bar to psi conversion and map sensor reference points
11-28-2005, 09:13 AM
#1
Honda-Tech Member
Thread Starter
bar to psi conversion and map sensor reference points
I am making this thread to clear up some misinformation. I just read the AEM3.5bar thread that got locked.
14.7psi = atmospheric pressure
0bar = 0psi
1bar = 14.50377psi
2bar = 29.00755psi
3bar = 43.51132psi
4bar = 58.01510psi
5bar = 72.51887psi
1kg/cm*2 = 14.22334psi (just for reference)
The reference point of a said map sensor is what will determine how much it will actually read. If 0bar = 0psi the sensor will read on a one to one scale but if vacuum to 0psi is referenced during the first bar.
1bar = 0psi
2bar = 14.50377psi
3bar = 29.00755psi
4bar = 43.51132psi
5bar = 58.01510psi
Some boosted cars have a map sensor that reads up to 0psi and the a boost sensor that reads from 0bar to 2bar actual.
If you want to remove the guess work from making conversion you should download the Josh Madison Converter program. You can also add a couple of your own conversions to the program.
14.7psi = atmospheric pressure
0bar = 0psi
1bar = 14.50377psi
2bar = 29.00755psi
3bar = 43.51132psi
4bar = 58.01510psi
5bar = 72.51887psi
1kg/cm*2 = 14.22334psi (just for reference)
The reference point of a said map sensor is what will determine how much it will actually read. If 0bar = 0psi the sensor will read on a one to one scale but if vacuum to 0psi is referenced during the first bar.
1bar = 0psi
2bar = 14.50377psi
3bar = 29.00755psi
4bar = 43.51132psi
5bar = 58.01510psi
Some boosted cars have a map sensor that reads up to 0psi and the a boost sensor that reads from 0bar to 2bar actual.
If you want to remove the guess work from making conversion you should download the Josh Madison Converter program. You can also add a couple of your own conversions to the program.
11-28-2005, 03:41 PM
#2
Honda-Tech Member
Join Date: Mar 2001
Location: Somewhere in California
Posts: 4,408
Likes: 0
Received 3 Likes
on
3 Posts
Re: bar to psi conversion and map sensor reference points (Dee)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dee »</TD></TR><TR><TD CLASS="quote">I am making this thread to clear up some misinformation.</TD></TR></TABLE>
Aside from the numbers you posted, the way you worded it kinda confused me. hehehe. If anybody else is as confused as me, what Dee is trying to explain is how to find out how much boost a MAP sensor is good for.
The way I do it is take the manufacturers MAP rating, subtract one, then multiply by 14.5. So say we are trying to figure out how much boost a 3 BAR map sensor is good for. You take 3 minus 1 equals 2...take 2 and multiply by 14.5 and you get 29psi, which is how much the 3 BAR MAP sensor is good for.
some more examples:
1.7 bar MAP sensor (stock Honda sensor): (1.7 - 1) * 14.5 = 10.15 psi
2.0 bar MAP sensor: (2 - 1) * 14.5 = 14.5 psi
2.5 bar MAP sensor: (2.5 - 1) * 14.5 = 21.75 psi
3.0 bar MAP sensor: (3 - 1) * 14.5 = 29 psi
3.5 bar MAP sensor: (3.5 - 1) * 14.5 = 36.25 psi
4.0 bar MAP sensor: (4 - 1) * 14.5 = 43.5 psi
5.0 bar MAP sensor: (5 - 1) * 14.5 = 58 psi
You guys get the idea...MAP sensor reference starts at absolute vacuum. Which is 14.7 psi or 29.92 in/hg <u>below</u> atmospheric pressure (atmospheric pressure being 0 psi). Technically I should have subtraced 1.01 which is 14.7 psi or 29.92 in/hg, but 1 is a lot easier to remember and the results are close enough anyways.
Aside from the numbers you posted, the way you worded it kinda confused me. hehehe. If anybody else is as confused as me, what Dee is trying to explain is how to find out how much boost a MAP sensor is good for.
The way I do it is take the manufacturers MAP rating, subtract one, then multiply by 14.5. So say we are trying to figure out how much boost a 3 BAR map sensor is good for. You take 3 minus 1 equals 2...take 2 and multiply by 14.5 and you get 29psi, which is how much the 3 BAR MAP sensor is good for.
some more examples:
1.7 bar MAP sensor (stock Honda sensor): (1.7 - 1) * 14.5 = 10.15 psi
2.0 bar MAP sensor: (2 - 1) * 14.5 = 14.5 psi
2.5 bar MAP sensor: (2.5 - 1) * 14.5 = 21.75 psi
3.0 bar MAP sensor: (3 - 1) * 14.5 = 29 psi
3.5 bar MAP sensor: (3.5 - 1) * 14.5 = 36.25 psi
4.0 bar MAP sensor: (4 - 1) * 14.5 = 43.5 psi
5.0 bar MAP sensor: (5 - 1) * 14.5 = 58 psi
You guys get the idea...MAP sensor reference starts at absolute vacuum. Which is 14.7 psi or 29.92 in/hg <u>below</u> atmospheric pressure (atmospheric pressure being 0 psi). Technically I should have subtraced 1.01 which is 14.7 psi or 29.92 in/hg, but 1 is a lot easier to remember and the results are close enough anyways.
Thread
Thread Starter
Forum
Replies
Last Post
asianspeed
Forced Induction
5
10-16-2008 04:34 AM
