts. At present (February 2004) I am not aware that this pump has been installed in any 3S car. However, it is installed in some Mazda cars that use a factory Denso fuel pump nearly identical in size and design to the 3S factory Denso fuel pump. The relief valve opens at about 75 psi, limiting use to boost pressures up to 30 psi if base fuel pressure is set at 45 psi. With available flow measurements at only 13.2 volts, we do not know yet how this pump performs at lower or higher voltage. Nevertheless, if this pump is installed with a re-wired electrical circuit (providing at least 13.2 volts during WOT operation), six injectors up to 720 cc/min can be supported. List price in the 2003 A'PEXi online catalog is $499.00. I have seen it advertised at online stores for $360 to $410.
The factory R33 Skyline GT-R and HKS Skyline upgrade 1407-RN019 fuel pumps are the second highest flowing in-tank fuel pumps at line pressures up to 75 psi and at 13.5 volts. These fuel pumps may flow a little less than the other pumps below 65 psi, but this is not important when using large injectors. It is the flow at the high boost ranges when large injectors would be required that is important. These pumps can support six injectors up to 640 cc/min with 13.5 supplied volts.
The Denso fuel pump 195130-1020 (the Supra Turbo MKIV pump) is one of the best in-tank upgrade choices if you are using injectors up to 550 cc/min and are providing at least 13 volts to the pump. When 18 volts are supplied, the Supra pump is good for injectors up to 880 cc/min. At 13.5 supplied volts no other in-tank pump, except for the R33 Skyline GT-R and A'PEXi BNR32 fuel pumps, flows significantly more fuel up to 70 psi line pressure or 27 psi boost. It is a direct drop-in replacement; all other non-Denso choices require some modification to the fuel pump assembly. It is as quiet as the stock pump. Best of all, it can cost only $180 at Conicelli Toyota. One disadvantage of the Supra pump is its relatively heavy current draw (at 13.5 V, 16A @ 43 psi, 19A @ 70 psi) and large decrease in flow as supplied voltage lowers. Good, heavy-gauge wiring (meaning re-wiring the fuel pump electrical circuit) is a requirement to get the most out of this pump.
The Walbro GSS341 model (also called the 255 lph HP) flows a little less than the Supra Turbo pump up to about 67 psi line pressure (24 psi boost), when 13.5 volts are supplied to both pumps. However, at 12 supplied volts, the Walbro GSS341 outflows the Denso 195130-1020 above 55 psi line pressure (compare John Cribb's Supra pump data to the Walbro charts). Like the Supra fuel pump, the Walbro GSS341 is an excellent choice for 450 cc/min injectors, especially if the fuel pump has not been re-wired (12 supplied volts). Also like the Supra pump, it can be used with up to 610 cc/min injectors if 13.5 volts are supplied, and up to 720 cc/min injectors if at least 16 volts are supplied. The Walbro GSS341 draws about half as much current (at 13.5 V, 8A @ 43 psi, 10A @ 70 psi) as the Supra fuel pump. Some slight modification to the fuel pump assembly is required and it may not be as quiet as the Denso pumps. The price is even less than the Supra pump at $100 to $150.
Whatever pump you decide to go with, the Cosmo and 300ZX pumps are also good choices, the voltage at the pump is critical for good flow. Check the voltage at the pump. If it is below 11 volts try the resistor/relay by-pass modification first to see if voltage increases to 11.5 to 12 volts. For more voltage you will have to re-wire the circuit and maybe add a step-up voltage regulator.
