1bar 2bar 3bar? whats it all mean?
12-02-2008, 09:14 PM
#2
there talking about your map sensor and the range in witch it can read. bar is a standard of measurement. a 1 bar reads vacum up to 0 psi. a 2 bar reads to almost 15 psi (14.4 I think) and a 3 bar reads up to 29 psi I believe. if you were doing a speed density tune you would need a 2 or 3 bar map sensor depending on how much boost your running.
12-02-2008, 10:22 PM
#7
I am far from a tuner but my tuner did it in a couple of hours. Thats because of the boost issues. But once we figured it out hell two pulls later numbers are in the sig. And the drivablity is awsome. Im not saying its just that easy but a dam good tuner can get it done. My Map is off a colbat ss. Nothing special hell I just pluged it in and attach the vac line (vic jr) and went on.
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12-02-2008, 10:26 PM
#8
its the rating of the amount of positive pressure the sensor can read, 1 bar is 14.5, so a 2 is 29, and 3 is 43.5 lbs/psi of pressure. you only need to be concerned if you are boosted, if not then you are going to only read vacuum anyway.
http://www.centauro-owners.com/articles/psibar.html
http://www.centauro-owners.com/articles/psibar.html
12-02-2008, 10:29 PM
#9
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I am far from a tuner but my tuner did it in a couple of hours. Thats because of the boost issues. But once we figured it out hell two pulls later numbers are in the sig. And the drivablity is awsome. Im not saying its just that easy but a dam good tuner can get it done. My Map is off a colbat ss. Nothing special hell I just pluged it in and attach the vac line (vic jr) and went on.
12-03-2008, 09:05 AM
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Atmospheric pressure is 1 bar (~14.7 psi). Naturally aspirated engines need a 1 bar MAP sensor to measure the pressure between full vacuum and normal atmospheric pressure. Even naturally aspirated, you need a MAP sensor that can measure within this range, in order to run speed density.
Boost is pressure above and beyond regular atmospheric. Example: 10 psi boost, as measured by the MAP sensor, is (10/14.7)+1, or roughly 1.68 bar. (Notice that you add 1 at the end of the equation to account for the regular atmospheric pressure.) A 2 bar MAP sensor would work in such an application, because the 1.68 bar reading @ 10 psi positive boost is within its range. (2 bar MAP can read from total vacuum to 14.7 psi positive "boost" pressure.)
Likewise, a 3 bar map can read from total vacuum to ~29.4 psi positive boost. 1st bar is vacuum to atmospheric, 2nd bar is atmospheric to 14.7psi positive "boost", 3rd bar is 14.7 psi positive "boost" to 29.4psi positive "boost".
MAP sensors measure the pressure and convert it to an electrical signal in volts. The software in your engine management MUST be calibrated to the MAP sensor you are using, in order to properly interpret the signal from the MAP sensor. (Example: a 3 bar MAP sensor would not work properly with tables configured for a 1 bar MAP.)
12-03-2008, 04:45 PM
#12
To clear up this misinformation:
Atmospheric pressure is 1 bar (~14.7 psi). Naturally aspirated engines need a 1 bar MAP sensor to measure the pressure between full vacuum and normal atmospheric pressure. Even naturally aspirated, you need a MAP sensor that can measure within this range, in order to run speed density.
Boost is pressure above and beyond regular atmospheric. Example: 10 psi boost, as measured by the MAP sensor, is (10/14.7)+1, or roughly 1.68 bar. (Notice that you add 1 at the end of the equation to account for the regular atmospheric pressure.) A 2 bar MAP sensor would work in such an application, because the 1.68 bar reading @ 10 psi positive boost is within its range. (2 bar MAP can read from total vacuum to 14.7 psi positive "boost" pressure.)
Likewise, a 3 bar map can read from total vacuum to ~29.4 psi positive boost. 1st bar is vacuum to atmospheric, 2nd bar is atmospheric to 14.7psi positive "boost", 3rd bar is 14.7 psi positive "boost" to 29.4psi positive "boost".
MAP sensors measure the pressure and convert it to an electrical signal in volts. The software in your engine management MUST be calibrated to the MAP sensor you are using, in order to properly interpret the signal from the MAP sensor. (Example: a 3 bar MAP sensor would not work properly with tables configured for a 1 bar MAP.)
Atmospheric pressure is 1 bar (~14.7 psi). Naturally aspirated engines need a 1 bar MAP sensor to measure the pressure between full vacuum and normal atmospheric pressure. Even naturally aspirated, you need a MAP sensor that can measure within this range, in order to run speed density.
Boost is pressure above and beyond regular atmospheric. Example: 10 psi boost, as measured by the MAP sensor, is (10/14.7)+1, or roughly 1.68 bar. (Notice that you add 1 at the end of the equation to account for the regular atmospheric pressure.) A 2 bar MAP sensor would work in such an application, because the 1.68 bar reading @ 10 psi positive boost is within its range. (2 bar MAP can read from total vacuum to 14.7 psi positive "boost" pressure.)
Likewise, a 3 bar map can read from total vacuum to ~29.4 psi positive boost. 1st bar is vacuum to atmospheric, 2nd bar is atmospheric to 14.7psi positive "boost", 3rd bar is 14.7 psi positive "boost" to 29.4psi positive "boost".
MAP sensors measure the pressure and convert it to an electrical signal in volts. The software in your engine management MUST be calibrated to the MAP sensor you are using, in order to properly interpret the signal from the MAP sensor. (Example: a 3 bar MAP sensor would not work properly with tables configured for a 1 bar MAP.)
