Static fuel pressure test
By Robert Lane @ http://excoboard.com/exco/index.php?boardid=18653
I highly recommend the Holley 12-803 regulator for nitrous use. It is the least expensive and it has the longest track record of proven reliability. This deadhead regulator can be adjusted to static fuel pressure or flowing fuel pressure. The difference between the two should be less than .25-30-tenths. If there is more than ½-pound difference between static and flowing fuel pressure, something is wrong and usually indicates you need a higher GPH fuel pump. The Holley regulator is a “deadhead regulator”. The fuel pump is constantly pumping against the regulator & fuel solenoids. Static fuel pressure can very accurately be set with a Holley 12-803 Regulator in the 3.5-7.5 PSI range. To set static fuel pressure you need an accurate gauge and a liquid filled gauge makes it much easier to read static. A standard gauge without the dampening effect of the liquid will respond real quickly and makes it a little harder to judge but it can be done. Connect a #4-an or #6-an line to the gauge, this will allow you to attach it to a test port fitting on the Holley 12-803 regulator for pressure testing. Connect the gauge to the regulator and turn on the fuel pump while observing the gauge. The needle will climb up quickly and momentarily stop on what the regulator is set on and then it will start creeping up to the line pressure of the fuel pump since it is deadheaded system. When the gauges needle momentarily stops (For example on 5.3-PSI), after you activate the pump and then starts to climb again; the point it stops on (5.3-PSI), will equal 5.0-psi flowing pressure through a .073-inch or Holley #70 jet The static test will be .25-.40-tenths of a pounds higher than your actual flowing fuel pressure. What happens is when you activate the pump the pressure goes up to what the regulator is set on and the fuel pump will soon over power the spring/diaphragm in the regulator and continue to climb to the line output pressure of the electric fuel pump. To simplify checking static pressure I recommend putting a toggle switch in the engine compartment of your car within easy reach when checking pressure and adjusting the regulator. Check it two or three times to verify. This toggle switch will activate the fuel pump so you can momentarily turn it on and off to get your reading. You can use this to check your fuel pressure between rounds instead of the hassle of getting fuel everywhere and mess of hooking up your Flow tool to check the pressure every time. You can use the static pressure tester as a reference and when you get some practice and feel comfortable you can set your pressure this way also. Setting your pressure flowing is the most common way and that is the best way to do it especially for someone that has not been tuning nitrous systems for a long time, but an experienced/advanced tuner can do it both ways and be accurate.
Any questions for Robert Lane please go to his forum @ http://excoboard.com/exco/index.php?boardid=18653
FASTLANE NITROUS TECHNOLOGY is a nitrous development company. We work with each person as an individual to develop or modify their nitrous system for their specific application. We even repair/modify most competitor’s designs. Most update/repair programs are affordable. These programs include wet-flow testing to verify proper operation, nitrous flow analysis to calibrate the system, which includes a wet-flow portfolio for easier tuning. There's a reason we have these world records and championships, we spend time with the customer to build what they need to win and enjoy their day at the races. We specialize in higher end nitrous systems designed for competition in "Heads Up" Drag Racing. If you have the desire to win races, championships and set records then you have come to the right shop.
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Static fuel pressure test
By Robert Lane
I highly recommend the Holley 12-803 regulator for nitrous use. It is the least expensive and it has the longest track record of proven reliability. This deadhead regulator can be adjusted to static fuel pressure or flowing fuel pressure. The difference between the two should be less than .25-30-tenths. If there is more than ½-pound difference between static and flowing fuel pressure, something is wrong and usually indicates you need a higher GPH fuel pump. The Holley regulator is a “deadhead regulator”. The fuel pump is constantly pumping against the regulator & fuel solenoids. Static fuel pressure can very accurately be set with a Holley 12-803 Regulator in the 3.5-7.5 PSI range. To set static fuel pressure you need an accurate gauge and a liquid filled gauge makes it much easier to read static. A standard gauge without the dampening effect of the liquid will respond real quickly and makes it a little harder to judge but it can be done. Connect a #4-an or #6-an line to the gauge, this will allow you to attach it to a test port fitting on the Holley 12-803 regulator for pressure testing. Connect the gauge to the regulator and turn on the fuel pump while observing the gauge. The needle will climb up quickly and momentarily stop on what the regulator is set on and then it will start creeping up to the line pressure of the fuel pump since it is deadheaded system. When the gauges needle momentarily stops (For example on 5.3-PSI), after you activate the pump and then starts to climb again; the point it stops on (5.3-PSI), will equal 5.0-psi flowing pressure through a .073-inch or Holley #70 jet The static test will be .25-.40-tenths of a pounds higher than your actual flowing fuel pressure. What happens is when you activate the pump the pressure goes up to what the regulator is set on and the fuel pump will soon over power the spring/diaphragm in the regulator and continue to climb to the line output pressure of the electric fuel pump. To simplify checking static pressure I recommend putting a toggle switch in the engine compartment of your car within easy reach when checking pressure and adjusting the regulator. Check it two or three times to verify. This toggle switch will activate the fuel pump so you can momentarily turn it on and off to get your reading. You can use this to check your fuel pressure between rounds instead of the hassle of getting fuel everywhere and mess of hooking up your Flow tool to check the pressure every time. You can use the static pressure tester as a reference and when you get some practice and feel comfortable you can set your pressure this way also. Setting your pressure flowing is the most common way and that is the best way to do it especially for someone that has not been tuning nitrous systems for a long time, but an experienced/advanced tuner can do it both ways and be accurate.