taken from: http://www.stealth316.com/2-fuelpumpguide.htm
Toyota Supra Twin Turbo In Tank Pump (Adj FPR required)
260 lph @43psi @12v 220 lph @58psi @12v
290 lph @43psi @14v 260 lph @58psi @14v
Mazda RX-7 Twin Turbo
210 lph @43psi @12v
Mazda Cosmo, (HKS in-tank)
250 lph @43psi @12v
taken from: http://www.roadraceengineering.com/fuelpumptechtip.htm
Conclusions
The A'PEXi BNR32 fuel pump 404-A011 (an upgrade pump for the Nissan Skyline GT-R) is the highest flowing in-tank fuel pump at line pressures up to 75 psi and at 13.5 volts. At present (February 2004) I am not aware that this pump has been installed in any 3S car. However, it is installed in some Mazda cars that use a factory Denso fuel pump nearly identical in size and design to the 3S factory Denso fuel pump. The relief valve opens at about 75 psi, limiting use to boost pressures up to 30 psi if base fuel pressure is set at 45 psi. With available flow measurements at only 13.2 volts, we do not know yet how this pump performs at lower or higher voltage. Nevertheless, if this pump is installed with a re-wired electrical circuit (providing at least 13.2 volts during WOT operation), six injectors up to 720 cc/min can be supported. List price in the 2003 A'PEXi online catalog is $499.00. I have seen it advertised at online stores for $360 to $410.
The factory R33 Skyline GT-R and HKS Skyline upgrade 1407-RN019 fuel pumps are the second highest flowing in-tank fuel pumps at line pressures up to 75 psi and at 13.5 volts. These fuel pumps may flow a little less than the other pumps below 65 psi, but this is not important when using large injectors. It is the flow at the high boost ranges when large injectors would be required that is important. These pumps can support six injectors up to 640 cc/min with 13.5 supplied volts.
The Denso fuel pump 195130-1020 (the Supra Turbo MKIV pump) is one of the best in-tank upgrade choices if you are using injectors up to 550 cc/min and are providing at least 13 volts to the pump. When 18 volts are supplied, the Supra pump is good for injectors up to 880 cc/min. At 13.5 supplied volts no other in-tank pump, except for the R33 Skyline GT-R and A'PEXi BNR32 fuel pumps, flows significantly more fuel up to 70 psi line pressure or 27 psi boost. It is a direct drop-in replacement; all other non-Denso choices require some modification to the fuel pump assembly. It is as quiet as the stock pump. Best of all, it can cost only $180 at Conicelli Toyota. One disadvantage of the Supra pump is its relatively heavy current draw (at 13.5 V, 16A @ 43 psi, 19A @ 70 psi) and large decrease in flow as supplied voltage lowers. Good, heavy-gauge wiring (meaning re-wiring the fuel pump electrical circuit) is a requirement to get the most out of this pump.
The Walbro GSS341 model (also called the 255 lph HP) flows a little less than the Supra Turbo pump up to about 67 psi line pressure (24 psi boost), when 13.5 volts are supplied to both pumps. However, at 12 supplied volts, the Walbro GSS341 outflows the Denso 195130-1020 above 55 psi line pressure (compare John Cribb's Supra pump data to the Walbro charts). Like the Supra fuel pump, the Walbro GSS341 is an excellent choice for 450 cc/min injectors, especially if the fuel pump has not been re-wired (12 supplied volts). Also like the Supra pump, it can be used with up to 610 cc/min injectors if 13.5 volts are supplied, and up to 720 cc/min injectors if at least 16 volts are supplied. The Walbro GSS341 draws about half as much current (at 13.5 V, 8A @ 43 psi, 10A @ 70 psi) as the Supra fuel pump. Some slight modification to the fuel pump assembly is required and it may not be as quiet as the Denso pumps. The price is even less than the Supra pump at $100 to $150.
Whatever pump you decide to go with, the Cosmo and 300ZX pumps are also good choices, the voltage at the pump is critical for good flow. Check the voltage at the pump. If it is below 11 volts try the resistor/relay by-pass modification first to see if voltage increases to 11.5 to 12 volts. For more voltage you will have to re-wire the circuit and maybe add a step-up voltage regulator.
taken from: http://www.stealth316.com/2-fuelpumpguide.htm
03-06-11, 11:27 PM
#2
Original Gangster/Rotary!
iTrader: (213)
Neil, welcome to 2006 
taken from the archives: https://www.rx7club.com/3rd-gen-archives-73/some-fuel-system-ramblings-578521/
taken from the archives: https://www.rx7club.com/3rd-gen-archives-73/some-fuel-system-ramblings-578521/
neil
03-06-11, 11:41 PM
#4
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