434josh Posted July 17, 2018 Report Share Posted July 17, 2018 Is there a way to slow down the rate at which the Extreme registers pressure from a sensor? I have a rail mounted fuel pressure sensor and the logged pressure is all over the place but my dash mounted gauge is steady. I think it's maybe registering actual pulses from the pump and the regulator because it's displaying too fast. Can I reduce the sample rate? When I say all over the place, I mean the kpa reading is 300, 305, 289, 315, etc in consecutive log lines. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 17, 2018 Report Share Posted July 17, 2018 No, there is no user definable damping on analog inputs. It needs to be instantaneous for the ECU to be able to adjust pulsewidth to compensate. Quote Link to comment Share on other sites More sharing options...
MagicMike Posted July 18, 2018 Report Share Posted July 18, 2018 Do you have a damper? Quote Link to comment Share on other sites More sharing options...
Kitto Posted July 18, 2018 Report Share Posted July 18, 2018 As above, if you don't have a fuel pulse damper, fit one and see if it fixes the erratic pressure. Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted July 18, 2018 Report Share Posted July 18, 2018 This is not a damper issue I fit FP Sensors to every install and don't think any of them have had dampers fitted and I don't see fluctuations like that, + - 10kpa maybe If your fuel req is vacuum referenced then I would log 'differential fuel pressure' instead and that should be steadier. Differential fuel pressure is a calculated value derived from both MAP and FP. Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 18, 2018 Report Share Posted July 18, 2018 Also, have a watch of Paul Yaw's seminar on this subject. It can be caused by a range of factors, such as "non-rubber" fuel lines etc, but quite often it is just resonance based. If it is particularly bad at certain RPM's you can often tune that out by changing the length of hose to the FRP reference port. https://www.youtube.com/watch?v=4QF5BmQtXZA&t=409s MagicMike 1 Quote Link to comment Share on other sites More sharing options...
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