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SVTPerformance's Chain of Restaurants
The Distillery
New e85 car voltage drop to 12v at 4500 rpm
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<blockquote data-quote="black03" data-source="post: 13023240" data-attributes="member: 4037"><p>Where have you heard about our systems dropping pressure? </p><p></p><p>Our system is a simple mechanical fuel system just like any other return system. Pumps run full time at full voltage and pressure gets regulated by the 1:1 boost reference regulator. It's not abnormal to see a small pressure drop on a return system. 2-3psi at high RPM's is pretty normal. Higher pressure drops can be caused by several things and should be addressed immediately.</p><p></p><p>If you're running our system and having higher pressure drops then 2-3psi then I would check. </p><p></p><p>Pump install height- If the pumps weren't installed to the correct height in the hat they may be bottoming out on the floor of the fuel tank. This will definitely cause a pressure drop as the pumps will starve for fuel when the pre-filters are pinched together. It's also common that the bottom of the fuel tank is bent in from being jacked up in the center of it at a previous date. So even if the pumps are installed to the correct height the bent tank will still press on the pre-filters choking the pumps. </p><p></p><p>Voltage- A bad alternator or wiring will also cause pressure drops. The 03-04 cobra are notorious for this. You need to verify that your pumps are seeing constant 13-13.5V. If you're seeing less than that at any point as the voltage drops so will fuel pressure. </p><p></p><p>How the wiring was done- We recommend installing our wire harness by connecting the trigger wire to the green/yellow wire pre-FPDM. This will trigger the pumps to run full time and see a constant 13-13.5V once the key is turned to the on position. So whether you actually start the car or just turn the key on the pumps will have full voltage and run full time. There have been others on this forum who have chosen to trigger the relays with the POST FPDM wire. That works as well but needs to be tuned for. If not the signal to the relays will see variable voltage and will not provide a full constant 13-13.5V to the pumps. Tuners will typically tell the car to run 100% duty cycle when wiring their cars this way. </p><p></p><p>Hope that helps. </p><p></p><p>Jared</p></blockquote><p></p>
[QUOTE="black03, post: 13023240, member: 4037"] Where have you heard about our systems dropping pressure? Our system is a simple mechanical fuel system just like any other return system. Pumps run full time at full voltage and pressure gets regulated by the 1:1 boost reference regulator. It's not abnormal to see a small pressure drop on a return system. 2-3psi at high RPM's is pretty normal. Higher pressure drops can be caused by several things and should be addressed immediately. If you're running our system and having higher pressure drops then 2-3psi then I would check. Pump install height- If the pumps weren't installed to the correct height in the hat they may be bottoming out on the floor of the fuel tank. This will definitely cause a pressure drop as the pumps will starve for fuel when the pre-filters are pinched together. It's also common that the bottom of the fuel tank is bent in from being jacked up in the center of it at a previous date. So even if the pumps are installed to the correct height the bent tank will still press on the pre-filters choking the pumps. Voltage- A bad alternator or wiring will also cause pressure drops. The 03-04 cobra are notorious for this. You need to verify that your pumps are seeing constant 13-13.5V. If you're seeing less than that at any point as the voltage drops so will fuel pressure. How the wiring was done- We recommend installing our wire harness by connecting the trigger wire to the green/yellow wire pre-FPDM. This will trigger the pumps to run full time and see a constant 13-13.5V once the key is turned to the on position. So whether you actually start the car or just turn the key on the pumps will have full voltage and run full time. There have been others on this forum who have chosen to trigger the relays with the POST FPDM wire. That works as well but needs to be tuned for. If not the signal to the relays will see variable voltage and will not provide a full constant 13-13.5V to the pumps. Tuners will typically tell the car to run 100% duty cycle when wiring their cars this way. Hope that helps. Jared [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Distillery
New e85 car voltage drop to 12v at 4500 rpm
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