Warchild Posted November 10, 2016 Report Share Posted November 10, 2016 Me again .... again ...:)We bought two 150 psi sensors, one for the fuel pressure specially. It is installed and working 100%.Question: Where or how do we configure the link ecu that if fuel pressure drop below certain value to cut ignition ?Standard while idle, car is about 3 bar , and fuel line connect to boost, so if car boost 1 bar, fuel pressure will be 4 bar etc. Quote Link to comment Share on other sites More sharing options...
Steve Posted November 10, 2016 Report Share Posted November 10, 2016 Set up a gp limiter based on differential fuel pressure. Quote Link to comment Share on other sites More sharing options...
Scott Posted November 10, 2016 Report Share Posted November 10, 2016 PCLink Help gives an example of using a GP Limit table to control engine RPM based upon oil pressure. Have a read through of this and you'll see how something similar could be setup for fuel pressure.PCLink Help > G4+ ECU Tuning Functions > Engine Protection > GP RPM Limit The example is towards the bottom of the page.Scott Warchild 1 Quote Link to comment Share on other sites More sharing options...
Brad Burnett Posted November 10, 2016 Report Share Posted November 10, 2016 Warchild,If you use the modelled fuel equations and have the "Fuel System Type" set to "FP Sensor" then the ecu will automatically adjust fuel injector pulse width to compensate for falling fuel pressure. But adding an ignition cut or boost reduction via a GP limit for large fuel pressure drops would not be a bad idea. Brad Warchild 1 Quote Link to comment Share on other sites More sharing options...
CamB Posted November 10, 2016 Report Share Posted November 10, 2016 (edited) If you have an older model (ie a G4) with no modelled equation, would a 4D table be required to do this (edit - "this" meaning the compensation, as the GP limit functionality is the same)?From how I remember the relationship between fuel and pressure it would be a reduction in fuel by the square root of the increase pressure. Edited November 10, 2016 by CamB Quote Link to comment Share on other sites More sharing options...
Scott Posted November 10, 2016 Report Share Posted November 10, 2016 You could use a 4D table with an axis set to differential fuel pressure to change the fueling (adding more fuel for a drop in differential fuel pressure).Scott Quote Link to comment Share on other sites More sharing options...
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