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SVT Shelby GT500
Fuel Pressure Quandary
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<blockquote data-quote="SCGallo2" data-source="post: 16425662" data-attributes="member: 160791"><p>I have a theory that the Fuel Pressure PID you are monitoring and datalogging is Differential Fuel Pressure (pressure drop across the injectors). Differential Fuel Pressure = Actual Fuel Pressure – Relative Manifold Pressure (vacuum or boost in psi). Our setups are obviously different, but I believe our AeroForce gauges are reading the same PID due to similar model year. I have an OEM returnless fuel system with ID1000 fuel injectors for comparison. There may be a separate Fuel Rail Pressure PID or DMR in LiveLink that can be datalogged. I experimented with my car today to satisfy my curiosity. Here is what I found:</p><p></p><p>With Key On Engine Off, fuel rail pressure on the AutoMeter gauge matched the fuel pressure PID displayed on the AeroForce gauge at 42.3psi with zero manifold vacuum or boost: 42.3 psi – (0 psi) = 42.3 psi</p><p></p><p>[ATTACH=full]1642765[/ATTACH] </p><p></p><p>With Key On Engine On at idle, fuel rail pressure on the AutoMeter gauge was roughly 28 psi and the fuel pressure PID displayed on the AeroForce gauge was 39.1 psi with (-10.1 psi) manifold vacuum: 28 psi – (-10.1 psi) = 38.1 psi. I cannot account for the 1 psi error, total gauge/sensor tolerance maybe???</p><p></p><p>[ATTACH=full]1642766[/ATTACH]</p></blockquote><p></p>
[QUOTE="SCGallo2, post: 16425662, member: 160791"] I have a theory that the Fuel Pressure PID you are monitoring and datalogging is Differential Fuel Pressure (pressure drop across the injectors). Differential Fuel Pressure = Actual Fuel Pressure – Relative Manifold Pressure (vacuum or boost in psi). Our setups are obviously different, but I believe our AeroForce gauges are reading the same PID due to similar model year. I have an OEM returnless fuel system with ID1000 fuel injectors for comparison. There may be a separate Fuel Rail Pressure PID or DMR in LiveLink that can be datalogged. I experimented with my car today to satisfy my curiosity. Here is what I found: With Key On Engine Off, fuel rail pressure on the AutoMeter gauge matched the fuel pressure PID displayed on the AeroForce gauge at 42.3psi with zero manifold vacuum or boost: 42.3 psi – (0 psi) = 42.3 psi [ATTACH=full]1642765[/ATTACH] With Key On Engine On at idle, fuel rail pressure on the AutoMeter gauge was roughly 28 psi and the fuel pressure PID displayed on the AeroForce gauge was 39.1 psi with (-10.1 psi) manifold vacuum: 28 psi – (-10.1 psi) = 38.1 psi. I cannot account for the 1 psi error, total gauge/sensor tolerance maybe??? [ATTACH=full]1642766[/ATTACH] [/QUOTE]
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Fuel Pressure Quandary
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