porter_jamie Posted June 20, 2009 Report Share Posted June 20, 2009 maths n' stuff sensor A 1v=0 bar 5v=10bar sensor B 1V=0bar 5v=16bar both linear. if you use sensor B, but with sensor A settings in the readout, and get a reading of 5.5bar, how many bar do i really have. (i hope itro 3) havnt had much sleep and my head hurts, over to you answers with working please! J Link to comment Share on other sites More sharing options...
rerun Posted June 20, 2009 Report Share Posted June 20, 2009 I have bad english, but I would say more like 8,8bar? Link to comment Share on other sites More sharing options...
TriGGer Posted June 20, 2009 Report Share Posted June 20, 2009 If readout shows 5.5 bar calibrated for A then it is receiving 2.75v If sensor B is sending 2.75v then the pressure must be 8.8 bar This is because with A - 1v = 2 bar , hence 1 bar = 0.5v however B - 1v = 3.2 bar , hence 1 bar = 0.3125v So if the sensor displays 1bar for every 0.5v and its displaying 5.5bar it must be receiving 2.75v from sensor B. If sensor B is sending 2.75v it must be sensing 8.8bar. *maybe Link to comment Share on other sites More sharing options...
porter_jamie Posted June 20, 2009 Author Report Share Posted June 20, 2009 If readout shows 5.5 bar calibrated for A then it is receiving 2.75v If sensor B is sending 2.75v then the pressure must be 8.8 bar This is because with A - 1v = 2 bar , hence 1 bar = 0.5v however B - 1v = 3.2 bar , hence 1 bar = 0.3125v So if the sensor displays 1bar for every 0.5v and its displaying 5.5bar it must be receiving 2.75v from sensor B. If sensor B is sending 2.75v it must be sensing 8.8bar. *maybe anyone know what fuel pressure an er6 runs? (EDIT changed the fuel pump and fuel pressure reg for an ER6 pump/reg thing cos it's smaller.) i assumed it was 3 - it can't be 8 can it? it might explain why i had to take nearly 50% out of the map at the dyno though, running a new single injector (668cc@3bar) instead of twin 250cc@3bar trying to mackle up a pressure gauge to see what is going on. will put in the proper settings and see if it goes up to 8 bar - hope not!! Link to comment Share on other sites More sharing options...
TriGGer Posted June 20, 2009 Report Share Posted June 20, 2009 I assumed you meant 0v = 0bar and 5v = 10bar though. The calculations are different for 1v = 0bar and 5v = 10bar. ie 4v+- = 10bar hence 1v = 2.5bar So, 1bar = 0.4v for sensor A and 4v+- = 16bar hence 1v = 4bar So, 1bar = 0.25v If the readout shows 5.5bar and hence receives 2.2v then for B to send 2.2v it must be reading 8.8 Either way its 8.8 Link to comment Share on other sites More sharing options...
foo Posted June 20, 2009 Report Share Posted June 20, 2009 Sorry, fucked up the range of sensor A first time round. Bottom axis is volts, 1 to 5, left axis is bar 0-16. Hope this helps. edited for stupidity. Link to comment Share on other sites More sharing options...
porter_jamie Posted June 20, 2009 Author Report Share Posted June 20, 2009 Sorry, fucked up the range of sensor A first time round. Bottom axis is volts, 1 to 5, left axis is bar 0-16. Hope this helps. edited for stupidity. foo - cant see the piccy. not sure if it is a setting thing on my laptop? i'm just getting a stupid 'x' where the piccy should be Link to comment Share on other sites More sharing options...
foo Posted June 21, 2009 Report Share Posted June 21, 2009 foo - cant see the piccy. not sure if it is a setting thing on my laptop? i'm just getting a stupid 'x' where the piccy should be Seems OK from here. It's just a bog-standard .png file hosted on tinypic --unless tinypic had taken a shit when you were trying to look at it. I've just fired up Internet Exploder, and it works fine from there, as well as my normal Firefox. Sorry I can't be more help. Link to comment Share on other sites More sharing options...
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