birdmayne Posted March 5, 2018 Share Posted March 5, 2018 I noticed that my Prosport boost gauge and my BtSsm do not agree on boost / vacuum levels. The Prosport is tapped in to a line under the hood (installed by previous owner). While engine braking, Ssm data is around -12inHg, but the boost gauge is closer to -20inHg. Under light throttle, Ssm will be around -5inHg and boost gauge will be -10inHg. Peak boost is around 11psi on both, but they take different routes to get there. What should full vacuum be on these cars? Which do you trust more? My thought is the mechanical input of the boost gauge should be pretty accurate, but I'd like to think the ECU has a good idea of what's going on in there. John Hancock Link to comment Share on other sites More sharing options...
DaveWaters Posted March 5, 2018 Share Posted March 5, 2018 Most likely the btSsm is displaying -psi (like the Cobb AP does) not -inHg. I’m sure someone with BtSsm will chime in.. Link to comment Share on other sites More sharing options...
JmP6889928 Posted March 5, 2018 Share Posted March 5, 2018 My car runs at right between -20inHg and -21inHg at idle and then moves up as the car moves. Link to comment Share on other sites More sharing options...
Perscitus Posted March 5, 2018 Share Posted March 5, 2018 You can configure any unit you'd like in BtSsm but yes, the default params are NOT in terms of -inHg. Sift through the latest RomRaider logger def XML (v3.26 if I recall) and pull out the Manifold Absolute or Relative/Relative-Sea Pressure fields you need with the appropriate unit conversion formula, add those to your BtSsm profile - done. Link to comment Share on other sites More sharing options...
birdmayne Posted March 5, 2018 Author Share Posted March 5, 2018 You can configure any unit you'd like in BtSsm but yes, the default params are NOT in terms of -inHg. Sift through the latest RomRaider logger def XML (v3.26 if I recall) and pull out the Manifold Absolute or Relative/Relative-Sea Pressure fields you need with the appropriate unit conversion formula, add those to your BtSsm profile - done. 100% the answer I was hoping for. Thank you! John Hancock Link to comment Share on other sites More sharing options...
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